172 lines
6.4 KiB
C
172 lines
6.4 KiB
C
/****************************************************************************
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* drivers/input/ads7843e.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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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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#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 <poll.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/wdog.h>
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#include <nuttx/clock.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/spi/spi.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
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* design.
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*/
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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) /* Bit 0: Power down mode select bit 0 */
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#define ADS7843E_CMD_PD1 (1 << 1) /* Bit 1: Power down mode select bit 1 */
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#define ADS7843E_CMD_SER (1 << 2) /* Bit 2: SER/DFR\: 0:DFR 1:SER */
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#define ADS7843E_CMD_MODE8 (1 << 3) /* Bit 3: Mode 1:8-bits 0:12-bits */
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#define ADS7843E_CMD_CHAN_SHIFT (4) /* Bits 4-6: Channel select bits */
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#define ADS7843E_CMD_CHAN_MASK (7 << ADS7843E_CMD_CHAN_SHIFT)
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#define ADS7843E_CMD_START (1 << 7) /* Bit 7: Start Bit */
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/* ADS7843E Commands */
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#define ADS7843_CMD_YPOSITION \
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((1 << ADS7843E_CMD_CHAN_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_CHAN_SHIFT)| ADS7843E_CMD_START | ADS7843E_CMD_PD0 | ADS7843E_CMD_PD1)
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#define ADS7843_CMD_ENABPENIRQ \
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((1 << ADS7843E_CMD_CHAN_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 MSEC2TICK(50)
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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_e
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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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struct wdog_s 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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struct pollfd *fds[CONFIG_ADS7843E_NPOLLWAITERS];
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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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{
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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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