Add ADC sub-system and drivers from Lzyy
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@3895 7fd9a85b-ad96-42d3-883c-3090e2eb8679
This commit is contained in:
patacongo
parent
449f1cb073
commit
a3c8259fe1
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@ -2007,4 +2007,5 @@
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* 8/18/2011: The basic port to the FreeScale Kinetics TWR-K60N512 board is
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now functional.
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* confgs/twr-k60n512: Add Kinetics TWR-K60N512 NSH configuration.
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* drivers/analog and include/nuttx/analog: Add ADC driver infrastructure
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and TI ADS1255 driver developed and submitted by Li Zhouy (Lzzy)).
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@ -48,6 +48,7 @@ VPATH = .
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# files to the source file list, add its DEPPATH info, and will add
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# the appropriate paths to the VPATH variable
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include analog/Make.defs
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include bch/Make.defs
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include input/Make.defs
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include lcd/Make.defs
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@ -0,0 +1,76 @@
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############################################################################
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# drivers/analog/Make.defs
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#
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# Copyright (C) 2011 Gregory Nutt. All rights reserved.
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# Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# 3. Neither the name NuttX nor the names of its contributors may be
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# used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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############################################################################
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# Don't build anything if there is no support for analog devices
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# Check for DAC devices
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ifeq ($(CONFIG_DAC),y)
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# Include the common ADC character driver
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# Include DAC device drivers
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endif
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# Check for ADC devices
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ifeq ($(CONFIG_ADC),y)
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# Include the common ADC character driver
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CSRCS += adc.c
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# Include ADC device drivers
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ifeq ($(CONFIG_ADC_ADS125X),y)
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CSRCS += ads1255.c
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endif
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endif
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# Add analog driver build support (the nested if-then-else implements an OR)
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ifeq ($(CONFIG_DAC),y)
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DEPPATH += --dep-path analog
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VPATH += :analog
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CFLAGS += ${shell $(TOPDIR)/tools/incdir.sh $(INCDIROPT) "$(CC)" $(TOPDIR)/drivers/analog}
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else
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ifeq ($(CONFIG_ADC),y)
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DEPPATH += --dep-path analog
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VPATH += :analog
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CFLAGS += ${shell $(TOPDIR)/tools/incdir.sh $(INCDIROPT) "$(CC)" $(TOPDIR)/drivers/analog}
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endif
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endif
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@ -0,0 +1,405 @@
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/****************************************************************************
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* drivers/adc/adc.c
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*
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* Copyright (C) 2011 Li Zhuoyi. All rights reserved.
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* Author: Li Zhuoyi <lzyy.cn@gmail.com>
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* History: 0.1 2011-08-04 initial version
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*
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* Derived from drivers/can.c
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*
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* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <string.h>
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#include <semaphore.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/fs.h>
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#include <nuttx/arch.h>
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#include <nuttx/analog/adc.h>
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#include <arch/irq.h>
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int adc_open(FAR struct file *filep);
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static int adc_close(FAR struct file *filep);
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static ssize_t adc_read(FAR struct file *, FAR char *, size_t);
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static ssize_t adc_write(FAR struct file *filep, FAR const char *buffer, size_t buflen);
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static int adc_ioctl(FAR struct file *filep,int cmd,unsigned long arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations adc_fops =
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{
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adc_open, /* open */
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adc_close, /* close */
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adc_read, /* read */
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adc_write, /* write */
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0, /* seek */
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adc_ioctl /* ioctl */
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#ifndef CONFIG_DISABLE_POLL
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, 0 /* poll */
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#endif
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/************************************************************************************
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* Name: adc_open
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*
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* Description:
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* This function is called whenever the ADC device is opened.
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*
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************************************************************************************/
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static int adc_open(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct adc_dev_s *dev = inode->i_private;
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uint8_t tmp;
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int ret = OK;
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/* If the port is the middle of closing, wait until the close is finished */
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if (sem_wait(&dev->cd_closesem) != OK)
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{
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ret = -errno;
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}
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else
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{
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/* Increment the count of references to the device. If this the first
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* time that the driver has been opened for this device, then initialize
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* the device.
