void beep_start(uint8_t times, uint16_t interval)
{
while(times--)
{
if(HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_4) !=HAL_OK)
{
Error_Handler();
}
HAL_Delay(interval);
if(HAL_TIM_PWM_Stop(&htim1, TIM_CHANNEL_4) !=HAL_OK)
{
Error_Handler();
}
HAL_Delay(interval);
}
}