3d5e690977
are held in the microcontrollers memory and only written to the IO-Expander. This reduces bus traffic and is more error-proof than the normal read- modify-write operation. Retry Mode: If enabled and an error occurs while writing to the IO-Expander the current transmission is automatically repeated once.
135 lines
5.2 KiB
C
135 lines
5.2 KiB
C
/********************************************************************************************
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* drivers/ioexpander/pca9555.h
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Sebastien Lorquet <sebastien@lorquet.fr>
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*
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* References:
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* "16-bit I2C-bus and SMBus I/O port with interrupt product datasheet",
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* Rev. 08 - 22 October 2009, NXP
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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 __DRIVERS_IOEXPANDER_PCA9555_H
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#define __DRIVERS_IOEXPANDER_PCA9555_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 <semaphore.h>
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#include <nuttx/wdog.h>
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#include <nuttx/clock.h>
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#include <nuttx/ioexpander/ioexpander.h>
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#include <nuttx/ioexpander/pca9555.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/irq.h>
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#if defined(CONFIG_IOEXPANDER) && defined(CONFIG_IOEXPANDER_PCA9555)
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/********************************************************************************************
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* Pre-processor Definitions
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********************************************************************************************/
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/* Configuration ****************************************************************************/
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/* Prerequisites:
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* CONFIG_I2C
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* I2C support is required
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* CONFIG_IOEXPANDER
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* Enables support for the PCA9555 I/O expander
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*
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* Other settings that effect the driver: CONFIG_DISABLE_POLL
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*
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* CONFIG_IOEXPANDER_PCA9555
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* Enables support for the PCA9555 driver (Needs CONFIG_INPUT)
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* CONFIG_PCA9555_MULTIPLE
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* Can be defined to support multiple PCA9555 devices on board.
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* CONFIG_PCA9555_INT_DISABLE
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* Disable driver GPIO interrupt functionality (ignored if GPIO functionality is
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* disabled).
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*/
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#undef CONFIG_PCA9555_REFCNT
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/* Driver support ***************************************************************************/
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/* This format is used to construct the /dev/input[n] device driver path. It defined here
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* so that it will be used consistently in all places.
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*/
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/* PCA9555 Resources ************************************************************************/
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#define PCA9555_GPIO_NPINS 16 /* All pins can be used as GPIOs */
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#ifndef CONFIG_I2C
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#error "CONFIG_I2C is required by PCA9555"
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#endif
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#define PCA9555_MAXDEVS 8
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/* I2C frequency */
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#define PCA9555_I2C_MAXFREQUENCY 400000 /* 400KHz */
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/* PCA9555 Registers ************************************************************************/
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/* Register Addresses */
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#define PCA9555_REG_INPUT 0x00
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#define PCA9555_REG_OUTPUT 0x02
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#define PCA9555_REG_POLINV 0x04
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#define PCA9555_REG_CONFIG 0x06
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/********************************************************************************************
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* Public Types
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********************************************************************************************/
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/* This structure represents the state of the PCA9555 driver */
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struct pca9555_dev_s
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{
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struct ioexpander_dev_s dev; /* Nested structure to allow casting as public gpio
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* expander. */
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#ifdef CONFIG_IOEXPANDER_SHADOW_MODE
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uint8_t sreg[8]; /* Shadowed registers of the PCA9555 */
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#endif
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#ifdef CONFIG_PCA9555_MULTIPLE
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FAR struct pca9555_dev_s *flink; /* Supports a singly linked list of drivers */
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#endif
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FAR struct pca9555_config_s *config; /* Board configuration data */
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FAR struct i2c_master_s *i2c; /* Saved I2C driver instance */
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sem_t exclsem; /* Mutual exclusion */
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};
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#endif /* CONFIG_IOEXPANDER && CONFIG_IOEXPANDER_PCA9555 */
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#endif /* __DRIVERS_IOEXPANDER_PCA9555_H */
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