[问答]

STM32F051使用PWM互补输出N极起始异常的原因？怎么解决？

问答对人有帮助，内容完整，我也想知道答案 0 用了tiM1的1~3通道的PWM互补输出，发现每次调用TIM_SelectOCxM和TIM_CCxCmd后N极总会有一个1个多微秒的有效电平出来。初始代码： nvicInitTypeDef.NVIC_IRQChannel = TIM1_CC_IRQn;//选择定时器1比较中断向量 nvicInitTypeDef.NVIC_IRQChannelCmd = ENABLE;//使能中断 nvicInitTypeDef.NVIC_IRQChannelPriority = 1;//设置中断优先级 NVIC_Init( nvicInitTypeDef);//初始化中断向量 timeBaseInitTypeDef.TIM_ClockDivision = TIM_CKD_DIV1;//设置定时器分频 timeBaseInitTypeDef.TIM_CounterMode = TIM_CounterMode_Up;//设置定时器计数方向 timeBaseInitTypeDef.TIM_Period = 0xffff;//设置计数周期 timeBaseInitTypeDef.TIM_Prescaler = 0;//设置预分频 timeBaseInitTypeDef.TIM_RepetitionCounter = 0;//设置重复计数数 TIM_TimeBaseInit(TIM1, timeBaseInitTypeDef);//根据结构体初始化 TIM_ARRPreloadConfig(TIM1, ENABLE); timeOcInitTypeDef.TIM_OCIdleState = TIM_OCIdleState_Reset; timeOcInitTypeDef.TIM_OCMode = TIM_OCMode_Timing;//使用定时模式，输出端口不受影响 timeOcInitTypeDef.TIM_OCNIdleState = TIM_OCIdleState_Reset; timeOcInitTypeDef.TIM_OCNPolarity = TIM_OCNPolarity_High; timeOcInitTypeDef.TIM_OutputNState = TIM_OutputNState_Disable; timeOcInitTypeDef.TIM_OutputState = TIM_OutputState_Enable; timeOcInitTypeDef.TIM_Pulse = 10000 - 1;//选择脉冲数 TIM_OC4Init(TIM1, timeOcInitTypeDef);//调用初始化函数，初始化通道4 //PA7-TIM1_CC1+ U- //PA8-TIM1_CC1- U+ //PA9-TIM1_CC2+ V+ //PB0-TIM1_CC2- V- //PA10-TIM1_CC3+ W+ //PB1-TIM1_CC3- W- gpioInitTypeDef.GPIO_Mode = GPIO_Mode_AF;//复用模式，调试的时候用的GPIO_Mode_OUT,浪费了2个小时，一直搞到凌晨1:40，正是个大乌龙！ gpioInitTypeDef.GPIO_OType = GPIO_OType_PP; gpioInitTypeDef.GPIO_Pin = GPIO_Pin_7 \| GPIO_Pin_8 \| GPIO_Pin_9 \| GPIO_Pin_10; gpioInitTypeDef.GPIO_PuPd = GPIO_PuPd_NOPULL; gpioInitTypeDef.GPIO_Speed = GPIO_Speed_Level_3; GPIO_Init(GPIOA, gpioInitTypeDef); gpioInitTypeDef.GPIO_Mode = GPIO_Mode_AF;//复用模式，调试的时候用的GPIO_Mode_OUT,浪费了2个小时，一直搞到凌晨1:40，正是个大乌龙！ gpioInitTypeDef.GPIO_OType = GPIO_OType_PP; gpioInitTypeDef.GPIO_Pin = GPIO_Pin_0 \| GPIO_Pin_1; gpioInitTypeDef.GPIO_PuPd = GPIO_PuPd_NOPULL; gpioInitTypeDef.GPIO_Speed = GPIO_Speed_Level_3; GPIO_Init(GPIOB, gpioInitTypeDef); //TIM1复用模式要选GPIO_AF_2，不要选GPIO_AF_0,虽然库注释里GPIO_AF_0也有TIM1 GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2);//0);//选择GPIOA7为复用0，TIM1 GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_2);//0);//选择GPIOA8为复用0，TIM1 GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_2);//0);//选择GPIOA9为复用0，TIM1 GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_2);//0);//选择GPIOA10为复用0，TIM1 GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_2);//0);//选择GPIOA7为复用0，TIM1 GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_2);//0);//选择GPIOA8为复用0，TIM1 timeOcInitTypeDef.TIM_OCIdleState = TIM_OCIdleState_Reset; timeOcInitTypeDef.TIM_OCMode = TIM_OCMode_PWM1;// timeOcInitTypeDef.TIM_OCNIdleState = TIM_OCIdleState_Set;//Reset; timeOcInitTypeDef.TIM_OCNPolarity = TIM_OCNPolarity_High; timeOcInitTypeDef.TIM_OutputNState = TIM_OutputNState_Enable; timeOcInitTypeDef.TIM_OutputState = TIM_OutputState_Enable; timeOcInitTypeDef.TIM_OCPolarity = TIM_OCPolarity_High; timeOcInitTypeDef.TIM_Pulse = 10000;//选择脉冲数 TIM_OC1Init(TIM1, timeOcInitTypeDef); TIM_OC2Init(TIM1, timeOcInitTypeDef); TIM_OC3Init(TIM1, timeOcInitTypeDef); TIM_ITConfig(TIM1, TIM_IT_CC4, ENABLE);//使能第四通道比较中断 TIM_Cmd(TIM1, ENABLE);//使能定时器1 TIM_CtrlPWMOutputs(TIM1, ENABLE); 复制代码在比较中断中轮流使能TIM1的CC1、CC2、CC3的PWM输出。 /** * @brief 定时器1比较中断函数 * @} / void TIM1_CC_IRQHandler(void) { if(SET == TIM_GetITStatus(TIM1, TIM_IT_CC4)) { TIM_ClearITPendingBit(TIM1, TIM_IT_CC4); switch(g_u32_pwm_select_cnt) { case 0: { TIM_ForcedOC2Config(TIM1, TIM_ForcedAction_InActive); TIM_ForcedOC3Config(TIM1, TIM_ForcedAction_InActive); TIM_SelectOCxM(TIM1, TIM_Channel_1, TIM_OCMode_PWM1); TIM_CCxCmd(TIM1, TIM_Channel_1, ENABLE); } break; case 1: { TIM_ForcedOC1Config(TIM1, TIM_ForcedAction_InActive); TIM_ForcedOC3Config(TIM1, TIM_ForcedAction_InActive); TIM_SelectOCxM(TIM1, TIM_Channel_2, TIM_OCMode_PWM1); TIM_CCxCmd(TIM1, TIM_Channel_2, ENABLE); } break; case 2: { TIM_ForcedOC1Config(TIM1, TIM_ForcedAction_InActive); TIM_ForcedOC2Config(TIM1, TIM_ForcedAction_InActive); TIM_SelectOCxM(TIM1, TIM_Channel_3, TIM_OCMode_PWM1); TIM_CCxCmd(TIM1, TIM_Channel_3, ENABLE); } break; case 3: { TIM_ForcedOC2Config(TIM1, TIM_ForcedAction_InActive); TIM_ForcedOC3Config(TIM1, TIM_ForcedAction_InActive); TIM_ForcedOC1Config(TIM1, TIM_ForcedAction_InActive); //TIM_CtrlPWMOutputs(TIM1, DISABLE); } break; } if(g_u32_pwm_select_cnt < 3) { g_u32_pwm_select_cnt ++; } else { g_u32_pwm_select_cnt = 0; } } } 0 本主题由 Harmony技术专家于 2024-4-24 15:47 审核通过*
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