STM32F0产生PWM问题

只看该作者 · 2012-7-16 20:59

之前产生PWM是正常的，但是加了NVIC配置以后，就不产生PWM波形了，大侠知道怎么回事吗？

#include "stm32f0xx.h"
#include "stm32f0_discovery.h"

void TIM_Config(void);
void NVIC_Configuration(void);

int main(void)
{
  NVIC_Configuration();
  TIM_Config();
  STM_EVAL_LEDInit(LED3);
  while (1)
  {}
}
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  NVIC_InitStructure.NVIC_IRQChannel = TIM1_BRK_UP_TRG_COM_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}
void TIM_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  /* GPIOA Clocks enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

  /* GPIOA Configuration: Channel 1 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 ;
  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_PinSource8, GPIO_AF_2);

  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
/* TIM1 clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);

  /* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = (SystemCoreClock/1000)-1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up ; TIM_TimeBaseStructure.TIM_Period = 2000-1;  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  /* Channel 1, 2, 3 and 4 Configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_Pulse = 500;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);
  /* TIM1 counter enable */
  TIM_Cmd(TIM1, ENABLE);
  /* TIM1 Main Output Enable */
  TIM_CtrlPWMOutputs(TIM1, ENABLE);

//  TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
//  TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE );
//  TIM_ARRPreloadConfig(TIM1, ENABLE);
}

只看该作者 · 2012-7-16 21:00

就是多了 NVIC_Configuration();这个函数，他就不产生PWM了，但是这句话注释掉又正常了，其他都没变。