187 lines
6.8 KiB
C
187 lines
6.8 KiB
C
/****************************************************************************
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* include/nuttx/input/ads7843e.h
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Authors: Gregory Nutt <gnutt@nuttx.org>
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* Diego Sanchez <dsanchez@nx-engineering.com>
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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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* 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 __INCLUDE_NUTTX_INPUT_ADS7843E_H
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#define __INCLUDE_NUTTX_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 <nuttx/i2c/i2c_master.h>
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#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* SPI Frequency. Default: 100KHz */
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#ifndef CONFIG_ADS7843E_FREQUENCY
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# define CONFIG_ADS7843E_FREQUENCY 100000
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#endif
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/* Maximum number of threads than can be waiting for POLL events */
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#ifndef CONFIG_ADS7843E_NPOLLWAITERS
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# define CONFIG_ADS7843E_NPOLLWAITERS 2
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#endif
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#ifndef CONFIG_ADS7843E_SPIMODE
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# define CONFIG_ADS7843E_SPIMODE SPIDEV_MODE0
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#endif
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/* Thresholds */
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#ifndef CONFIG_ADS7843E_THRESHX
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# define CONFIG_ADS7843E_THRESHX 12
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#endif
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#ifndef CONFIG_ADS7843E_THRESHY
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# define CONFIG_ADS7843E_THRESHY 12
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#endif
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/* Check for some required settings. This can save the user a lot of time
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* in getting the right configuration.
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*/
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#ifndef CONFIG_SCHED_WORKQUEUE
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# error "Work queue support required. CONFIG_SCHED_WORKQUEUE must be selected."
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* A reference to a structure of this type must be passed to the ADS7843E
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* driver. This structure provides information about the configuration
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* of the TSB2007 and provides some board-specific hooks.
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*
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* Memory for this structure is provided by the caller. It is not copied
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* by the driver and is presumed to persist while the driver is active. The
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* memory must be writable because, under certain circumstances, the driver
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* may modify frequency or X plate resistance values.
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*/
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struct ads7843e_config_s
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{
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/* Device characterization */
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uint32_t frequency; /* SPI frequency */
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/* If multiple ADS7843E devices are supported, then an IRQ number must
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* be provided for each so that their interrupts can be distinguished.
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*/
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#ifndef CONFIG_ADS7843E_MULTIPLE
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int irq; /* IRQ number received by interrupt handler. */
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#endif
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/* IRQ/GPIO access callbacks. These operations all hidden behind
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* callbacks to isolate the ADS7843E driver from differences in GPIO
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* interrupt handling by varying boards and MCUs. If possible,
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* interrupts should be configured on both rising and falling edges
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* so that contact and loss-of-contact events can be detected.
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*
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* attach - Attach the ADS7843E interrupt handler to the GPIO interrupt
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* enable - Enable or disable the GPIO interrupt
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* clear - Acknowledge/clear any pending GPIO interrupt
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* busy - Return the state of the BUSY GPIO input (for debug only)
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* pendown - Return the state of the pen down GPIO input
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*
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* NOTE: The busy() method is not currently used by the driver. The BUSY
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* signal is only an informative signal that is raised after a command has
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* been send but before the sample data has been obtained.
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*/
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int (*attach)(FAR struct ads7843e_config_s *state, xcpt_t isr);
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void (*enable)(FAR struct ads7843e_config_s *state, bool enable);
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void (*clear)(FAR struct ads7843e_config_s *state);
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bool (*busy)(FAR struct ads7843e_config_s *state);
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bool (*pendown)(FAR struct ads7843e_config_s *state);
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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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/****************************************************************************
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* Name: ads7843e_register
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*
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* Description:
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* Configure the ADS7843E to use the provided SPI device instance. This
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* will register the driver as /dev/inputN where N is the minor device
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* number
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*
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* Input Parameters:
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* spi - An SPI driver instance
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* config - Persistent board configuration data
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* minor - The input device minor number
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*
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* Returned Value:
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* Zero is returned on success. Otherwise, a negated errno value is
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* returned to indicate the nature of the failure.
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*
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****************************************************************************/
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int ads7843e_register(FAR struct spi_dev_s *spi,
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FAR struct ads7843e_config_s *config,
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int minor);
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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 /* CONFIG_INPUT && CONFIG_INPUT_ADS7843E */
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#endif /* __INCLUDE_NUTTX_INPUT_ADS7843E_H */
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