b73d7f2922
Datasheet: https://www.ti.com/lit/ds/symlink/pca9557.pdf Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>
96 lines
3.4 KiB
C
96 lines
3.4 KiB
C
/****************************************************************************
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* drivers/ioexpander/pca9557.h
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*
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* SPDX-License-Identifier: Apache-2.0
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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_PCA9557_H
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#define __DRIVERS_IOEXPANDER_PCA9557_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/pca9557.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_PCA9557)
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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 PCA9557 I/O expander
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*
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* CONFIG_IOEXPANDER_PCA9557
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* Enables support for the PCA9557 driver (Needs CONFIG_INPUT)
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*/
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/* PCA9557 Resources ********************************************************/
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#define PCA9557_GPIO_NPINS 8
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#define PCA9557_MAXDEVS 8
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/* I2C frequency */
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#define PCA9557_I2C_MAXFREQUENCY 400000 /* 400KHz */
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/* PCA9557 Registers ********************************************************/
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#define PCA9557_REG_NUM 4
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#define PCA9557_REG_INPUT 0x00
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#define PCA9557_REG_OUTPUT 0x01
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#define PCA9557_REG_POLINV 0x02
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#define PCA9557_REG_CONFIG 0x03
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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 PCA9557 driver */
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struct pca9557_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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#ifdef CONFIG_PCA9557_SHADOW_MODE
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uint8_t sreg[PCA9557_REG_NUM]; /* Shadowed registers */
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#endif
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FAR struct pca9557_config_s *config; /* Board configuration data */
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FAR struct i2c_master_s *i2c; /* Saved I2C driver instance */
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rmutex_t lock; /* Mutual exclusion */
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};
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#endif /* CONFIG_IOEXPANDER && CONFIG_IOEXPANDER_PCA9557 */
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#endif /* __DRIVERS_IOEXPANDER_PCA9557_H */
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