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*/
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tmp = dev->cd_ocount + 1;
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if (tmp == 0)
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{
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/* More than 255 opens; uint8_t overflows to zero */
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ret = -EMFILE;
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}
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else
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{
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/* Check if this is the first time that the driver has been opened. */
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if (tmp == 1)
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{
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/* Yes.. perform one time hardware initialization. */
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irqstate_t flags = irqsave();
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ret = dev->cd_ops->ao_setup(dev);
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if (ret == OK)
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{
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/* Mark the FIFOs empty */
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dev->cd_recv.af_head = 0;
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dev->cd_recv.af_tail = 0;
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/* Finally, Enable the CAN RX interrupt */
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dev->cd_ops->ao_rxint(dev, true);
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/* Save the new open count on success */
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dev->cd_ocount = tmp;
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}
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irqrestore(flags);
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}
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}
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sem_post(&dev->cd_closesem);
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}
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return ret;
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}
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/************************************************************************************
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* Name: adc_close
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*
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* Description:
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* This routine is called when the ADC device is closed.
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* It waits for the last remaining data to be sent.
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*
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************************************************************************************/
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static int adc_close(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct adc_dev_s *dev = inode->i_private;
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irqstate_t flags;
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int ret = OK;
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if (sem_wait(&dev->cd_closesem) != OK)
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{
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ret = -errno;
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}
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else
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{
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/* Decrement the references to the driver. If the reference count will
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* decrement to 0, then uninitialize the driver.
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*/
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if (dev->cd_ocount > 1)
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{
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dev->cd_ocount--;
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sem_post(&dev->cd_closesem);
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}
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else
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{
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/* There are no more references to the port */
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dev->cd_ocount = 0;
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/* Free the IRQ and disable the ADC device */
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flags = irqsave(); /* Disable interrupts */
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dev->cd_ops->ao_shutdown(dev); /* Disable the ADC */
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irqrestore(flags);
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sem_post(&dev->cd_closesem);
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}
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}
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return ret;
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}
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/****************************************************************************
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* Name: adc_read
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****************************************************************************/
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static ssize_t adc_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct adc_dev_s *dev = inode->i_private;
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size_t nread;
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irqstate_t flags;
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int ret = 0;
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int msglen;
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if (buflen % 5 ==0 )
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msglen=5;
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else if (buflen % 4 ==0 )
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msglen=4;
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else if (buflen % 3 ==0 )
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msglen=3;
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else if (buflen % 2 ==0 )
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msglen=2;
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else if (buflen == 1)
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msglen=1;
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else
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msglen=5;
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if (buflen >= msglen)
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{
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/* Interrupts must be disabled while accessing the cd_recv FIFO */
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flags = irqsave();
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while (dev->cd_recv.af_head == dev->cd_recv.af_tail)
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{
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/* The receive FIFO is empty -- was non-blocking mode selected? */
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if (filep->f_oflags & O_NONBLOCK)
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{
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ret = -EAGAIN;
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goto return_with_irqdisabled;
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}
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/* Wait for a message to be received */
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dev->cd_nrxwaiters++;
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ret = sem_wait(&dev->cd_recv.af_sem);
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dev->cd_nrxwaiters--;
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if (ret < 0)
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{
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ret = -errno;
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goto return_with_irqdisabled;
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}
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}
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/* The cd_recv FIFO is not empty. Copy all buffered data that will fit
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* in the user buffer.
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*/
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nread = 0;
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do
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{
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FAR struct adc_msg_s *msg = &dev->cd_recv.af_buffer[dev->cd_recv.af_head];
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/* Will the next message in the FIFO fit into the user buffer? */
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if (ret + msglen > buflen)
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{
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break;
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}
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/* Copy the message to the user buffer */
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if (msglen==1)
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{
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buffer[nread]=msg->am_data>>24; //Only one channel,read highest 8bits
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}
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else if (msglen==2)
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{
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*(int16_t *)&buffer[nread]=msg->am_data>>16; //Only one channel,read highest 16bits
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}
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else if (msglen==3)
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{
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buffer[nread]=msg->am_channel;
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*(int16_t *)&buffer[nread+1]=msg->am_data>>16; //read channel highest 16bits
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}
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else if (msglen==4)
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{
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*(int32_t *)&buffer[nread]=msg->am_data; //read channel highest 24bits
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buffer[nread]=msg->am_channel;
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}
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else
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{
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*(int32_t *)&buffer[nread+1]=msg->am_data; //read all
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buffer[nread]=msg->am_channel;
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}
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nread += msglen;
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/* Increment the head of the circular message buffer */
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if (++dev->cd_recv.af_head >= CONFIG_ADC_FIFOSIZE)
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{
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dev->cd_recv.af_head = 0;
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}
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}
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while (dev->cd_recv.af_head != dev->cd_recv.af_tail);
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/* All on the messages have bee transferred. Return the number of bytes
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* that were read.
