Hi everyone,
I'm trying to set a timer so that it works in output compare and also in one pulse mode, as I want it to only fire once. Below is my code for initiating timer1 in output compare/one pulse. Is this setup correct? One issue I'm having is that when the periodElapsedCallback is fired I set a flag which causes a variable count to be printed in the main loop in the main loop. Count is initialised to 0 and on my console I see it increment up to 1...so the values 0 & 1 are printed meaning that the timer ran twice. Any ideas what could be going wrong?
EDIT:if i comment out htim1.Instance->CR1 |= TIM_OPMODE_SINGLE; count keeps increasing (as it should since the timer resets) I just cant understand why when OPMODE is enabled it runs twice instead of once!
EDIT2: I've come to the conclusion that there are other factors which can trigger an UEV interrupt to be triggered but I can't find a list or something.
void MX_TIM1_Init(void){
htim1.Instance = TIM1;
htim1.Init.Prescaler = 12;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.Period = 65535;
htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim1.Init.RepetitionCounter = 0;
HAL_TIM_OC_Init(&htim1);
htim1.Instance->CR1 &= ~TIM_CR1_OPM;
htim1.Instance->CR1 |= TIM_OPMODE_SINGLE;//enable single shot mode
sConfig.OCMode = TIM_OCMODE_TOGGLE;
sConfig.Pulse = 420;
sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
HAL_TIM_OC_ConfigChannel(&htim1, &sConfig, TIM_CHANNEL_2);
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
if(htim->Instance == TIM1){
HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
onePulse=1;
}
}
int main(void)
{
uint16_t diffCapture = 0;
char msg[50];
float frequency =0;
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_UART_Init();
MX_TIM3_Init();
MX_TIM1_Init();
HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET);
HAL_TIM_OC_Start(&htim1,TIM_CHANNEL_2);
HAL_TIM_IC_Start_IT(&htim3,TIM_CHANNEL_1);
while(1){
while (onePulse != 1);
char Count[10];
sprintf(Count,"\r\n%d",count);
HAL_UART_Transmit(&huart2, (uint8_t*)Count,strlen(Count), HAL_MAX_DELAY);
count++;
onePulse =0;
}
}
