83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
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/****************************************************************************
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* drivers/ioexpander/pcf8575.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_PCF8575_H
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#define __DRIVERS_IOEXPANDER_PCF8575_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/mutex.h>
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#include <nuttx/ioexpander/ioexpander.h>
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#include <nuttx/ioexpander/pcf8575.h>
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#include <nuttx/i2c/i2c_master.h>
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#if defined(CONFIG_IOEXPANDER) && defined(CONFIG_IOEXPANDER_PCF8575)
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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_PCF8575
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* Enables support for the PCF8575 driver (Needs CONFIG_INPUT)
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* CONFIG_PCF8575_MULTIPLE
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* Can be defined to support multiple PCF8575 devices on board.
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*/
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#ifndef CONFIG_I2C
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# error "CONFIG_I2C is required by PCF8575"
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#endif
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/* PCF8575 Definitions ******************************************************/
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#define PCF8575_I2C_MAXFREQUENCY 400000 /* 400KHz */
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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 PCF8575 driver */
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struct pcf8575_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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FAR struct pcf8575_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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uint16_t inpins; /* Set of input pins */
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uint16_t outstate; /* State of all output pins */
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};
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#endif /* CONFIG_IOEXPANDER && CONFIG_IOEXPANDER_PCF8575 */
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#endif /* __DRIVERS_IOEXPANDER_PCF8575_H */
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