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*/
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ret = nread;
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return_with_irqdisabled:
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irqrestore(flags);
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}
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return ret;
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}
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/************************************************************************************
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* Name: adc_write
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************************************************************************************/
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static ssize_t adc_write(FAR struct file *filep, FAR const char *buffer, size_t buflen)
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{
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return 0;
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}
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/************************************************************************************
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* Name: adc_ioctl
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************************************************************************************/
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static int adc_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct adc_dev_s *dev = inode->i_private;
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int ret = OK;
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ret = dev->cd_ops->ao_ioctl(dev, cmd, arg);
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int adc_receive(FAR struct adc_dev_s *dev, uint8_t ch, int32_t data)
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{
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FAR struct adc_fifo_s *fifo = &dev->cd_recv;
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int nexttail;
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int err = -ENOMEM;
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/* Check if adding this new message would over-run the drivers ability to enqueue
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* read data.
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*/
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nexttail = fifo->af_tail + 1;
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if (nexttail >= CONFIG_ADC_FIFOSIZE)
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{
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nexttail = 0;
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}
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/* Refuse the new data if the FIFO is full */
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if (nexttail != fifo->af_head)
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{
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/* Add the new, decoded CAN message at the tail of the FIFO */
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fifo->af_buffer[fifo->af_tail].am_channel = ch;
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fifo->af_buffer[fifo->af_tail].am_data=data;
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/* Increment the tail of the circular buffer */
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fifo->af_tail = nexttail;
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if( dev->cd_nrxwaiters>0)
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sem_post(&fifo->af_sem);
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err = OK;
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}
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return err;
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}
|
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int adc_register(FAR const char *path, FAR struct adc_dev_s *dev)
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{
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/* Initialize the ADC device structure */
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dev->cd_ocount = 0;
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sem_init(&dev->cd_recv.af_sem, 0, 0);
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sem_init(&dev->cd_closesem, 0, 1);
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dev->cd_ops->ao_reset(dev);
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return register_driver(path, &adc_fops, 0444, dev);
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}
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|
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|
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@ -0,0 +1,334 @@
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/************************************************************************************
|
||||
* arch/drivers/adc/ads1255.c
|
||||
*
|
||||
* Copyright (C) 2011 Li Zhuoyi. All rights reserved.
|
||||
* Author: Li Zhuoyi <lzyy.cn@gmail.com>
|
||||
