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- /****************************************************************************
- * drivers/input/ads7843e.h
- *
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership. The
- * ASF licenses this file to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance with the
- * License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations
- * under the License.
- *
- ****************************************************************************/
- /* 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
- */
- #ifndef __DRIVERS_INPUT_ADS7843E_H
- #define __DRIVERS_INPUT_ADS7843E_H
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <stdint.h>
- #include <poll.h>
- #include <nuttx/wqueue.h>
- #include <nuttx/wdog.h>
- #include <nuttx/clock.h>
- #include <nuttx/semaphore.h>
- #include <nuttx/spi/spi.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 MSEC2TICK(50)
- /****************************************************************************
- * 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 */
- struct wdog_s 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'.
- */
- struct pollfd *fds[CONFIG_ADS7843E_NPOLLWAITERS];
- };
- /****************************************************************************
- * 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 */
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