香主，请教下STM32103的定时器输出不同频率的PWM的问题

只看该作者 · 2012-6-5 15:59

本帖最后由 yuluyiyi 于 2012-6-8 09:57 编辑

用的ST固件库的例程，想用TIM1实现四路占空比为50%，频率可调的脉冲输出，发现在TIM3下可以实现四路PWM输出，但是改成TIM1就不行了，难道实现同样的功能定时器的配置有所不同么？
代码如下：
int main(void)
{
RCC_Configuration();
  /* NVIC Configuration */
  NVIC_Configuration();
/* GPIO Configuration */
  GPIO_Configuration();
/* Compute the prescaler value */
  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 65535;
  TIM_TimeBaseStructure.TIM_Prescaler = 29;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
  /* Output Compare Toggle Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);
  TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Disable);
/* Output Compare Toggle Mode configuration: Channel2 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
  TIM_OC2Init(TIM1, &TIM_OCInitStructure);
  TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Disable);
  /* Output Compare Toggle Mode configuration: Channel3 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR3_Val;
  TIM_OC3Init(TIM1, &TIM_OCInitStructure);
  TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Disable);
  /* Output Compare Toggle Mode configuration: Channel4 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
  TIM_OC4Init(TIM1, &TIM_OCInitStructure);
  TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Disable);
  /* TIM enable counter */
  TIM_Cmd(TIM1, ENABLE);
  /* TIM IT enable */
  TIM_ITConfig(TIM1， TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);
  while (1)
  {}
}