* History: 0.1 2011-08-05 initial version
|
||||
*
|
||||
* This file is a part of NuttX:
|
||||
*
|
||||
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
************************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
|
||||
#include <stdio.h>
|
||||
#include <sys/types.h>
|
||||
#include <stdint.h>
|
||||
#include <stdbool.h>
|
||||
#include <semaphore.h>
|
||||
#include <errno.h>
|
||||
#include <debug.h>
|
||||
|
||||
#include <arch/board/board.h>
|
||||
#include <nuttx/arch.h>
|
||||
#include <nuttx/spi.h>
|
||||
#include <nuttx/analog/adc.h>
|
||||
|
||||
#if defined(CONFIG_ADC_ADS1255)
|
||||
|
||||
#define ADS125X_BUFON 0x02
|
||||
#define ADS125X_BUFOFF 0x00
|
||||
|
||||
#define ADS125X_PGA1 0x00
|
||||
#define ADS125X_PGA2 0x01
|
||||
#define ADS125X_PGA4 0x02
|
||||
#define ADS125X_PGA8 0x03
|
||||
#define ADS125X_PGA16 0x04
|
||||
#define ADS125X_PGA32 0x05
|
||||
#define ADS125X_PGA64 0x06
|
||||
|
||||
#define ADS125X_RDATA 0x01 //Read Data
|
||||
#define ADS125X_RDATAC 0x03 //Read Data Continuously
|
||||
#define ADS125X_SDATAC 0x0F //Stop Read Data Continuously
|
||||
#define ADS125X_RREG 0x10 //Read from REG
|
||||
#define ADS125X_WREG 0x50 //Write to REG
|
||||
#define ADS125X_SELFCAL 0xF0 //Offset and Gain Self-Calibration
|
||||
#define ADS125X_SELFOCAL 0xF1 //Offset Self-Calibration
|
||||
#define ADS125X_SELFGCAL 0xF2 //Gain Self-Calibration
|
||||
#define ADS125X_SYSOCAL 0xF3 //System Offset Calibration
|
||||
#define ADS125X_SYSGCAL 0xF4 //System Gain Calibration
|
||||
#define ADS125X_SYNC 0xFC //Synchronize the A/D Conversion
|
||||
#define ADS125X_STANDBY 0xFD //Begin Standby Mode
|
||||
#define ADS125X_RESET 0xFE //Reset to Power-Up Values
|
||||
#define ADS125X_WAKEUP 0xFF //Completes SYNC and Exits Standby Mode
|
||||
|
||||
#ifndef CONFIG_ADS1255_FREQUENCY
|
||||
#define CONFIG_ADS1255_FREQUENCY 1000000
|
||||
#endif
|
||||
#ifndef CONFIG_ADS1255_MUX
|
||||
#define CONFIG_ADS1255_MUX 0x01
|
||||
#endif
|
||||
#ifndef CONFIG_ADS1255_CHMODE
|
||||
#define CONFIG_ADS1255_CHMODE 0x00
|
||||
#endif
|
||||
#ifndef CONFIG_ADS1255_BUFON
|
||||
#define CONFIG_ADS1255_BUFON 1
|
||||
#endif
|
||||
#ifndef CONFIG_ADS1255_PGA
|
||||
#define CONFIG_ADS1255_PGA ADS125X_PGA2
|
||||
#endif
|
||||
#ifndef CONFIG_ADS1255_SPS
|
||||
#define CONFIG_ADS1255_SPS 50
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* cd_private Types
|
||||
****************************************************************************/
|
||||
|
||||
struct up_dev_s
|
||||
{
|
||||
uint8_t channel;
|
||||
uint8_t sps;
|
||||
uint8_t pga;
|
||||
uint8_t buf;
|
||||
const uint8_t *mux;
|
||||
int irq;
|
||||
int devno;
|
||||
FAR struct spi_dev_s *spi; /* Cached SPI device reference */
|
||||
};
|
||||
|
||||
/****************************************************************************
|
||||
* cd_private Function Prototypes
|
||||
****************************************************************************/
|
||||
|
||||
/* ADC methods */
|
||||
|
||||
static void adc_reset(FAR struct adc_dev_s *dev);
|
||||
static int adc_setup(FAR struct adc_dev_s *dev);
|
||||
static void adc_shutdown(FAR struct adc_dev_s *dev);
|
||||
static void adc_rxint(FAR struct adc_dev_s *dev, bool enable);
|
||||
static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg);
|
||||
static int adc_interrupt(int irq, void *context);
|
||||
|
||||
/****************************************************************************
|
||||
* cd_private Data
|
||||
****************************************************************************/
|
||||
|
||||
static const struct adc_ops_s g_adcops =
|
||||
{
|
||||
adc_reset, /* ao_reset */
|
||||
adc_setup, /* ao_setup */
|
||||
adc_shutdown, /* ao_shutdown */
|
||||
adc_rxint, /* ao_rxint */
|
||||
adc_ioctl /* ao_read */
|
||||
};
|
||||
|
||||
static struct up_dev_s g_adcpriv =
|
||||
{
|
||||
.mux = (const uint8_t [])
|
||||
{
|
||||
CONFIG_ADS1255_MUX,0
|
||||
},
|
||||
.sps = CONFIG_ADS1255_SPS,
|
||||
.channel = 0,
|
||||
.irq = CONFIG_ADS1255_IRQ,
|
||||
};
|
||||
|
||||
static struct adc_dev_s g_adcdev =
|
||||
{
|
||||
.cd_ops = &g_adcops,
|
||||
.cd_priv= &g_adcpriv,
|
||||
};
|
||||
|
||||
/****************************************************************************
|
||||
* Private Functions
|
||||
****************************************************************************/
|
||||
|
||||
static uint8_t getspsreg(uint16_t sps)
|
||||
{
|
||||
static const unsigned short sps_tab[]=
|
||||
{
|
||||
3,7,12,20,27,40,55,80,300,750,1500,3000,5000,10000,20000,65535,
|
||||
};
|
||||
static const unsigned char sps_reg[]=
|
||||
{
|
||||
0x03,0x13,0x23,0x33,0x43,0x53,0x63,0x72,0x82,0x92,0xa1,0xb0,0xc0,0xd0,0xe0,0xf0,
|
||||
};
|
||||
int i;
|
||||
for (i=0; i<16; i++)
|
||||
{
|
||||
if (sps<sps_tab[i])
|
||||
break;
|
||||
}
|
||||
return sps_reg[i];
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* cd_private Functions
|
||||
****************************************************************************/
|
||||
/* Reset the ADC device. Called early to initialize the hardware. This
|
||||
* is called, before ao_setup() and on error conditions.
