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uint8_t coe11,coe21;
uint8_t* coe1=&coe11;
uint8_t* coe2=&coe21;

	int cmd = i2c_cmd_link_create();
        i2c_master_start(cmd);
        i2c_master_write_byte(cmd, BME280_ADDRESS << 1 | WRITE_BIT, ACK_CHECK_EN);
	i2c_master_write_byte(cmd, BME280_ADDRESS << 1 | WRITE_BIT, ACK_CHECK_EN);
	i2c_master_write_byte(cmd, BME280_REGISTER_DIG_T1 , ACK_CHECK_EN);
	i2c_master_stop(cmd);
	ret = i2c_master_cmd_begin(i2c_num, cmd, 1000 / portTICK_RATE_MS);
	
	i2c_cmd_link_delete(cmd);
	    if (ret == ESP_FAIL) {
        return ret;
    }
    vTaskDelay(30 / portTICK_RATE_MS);
	cmd = i2c_cmd_link_create();
	i2c_master_start(cmd);
	i2c_master_write_byte(cmd, BME280_ADDRESS << 1 | READ_BIT, ACK_CHECK_EN);

	i2c_master_read_byte(cmd, coe1, ACK_VAL);
	i2c_master_read_byte(cmd, coe2, ACK_VAL);
	i2c_master_stop(cmd);
	
	ret = i2c_master_cmd_begin(i2c_num, cmd, 1000 / portTICK_RATE_MS);
    i2c_cmd_link_delete(cmd);
	printf("status: %02x\n", coe11);
	printf("status: %02x\n", coe21);