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- /********************************************************************************************
- * drivers/ioexpander/pcf8574.h
- *
- * Copyright (C) 2016 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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_PCF8574_H
- #define __DRIVERS_IOEXPANDER_PCF8574_H
- /********************************************************************************************
- * Included Files
- ********************************************************************************************/
- #include <nuttx/config.h>
- #include <semaphore.h>
- #include <nuttx/wdog.h>
- #include <nuttx/clock.h>
- #include <nuttx/wqueue.h>
- #include <nuttx/ioexpander/ioexpander.h>
- #include <nuttx/ioexpander/pcf8574.h>
- #include <nuttx/i2c/i2c_master.h>
- #include <nuttx/irq.h>
- #if defined(CONFIG_IOEXPANDER) && defined(CONFIG_IOEXPANDER_PCF8574)
- /********************************************************************************************
- * Pre-processor Definitions
- ********************************************************************************************/
- /* Configuration ****************************************************************************/
- /* Prerequisites:
- * CONFIG_I2C
- * I2C support is required
- * CONFIG_IOEXPANDER
- * Enables I/O expander support
- *
- * CONFIG_IOEXPANDER_PCF8574
- * Enables support for the PCF8574 driver (Needs CONFIG_INPUT)
- * CONFIG_PCF8574_MULTIPLE
- * Can be defined to support multiple PCF8574 devices on board.
- * CONFIG_PCF8574_INT_NCALLBACKS
- * Maximum number of supported pin interrupt callbacks.
- * CONFIG_PCF8574_INT_POLL
- * Enables a poll for missed interrupts
- * CONFIG_PCF8574_INT_POLLDELAY
- * If CONFIG_PCF8574_INT_POLL=y, then this is the delay in microseconds
- * between polls for missed interrupts.
- */
- #ifndef CONFIG_I2C
- # error "CONFIG_I2C is required by PCF8574"
- #endif
- #ifdef CONFIG_IOEXPANDER_INT_ENABLE
- # ifndef CONFIG_PCF8574_INT_NCALLBACKS
- # define CONFIG_PCF8574_INT_NCALLBACKS 4
- # endif
- #endif
- #ifdef CONFIG_IOEXPANDER_INT_ENABLE
- # ifndef CONFIG_SCHED_WORKQUEUE
- # error Work queue support required. CONFIG_SCHED_WORKQUEUE must be selected.
- # endif
- #endif
- #ifndef CONFIG_PCF8574_INT_POLLDELAY
- # define CONFIG_PCF8574_INT_POLLDELAY 500000
- #endif
- /* PCF8574 Definitions **********************************************************************/
- #define PCF8574_I2C_MAXFREQUENCY 400000 /* 400KHz */
- #define PCF8574_POLLDELAY (CONFIG_PCF8574_INT_POLLDELAY / USEC_PER_TICK)
- #define PCF8574_LEVEL_SENSITIVE(d,p) \
- (((d)->trigger & ((ioe_pinset_t)1 << (p))) == 0)
- #define PCF8574_LEVEL_HIGH(d,p) \
- (((d)->level[0] & ((ioe_pinset_t)1 << (p))) != 0)
- #define PCF8574_LEVEL_LOW(d,p) \
- (((d)->level[1] & ((ioe_pinset_t)1 << (p))) != 0)
- #define PCF8574_EDGE_SENSITIVE(d,p) \
- (((d)->trigger & ((ioe_pinset_t)1 << (p))) != 0)
- #define PCF8574_EDGE_RISING(d,p) \
- (((d)->level[0] & ((ioe_pinset_t)1 << (p))) != 0)
- #define PCF8574_EDGE_FALLING(d,p) \
- (((d)->level[1] & ((ioe_pinset_t)1 << (p))) != 0)
- #define PCF8574_EDGE_BOTH(d,p) \
- (PCF8574_LEVEL_RISING(d,p) && PCF8574_LEVEL_FALLING(d,p))
- /********************************************************************************************
- * Public Types
- ********************************************************************************************/
- #ifdef CONFIG_IOEXPANDER_INT_ENABLE
- /* This type represents on registered pin interrupt callback */
- struct pcf8574_callback_s
- {
- ioe_pinset_t pinset; /* Set of pin interrupts that will generate
- * the callback. */
- ioe_callback_t cbfunc; /* The saved callback function pointer */
- FAR void *cbarg; /* Callback argument */
- };
- #endif
- /* This structure represents the state of the PCF8574 driver */
- struct pcf8574_dev_s
- {
- struct ioexpander_dev_s dev; /* Nested structure to allow casting as public gpio
- * expander. */
- FAR struct pcf8574_config_s *config; /* Board configuration data */
- FAR struct i2c_master_s *i2c; /* Saved I2C driver instance */
- sem_t exclsem; /* Mutual exclusion */
- uint8_t inpins; /* Set of input pins */
- uint8_t outstate; /* State of all output pins */
- #ifdef CONFIG_IOEXPANDER_INT_ENABLE
- #ifdef CONFIG_PCF8574_INT_POLL
- WDOG_ID wdog; /* Timer used to poll for missed interrupts */
- #endif
- uint8_t input; /* Last input registeres */
- uint8_t intstat; /* Pending interrupts */
- uint8_t trigger; /* Bit encoded: 0=level 1=edge */
- uint8_t level[2]; /* Bit encoded: 01=high/rising, 10 low/falling, 11 both */
- struct work_s work; /* Supports the interrupt handling "bottom half" */
- /* Saved callback information for each I/O expander client */
- struct pcf8574_callback_s cb[CONFIG_PCF8574_INT_NCALLBACKS];
- #endif
- };
- #endif /* CONFIG_IOEXPANDER && CONFIG_IOEXPANDER_PCF8574 */
- #endif /* __DRIVERS_IOEXPANDER_PCF8574_H */
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