Core2ForAWS_Port_A_I2C_Write

esp_err_t Core2ForAWS_Port_A_I2C_Write(I2CDevice_t device, uint32_t register_address, uint8_t *data, uint16_t length);

Writes to I2C peripheral connected to expansion port A.

This function writes a specified number of bytes starting from the specified register on the peripheral.

Note

Some peripherals do not support specifying a register address to write to. In this scenario, input the I2C_NO_REG macro as the register_address.

Read more about I2C capabilities of the ESP32 microcontroller and available APIs in the ESP-IDF.

The example code allocates an I2C peripheral called port_A_peripheral of type I2CDevice_t that has a 7-bit device address of 0x68 and uses the standard baud rate. It then writes a single byte of data to a specific register on the device, with a message printed to the serial output if successful.

Example:

#include <stdio.h>
#include <stdlib.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include "esp_log.h"
#include "core2forAWS.h"
 
#define DEVICE_ADDRESS 0x68
 
static const char *TAG = "MAIN";
 
void app_main()
{
    Core2ForAWS_Init();
    I2CDevice_t port_A_peripheral = Core2ForAWS_Port_A_I2C_Begin(DEVICE_ADDRESS, PORT_A_I2C_STANDARD_BAUD);
 
    uint8_t my_data = 23;
    esp_err_t err = Core2ForAWS_Port_A_I2C_Read(port_A_peripheral, 0x30, &my_data, 1);
    if(!err){
        ESP_LOGI(TAG, "Successfully wrote to the I2C peripheral");    
    }
}

Parameters

[in]	device	The device configuration pointer.
[in]	register_address	The address of the register to begin reading to.
[in]	data	The data to write to the register(s).
[in]	length	The number of bytes to write to the peripheral.

Returns

The I2C device configuration.