|
||||
*/
|
||||
|
||||
static void adc_reset(FAR struct adc_dev_s *dev)
|
||||
{
|
||||
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->cd_priv;
|
||||
FAR struct spi_dev_s *spi = priv->spi;
|
||||
|
||||
SPI_SETMODE(spi, SPIDEV_MODE1);
|
||||
SPI_SETBITS(spi, 8);
|
||||
SPI_SETFREQUENCY(spi, CONFIG_ADS1255_FREQUENCY);
|
||||
usleep(1000);
|
||||
SPI_SELECT(spi, priv->devno, true);
|
||||
SPI_SEND(spi,ADS125X_WREG+0x03); //WRITE SPS REG
|
||||
SPI_SEND(spi,0x00); //count=1
|
||||
SPI_SEND(spi,0x63);
|
||||
SPI_SELECT(spi, priv->devno, false);
|
||||
}
|
||||
|
||||
/* Configure the ADC. This method is called the first time that the ADC
|
||||
* device is opened. This will occur when the port is first opened.
|
||||
* This setup includes configuring and attaching ADC interrupts. Interrupts
|
||||
* are all disabled upon return.
|
||||
*/
|
||||
|
||||
static int adc_setup(FAR struct adc_dev_s *dev)
|
||||
{
|
||||
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->cd_priv;
|
||||
FAR struct spi_dev_s *spi = priv->spi;
|
||||
int ret = irq_attach(priv->irq, adc_interrupt);
|
||||
if (ret == OK)
|
||||
{
|
||||
SPI_SELECT(spi, priv->devno, true);
|
||||
SPI_SEND(spi,ADS125X_WREG); //WRITE REG from 0
|
||||
SPI_SEND(spi,0x03); //count=4+1
|
||||
if (priv->buf)
|
||||
SPI_SEND(spi,ADS125X_BUFON); //REG0 STATUS BUFFER ON
|
||||
else
|
||||
SPI_SEND(spi,ADS125X_BUFOFF);
|
||||
SPI_SEND(spi,priv->mux[0]);
|
||||
SPI_SEND(spi,priv->pga); //REG2 ADCON PGA=2
|
||||
SPI_SEND(spi,getspsreg(priv->sps));
|
||||
usleep(1000);
|
||||
SPI_SEND(spi,ADS125X_SELFCAL);
|
||||
SPI_SELECT(spi, priv->devno, false);
|
||||
up_enable_irq(priv->irq);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Disable the ADC. This method is called when the ADC device is closed.
|
||||
* This method reverses the operation the setup method.
