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179 lines
7.3 KiB
179 lines
7.3 KiB
/******************************************************************************************** |
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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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* See also: |
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* "Low Voltage I/O Touch Screen Controller, TSC2046," Burr-Brown Products |
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* from Texas Instruments, SBAS265F, October 2002, Revised August 2007." |
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* |
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* "XPT2046 Data Sheet," Shenzhen XPTek Technology Co., Ltd, 2007 |
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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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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 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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