单个通用定时器产生4路频率和占空比都可以调整的 PWM

fighting*_* · 发表于 2014-7-15 11:30:26

实验目的如标题，进行仿真一直是低电平，求解！
实验室采用输出比较时间模式，采用中断，arr设置为65535，当计数到指定值时进行电平翻转,
麻烦原子大哥看下！不知道哪里出了问题，还是少了些什么

[mw_shl_code=c,true]#include "timerpwm4c.h" #include "sys.h" u16 capture = 0; vu16 CCR1_Val = 32768; vu16 CCR2_Val = 16384; vu16 CCR3_Val = 8192; vu16 CCR4_Val = 4096; void TIM3_Int_Init(void) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); TIM_TimeBaseStructure.TIM_Period = 65535; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); TIM_ITConfig(TIM3, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE); 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); TIM_Cmd(TIM3, ENABLE); } void TIM3_IRQHandler(void) { if (TIM_GetITStatus(TIM3, TIM_IT_CC1) != RESET) { TIM_ClearITPendingBit(TIM2, TIM_IT_CC1); capture = TIM_GetCapture1(TIM3); TIM_SetCompare1(TIM3,capture + CCR1_Val); } else if (TIM_GetITStatus(TIM3, TIM_IT_CC2) != RESET) { TIM_ClearITPendingBit(TIM3, TIM_IT_CC2 ); capture = TIM_GetCapture2(TIM3); TIM_SetCompare2(TIM2, capture + CCR2_Val); } else if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET) { TIM_ClearITPendingBit(TIM2, TIM_IT_CC3 ); capture = TIM_GetCapture3(TIM3); TIM_SetCompare3(TIM2, capture + CCR3_Val); } else if (TIM_GetITStatus(TIM3, TIM_IT_CC4) != RESET) { TIM_ClearITPendingBit(TIM2, TIM_IT_CC4 ); capture = TIM_GetCapture4(TIM3); TIM_SetCompare4(TIM3, capture + CCR4_Val); } } void TIM3_PWM_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; uint16_t PrescalerValue = 0; RCC_PCLK1Config(RCC_HCLK_Div4); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC, &GPIO_InitStructure); // u16 CCR1_Val = 40961; // u16 CCR2_Val = 27309; // u16 CCR3_Val = 13654; // u16 CCR4_Val = 6826; /* Compute the prescaler value */ PrescalerValue = (uint16_t) (SystemCoreClock / 12000000) - 1; /* Prescaler configuration */ TIM_PrescalerConfig(TIM3, PrescalerValue, TIM_PSCReloadMode_Immediate); TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = CCR1_Val; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC1Init(TIM3, &TIM_OCInitStructure); TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable); TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = CCR2_Val; TIM_OC2Init(TIM3, &TIM_OCInitStructure); TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Disable); TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = CCR3_Val; TIM_OC3Init(TIM3, &TIM_OCInitStructure); TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Disable); TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = CCR4_Val; TIM_OC4Init(TIM3, &TIM_OCInitStructure); TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Disable); while (1); } [/mw_shl_code]