/******************************************************************************************** * drivers/input/ads7843e.h * * Copyright (C) 2011-2012 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #include #include /******************************************************************************************** * 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_e { 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 */