问题描述
我正在使用霍尔传感器构建转速表,并将其绑定到PE13或Tim1通道3。
一切似乎都在按预期的速率触发TIM1_CC_IRQHandler触发,但是每当我运行LL_TIM_IC_GetCaptureCH3(TIM1)时,我只能从函数调用中得到0。
我是否错过了我的设置代码?还是我误会了如何使用计时器和LL驱动程序?
设置代码:
// Enable Timer and Peripheral Clocks
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_TIM1);
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOE);
// Ensure Pins are Configured Correctly
LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
/**TIM1 GPIO Configuration
PE13 ------> TIM1_CH3
*/
GPIO_InitStruct.Pin = LL_GPIO_PIN_13;
GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
GPIO_InitStruct.Alternate = LL_GPIO_AF_1;
LL_GPIO_Init(GPIOE,&GPIO_InitStruct);
// Register FanTach CLI Comand
FreeRTOS_CLIRegisterCommand( &xFANTACH );
// Configure Timer for Capture Compare
LL_TIM_InitTypeDef TIM_InitStruct = {0};
TIM_InitStruct.Prescaler = 0;
TIM_InitStruct.CounterMode = LL_TIM_COUNTERMODE_UP;
TIM_InitStruct.Autoreload = 0;
TIM_InitStruct.ClockDivision = LL_TIM_CLOCKDIVISION_DIV1;
TIM_InitStruct.RepetitionCounter = 0;
LL_TIM_Init(TIM1,&TIM_InitStruct);
LL_TIM_disableARRPreload(TIM1);
LL_TIM_SetClockSource(TIM1,LL_TIM_CLOCKSOURCE_INTERNAL);
LL_TIM_SetTriggerOutput(TIM1,LL_TIM_TRGO_RESET);
LL_TIM_disableMasterSlaveMode(TIM1);
LL_TIM_IC_SetActiveInput(TIM1,LL_TIM_CHANNEL_CH3,LL_TIM_ACTIVEINPUT_DIRECTTI);
LL_TIM_IC_SetPrescaler(TIM1,LL_TIM_IcpsC_DIV1);
LL_TIM_IC_SetFilter(TIM1,LL_TIM_IC_FILTER_FDIV1);
LL_TIM_IC_SetPolarity(TIM1,LL_TIM_IC_POLARITY_RISING);
/* Set the pre-scaler value to have TIM2 counter clock equal to 10 MHz */
// To get TIM1 counter clock at 10 MHz,the Prescaler is computed as following:
// Prescaler = (TIM1CLK / TIM2 counter clock) - 1
// Prescaler = (TIM1CLK / 10 MHz) - 1
LL_TIM_SetPrescaler(TIM1,__LL_TIM_CALC_PSC(get_pclk2_freq(),10000000));
//Enable Interrupts
NVIC_SetPriority(TIM1_UP_TIM10_IRQn,NVIC_EncodePriority(NVIC_GetPriorityGrouping(),PreemptPriority,SubPriority));
NVIC_EnableIRQ(TIM1_UP_TIM10_IRQn);
NVIC_SetPriority(TIM1_CC_IRQn,SubPriority));
NVIC_EnableIRQ(TIM1_CC_IRQn);
/* Enable Capture Compare channel 3 for Timer 1 */
LL_TIM_EnableIT_CC3(TIM1);
//Start Input Capture
LL_TIM_CC_EnableChannel(TIM1,LL_TIM_CHANNEL_CH3);
//Enable Counter
LL_TIM_SetCounterMode(TIM1,LL_TIM_COUNTERMODE_UP);
LL_TIM_EnableCounter(TIM1);
}
解决方法
如果有人偶然遇到相同的问题,我分两步解决了这个问题:
- LL_TIM_DisableARRPreload应该是LL_TIM_EnableARRPreload
- TIM_InitStruct.Autoreload需要设置为最大计数器值
这将使计时器自动复位并为递增计数器提供最大值。对于我的工作,我将其设置为0xFFFF。