|
||||
*/
|
||||
|
||||
static void adc_shutdown(FAR struct adc_dev_s *dev)
|
||||
{
|
||||
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->cd_priv;
|
||||
up_disable_irq(priv->irq);
|
||||
irq_detach(priv->irq);
|
||||
}
|
||||
|
||||
/* Call to enable or disable RX interrupts */
|
||||
|
||||
static void adc_rxint(FAR struct adc_dev_s *dev, bool enable)
|
||||
{
|
||||
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->cd_priv;
|
||||
if (enable)
|
||||
up_enable_irq(priv->irq);
|
||||
else
|
||||
up_disable_irq(priv->irq);
|
||||
}
|
||||
|
||||
/* All ioctl calls will be routed through this method */
|
||||
|
||||
static int adc_ioctl(FAR struct adc_dev_s *dev, int cmd, unsigned long arg)
|
||||
{
|
||||
dbg("Fix me:Not Implemented\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int adc_interrupt(int irq, void *context)
|
||||
{
|
||||
uint32_t regval;
|
||||
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)g_adcdev.cd_priv;
|
||||
FAR struct spi_dev_s *spi = priv->spi;
|
||||
unsigned char buf[4];
|
||||
unsigned char ch;
|
||||
|
||||
SPI_SELECT(spi, priv->devno, true);
|
||||
SPI_SEND(spi,ADS125X_RDATA);
|
||||
up_udelay(10);
|
||||
buf[3]=SPI_SEND(spi,0xff);
|
||||
buf[2]=SPI_SEND(spi,0xff);
|
||||
buf[1]=SPI_SEND(spi,0xff);
|
||||
buf[0]=0;
|
||||
|
||||
priv->channel++;
|
||||
ch = priv->mux[priv->channel];
|
||||
if ( ch == 0 )
|
||||
{
|
||||
priv->channel=0;
|
||||
ch = priv->mux[0];
|
||||
}
|
||||
|
||||
SPI_SEND(spi,ADS125X_WREG+0x01);
|
||||
SPI_SEND(spi,0x00);
|
||||
SPI_SEND(spi,ch);
|
||||
SPI_SEND(spi,ADS125X_SYNC);
|
||||
up_udelay(2);
|
||||
SPI_SEND(spi,ADS125X_WAKEUP);
|
||||
SPI_SELECT(spi, priv->devno, false);
|
||||
|
||||
adc_receive(&g_adcdev,priv->channel,*(int32_t *)buf);
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: up_ads1255initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize the selected adc port
|
||||
*
|
||||
* Input Parameter:
|
||||
* Port number (for hardware that has mutiple adc interfaces)
|
||||
*
|
||||
* Returned Value:
|
||||
* Valid can device structure reference on succcess; a NULL on failure
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct adc_dev_s *up_ads1255initialize(FAR struct spi_dev_s *spi, unsigned int devno)
|
||||
{
|
||||
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)g_adcdev.cd_priv;
|
||||
|
||||
/* Driver state data */
|
||||
|
||||
priv->spi = spi;
|
||||
priv->devno = devno;
|
||||
return &g_adcdev;
|
||||
}
|
||||
#endif
|
||||
|
||||
|
|
@ -0,0 +1,188 @@
|
|||
/************************************************************************************
|
||||
* include/nuttx/analog/adc.h
|
||||
*
|
||||
* Copyright (C) 2011 Li Zhuoyi. All rights reserved.
|
||||
* Author: Li Zhuoyi <lzyy.cn@gmail.com>
|
||||
* History: 0.1 2011-08-04 initial version
|
||||
*
|
||||
* Derived from include/nuttx/can.h
|
||||
* Copyright (C) 2008, 2009 Gregory Nutt. All rights reserved.
|
||||
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
* 3. Neither the name NuttX nor the names of its contributors may be
|
||||
* used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
************************************************************************************/
|
||||
|
||||
#ifndef __INCLUDE_NUTTX_ANALOG_ADC_H
|
||||
#define __INCLUDE_NUTTX_ANALOG_ADC_H
|
||||
|
||||
/************************************************************************************
|
||||
* Included Files
|
||||
************************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <stdint.h>
|
||||
#include <stdbool.h>
|
||||
#include <semaphore.h>
|
||||
#include <nuttx/fs.h>
|
||||
#include <nuttx/spi.h>
|
||||
|
||||
/************************************************************************************
|
||||
* Pre-processor Definitions
|
||||
************************************************************************************/
|
||||
|
||||
/* Default configuration settings that may be overridden in the board configuration.
|
||||
* file. The configured size is limited to 255 to fit into a uint8_t.
|
||||
*/
|
||||
|
||||
#if !defined(CONFIG_ADC_FIFOSIZE)
|
||||
# define CONFIG_ADC_FIFOSIZE 8
|
||||
#elif CONFIG_ADC_FIFOSIZE > 255
|
||||
# undef CONFIG_ADC_FIFOSIZE
|
||||
# define CONFIG_ADC_FIFOSIZE 255
|
||||
#endif
|
||||
|
||||
/************************************************************************************
|
||||
* Public Types
|
||||
************************************************************************************/
|
||||
struct adc_msg_s
|
||||
{
|
||||
uint8_t am_channel; /* The 8-bit ADC Channel */
|
||||
int32_t am_data; /* ADC convert result (4 bytes) */
|
||||
}__attribute__((__packed__));
|
||||
|
||||
struct adc_fifo_s
|
||||
{
|
||||
sem_t af_sem; /* Counting semaphore */
|
||||
uint8_t af_head; /* Index to the head [IN] index in the circular buffer */
|
||||
uint8_t af_tail; /* Index to the tail [OUT] index in the circular buffer */
|
||||
/* Circular buffer of CAN messages */
|
||||
struct adc_msg_s af_buffer[CONFIG_ADC_FIFOSIZE];
|
||||
};
|
||||
|
||||
/* This structure defines all of the operations providd by the architecture specific
|
||||
* logic. All fields must be provided with non-NULL function pointers by the
|
||||
* caller of can_register().
