Question
STM32F103RBT6 external counter
I'm using the STM32F103RBT6 to counter a external pulses with TIM3. But the counter is always ZERO. I can check the pulse with oscillometer. It is about 1KHz. Here is the code. Could any one tell me what is the issue ? Thank you.
int main(void)
{
/* USER CODE BEGIN 1 */
u16 valComp,Tests;
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_AFIO);
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
/* System interrupt init*/
/** NOJTAG: JTAG-DP Disabled and SW-DP Enabled
*/
LL_GPIO_AF_Remap_SWJ_NOJTAG();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_IWDG_Init();
MX_TIM2_Init();
MX_TIM3_Init();
MX_TIM4_Init();
MX_USART2_UART_Init();
MX_I2C1_Init();
/* USER CODE BEGIN 2 */
OLED_Init();
OLED_CLS();
OLED_ShowStr(20,0,"power off");
LL_TIM_EnableCounter(TIM2);
LL_TIM_EnableCounter(TIM3);
LL_TIM_EnableCounter(TIM4);
LL_TIM_CC_EnableChannel(TIM3, LL_TIM_CHANNEL_CH1);
LL_IWDG_Enable(IWDG);
valComp=2048; //周期4096 514us 2048代表�?�空比50% 数字越�? 高电平时间越短 为0时 �?有500ns高脉冲 为4096时 全高
Tests=0;
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
if (ISSET(KeyPress)) {
OLED_Show16_8_Number(20, 2, valComp,4);
if (valComp>100) {
LL_TIM_OC_SetCompareCH3(TIM4, valComp);
LL_TIM_OC_SetCompareCH4(TIM4, valComp);
valComp=valComp-100;
}
else if (valComp==0) valComp=4096;
else {
LL_TIM_OC_SetCompareCH3(TIM4, 0);
LL_TIM_OC_SetCompareCH4(TIM4, 0);
valComp=0;
}
POWTOG;
if (IsPowOn) {
OLED_ShowStr(20,0,"power on ");
LL_TIM_CC_EnableChannel(TIM4, LL_TIM_CHANNEL_CH4);
}
else {
OLED_ShowStr(20,0,"power off");
LL_TIM_CC_DisableChannel(TIM4, LL_TIM_CHANNEL_CH4);
}
RESETBIT(KeyPress);
}
if (ISSET(StartTest)) {
Tests++;
OLED_Show16_8_Number(80, 4, Tests,4);
OLED_Show16_8_Number(20, 4, LL_TIM_GetCounter(TIM3),4);
LL_TIM_DisableCounter(TIM3);
LL_TIM_SetCounter(TIM3, 0);
LL_TIM_EnableCounter(TIM3);
RESETBIT(StartTest);
}
}
/* USER CODE END 3 */
}
/**
* @brief TIM3 Initialization Function
* @param None
* @retval None
*/
static void MX_TIM3_Init(void)
{
/* USER CODE BEGIN TIM3_Init 0 */
/* USER CODE END TIM3_Init 0 */
LL_TIM_InitTypeDef TIM_InitStruct = {0};
LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
/* Peripheral clock enable */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM3);
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOB);
/**TIM3 GPIO Configuration
PB4 ------> TIM3_CH1
*/
GPIO_InitStruct.Pin = LL_GPIO_PIN_4;
GPIO_InitStruct.Mode = LL_GPIO_MODE_FLOATING;
LL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* TIM3 interrupt Init */
NVIC_SetPriority(TIM3_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0));
NVIC_EnableIRQ(TIM3_IRQn);
/* USER CODE BEGIN TIM3_Init 1 */
/* USER CODE END TIM3_Init 1 */
TIM_InitStruct.Prescaler = 0;
TIM_InitStruct.CounterMode = LL_TIM_COUNTERMODE_UP;
TIM_InitStruct.Autoreload = 65535;
TIM_InitStruct.ClockDivision = LL_TIM_CLOCKDIVISION_DIV1;
LL_TIM_Init(TIM3, &TIM_InitStruct);
LL_TIM_EnableARRPreload(TIM3);
LL_TIM_SetTriggerInput(TIM3, LL_TIM_TS_TI1FP1);
LL_TIM_SetClockSource(TIM3, LL_TIM_CLOCKSOURCE_EXT_MODE1);
LL_TIM_IC_SetFilter(TIM3, LL_TIM_CHANNEL_CH1, LL_TIM_IC_FILTER_FDIV32_N8);
LL_TIM_IC_SetPolarity(TIM3, LL_TIM_CHANNEL_CH1, LL_TIM_IC_POLARITY_RISING);
LL_TIM_DisableIT_TRIG(TIM3);
LL_TIM_DisableDMAReq_TRIG(TIM3);
LL_TIM_SetTriggerOutput(TIM3, LL_TIM_TRGO_UPDATE);
LL_TIM_EnableMasterSlaveMode(TIM3);
/* USER CODE BEGIN TIM3_Init 2 */
LL_TIM_EnableIT_UPDATE(TIM3);
LL_TIM_EnableIT_CC1(TIM3);
LL_TIM_EnableIT_TRIG(TIM3);
/* USER CODE END TIM3_Init 2 */
}