why degree is raise all the time?

[judemoses]

hi !my english is limited 我猜你是中国人！我也是！如果可以的话请求你的帮助！[email protected]
i want to turn by gyro,but i fail，the degrees of gyro is raising ,is a bug?how can i fix it?

void GyroLeftTurn(int nLTargetDegree, int nTurnLPower) {
//ev3_gyro_sensor_reset (SENSOR_G);
while (-1 * (ev3_gyro_sensor_get_angle(SENSOR_G)) <= nLTargetDegree) {
ev3_motor_set_power(R_MOTOR, nTurnLPower);
ev3_motor_set_power(L_MOTOR, 0);
}

ev3_motor_stop(L_MOTOR, true);
ev3_motor_stop(R_MOTOR, true);

}

[qiux7hyun]

reset the gyro:
get out the gyro line,
put it in again and don't move gyro before it up(until u can read angle)