130 lines
4.9 KiB
C
130 lines
4.9 KiB
C
/********************************************************************************************
|
|
* drivers/ioexpander/pca9555.h
|
|
*
|
|
* Copyright (C) 2015 Gregory Nutt. All rights reserved.
|
|
* Author: Sebastien Lorquet <sebastien@lorquet.fr>
|
|
*
|
|
* References:
|
|
* "16-bit I2C-bus and SMBus I/O port with interrupt product datasheet",
|
|
* Rev. 08 - 22 October 2009, NXP
|
|
*
|
|
* 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_IOEXPANDER_PCA9555_H
|
|
#define __DRIVERS_IOEXPANDER_PCA9555_H
|
|
|
|
/********************************************************************************************
|
|
* Included Files
|
|
********************************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <nuttx/wdog.h>
|
|
#include <nuttx/clock.h>
|
|
#include <nuttx/ioexpander/ioexpander.h>
|
|
#include <nuttx/ioexpander/pca9555.h>
|
|
|
|
#include <nuttx/i2c/i2c_master.h>
|
|
#include <nuttx/irq.h>
|
|
|
|
#if defined(CONFIG_IOEXPANDER) && defined(CONFIG_IOEXPANDER_PCA9555)
|
|
|
|
/********************************************************************************************
|
|
* Pre-processor Definitions
|
|
********************************************************************************************/
|
|
/* Configuration ****************************************************************************/
|
|
/* Prerequisites:
|
|
* CONFIG_I2C
|
|
* I2C support is required
|
|
* CONFIG_IOEXPANDER
|
|
* Enables support for the PCA9555 I/O expander
|
|
*
|
|
* Other settings that effect the driver: CONFIG_DISABLE_POLL
|
|
*
|
|
* CONFIG_IOEXPANDER_PCA9555
|
|
* Enables support for the PCA9555 driver (Needs CONFIG_INPUT)
|
|
* CONFIG_PCA9555_MULTIPLE
|
|
* Can be defined to support multiple PCA9555 devices on board.
|
|
* CONFIG_PCA9555_INT_DISABLE
|
|
* Disable driver GPIO interrupt functionality (ignored if GPIO functionality is
|
|
* disabled).
|
|
*/
|
|
|
|
#undef CONFIG_PCA9555_REFCNT
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
/* PCA9555 Resources ************************************************************************/
|
|
|
|
#define PCA9555_GPIO_NPINS 16 /* All pins can be used as GPIOs */
|
|
|
|
#ifndef CONFIG_I2C
|
|
#error "CONFIG_I2C is required by PCA9555"
|
|
#endif
|
|
|
|
#define PCA9555_MAXDEVS 8
|
|
|
|
/* I2C frequency */
|
|
|
|
#define PCA9555_I2C_MAXFREQUENCY 400000 /* 400KHz */
|
|
|
|
/* PCA9555 Registers ************************************************************************/
|
|
/* Register Addresses */
|
|
|
|
#define PCA9555_REG_INPUT 0x00
|
|
#define PCA9555_REG_OUTPUT 0x02
|
|
#define PCA9555_REG_POLINV 0x04
|
|
#define PCA9555_REG_CONFIG 0x06
|
|
|
|
/********************************************************************************************
|
|
* Public Types
|
|
********************************************************************************************/
|
|
|
|
/* This structure represents the state of the PCA9555 driver */
|
|
|
|
struct pca9555_dev_s
|
|
{
|
|
struct ioexpander_dev_s dev; /* Nested structure to allow casting as public gpio expander. */
|
|
|
|
#ifdef CONFIG_PCA9555_MULTIPLE
|
|
FAR struct pca9555_dev_s *flink; /* Supports a singly linked list of drivers */
|
|
#endif
|
|
|
|
FAR struct pca9555_config_s *config; /* Board configuration data */
|
|
FAR struct i2c_master_s *i2c; /* Saved I2C driver instance */
|
|
|
|
};
|
|
|
|
#endif /* CONFIG_IOEXPANDER && CONFIG_IOEXPANDER_PCA9555 */
|
|
#endif /* __DRIVERS_IOEXPANDER_PCA9555_H */
|