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#include <stdio.h>
#include "driver/i2c.h"
#include "driver/periph_ctrl.h"


#define ACK_CHECK_EN   0x1
#define ACK_CHECK_DIS  0x0              /*!< I2C master will not check ack from slave */
#define I2C_MASTER_NUM I2C_NUM_0   /*!< I2C port number for master dev */
#define I2C_MASTER_TX_BUF_DISABLE   0   /*!< I2C master do not need buffer */
#define I2C_MASTER_RX_BUF_DISABLE   0   /*!< I2C master do not need buffer */
#define WRITE_BIT  I2C_MASTER_WRITE /*!< I2C master write */
#define READ_BIT   I2C_MASTER_READ  /*!< I2C master read */
#define ACK_VAL    0x0         /*!< I2C ack value */
#define NACK_VAL   0x1         /*!< I2C nack value */

#define ADC_ADDRESS 0xF0
#define command 0xC3

i2c_cmd_handle_t i2c_cmd_handler;


void print_i2c_error_(int ret){
	if (ret != ESP_OK) {
		switch(ret){
			case ESP_FAIL: 
				printf("ESP_FAIL\n");
				break;
			case ESP_ERR_INVALID_ARG: 
				printf("ESP_ERR_INVALID_ARG\n");
				break;
			case ESP_ERR_INVALID_STATE: 
				printf("ESP_ERR_INVALID_STATE\n");
				break;
			case ESP_ERR_TIMEOUT: 
				printf("ESP_ERR_TIMEOUT\n");
				break;
			case ESP_OK: 
				printf("ESP_OK\n");
				break;
			default:
				printf("I2C Failed with code %d\n", ret);
		}
	}else{
		printf("Read Passed\n");
	}
}

uint8_t i2c_adc_read(){

    uint8_t ADC_VALUE_1 = 0;
    uint8_t ADC_VALUE_2 = 0x00;
    uint8_t ADC_VALUE_3 = 0x00;

    int ret = 0;

    printf("v___________________CNFG_0___________________v\n");
    i2c_cmd_handler = i2c_cmd_link_create();
	i2c_master_start(i2c_cmd_handler);
	i2c_master_write_byte(i2c_cmd_handler, ADC_ADDRESS | WRITE_BIT, ACK_CHECK_EN);
	i2c_master_write_byte(i2c_cmd_handler, command, ACK_CHECK_EN);
	i2c_master_stop(i2c_cmd_handler);
    ret = i2c_master_cmd_begin(I2C_MASTER_NUM, i2c_cmd_handler, 100 / portTICK_RATE_MS);
    print_i2c_error_(ret);
    i2c_cmd_link_delete(i2c_cmd_handler);
    printf("^___________________CNFG_0___________________^\n");


    printf("v___________________Read_____________________v\n");
    i2c_cmd_handler = i2c_cmd_link_create();
	i2c_master_start(i2c_cmd_handler);
	i2c_master_write_byte(i2c_cmd_handler, ADC_ADDRESS | READ_BIT, ACK_CHECK_EN);
	i2c_master_read_byte(i2c_cmd_handler, &ADC_VALUE_1, ACK_VAL);
	i2c_master_read_byte(i2c_cmd_handler, &ADC_VALUE_2, ACK_VAL);
	i2c_master_read_byte(i2c_cmd_handler, &ADC_VALUE_3, ACK_VAL);
	i2c_master_stop(i2c_cmd_handler);
	ret = i2c_master_cmd_begin(I2C_MASTER_NUM, i2c_cmd_handler, 100 / portTICK_RATE_MS);
    print_i2c_error_(ret);
	i2c_cmd_link_delete(i2c_cmd_handler);
    
    printf("ADC_VALUE_1: %02x\n", ADC_VALUE_1);
    printf("ADC_VALUE_2: %02x\n", ADC_VALUE_2);
    printf("ADC_VALUE_3: %02x\n", ADC_VALUE_3);
    printf("^___________________Read_____________________^\n");
    return 0;
}

void app_main(void)
{

	i2c_config_t conf;
	conf.mode = I2C_MODE_MASTER;
	conf.sda_io_num = 5;
	conf.scl_io_num = 17;
	conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
	conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
	conf.master.clk_speed = 100000;
	ESP_ERROR_CHECK(i2c_param_config(I2C_MASTER_NUM, &conf));
	ESP_ERROR_CHECK(i2c_driver_install(I2C_MASTER_NUM, I2C_MODE_MASTER, 0, 0, 0));

    while(1){
        printf("read\n");
        i2c_adc_read();
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
}

Code: Select all

read
v___________________CNFG_0___________________v
Read Passed
^___________________CNFG_0___________________^
v___________________Read_____________________v
ESP_ERR_TIMEOUT
ADC_VALUE_1: c3
ADC_VALUE_2: 86
ADC_VALUE_3: 60
^___________________Read_____________________^
readv___________________CNFG_0___________________v
Read Passed
^___________________CNFG_0___________________^
v___________________Read_____________________v
ESP_ERR_TIMEOUT
ADC_VALUE_1: c3
ADC_VALUE_2: 60
ADC_VALUE_3: 60
^___________________Read_____________________^