新手求助，STM32 TIM 输出PWM 50HZ问题

86stonep

[mw_shl_code=c,true]小弟是新手，刚刚入门，想用TIM3通过PC6输出50K HZ的,并以TIM3为主，以TIM4为次 通过PB6输出50HZ的PWM 下面的代码 用示波器看了下，PC6有50KHZ，PB6一直为高， 是什么原因，请教各位！ int main(void) { TIM_Config(); PrescalerValue = (uint16_t) 72 -1 ; /*--------------------------------Slave----------------------------------------*/ /* Time base configuration */ TIM_TimeBaseStructure.TIM_Period = 1000 ; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); /* PWM1 Mode configuration: Channel1 */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = 500; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC1Init(TIM4, &TIM_OCInitStructure); TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Gated); TIM_SelectInputTrigger(TIM4, TIM_TS_ITR0); /*------------------------------MASTER------------------------------------------*/ /* Time base configuration */ TIM_TimeBaseStructure.TIM_Period = 22 ; TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); /* PWM1 Mode configuration: Channel1 */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = 10; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OC1Init(TIM3, &TIM_OCInitStructure); TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); /* Master Mode selection */ TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update); /* Select the Master Slave Mode */ TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable); /* TIM3 enable counter */ TIM_Cmd(TIM3, ENABLE); TIM_Cmd(TIM4, ENABLE); while (1) {} } void TIM_Config(void) { GPIO_InitTypeDef GPIO_InitStructure; /* TIM3 clock enable */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 | RCC_APB1Periph_TIM4, ENABLE); /* GPIOC and GPIOB clock enable */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOB, ENABLE); /* GPIOC Configuration: TIM3 CH1 (PC6) */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 ; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ; GPIO_Init(GPIOC, &GPIO_InitStructure); /* GPIOC Configuration: TIM3 CH1 (PB6) */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; GPIO_Init(GPIOB, &GPIO_InitStructure); /* Connect TIM3 pins to AF2 */ GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_TIM3); GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_TIM4); }[/mw_shl_code]

正点原子

建议：软件仿真，看下寄存器配置，是否有差异。然后找问题在哪里。
另外，你这是F4么？