157 lines
4.4 KiB
C
157 lines
4.4 KiB
C
/****************************************************************************
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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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