181 lines
7.5 KiB
C
181 lines
7.5 KiB
C
/********************************************************************************************
|
|
* drivers/input/ads7843e.h
|
|
*
|
|
* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* References:
|
|
* "Touch Screen Controller, ADS7843," Burr-Brown Products from Texas
|
|
* Instruments, SBAS090B, September 2000, Revised May 2002"
|
|
*
|
|
* See also:
|
|
* "Low Voltage I/O Touch Screen Controller, TSC2046," Burr-Brown Products
|
|
* from Texas Instruments, SBAS265F, October 2002, Revised August 2007."
|
|
*
|
|
* "XPT2046 Data Sheet," Shenzhen XPTek Technology Co., Ltd, 2007
|
|
*
|
|
* 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 __DRIVERS_INPUT_ADS7843E_H
|
|
#define __DRIVERS_INPUT_ADS7843E_H
|
|
|
|
/********************************************************************************************
|
|
* Included Files
|
|
********************************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdint.h>
|
|
#include <semaphore.h>
|
|
#include <poll.h>
|
|
#include <wdog.h>
|
|
#include <nuttx/wqueue.h>
|
|
|
|
#include <nuttx/spi/spi.h>
|
|
#include <nuttx/clock.h>
|
|
#include <nuttx/input/ads7843e.h>
|
|
|
|
/********************************************************************************************
|
|
* Pre-Processor Definitions
|
|
********************************************************************************************/
|
|
/* Configuration ****************************************************************************/
|
|
/* Reference counting is partially implemented, but not needed in the current design. */
|
|
|
|
#undef CONFIG_ADS7843E_REFCNT
|
|
|
|
/* ADS7843E Interfaces *********************************************************************/
|
|
/* ADS7843E command bit settings */
|
|
|
|
#define ADS7843E_CMD_PD0 (1 << 0) /* Bit 0: Power down mode select bit 0 */
|
|
#define ADS7843E_CMD_PD1 (1 << 1) /* Bit 1: Power down mode select bit 1 */
|
|
#define ADS7843E_CMD_SER (1 << 2) /* Bit 2: SER/DFR\: 0:DFR 1:SER */
|
|
#define ADS7843E_CMD_MODE8 (1 << 3) /* Bit 3: Mode 1:8-bits 0:12-bits */
|
|
#define ADS7843E_CMD_CHAN_SHIFT (4) /* Bits 4-6: Channel select bits */
|
|
#define ADS7843E_CMD_CHAN_MASK (7 << ADS7843E_CMD_CHAN_SHIFT)
|
|
#define ADS7843E_CMD_START (1 << 7) /* Bit 7: Start Bit */
|
|
|
|
/* ADS7843E Commands */
|
|
|
|
#define ADS7843_CMD_YPOSITION \
|
|
((1 << ADS7843E_CMD_CHAN_SHIFT)| ADS7843E_CMD_START | ADS7843E_CMD_PD0 | ADS7843E_CMD_PD1)
|
|
#define ADS7843_CMD_XPOSITION \
|
|
((5 << ADS7843E_CMD_CHAN_SHIFT)| ADS7843E_CMD_START | ADS7843E_CMD_PD0 | ADS7843E_CMD_PD1)
|
|
#define ADS7843_CMD_ENABPENIRQ \
|
|
((1 << ADS7843E_CMD_CHAN_SHIFT)| ADS7843E_CMD_START)
|
|
|
|
/* Driver support **************************************************************************/
|
|
/* This format is used to construct the /dev/input[n] device driver path. It
|
|
* defined here so that it will be used consistently in all places.
|
|
*/
|
|
|
|
#define DEV_FORMAT "/dev/input%d"
|
|
#define DEV_NAMELEN 16
|
|
|
|
/* Poll the pen position while the pen is down at this rate (50MS): */
|
|
|
|
#define ADS7843E_WDOG_DELAY ((50 + (MSEC_PER_TICK-1))/ MSEC_PER_TICK)
|
|
|
|
/********************************************************************************************
|
|
* Public Types
|
|
********************************************************************************************/
|
|
|
|
/* This describes the state of one contact */
|
|
|
|
enum ads7843e_contact_3
|
|
{
|
|
CONTACT_NONE = 0, /* No contact */
|
|
CONTACT_DOWN, /* First contact */
|
|
CONTACT_MOVE, /* Same contact, possibly different position */
|
|
CONTACT_UP, /* Contact lost */
|
|
};
|
|
|
|
/* This structure describes the results of one ADS7843E sample */
|
|
|
|
struct ads7843e_sample_s
|
|
{
|
|
uint8_t id; /* Sampled touch point ID */
|
|
uint8_t contact; /* Contact state (see enum ads7843e_contact_e) */
|
|
bool valid; /* True: x,y contain valid, sampled data */
|
|
uint16_t x; /* Measured X position */
|
|
uint16_t y; /* Measured Y position */
|
|
};
|
|
|
|
/* This structure describes the state of one ADS7843E driver instance */
|
|
|
|
struct ads7843e_dev_s
|
|
{
|
|
#ifdef CONFIG_ADS7843E_MULTIPLE
|
|
FAR struct ads7843e_dev_s *flink; /* Supports a singly linked list of drivers */
|
|
#endif
|
|
#ifdef CONFIG_ADS7843E_REFCNT
|
|
uint8_t crefs; /* Number of times the device has been opened */
|
|
#endif
|
|
uint8_t nwaiters; /* Number of threads waiting for ADS7843E data */
|
|
uint8_t id; /* Current touch point ID */
|
|
volatile bool penchange; /* An unreported event is buffered */
|
|
uint16_t threshx; /* Thresholding X value */
|
|
uint16_t threshy; /* Thresholding Y value */
|
|
sem_t devsem; /* Manages exclusive access to this structure */
|
|
sem_t waitsem; /* Used to wait for the availability of data */
|
|
|
|
FAR struct ads7843e_config_s *config; /* Board configuration data */
|
|
FAR struct spi_dev_s *spi; /* Saved SPI driver instance */
|
|
struct work_s work; /* Supports the interrupt handling "bottom half" */
|
|
struct ads7843e_sample_s sample; /* Last sampled touch point data */
|
|
WDOG_ID wdog; /* Poll the position while the pen is down */
|
|
|
|
/* The following is a list if poll structures of threads waiting for
|
|
* driver events. The 'struct pollfd' reference for each open is also
|
|
* retained in the f_priv field of the 'struct file'.
|
|
*/
|
|
|
|
#ifndef CONFIG_DISABLE_POLL
|
|
struct pollfd *fds[CONFIG_ADS7843E_NPOLLWAITERS];
|
|
#endif
|
|
};
|
|
|
|
/********************************************************************************************
|
|
* Public Function Prototypes
|
|
********************************************************************************************/
|
|
|
|
#ifdef __cplusplus
|
|
#define EXTERN extern "C"
|
|
extern "C" {
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* __DRIVERS_INPUT_ADS7843E_H */
|