蓝桥杯嵌入式STM32定时器PWM输出、PWM捕获 STM32

这里以stm32F103RBT6为例

单个定时器输出多路相同频率不同占空比的方波

void TIM2_PWM_Init(void) { TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure; TIM_OCInitTypeDefTIM_OCInitStructure; GPIO_InitTypeDef GPIO_InitStructure; uint16_t PrescalerValue = https://www.it610.com/article/0; uint16_t CCR1_Val = 500; /* TIM2 clock enable */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); /* GPIOAclock enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); GPIO_InitStructure.GPIO_Pin =GPIO_Pin_1|GPIO_Pin_2; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); /* Compute the prescaler value */ PrescalerValue = (uint16_t) (SystemCoreClock / 1000000) - 1; /* Time base configuration */ TIM_TimeBaseStructure.TIM_Period = 1000 - 1; TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); /* PWM1 Mode configuration: Channel2 */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = CCR1_Val; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC2Init(TIM2, &TIM_OCInitStructure); TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable); /* PWM1 Mode configuration: Channel3 */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = CCR1_Val; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC3Init(TIM2, &TIM_OCInitStructure); TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable); TIM_ARRPreloadConfig(TIM2, ENABLE); /* TIM2 enable counter */ TIM_Cmd(TIM2, ENABLE); }TIM_SetAutoreload(TIM2,1000 - 1); //设置TIM2的重载值，PWM频率1kHZ TIM_SetCompare2(TIM2,500); //设置占空比，50% TIM_SetCompare3(TIM2,100); //设置占空比，10%

单个定时器输出多路不同频率不同占空比的方波

__IO uint16_t TIM2_CCR2_Val = 8192; __IO uint16_t TIM2_CCR3_Val = 4096; void TIM2_PWM_OCToggle(void) { NVIC_InitTypeDef NVIC_InitStructure; TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure; TIM_OCInitTypeDefTIM_OCInitStructure; GPIO_InitTypeDef GPIO_InitStructure; uint16_t PrescalerValue = https://www.it610.com/article/0; /* System Clocks Configuration */ /* TIM2 clock enable */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); /* GPIOA clock enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB| RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE); /* NVIC Configuration */ /* Enable the TIM2 global Interrupt */ 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); /* GPIO Configuration */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); /* --------------------------------------------------------------------------- TIM2 Configuration: Output Compare Toggle Mode: TIM2CLK = SystemCoreClock / 2, The objective is to get TIM2 counter clock at 12 MHz: - Prescaler = (TIM2CLK / TIM2 counter clock) - 1 CC1 update rate = TIM2 counter clock / CCR1_Val = 366.2 Hz CC2 update rate = TIM2 counter clock / CCR2_Val = 732.4 Hz CC3 update rate = TIM2 counter clock / CCR3_Val = 1464.8 Hz CC4 update rate = TIM2 counter clock / CCR4_Val = 2929.6 Hz ----------------------------------------------------------------------------*/ /* Compute the prescaler value */ PrescalerValue = (uint16_t) (SystemCoreClock / 24000000) - 1; /* Time base configuration */ TIM_TimeBaseStructure.TIM_Period = 65535; TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); /* Output Compare Toggle Mode configuration: Channel2 */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = TIM2_CCR2_Val; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; TIM_OC2Init(TIM2, &TIM_OCInitStructure); TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Disable); /* Output Compare Toggle Mode configuration: Channel3 */ TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = TIM2_CCR3_Val; TIM_OC3Init(TIM2, &TIM_OCInitStructure); TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Disable); /* TIM enable counter */ TIM_Cmd(TIM2, ENABLE); /* TIM IT enable */ TIM_ITConfig(TIM2, TIM_IT_CC2 | TIM_IT_CC3 , ENABLE); }uint16_t TIM2_capture = 0; _Bool TIM2_CH2_flag=0, TIM2_CH3_flag=0; float TIM2_CH2_duty=0.3, TIM2_CH3_duty=0.7; void TIM2_IRQHandler(void) { /* TIM2_CH2 toggling with frequency = 732.4 Hz */ if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET) { TIM_ClearITPendingBit(TIM2, TIM_IT_CC2 ); TIM2_capture = TIM_GetCapture2(TIM2); if(TIM2_CH2_flag==1) { TIM_SetCompare2(TIM2, TIM2_capture + (u16)(TIM2_CCR2_Val*TIM2_CH2_duty)); TIM2_CH2_flag=0; } else { TIM_SetCompare2(TIM2, TIM2_capture + (u16)(TIM2_CCR2_Val*(1-TIM2_CH2_duty))); TIM2_CH2_flag=1; } }/* TIM2_CH3 toggling with frequency = 1464.8 Hz */ if (TIM_GetITStatus(TIM2, TIM_IT_CC3) != RESET) { TIM_ClearITPendingBit(TIM2, TIM_IT_CC3); TIM2_capture = TIM_GetCapture3(TIM2); if(TIM2_CH3_flag==1) { TIM_SetCompare3(TIM2, TIM2_capture + (u16)(TIM2_CCR3_Val*TIM2_CH3_duty)); TIM2_CH3_flag=0; } else { TIM_SetCompare3(TIM2, TIM2_capture + (u16)(TIM2_CCR3_Val*(1-TIM2_CH3_duty))); TIM2_CH3_flag=1; } } }