|
||||
*/
|
||||
|
||||
struct adc_dev_s;
|
||||
struct adc_ops_s
|
||||
{
|
||||
/* Reset the ADC device. Called early to initialize the hardware. This
|
||||
* is called, before ao_setup() and on error conditions.
|
||||
*/
|
||||
|
||||
CODE void (*ao_reset)(FAR struct adc_dev_s *dev);
|
||||
|
||||
/* Configure the ADC. This method is called the first time that the ADC
|
||||
* device is opened. This will occur when the port is first opened.
|
||||
* This setup includes configuring and attaching ADC interrupts. Interrupts
|
||||
* are all disabled upon return.
|
||||
*/
|
||||
|
||||
CODE int (*ao_setup)(FAR struct adc_dev_s *dev);
|
||||
|
||||
/* Disable the ADC. This method is called when the ADC device is closed.
|
||||
* This method reverses the operation the setup method.
|
||||
*/
|
||||
|
||||
CODE void (*ao_shutdown)(FAR struct adc_dev_s *dev);
|
||||
|
||||
/* Call to enable or disable RX interrupts */
|
||||
|
||||
CODE void (*ao_rxint)(FAR struct adc_dev_s *dev, bool enable);
|
||||
|
||||
CODE int (*ao_read)(FAR struct adc_dev_s *dev, char *buffer,int len);
|
||||
|
||||
/* All ioctl calls will be routed through this method */
|
||||
|
||||
CODE int (*ao_ioctl)(FAR struct adc_dev_s *dev, int cmd, unsigned long arg);
|
||||
|
||||
};
|
||||
|
||||
/* This is the device structure used by the driver. The caller of
|
||||
* can_register() must allocate and initialize this structure. The
|
||||
* calling logic need only set all fields to zero except:
|
||||
*
|
||||
* The elements of 'cd_ops', and 'cd_priv'
|
||||
*
|
||||
* The common logic will initialize all semaphores.
|
||||
*/
|
||||
|
||||
struct adc_dev_s
|
||||
{
|
||||
uint8_t cd_ocount; /* The number of times the device has been opened */
|
||||
uint8_t cd_nrxwaiters; /* Number of threads waiting to enqueue a message */
|
||||
sem_t cd_closesem; /* Locks out new opens while close is in progress */
|
||||
sem_t cd_recvsem; /* Used to wakeup user waiting for space in cd_recv.buffer */
|
||||
struct adc_fifo_s cd_recv; /* Describes receive FIFO */
|
||||
const struct adc_ops_s *cd_ops; /* Arch-specific operations */
|
||||
void *cd_priv; /* Used by the arch-specific logic */
|
||||
};
|
||||
|
||||
/************************************************************************************
|
||||
* Public Data
|
||||
************************************************************************************/
|
||||
|
||||
/************************************************************************************
|
||||
* Public Functions
|
||||
************************************************************************************/
|
||||
|
||||
#if defined(__cplusplus)
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
/************************************************************************************
|
||||
* Name: adc_register
|
||||
*
|
||||
* Description:
|
||||
* Register a adc driver.
|
||||
*
|
||||
************************************************************************************/
|
||||
|
||||
int adc_register(FAR const char *path, FAR struct adc_dev_s *dev);
|
||||
|
||||
int adc_receive(FAR struct adc_dev_s *dev, uint8_t ch, int32_t data);
|
||||
|
||||
/************************************************************************************
|
||||
* Name: up_ads1255initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize the TI ADS 125X lower half driver
|
||||
*
|
||||
************************************************************************************/
|
||||
|
||||
FAR struct adc_dev_s *up_ads1255initialize(FAR struct spi_dev_s *spi, unsigned int devno);
|
||||
|
||||
#if defined(__cplusplus)
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* __INCLUDE_NUTTX_ANALOG_ADC_H */
|
||||
Loading…
Reference in New Issue