167 lines
6.0 KiB
C
167 lines
6.0 KiB
C
/****************************************************************************
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* drivers/ioexpander/mcp23x08.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __DRIVERS_IOEXPANDER_MCP23X08_H
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#define __DRIVERS_IOEXPANDER_MCP23X08_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/wdog.h>
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#include <nuttx/clock.h>
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#include <nuttx/mutex.h>
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#include <nuttx/wqueue.h>
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#include <nuttx/ioexpander/ioexpander.h>
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#include <nuttx/ioexpander/mcp23x08.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_MCP23X08)
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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 I/O expander support
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*
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* CONFIG_IOEXPANDER_MCP23X08
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* Enables support for the MCP23X08 driver (Needs CONFIG_INPUT)
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* CONFIG_MCP23X08_MULTIPLE
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* Can be defined to support multiple MCP23X08 devices on board.
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* CONFIG_MCP23X08_INT_NCALLBACKS
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* Maximum number of supported pin interrupt callbacks.
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* CONFIG_MCP23X08_INT_POLL
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* Enables a poll for missed interrupts
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* CONFIG_MCP23X08_INT_POLLDELAY
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* If CONFIG_MCP23X08_INT_POLL=y, then this is the delay in microseconds
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* between polls for missed interrupts.
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*/
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#ifndef CONFIG_I2C
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# error "CONFIG_I2C is required by MCP23X08"
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#endif
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#ifdef CONFIG_IOEXPANDER_INT_ENABLE
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# ifndef CONFIG_MCP23X08_INT_NCALLBACKS
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# define CONFIG_MCP23X08_INT_NCALLBACKS 4
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# endif
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#endif
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#ifdef CONFIG_IOEXPANDER_INT_ENABLE
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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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#endif
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#ifndef CONFIG_MCP23X08_INT_POLLDELAY
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# define CONFIG_MCP23X08_INT_POLLDELAY 500000
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#endif
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/* MCP23X08 Definitions *****************************************************/
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/* I2C frequency */
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#define MCP23X08_I2C_MAXFREQUENCY 400000 /* 400KHz */
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/* MCP23X08 *****************************************************************/
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/* If IOCON.BANK = 0 Addressing Mode */
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#define MCP23X08_IODIR 0x00
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#define MCP23X08_IPOL 0x01
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#define MCP23X08_GPINTEN 0x02
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#define MCP23X08_DEFVAL 0x03
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#define MCP23X08_INTCON 0x04
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#define MCP23X08_IOCON 0x05
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#define MCP23X08_GPPU 0x06
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#define MCP23X08_INTF 0x07
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#define MCP23X08_INTCAP 0x08
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#define MCP23X08_GPIO 0x09
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#define MCP23X08_OLAT 0x0a
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#define MCP23X08_IOCON_INTPOL (1 << 1) /* Polarity of INT output pin */
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#define MCP23X08_IOCON_ODR (1 << 2) /* Config INT pin as open-drain */
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#define MCP23X08_IOCON_HAEN (1 << 3) /* HW Address enable bit */
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#define MCP23X08_IOCON_DISSLW (1 << 4) /* Disable Slew Rate for SDA output */
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#define MCP23X08_IOCON_SEQOP (1 << 5) /* Disable Sequential Operation */
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#define MCP23X08_NR_GPIO_MAX 8
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#define MCP23X08_POLLDELAY (CONFIG_MCP23X08_INT_POLLDELAY / USEC_PER_TICK)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#ifdef CONFIG_IOEXPANDER_INT_ENABLE
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/* This type represents on registered pin interrupt callback */
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struct mcp23x08_callback_s
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{
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ioe_pinset_t pinset; /* Set of pin interrupts that will generate
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* the callback. */
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ioe_callback_t cbfunc; /* The saved callback function pointer */
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FAR void *cbarg; /* Callback argument */
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};
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#endif
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/* This structure represents the state of the MCP23X08 driver */
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struct mcp23x08_dev_s
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{
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struct ioexpander_dev_s dev; /* Nested structure to allow casting
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* as public gpio expander.
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*/
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#ifdef CONFIG_MCP23X08_MULTIPLE
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FAR struct mcp23x08_dev_s *flink; /* Supports a singly linked list of drivers */
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#endif
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FAR struct mcp23x08_config_s *config; /* Board configuration data */
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FAR struct i2c_master_s *i2c; /* Saved I2C driver instance */
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mutex_t lock; /* Mutual exclusion */
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#ifdef CONFIG_IOEXPANDER_INT_ENABLE
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#ifdef CONFIG_MCP23X08_INT_POLL
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struct wdog_s wdog; /* Timer used to poll for missed interrupts */
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#endif
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ioe_pinset_t input; /* Last input registers */
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ioe_pinset_t intstat; /* Pending interrupts */
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struct work_s work; /* Supports the interrupt handling "bottom half" */
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/* Saved callback information for each I/O expander client */
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struct mcp23x08_callback_s cb[CONFIG_MCP23X08_INT_NCALLBACKS];
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#endif
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};
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#endif /* CONFIG_IOEXPANDER && CONFIG_IOEXPANDER_MCP23X08 */
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#endif /* __DRIVERS_IOEXPANDER_MCP23X08_H */
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