单个定时器捕获多路不同频率的方波

void TIM3_Input_Mode_Init(void) { NVIC_InitTypeDef NVIC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; TIM_ICInitTypeDefTIM_ICInitStructure; /* TIM3 clock enable */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); /* GPIOA and GPIOB clock enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); /* Enable the TIM3 global Interrupt */ NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); /* TIM3 channel 2 pin (PA.07) configuration */ GPIO_InitStructure.GPIO_Pin =GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); /* TIM3 configuration: Input Capture mode --------------------- The external signal is connected to TIM3 CH2 pin (PA.07) The Rising edge is used as active edge, The TIM3 CCR2 is used to compute the frequency value ------------------------------------------------------------ */ 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(TIM3, &TIM_ICInitStructure); TIM_ICInitStructure.TIM_Channel = TIM_Channel_1; TIM_ICInit(TIM3, &TIM_ICInitStructure); /* TIM enable counter */ TIM_Cmd(TIM3, ENABLE); /* Enable the CC1 / CC2 Interrupt Request */ TIM_ITConfig(TIM3,TIM_IT_CC1|TIM_IT_CC2, ENABLE); }__IO uint16_t TIM3_CH2_ReadValue1 = 0, TIM3_CH2_ReadValue2 = 0; __IO uint16_t TIM3_CH2_CaptureNumber = 0; __IO uint32_t TIM3_CH2_Capture = 0; __IO uint32_t TIM3_CH2_Freq = 0; __IO uint16_t TIM3_CH1_ReadValue1 = 0, TIM3_CH1_ReadValue2 = 0; __IO uint16_t TIM3_CH1_CaptureNumber = 0; __IO uint32_t TIM3_CH1_Capture = 0; __IO uint32_t TIM3_CH1_Freq = 0; void TIM3_IRQHandler(void) { if(TIM_GetITStatus(TIM3, TIM_IT_CC2) == SET) { /* Clear TIM3 Capture compare interrupt pending bit */ TIM_ClearITPendingBit(TIM3, TIM_IT_CC2); if(TIM3_CH2_CaptureNumber == 0) { /* Get the Input Capture value */ TIM3_CH2_ReadValue1 = TIM_GetCapture2(TIM3); TIM3_CH2_CaptureNumber = 1; } else if(TIM3_CH2_CaptureNumber == 1) { /* Get the Input Capture value */ TIM3_CH2_ReadValue2 = TIM_GetCapture2(TIM3); /* Capture computation */ if (TIM3_CH2_ReadValue2 > TIM3_CH2_ReadValue1) { TIM3_CH2_Capture = (TIM3_CH2_ReadValue2 - TIM3_CH2_ReadValue1); } else { TIM3_CH2_Capture = ((0xFFFF - TIM3_CH2_ReadValue1) + TIM3_CH2_ReadValue2); } /* Frequency computation */ TIM3_CH2_Freq = (uint32_t) SystemCoreClock / TIM3_CH2_Capture; TIM3_CH2_CaptureNumber = 0; } }if(TIM_GetITStatus(TIM3, TIM_IT_CC1) == SET) { /* Clear TIM3 Capture compare interrupt pending bit */ TIM_ClearITPendingBit(TIM3, TIM_IT_CC1); if(TIM3_CH1_CaptureNumber == 0) { /* Get the Input Capture value */ TIM3_CH1_ReadValue1 = TIM_GetCapture1(TIM3); TIM3_CH1_CaptureNumber = 1; } else if(TIM3_CH1_CaptureNumber == 1) { /* Get the Input Capture value */ TIM3_CH1_ReadValue2 = TIM_GetCapture1(TIM3); /* Capture computation */ if (TIM3_CH1_ReadValue2 > TIM3_CH1_ReadValue1) { TIM3_CH1_Capture = (TIM3_CH1_ReadValue2 - TIM3_CH1_ReadValue1); } else { TIM3_CH1_Capture = ((0xFFFF - TIM3_CH1_ReadValue1) + TIM3_CH1_ReadValue2); } /* Frequency computation */ TIM3_CH1_Freq = (uint32_t) SystemCoreClock / TIM3_CH1_Capture; TIM3_CH1_CaptureNumber = 0; } } }

