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printf("i2c scanner\r\n\r\n");
// configure the i2c controller 0 in master mode, normal speed
i2c_config_t conf;
conf.mode = I2C_MODE_MASTER;
conf.sda_io_num = 14;
conf.scl_io_num = 27;
conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
conf.master.clk_speed = 10000;
ESP_ERROR_CHECK(i2c_param_config(I2C_NUM_0, &conf));

printf("- i2c controller configured\r\n");

// install the driver
ESP_ERROR_CHECK(i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, 0, 0, 0));
printf("- i2c driver installed\r\n\r\n");

printf("scanning the bus...\r\n\r\n");

int devices_found = 0;

for(int address = 1; address < 127; address++) {
	// create and execute the command link
	i2c_cmd_handle_t cmd = i2c_cmd_link_create();
	i2c_master_start(cmd);
	i2c_master_write_byte(cmd, (address << 1) | I2C_MASTER_WRITE, true);
	i2c_master_stop(cmd);
	if(i2c_master_cmd_begin(I2C_NUM_0, cmd, 1000 / portTICK_RATE_MS) == ESP_OK) {
		printf("-> found device with address 0x%02x\r\n", address);
		devices_found++;
	}
	i2c_cmd_link_delete(cmd);
}
if(devices_found == 0) printf("\r\n-> no devices found\r\n");
printf("\r\n...scan completed!\r\n");
	

Code: Select all

 i2c_config_t conf;