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nuttx-bb/nuttx/arch/arm/src/lpc43xx/lpc43_adc.c

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/************************************************************************************
* arch/arm/src/lpc43xx/lpc43_adc.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Ported from from the LPC17 version:
*
* 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) 2010-2012 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.
*
************************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#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/analog/adc.h>
#include "up_internal.h"
#include "up_arch.h"
#include "chip.h"
#include "lpc43_internal.h"
#include "lpc43_syscon.h"
#include "lpc43_pinconn.h"
#include "lpc43_adc.h"
#if defined(CONFIG_LPC43_ADC)
#ifndef CONFIG_ADC0_MASK
#define CONFIG_ADC0_MASK 0x01
#endif
#ifndef CONFIG_ADC0_SPS
#define CONFIG_ADC0_SPS 1000
#endif
#ifndef CONFIG_ADC0_AVERAGE
#define CONFIG_ADC0_AVERAGE 200
#endif
/****************************************************************************
* Private Types
****************************************************************************/
struct up_dev_s
{
uint8_t mask;
uint32_t sps;
int irq;
int32_t buf[8];
uint8_t count[8];
};
/****************************************************************************
* 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);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct adc_ops_s g_adcops =
{
.ao_reset =adc_reset,
.ao_setup = adc_setup,
.ao_shutdown = adc_shutdown,
.ao_rxint = adc_rxint,
.ao_ioctl = adc_ioctl,
};
static struct up_dev_s g_adcpriv =
{
.sps = CONFIG_ADC0_SPS,
.mask = CONFIG_ADC0_MASK,
.irq = LPC43_IRQ_ADC,
};
static struct adc_dev_s g_adcdev =
{
.ad_ops = &g_adcops,
.ad_priv= &g_adcpriv,
};
/****************************************************************************
* 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)
{
irqstate_t flags;
uint32_t regval;
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->ad_priv;
flags = irqsave();
regval = getreg32(LPC43_SYSCON_PCONP);
regval |= SYSCON_PCONP_PCADC;
putreg32(regval, LPC43_SYSCON_PCONP);
putreg32(ADC_CR_PDN,LPC43_ADC_CR);
regval = getreg32(LPC43_SYSCON_PCLKSEL0);
regval &= ~SYSCON_PCLKSEL0_ADC_MASK;
regval |= (SYSCON_PCLKSEL_CCLK8 << SYSCON_PCLKSEL0_ADC_SHIFT);
putreg32(regval, LPC43_SYSCON_PCLKSEL0);
uint32_t clkdiv=LPC43_CCLK/8/65/priv->sps;
clkdiv<<=8;
clkdiv&=0xff00;
putreg32(ADC_CR_PDN|ADC_CR_BURST|clkdiv|priv->mask,LPC43_ADC_CR);
if(priv->mask&0x01)
lpc43_configgpio(GPIO_AD0p0);
else if(priv->mask&0x02)
lpc43_configgpio(GPIO_AD0p1);
else if(priv->mask&0x04)
lpc43_configgpio(GPIO_AD0p2);
else if(priv->mask&0x08)
lpc43_configgpio(GPIO_AD0p3);
else if(priv->mask&0x10)
lpc43_configgpio(GPIO_AD0p4);
else if(priv->mask&0x20)
lpc43_configgpio(GPIO_AD0p5);
else if(priv->mask&0x40)
lpc43_configgpio(GPIO_AD0p6);
else if(priv->mask&0x80)
lpc43_configgpio(GPIO_AD0p7);
irqrestore(flags);
}
/* 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)
{
int i;
FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->ad_priv;
int ret = irq_attach(priv->irq, adc_interrupt);
if (ret == OK)
{
for (i = 0; i < 8; i++)
{
priv->buf[i]=0;
priv->count[i]=0;
}
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->ad_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->ad_priv;
if (enable)
putreg32(ADC_INTEN_GLOBAL, LPC43_ADC_INTEN);
else
putreg32(0x00, LPC43_ADC_INTEN);
}
/* 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.ad_priv;
unsigned char ch;
int32_t value;
regval = getreg32(LPC43_ADC_GDR);
ch = (regval >> 24) & 0x07;
priv->buf[ch] += regval & 0xfff0;
priv->count[ch]++;
if (priv->count[ch] >= CONFIG_ADC0_AVERAGE)
{
value = priv->buf[ch] / priv->count[ch];
value <<= 15;
adc_receive(&g_adcdev,ch,value);
priv->buf[ch] = 0;
priv->count[ch] = 0;
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: stm32_adcinitialize
*
* Description:
* Initialize the adc
*
* Returned Value:
* Valid can device structure reference on succcess; a NULL on failure
*
****************************************************************************/
FAR struct adc_dev_s *lpc43_adcinitialize(void)
{
return &g_adcdev;
}
#endif
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