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Diffstat (limited to 'nuttx/drivers/input/ads7843e.h')
| -rw-r--r-- | nuttx/drivers/input/ads7843e.h | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/nuttx/drivers/input/ads7843e.h b/nuttx/drivers/input/ads7843e.h new file mode 100644 index 000000000..030d1cb33 --- /dev/null +++ b/nuttx/drivers/input/ads7843e.h @@ -0,0 +1,171 @@ +/******************************************************************************************** + * 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" + * + * 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.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) /* PD0 */ +#define ADS7843E_CMD_PD1 (1 << 1) /* PD1 */ +#define ADS7843E_CMD_DFR (1 << 2) /* SER/DFR */ +#define ADS7843E_CMD_EIGHT_BITS_MOD (1 << 3) /* Mode */ +#define ADS7843E_CMD_START (1 << 7) /* Start Bit */ +#define ADS7843E_CMD_SWITCH_SHIFT 4 /* Address setting */ + +/* ADS7843E Commands */ + +#define ADS7843_CMD_YPOSITION \ + ((1 << ADS7843E_CMD_SWITCH_SHIFT)|ADS7843E_CMD_START|ADS7843E_CMD_PD0|ADS7843E_CMD_PD1) +#define ADS7843_CMD_XPOSITION \ + ((5 << ADS7843E_CMD_SWITCH_SHIFT)|ADS7843E_CMD_START|ADS7843E_CMD_PD0|ADS7843E_CMD_PD1) +#define ADS7843_CMD_ENABPINIRQ \ + ((1 << ADS7843E_CMD_SWITCH_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 */ + 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 */ |