PWM代码问起求助

PsychoZy · 发表于 2017-8-11 01:58:54

我这配置两路PWM输出的代码哪里也有问题啊？求助

[mw_shl_code=applescript,true] GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO,ENABLE);
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3,ENABLE);//开启部分重映射

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;//初始化PB.5
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5|GPIO_Pin_4;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);

TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;//配置定时器
TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_Prescaler=psc;
TIM_TimeBaseInitStructure.TIM_Period=arr;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2;//输出模时2,计数值比比较值小时为无效电平
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//输出极性高电平有效
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;//比较输出使能
TIM_OC2Init(TIM3,&TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM3,TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2;//输出模时2,计数值比比较值小时为无效电平
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//输出极性高电平有效
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;//比较输出使能
TIM_OC1Init(TIM3,&TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM3,TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM3,ENABLE);//预装载寄存器立即生效

TIM_Cmd(TIM3,ENABLE);
}[/mw_shl_code]

正点原子 · 发表于 2017-8-11 01:58:55

要用PB3，PB4，你得先禁止JTAG

学霸猫 · 发表于 2017-8-11 08:50:27

主函数贴出来看看

NPNcmos · 发表于 2017-8-11 10:56:52

TIM_CtrlPWMOutputs()把这个函数加到配置函数最后面，应该就可以输出波形了。

wxjhby · 发表于 2017-8-11 11:11:39

NPNcmos 发表于 2017-8-11 10:56
TIM_CtrlPWMOutputs()把这个函数加到配置函数最后面，应该就可以输出波形了。

这个函数只和高级定时器有关
[mw_shl_code=c,true]/**
  * @brief  Enables or disables the TIM peripheral Main Outputs.
  * @param  TIMx: where x can be 1, 8, 15, 16 or 17 to select the TIMx peripheral.
  * @param  NewState: new state of the TIM peripheral Main Outputs.
  * This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void TIM_CtrlPWMOutputs(TIM_TypeDef* TIMx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_TIM_LIST2_PERIPH(TIMx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
/* Enable the TIM Main Output */
TIMx->BDTR |= TIM_BDTR_MOE;
  }
  else
  {
/* Disable the TIM Main Output */
TIMx->BDTR &= (uint16_t)(~((uint16_t)TIM_BDTR_MOE));
  }
}[/mw_shl_code]