STM32F030F4P6 PWM无法更改捕获比较寄存器的值，PWM波形无变化

sunp · 发表于 2016-3-29 16:09:48

  void TIM_PWM_Config(void){
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef       TIM_OCInitStructure;
  /* TIM1 时钟使能 */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3  , ENABLE);
/* Time 定时基础设置*/
TIM_TimeBaseStructure.TIM_Prescaler = 1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; /* Time 定时设置为上升沿计算模式*/
TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
//TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

/* 频道 1，2，3，4 的 PWM 模式设置 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
//TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
//TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
//TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
//TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

// TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;//使能频道 1 配置
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
// TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;//使能频道 2 配置
// TIM_OC2Init(TIM1, &TIM_OCInitStructure);

// TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;//使能频道 3 配置
// TIM_OC3Init(TIM1, &TIM_OCInitStructure);

// TIM_OCInitStructure.TIM_Pulse = Channel4Pulse;//使能频道 4 配置
// TIM_OC4Init(TIM1, &TIM_OCInitStructure);
/* TIM1 主输出使能 */
//TIM_CtrlPWMOutputs(TIM3, ENABLE);

TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  //CH1预装载使能

//TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIMx在ARR上的预装载寄存器

/* TIM1 计算器使能*/
TIM_Cmd(TIM3, ENABLE);
}

void TIM3_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* 使能 GPIO 时钟 */
   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* 配置 GPIO 管脚参数设置*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;

GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_1); /* GPIO 管脚复用设置*/
// GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_2);
//GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_2);
}

int main(void)
{
// TIM16_Int_Init(100,4799); //定时10Ms
// TIM3_Int_Init(10000,4799); //定时1s
  //LED_Init();
// delay_init()
uint16_t dir=1,led0pwmval=0;
TIM3_Config();
TIM_PWM_Config();

// IWDG_Init(); //定时1s 需喂狗

  while(1)
  {
delay_ms(10);
if(dir)led0pwmval++;
else led0pwmval--;
if(led0pwmval>3000)dir=0;
if(led0pwmval==0)dir=1;
TIM_SetCompare1(TIM3,led0pwmval);
//TIM_SetAutoreload(TIM3, led0pwmval);
//    Channel1Pulse++;
//IWDG_Feed();

  }
}

原子哥帮我看一下定时器3的通道1 无法更改捕获寄存器的值呢  PWM的波形没有变化