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https://github.com/apache/nuttx.git
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boards/esp32: Add support to use TCA9548A multiplexer
This commit is contained in:
Alan C. Assis
committed by
Petro Karashchenko
Petro Karashchenko
parent
0b23257ef1
commit
09c4c2f35f
@@ -0,0 +1,88 @@
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/****************************************************************************
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* boards/xtensa/esp32/common/include/esp32_tca9548a.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 __BOARDS_XTENSA_ESP32_COMMON_INCLUDE_ESP32_TCA9548A_H
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#define __BOARDS_XTENSA_ESP32_COMMON_INCLUDE_ESP32_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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/****************************************************************************
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* Public Data
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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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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: board_tca9548a_initialize
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*
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* Description:
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* Initialize and register the TCA9548A Pressure Sensor driver.
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*
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* Input Parameters:
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* devno - The device number, used to build the device path as /dev/pressN
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* busno - The I2C bus number
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int board_tca9548a_initialize(int devno, int busno);
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/****************************************************************************
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* Name: esp32_i2cmux_getmaster
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*
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* Description:
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* Returns an I2C Master for TCA9548A multiplexer channel.
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*
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* NOTE: esp32_i2cmux_getmaster() is generic name, it can be used to return
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* an I2C Master for others I2C Master, not only TCA9548A.
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*
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* Input Parameters:
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* devno - The device number, it is the TCA9548A I2C_Addr minus 0x70.
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* channel - The TCA9548A's channel where the device will be added.
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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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struct i2c_master_s *esp32_i2cmux_getmaster(int devno, uint8_t channel);
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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 /* __BOARDS_XTENSA_ESP32_COMMON_INCLUDE_ESP32_TCA9548A_H */
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@@ -30,6 +30,10 @@ ifeq ($(CONFIG_I2C_DRIVER),y)
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CSRCS += esp32_board_i2c.c
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endif
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ifeq ($(CONFIG_I2CMULTIPLEXER_TCA9548A),y)
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CSRCS += esp32_tca9548a.c
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endif
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ifeq ($(CONFIG_ESP32_SPI),y)
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CSRCS += esp32_board_spi.c
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endif
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@@ -35,6 +35,10 @@
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#include "esp32_i2c.h"
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#include "esp32_ms5611.h"
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#ifdef CONFIG_I2CMULTIPLEXER_TCA9548A
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# include "esp32_tca9548a.h"
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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@@ -57,20 +61,28 @@
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int board_ms5611_initialize(int devno, int busno)
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{
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struct i2c_master_s *i2c;
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char devpath[12];
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int ret;
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sninfo("Initializing MS5611!\n");
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/* Initialize MS5611 */
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#ifdef CONFIG_BOARD_HAVE_I2CMUX
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/* We will use the devno as channel to avoid modifying the
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* board_ms5611_initialize() function. If you connected your
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* MS5611 to another channel, pass it to the devno of the
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* board_ms5611_initialize() function.
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*/
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i2c = esp32_i2cmux_getmaster(busno, devno);
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#else
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i2c = esp32_i2cbus_initialize(busno);
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#endif
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if (i2c != NULL)
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{
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/* Then try to register the barometer sensor in I2C0 */
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snprintf(devpath, sizeof(devpath), "/dev/press%d", devno);
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ret = ms5611_register(i2c, devno, MS5611_ADDR0);
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if (ret < 0)
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{
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@@ -0,0 +1,156 @@
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/****************************************************************************
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* boards/xtensa/esp32/common/src/esp32_tca9548a.c
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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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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/i2c/tca9548a.h>
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#include "esp32_board_i2c.h"
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#include "esp32_i2c.h"
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#include "esp32_tca9548a.h"
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struct tca9548a_dev_s *g_tca9448a_devs[8] =
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{
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL
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};
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: board_tca9548a_initialize
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*
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* Description:
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* Initialize and register the TCA9548A Multiplexer.
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*
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* Input Parameters:
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* devno - The device number associated to I2C address, 0=0x70 ... 7=0x77
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* busno - The I2C bus number
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int board_tca9548a_initialize(int devno, int busno)
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{
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struct i2c_master_s *i2c;
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uint8_t addr;
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i2cinfo("Initializing TCA9548A!\n");
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/* TCA9548A valid addresses are 0:0x70 - 7:0x77 */
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addr = TCA9548A_BASEADDR0 + devno;
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if (addr < TCA9548A_BASEADDR0 || addr > TCA9548A_BASEADDR7)
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{
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i2cerr("Invalid devno: %d! Valid range: 0 to 7!\n", devno);
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return -EINVAL;
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}
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/* Initialize TCA9548A */
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i2c = esp32_i2cbus_initialize(busno);
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if (i2c != NULL)
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{
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/* Check if this position is not used */
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if (g_tca9448a_devs[devno] != NULL)
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{
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i2cerr("ERROR: This tca9548a_devs[%d] is in use!\n", devno);
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return -EFAULT;
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}
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/* Then try to initialize the TCA9548A */
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g_tca9448a_devs[devno] = tca9548a_initialize(i2c, addr);
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if (g_tca9448a_devs[devno] == NULL)
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{
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i2cerr("ERROR: Error registering TCA9548A in I2C%d\n", busno);
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return -ENODEV;
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}
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}
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else
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{
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return -ENODEV;
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}
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return OK;
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}
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/****************************************************************************
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* Name: esp32_i2cmux_getmaster
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*
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* Description:
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* Returns an I2C Master for TCA9548A multiplexer channel.
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*
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* NOTE: esp32_i2cmux_getmaster() is generic name, it can be used to return
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* an I2C Master for others I2C Master, not only TCA9548A.
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*
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* Input Parameters:
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* devno - The device number, it is the TCA9548A I2C_Addr minus 0x70.
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* channel - The TCA9548A's channel where the device will be added.
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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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struct i2c_master_s *esp32_i2cmux_getmaster(int devno, uint8_t channel)
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{
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int addr = devno + TCA9548A_BASEADDR0;
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/* Check if we have a valid device number */
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if (addr < TCA9548A_BASEADDR0 || addr > TCA9548A_BASEADDR7)
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{
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i2cerr("Invalid devno: %d! Valid range: 0 to 7!\n", devno);
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return NULL;
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}
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/* Check if we have a valid channel */
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if (channel > TCA9548A_SEL_CH7)
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{
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snerr("Invalid channel: %d! Valid range: 0 to 7!\n", channel);
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return NULL;
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}
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return tca9548a_lower_half(g_tca9448a_devs[devno], channel);
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}
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@@ -81,6 +81,10 @@
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# include "esp32_board_i2c.h"
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#endif
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#ifdef CONFIG_I2CMULTIPLEXER_TCA9548A
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# include "esp32_tca9548a.h"
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#endif
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#ifdef CONFIG_SENSORS_BMP180
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# include "esp32_bmp180.h"
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#endif
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@@ -369,6 +373,21 @@ int esp32_bringup(void)
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}
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#endif
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/* Register the TCA9548A Multiplexer before others I2C drivers to allow it
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* be used by other drivers. Look at esp32_ms5611.c how to use it.
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*/
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#ifdef CONFIG_I2CMULTIPLEXER_TCA9548A
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/* Add the TCA9548A Mux as device 0 (0x70) in I2C Bus 0 */
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ret = board_tca9548a_initialize(0, 0);
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if (ret < 0)
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{
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syslog(LOG_ERR, "Failed to initialize TCA9548A driver: %d\n", ret);
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return ret;
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}
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#endif
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#ifdef CONFIG_I2C_DRIVER
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#ifdef CONFIG_ESP32_I2C0
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