forked from Archive/PX4-Autopilot
168 lines
6.7 KiB
C
168 lines
6.7 KiB
C
/********************************************************************************************
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* drivers/input/max11802.h
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*
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* Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
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* Authors: Gregory Nutt <gnutt@nuttx.org>
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* Petteri Aimonen <jpa@nx.mail.kapsi.fi>
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*
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* References:
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* "Low-Power, Ultra-Small Resistive Touch-Screen Controllers
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* with I2C/SPI Interface" Maxim IC, Rev 3, 10/2010
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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_MAX11802_H
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#define __DRIVERS_INPUT_MAX11802_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/max11802.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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/* MAX11802 Interfaces *********************************************************************/
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/* LSB of register addresses specifies read (1) or write (0). */
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#define MAX11802_CMD_XPOSITION ((0x52 << 1) | 1)
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#define MAX11802_CMD_YPOSITION ((0x54 << 1) | 1)
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#define MAX11802_CMD_MEASUREXY (0x70 << 1)
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#define MAX11802_CMD_MODE_WR (0x0B << 1)
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#define MAX11802_CMD_MODE_RD ((0x0B << 1) | 1)
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#define MAX11802_CMD_AVG_WR (0x03 << 1)
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#define MAX11802_CMD_TIMING_WR (0x05 << 1)
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#define MAX11802_CMD_DELAY_WR (0x06 << 1)
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/* Register values to set */
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#define MAX11802_MODE 0x0E
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#define MAX11802_AVG 0x55
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#define MAX11802_TIMING 0x77
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#define MAX11802_DELAY 0x55
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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 MAX11802_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 max11802_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 MAX11802 sample */
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struct max11802_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 MAX11802 driver instance */
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struct max11802_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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uint8_t nwaiters; /* Number of threads waiting for MAX11802 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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uint16_t threshx; /* Thresholding X value */
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uint16_t threshy; /* Thresholding Y value */
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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 max11802_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 max11802_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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