I use these fonction to enable all three channels: HAL_TIM_OnePulse_Start(&htim3, TIM_CHANNEL_1); HAL_TIM_OnePulse_Start(&htim3, TIM_CHANNEL_2); HAL_TIM_OnePulse_Start(&htim3, TIM_CHANNEL_3);it have to insert this to enable ch3 but just for the chann...