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我用的CPU是STM32F103RBT6，库的版本是3.4.0，我现在的程序能运行，但是我不知道为什么在我的PA1脚没有接输入频率的时候却一直在有数据，而且数据不是固定的，输入捕捉在没有频率输入的时候应该是0吧？！我只上传两组数据举例一下如下所示： DutyCycle1 64 Frequency1 1651 capture2 43607 capture3 28322 capture4 56304 DutyCycle1 56 Frequency1 1661 capture2 43334 capture3 50192 capture4 24343 还有一个问题就是为什么我用的是定时器输出比较模式产生PWM，却不是我计算的值呢!?TIM_Period =65535,TIM_Prescaler=5,TIM_Pulse = zhankongbi4=600;却产生的10k频率的方波（示波器看的），而且为什么改变了TIM_Pulse 的值，输出的频率就会改变呢？！正常不是应该改变TIM_Period 和TIM_Prescaler值嘛？！定时器输出比较模式的频率计算到底是怎么回事呢？我的systemclock选择的72M！ 求高手指点一下，先贴上我的代码，main.c函数 #include "stm32f10x.h" #include TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TimOCInitStructure; TIM_ICInitTypeDef TIM_ICInitStructure; void RCC_cfg(); void GPIO_cfg(); void TIME3_PWM_cfg(); void TIME2_cfg(); void NVIC_cfg(); u16 Frequency1; u16 DutyCycle1; vu16 zhankongbi4=600; //600->10k int main() { RCC_cfg(); GPIO_cfg(); NVIC_cfg(); TIME2_cfg(); TIME3_PWM_cfg(); while(1) { } } void GPIO_cfg() { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3|RCC_APB1Periph_TIM2,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_GPIOB |RCC_APB2Periph_GPIOC| RCC_APB2Periph_AFIO,ENABLE); //CH2 TIM2 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA,&GPIO_InitStructure); // CH4 TIM3 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(GPIOB,&GPIO_InitStructure); //LED GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOC,&GPIO_InitStructure); } void TIME3_PWM_cfg() { TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision =0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_Period = 65535; TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure); TIM_PrescalerConfig(TIM3,5,TIM_PSCReloadMode_Immediate); TIM_OCStructInit(&TimOCInitStructure); TimOCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; TimOCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TimOCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TimOCInitStructure.TIM_Pulse = zhankongbi4; TIM_OC4Init(TIM3, &TimOCInitStructure); TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Disable); TIM_ITConfig(TIM3, TIM_IT_CC4, ENABLE); TIM_Cmd(TIM3, ENABLE); } void TIME2_cfg() { TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision =0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseStructure.TIM_Period =65535; TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure); TIM_PrescalerConfig(TIM2,5,TIM_PSCReloadMode_Immediate); TIM_ICInitStructure.TIM_Channel =TIM_Channel_2; TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; TIM_ICInitStructure.TIM_ICFilter = 0x0; TIM_ICInit(TIM2, &TIM_ICInitStructure); TIM_PWMIConfig(TIM2, &TIM_ICInitStructure); TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2); TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset); TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable); TIM_ITConfig(TIM2, TIM_IT_CC2, ENABLE); TIM_Cmd(TIM2, ENABLE); } void NVIC_cfg() { NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } void RCC_cfg() { ErrorStatus HSEStartUpStatus; RCC_DeInit(); RCC_HSEConfig(RCC_HSE_ON); HSEStartUpStatus = RCC_WaitForHSEStartUp(); if(HSEStartUpStatus == SUCCESS) { RCC_HCLKConfig(RCC_SYSCLK_Div1); RCC_PCLK2Config(RCC_HCLK_Div1); RCC_PCLK1Config(RCC_HCLK_Div2); FLASH_SetLatency(FLASH_Latency_2); FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9); RCC_PLLCmd(ENABLE); while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) {} RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); while(RCC_GetSYSCLKSource() != 0x08) {} } } stm32f10x_it.c中断函数 #include "stm32f10x_it.h" extern u16 Frequency1; extern u16 DutyCycle1; extern vu16 zhankongbi4; u16 capture2; u16 capture3; u16 capture4; void TIM3_IRQHandler(void) { if (TIM_GetITStatus(TIM3, TIM_IT_CC4) != RESET) { TIM_ClearITPendingBit(TIM3, TIM_IT_CC4); GPIO_WriteBit(GPIOB,GPIO_Pin_1,(BitAction)(1-GPIO_ReadOutputDataBit(GPIOB,GPIO_Pin_1))); capture4=TIM_GetCapture4(TIM3); TIM_SetCompare4(TIM3, capture4+zhankongbi4); } } void TIM2_IRQHandler(void) { if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET) { TIM_ClearITPendingBit(TIM2, TIM_IT_CC2); capture2=TIM_GetCapture2(TIM2); capture3=TIM_GetCapture1(TIM2); if(capture2 != 0) { DutyCycle1= (TIM_GetCapture1(TIM2) * 100) / capture2; Frequency1 = 72000000 / capture2; } else { DutyCycle1 = 0; Frequency1 = 0;} } } |
