STM32 PWM总结

分手后的思念是犯贱 2022-08-13 19:58 156阅读 0赞

一、配置完成之后

二、

1、主函数

int main(void)  
\{  
u16 InitValue,Pre\_Divide;  
u16 CCR1\_Val = 500;  
u16 CCR2\_Val = 375;  
u16 CCR3\_Val = 250;  
u16 CCR4\_Val = 125;  
InitValue=1000;         //初值1000  
Pre\_Divide=1;             //预分频1  
   
  SystemInit();//系统时钟配置，重要不能丢  
  TIM3\_GPIO\_Config();//管脚配置。  
  TIM3\_Mode\_Config(InitValue, Pre\_Divide,  CCR1\_Val, CCR2\_Val, CCR3\_Val, CCR4\_Val);//TIMX配置  
  while (1)\{\}  
 \}

void TIM3\_GPIO\_Config(void)  
\{ GPIO\_InitTypeDef  GPIO\_InitStruct;  
    RCC\_APB2PeriphClockCmd(RCC\_APB2Periph\_GPIOA | RCC\_APB2Periph\_GPIOB, ENABLE);//使能GPIOA GPIOB TIM1 外设时钟  
    GPIO\_InitStruct.GPIO\_Pin = GPIO\_Pin\_6|GPIO\_Pin\_7;  
    GPIO\_InitStruct.GPIO\_Mode =  GPIO\_Mode\_AF\_PP;  
GPIO\_InitStruct.GPIO\_Speed = GPIO\_Speed\_50MHz;  
GPIO\_Init(GPIOA,&GPIO\_InitStruct);  
GPIO\_InitStruct.GPIO\_Pin =GPIO\_Pin\_0|GPIO\_Pin\_1;  
    GPIO\_Init(GPIOB,&GPIO\_InitStruct);  
  
\}//注意第一行 结构体声明必须有；第二行使能GPIOA GPIOB TIM1 是在APB2上，但是2、3、4Tim是在APB1上。外设时钟必须有，没有也错。

另外，Tim3四个通道的管脚是固定的，若不用这几个规定的管脚，必须要使用映射才能使用别的管脚

void TIM3\_Mode\_Config(u16 InitValue, u16 Pre\_Divide, u16 CCR1\_Val,u16 CCR2\_Val,u16 CCR3\_Val,u16 CCR4\_Val)  
\{  
  
  
TIM\_TimeBaseInitTypeDef TIM\_TimeBaseStructure;  
TIM\_OCInitTypeDef TIM\_OCInitStructure;  
TIM\_DeInit(TIM3);  
RCC\_APB1PeriphClockCmd(RCC\_APB1Periph\_TIM3, ENABLE);   //很重要，位置也很重要  
/\* Time base configuration \*/  
TIM\_TimeBaseStructure.TIM\_Period = InitValue;  
TIM\_TimeBaseStructure.TIM\_Prescaler = Pre\_Divide-1;  
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 = CCR1\_Val;  
TIM\_OCInitStructure.TIM\_OCPolarity = TIM\_OCPolarity\_High;  
TIM\_OC1Init(TIM3, &TIM\_OCInitStructure);  
TIM\_OC1PreloadConfig(TIM3, TIM\_OCPreload\_Enable);  
/\* PWM1 Mode configuration: Channel2 \*/  
TIM\_OCInitStructure.TIM\_OutputState = TIM\_OutputState\_Enable;  
TIM\_OCInitStructure.TIM\_Pulse = CCR2\_Val;  
TIM\_OC2Init(TIM3, &TIM\_OCInitStructure);  
TIM\_OC2PreloadConfig(TIM3, TIM\_OCPreload\_Enable);  
/\* PWM1 Mode configuration: Channel3 \*/  
TIM\_OCInitStructure.TIM\_OutputState = TIM\_OutputState\_Enable;  
TIM\_OCInitStructure.TIM\_Pulse = CCR3\_Val;  
TIM\_OC3Init(TIM3, &TIM\_OCInitStructure);  
TIM\_OC3PreloadConfig(TIM3, TIM\_OCPreload\_Enable);  
/\* PWM1 Mode configuration: Channel4 \*/  
TIM\_OCInitStructure.TIM\_OutputState = TIM\_OutputState\_Enable;  
TIM\_OCInitStructure.TIM\_Pulse = CCR4\_Val;  
TIM\_OC4Init(TIM3, &TIM\_OCInitStructure);  
TIM\_OC4PreloadConfig(TIM3, TIM\_OCPreload\_Enable);  
TIM\_ARRPreloadConfig(TIM3, ENABLE);  
/\* TIM3 enable counter \*/  
TIM\_Cmd(TIM3, ENABLE);  
 \}

特别要注意一点是外设时钟设置RCC的总线、以及位置。像管脚、TIM都是外设，必须要有外设时钟。

最后终于如愿得到结果：

![20141113111004175][]

[20141113111004175]: /images/20220810/2463f5de50c741c390999435995c289c.png