172 lines
6.9 KiB
C
172 lines
6.9 KiB
C
/********************************************************************************************
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* drivers/input/ads7843e.h
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*
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* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* References:
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* "Touch Screen Controller, ADS7843," Burr-Brown Products from Texas
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* Instruments, SBAS090B, September 2000, Revised May 2002"
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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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#ifndef __DRIVERS_INPUT_ADS7843E_H
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#define __DRIVERS_INPUT_ADS7843E_H
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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 <stdint.h>
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#include <semaphore.h>
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#include <poll.h>
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#include <wdog.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/spi.h>
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#include <nuttx/clock.h>
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#include <nuttx/input/ads7843e.h>
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/********************************************************************************************
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* Pre-Processor Definitions
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********************************************************************************************/
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/* Configuration ****************************************************************************/
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/* Reference counting is partially implemented, but not needed in the current design. */
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#undef CONFIG_ADS7843E_REFCNT
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/* ADS7843E Interfaces *********************************************************************/
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/* ADS7843E command bit settings */
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#define ADS7843E_CMD_PD0 (1 << 0) /* PD0 */
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#define ADS7843E_CMD_PD1 (1 << 1) /* PD1 */
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#define ADS7843E_CMD_DFR (1 << 2) /* SER/DFR */
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#define ADS7843E_CMD_EIGHT_BITS_MOD (1 << 3) /* Mode */
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#define ADS7843E_CMD_START (1 << 7) /* Start Bit */
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#define ADS7843E_CMD_SWITCH_SHIFT 4 /* Address setting */
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/* ADS7843E Commands */
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#define ADS7843_CMD_YPOSITION \
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((1 << ADS7843E_CMD_SWITCH_SHIFT)|ADS7843E_CMD_START|ADS7843E_CMD_PD0|ADS7843E_CMD_PD1)
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#define ADS7843_CMD_XPOSITION \
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((5 << ADS7843E_CMD_SWITCH_SHIFT)|ADS7843E_CMD_START|ADS7843E_CMD_PD0|ADS7843E_CMD_PD1)
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#define ADS7843_CMD_ENABPINIRQ \
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((1 << ADS7843E_CMD_SWITCH_SHIFT)|ADS7843E_CMD_START)
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/* Driver support **************************************************************************/
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/* This format is used to construct the /dev/input[n] device driver path. It
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* defined here so that it will be used consistently in all places.
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*/
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#define DEV_FORMAT "/dev/input%d"
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#define DEV_NAMELEN 16
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/* Poll the pen position while the pen is down at this rate (50MS): */
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#define ADS7843E_WDOG_DELAY ((50 + (MSEC_PER_TICK-1))/ MSEC_PER_TICK)
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/********************************************************************************************
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* Public Types
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********************************************************************************************/
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/* This describes the state of one contact */
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enum ads7843e_contact_3
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{
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CONTACT_NONE = 0, /* No contact */
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CONTACT_DOWN, /* First contact */
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CONTACT_MOVE, /* Same contact, possibly different position */
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CONTACT_UP, /* Contact lost */
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};
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/* This structure describes the results of one ADS7843E sample */
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struct ads7843e_sample_s
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{
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uint8_t id; /* Sampled touch point ID */
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uint8_t contact; /* Contact state (see enum ads7843e_contact_e) */
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bool valid; /* True: x,y contain valid, sampled data */
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uint16_t x; /* Measured X position */
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uint16_t y; /* Measured Y position */
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};
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/* This structure describes the state of one ADS7843E driver instance */
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struct ads7843e_dev_s
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{
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#ifdef CONFIG_ADS7843E_MULTIPLE
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FAR struct ads7843e_dev_s *flink; /* Supports a singly linked list of drivers */
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#endif
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#ifdef CONFIG_ADS7843E_REFCNT
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uint8_t crefs; /* Number of times the device has been opened */
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#endif
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uint8_t nwaiters; /* Number of threads waiting for ADS7843E data */
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uint8_t id; /* Current touch point ID */
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volatile bool penchange; /* An unreported event is buffered */
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sem_t devsem; /* Manages exclusive access to this structure */
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sem_t waitsem; /* Used to wait for the availability of data */
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FAR struct ads7843e_config_s *config; /* Board configuration data */
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FAR struct spi_dev_s *spi; /* Saved SPI driver instance */
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struct work_s work; /* Supports the interrupt handling "bottom half" */
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struct ads7843e_sample_s sample; /* Last sampled touch point data */
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WDOG_ID wdog; /* Poll the position while the pen is down */
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/* The following is a list if poll structures of threads waiting for
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* driver events. The 'struct pollfd' reference for each open is also
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* retained in the f_priv field of the 'struct file'.
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*/
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#ifndef CONFIG_DISABLE_POLL
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struct pollfd *fds[CONFIG_ADS7843E_NPOLLWAITERS];
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#endif
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};
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/********************************************************************************************
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* Public Function Prototypes
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********************************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C" {
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#else
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#define EXTERN extern
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __DRIVERS_INPUT_ADS7843E_H */
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