114 lines
3.8 KiB
C
114 lines
3.8 KiB
C
/****************************************************************************
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* include/nuttx/i2c/pca9540bdp.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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/****************************************************************************
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*
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* References:
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* "PCA9540B 2-channel I2C-bus multiplexer product datasheet",
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* 31 October 2016, NXP
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_I2C_PCA9540BDP_H
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#define __INCLUDE_NUTTX_I2C_PCA9540BDP_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 <sys/ioctl.h>
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#include <nuttx/i2c/i2c_master.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_PCA9540BDP_BASEADDR
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# define CONFIG_PCA9540BDP_BASEADDR 0x70
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#endif
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#define PCA9540BDP_SEL_PORT0 0x0
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#define PCA9540BDP_SEL_PORT1 0x1
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct pca9540bdp_dev_s;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: pca9540bdp_lower_half
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*
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* Description:
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* Initialize the lower half of the PCA9540BDP by creating a i2c_master_s
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* for the virtual i2c master and link it to the associated PCA9540BDP and
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* its port.
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*
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* Input Parameters:
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* dev - Pointer to the associated PCA9540BDP
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* port - The port number as defined in pca9540bdp.h
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*
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* Returned Value:
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* Common i2c multiplexer device instance; NULL on failure.
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*
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****************************************************************************/
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FAR struct i2c_master_s *
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pca9540bdp_lower_half(FAR struct pca9540bdp_dev_s *dev, uint8_t port);
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/****************************************************************************
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* Name: pca9540bdp_initialize
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*
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* Description:
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* Initialize the PCA9540BDP device.
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*
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* Input Parameters:
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* i2c - An instance of the I2C interface to use to communicate with
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* PCA9540BDP
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* addr - The I2C address of the PCA9540BDP. The base I2C address of the
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* PCA9540BDP is 0x70.
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*
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* Returned Value:
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* Common i2c multiplexer device instance; NULL on failure.
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*
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****************************************************************************/
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FAR struct pca9540bdp_dev_s *
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pca9540bdp_initialize(FAR struct i2c_master_s *i2c, uint8_t addr);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_I2C_PCA9540BDP_H */
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