2022-01-30 07:40:14 +08:00
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/****************************************************************************
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* include/nuttx/i2c/tca9548a.h
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*
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2024-10-02 21:59:15 +08:00
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* SPDX-License-Identifier: Apache-2.0
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*
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2022-01-30 07:40:14 +08:00
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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 __INCLUDE_NUTTX_I2C_TCA9548A_H
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#define __INCLUDE_NUTTX_I2C_TCA9548A_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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/* It is possible to config. TCA9548A to communicate from 0x70-0x77 */
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#define TCA9548A_BASEADDR0 0x70
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#define TCA9548A_BASEADDR1 0x71
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#define TCA9548A_BASEADDR2 0x72
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#define TCA9548A_BASEADDR3 0x73
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#define TCA9548A_BASEADDR4 0x74
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#define TCA9548A_BASEADDR5 0x75
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#define TCA9548A_BASEADDR6 0x76
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#define TCA9548A_BASEADDR7 0x77
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/* The TCA9548A can multiplex up to 8 channels */
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#define TCA9548A_SEL_CH0 0x0
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#define TCA9548A_SEL_CH1 0x1
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#define TCA9548A_SEL_CH2 0x2
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#define TCA9548A_SEL_CH3 0x3
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#define TCA9548A_SEL_CH4 0x4
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#define TCA9548A_SEL_CH5 0x5
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#define TCA9548A_SEL_CH6 0x6
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#define TCA9548A_SEL_CH7 0x7
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct tca9548a_dev_s
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{
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FAR struct i2c_master_s *i2c; /* I2C interface */
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uint8_t addr;
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uint8_t state; /* Control register state */
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};
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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: tca9548a_lower_half
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*
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* Description:
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* Initialize the lower half of the TCA9548A by creating a i2c_master_s
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* for the virtual i2c master and link it to the associated TCA9548A 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 TCA9548A
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* channel - The channel number to be selected to communicate
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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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tca9548a_lower_half(FAR struct tca9548a_dev_s *dev, uint8_t channel);
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/****************************************************************************
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* Name: tca9548a_initialize
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*
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* Description:
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* Initialize the TCA9548A 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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* TCA9548A
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* addr - The I2C address of the TCA9548A. The base I2C address of the
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* TCA9548A 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 tca9548a_dev_s *tca9548a_initialize(FAR struct i2c_master_s *i2c,
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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_TCA9548A_H */
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