173 lines
6.5 KiB
C
173 lines
6.5 KiB
C
/****************************************************************************
|
|
* include/nuttx/input/tsc2007.h
|
|
*
|
|
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* References:
|
|
* "1.2V to 3.6V, 12-Bit, Nanopower, 4-Wire Micro TOUCH SCREEN CONTROLLER
|
|
* with I2C Interface," SBAS405A March 2007, Revised, March 2009, Texas
|
|
* Instruments Incorporated
|
|
*
|
|
* 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/* The TSC2007 is an analog interface circuit for a human interface touch
|
|
* screen device. All peripheral functions are controlled through the command
|
|
* byte and onboard state machines.
|
|
*/
|
|
|
|
#ifndef __INCLUDE_NUTTX_INPUT_TSC2007_H
|
|
#define __INCLUDE_NUTTX_INPUT_TSC2007_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <nuttx/i2c.h>
|
|
|
|
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_TSC2007)
|
|
|
|
/****************************************************************************
|
|
* Pre-Processor Definitions
|
|
****************************************************************************/
|
|
/* Configuration ************************************************************/
|
|
/* Maximum number of threads than can be waiting for POLL events */
|
|
|
|
#ifndef CONFIG_TSC2007_NPOLLWAITERS
|
|
# define CONFIG_TSC2007_NPOLLWAITERS 2
|
|
#endif
|
|
|
|
/* Check for some required settings. This can save the user a lot of time
|
|
* in getting the right configuration.
|
|
*/
|
|
|
|
#ifndef CONFIG_I2C_TRANSFER
|
|
# error "CONFIG_I2C_TRANSFER is required in the I2C configuration"
|
|
#endif
|
|
|
|
#ifdef CONFIG_DISABLE_SIGNALS
|
|
# error "Signals are required. CONFIG_DISABLE_SIGNALS must not be selected."
|
|
#endif
|
|
|
|
#ifndef CONFIG_SCHED_WORKQUEUE
|
|
# error "Work queue support required. CONFIG_SCHED_WORKQUEUE must be selected."
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
/* A reference to a structure of this type must be passed to the TSC2007
|
|
* driver. This structure provides information about the configuration
|
|
* of the TSB2007 and provides some board-specific hooks.
|
|
*
|
|
* Memory for this structure is provided by the caller. It is not copied
|
|
* by the driver and is presumed to persist while the driver is active. The
|
|
* memory must be writable because, under certain circumstances, the driver
|
|
* may modify frequency or X plate resistance values.
|
|
*/
|
|
|
|
struct tsc2007_config_s
|
|
{
|
|
/* Device characterization */
|
|
|
|
uint8_t address; /* 7-bit I2C address (only bits 0-6 used) */
|
|
uint16_t rxplate; /* Calibrated X plate resistance */
|
|
uint32_t frequency; /* I2C frequency */
|
|
|
|
/* If multiple TSC2007 devices are supported, then an IRQ number must
|
|
* be provided for each so that their interrupts can be distinguished.
|
|
*/
|
|
|
|
#ifndef CONFIG_TSC2007_MULTIPLE
|
|
int irq; /* IRQ number received by interrupt handler. */
|
|
#endif
|
|
|
|
/* IRQ/GPIO access callbacks. These operations all hidden behind
|
|
* callbacks to isolate the TSC2007 driver from differences in GPIO
|
|
* interrupt handling by varying boards and MCUs. If possible,
|
|
* interrupts should be configured on both rising and falling edges
|
|
* so that contact and loss-of-contact events can be detected.
|
|
*
|
|
* attach - Attach the TSC2007 interrupt handler to the GPIO interrupt
|
|
* enable - Enable or disable the GPIO interrupt
|
|
* clear - Acknowledge/clear any pending GPIO interrupt
|
|
* pendown - Return the state of the pen down GPIO input
|
|
*/
|
|
|
|
int (*attach)(FAR struct tsc2007_config_s *state, xcpt_t isr);
|
|
void (*enable)(FAR struct tsc2007_config_s *state, bool enable);
|
|
void (*clear)(FAR struct tsc2007_config_s *state);
|
|
bool (*pendown)(FAR struct tsc2007_config_s *state);
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
#ifdef __cplusplus
|
|
#define EXTERN extern "C"
|
|
extern "C" {
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: tsc2007_register
|
|
*
|
|
* Description:
|
|
* Configure the TSC2007 to use the provided I2C device instance. This
|
|
* will register the driver as /dev/inputN where N is the minor device
|
|
* number
|
|
*
|
|
* Input Parameters:
|
|
* dev - An I2C driver instance
|
|
* config - Persistant board configuration data
|
|
* minor - The input device minor number
|
|
*
|
|
* Returned Value:
|
|
* Zero is returned on success. Otherwise, a negated errno value is
|
|
* returned to indicate the nature of the failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
EXTERN int tsc2007_register(FAR struct i2c_dev_s *dev,
|
|
FAR struct tsc2007_config_s *config,
|
|
int minor);
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_INPUT && CONFIG_INPUT_TSC2007 */
|
|
#endif /* __INCLUDE_NUTTX_INPUT_TSC2007_H */
|