单个定时器捕获多路方波的频率和占空比

void TIM3_Input_Mode_Init(void) { NVIC_InitTypeDef NVIC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; TIM_ICInitTypeDefTIM_ICInitStructure; /* TIM3 clock enable */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); /* GPIOA and GPIOB clock enable */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); /* Enable the TIM3 global Interrupt */ NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); /* TIM3 channel 2 pin (PA.07) configuration */ GPIO_InitStructure.GPIO_Pin =GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); /* TIM3 configuration: Input Capture mode --------------------- The external signal is connected to TIM3 CH2 pin (PA.07) The Rising edge is used as active edge, The TIM3 CCR2 is used to compute the frequency value ------------------------------------------------------------ */ 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(TIM3, &TIM_ICInitStructure); TIM_ICInitStructure.TIM_Channel = TIM_Channel_1; TIM_ICInit(TIM3, &TIM_ICInitStructure); /* TIM enable counter */ TIM_Cmd(TIM3, ENABLE); /* Enable the CC1 / CC2 Interrupt Request */ TIM_ITConfig(TIM3,TIM_IT_CC1|TIM_IT_CC2, ENABLE); }__IO uint16_t TIM3_CH2_ReadValue1 = 0, TIM3_CH2_ReadValue2 = 0; __IO uint16_t TIM3_CH2_CaptureNumber = 0; __IO uint32_t TIM3_CH2_Freq = 0; __IO uint16_t TIM3_CH1_ReadValue1 = 0, TIM3_CH1_ReadValue2 = 0; __IO uint16_t TIM3_CH1_CaptureNumber = 0; __IO uint32_t TIM3_CH1_Freq = 0; u8 TIM3_CH1_Duty, TIM3_CH2_Duty; u8 capture_flag = 1; void TIM3_IRQHandler(void) { if(TIM_GetITStatus(TIM3, TIM_IT_CC2) == SET) { /* Clear TIM3 Capture compare interrupt pending bit */ TIM_ClearITPendingBit(TIM3, TIM_IT_CC2); if(capture_flag == 2) { if(TIM3_CH2_CaptureNumber == 0) { TIM_SetCounter(TIM3, 0); TIM_OC2PolarityConfig(TIM3,TIM_ICPolarity_Falling); TIM3_CH2_CaptureNumber = 1; } else if (TIM3_CH2_CaptureNumber == 1) { /* Get the Input Capture value */ TIM3_CH2_ReadValue1 = TIM_GetCounter(TIM3); TIM_OC2PolarityConfig(TIM3,TIM_ICPolarity_Rising); TIM3_CH2_CaptureNumber = 2; } else if(TIM3_CH2_CaptureNumber == 2) { /* Get the Input Capture value */ TIM3_CH2_ReadValue2 = TIM_GetCounter(TIM3); /* Frequency computation */ TIM3_CH2_Freq = (uint32_t) SystemCoreClock / TIM3_CH2_ReadValue2; TIM3_CH2_Duty = TIM3_CH2_ReadValue1 * 100 / TIM3_CH2_ReadValue2; TIM3_CH2_CaptureNumber = 0; } } }if(TIM_GetITStatus(TIM3, TIM_IT_CC1) == SET) { /* Clear TIM3 Capture compare interrupt pending bit */ TIM_ClearITPendingBit(TIM3, TIM_IT_CC1); if(capture_flag == 1) { if(TIM3_CH1_CaptureNumber == 0) { TIM_SetCounter(TIM3, 0); TIM_OC1PolarityConfig(TIM3,TIM_ICPolarity_Falling); TIM3_CH1_CaptureNumber = 1; } else if (TIM3_CH1_CaptureNumber == 1) { /* Get the Input Capture value */ TIM3_CH1_ReadValue1 = TIM_GetCounter(TIM3); TIM_OC1PolarityConfig(TIM3,TIM_ICPolarity_Rising); TIM3_CH1_CaptureNumber = 2; } else if(TIM3_CH1_CaptureNumber == 2) { /* Get the Input Capture value */ TIM3_CH1_ReadValue2 = TIM_GetCounter(TIM3); /* Frequency computation */ TIM3_CH1_Freq = (uint32_t) SystemCoreClock / TIM3_CH1_ReadValue2; TIM3_CH1_Duty = TIM3_CH1_ReadValue1 * 100 / TIM3_CH1_ReadValue2; TIM3_CH1_CaptureNumber = 0; } } } } //利用滴答定时器进行100ms捕获一个通道 static u16 pwm_capture_count=0; if(++pwm_capture_count==100) { pwm_capture_count=0; capture_flag = capture_flag % 2 + 1; TIM3_CH1_CaptureNumber=0; TIM3_CH2_CaptureNumber=0; }