老哥们，我用的是STM32F103C6T8，想做一个呼吸灯的程序，但是设置完后，灯是灭的。确实不知道是那里除了问题。

木偶人的感情 · 发表于 2020-4-21 13:42:13

u16 ledOpwmval;
int main(void)
{

u8 dir=1;
delay_init();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
uart_init(115200);
Init_LEDpin();
TIM3_PWM_Init(719,2000);
while(1)
{
      delay_ms(10);
      if(dir == 1) ledOpwmval++;
      else ledOpwmval--;

      if(ledOpwmval>300) dir = 0;
      if(ledOpwmval<=0) dir = 1;
      TIM_SetCompare1(TIM3,ledOpwmval);
}

void TIM3_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStrue;
NVIC_InitTypeDef NVIC_InitStructture;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

TIM_TimeBaseInitStrue.TIM_Period = arr;
TIM_TimeBaseInitStrue.TIM_Prescaler = psc;
TIM_TimeBaseInitStrue.TIM_CounterMode =TIM_CounterMode_Up;
TIM_TimeBaseInitStrue.TIM_ClockDivision =TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStrue);

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);

NVIC_InitStructture.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructture.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructture.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructture.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructture);

TIM_Cmd(TIM3,ENABLE);
}

void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3,TIM_IT_Update)!=RESET)
{
      LED1=!LED1;
      TIM_ClearITPendingBit(TIM3,TIM_IT_Update);
}

}

void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStrue;
TIM_OCInitTypeDef TIM_OCInitTypeStrue;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;    // ¶Ë¿úÅäÖÃ
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    //IO¿úËù¶èÎa50MHz
   GPIO_Init(GPIOA, &GPIO_InitStructure);

TIM_TimeBaseInitStrue.TIM_Period = arr;
TIM_TimeBaseInitStrue.TIM_Prescaler = psc;
TIM_TimeBaseInitStrue.TIM_CounterMode =TIM_CounterMode_Up;
TIM_TimeBaseInitStrue.TIM_ClockDivision =TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStrue);

TIM_OCInitTypeStrue.TIM_OCMode =TIM_OCMode_PWM2;
TIM_OCInitTypeStrue.TIM_OCNPolarity =TIM_OCPolarity_High;
TIM_OCInitTypeStrue.TIM_OutputState =TIM_OutputState_Enable;
TIM_OC1Init(TIM3,&TIM_OCInitTypeStrue);
TIM_OCInitTypeStrue.TIM_Pulse = 0; //????\\\\

TIM_OC1PreloadConfig(TIM3,TIM_OCPreload_Enable);

TIM_Cmd(TIM3,ENABLE);
}
希望老哥们多多指教，感激不尽。

萌新一名 · 发表于 2020-4-21 16:22:47

int main(void)
{
u16 led0pwmval=0;
u8 dir=1;
delay_init();            //延时函数初始化
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);    //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
uart_init(115200);    //串口初始化为115200
LED_Init();       //LED端口初始化
TIM3_PWM_Init(899,0);    //不分频。PWM频率=72000000/900=80Khz
   while(1)
{
delay_ms(10);
if(dir)led0pwmval++;
else led0pwmval--;

if(led0pwmval>900)dir=0;
if(led0pwmval==0)dir=1;
TIM_SetCompare2(TIM3,500); //  PA6用TIM_SetCompare1(TIM3,值)

A7用TIM_SetCompare2(TIM3,值);
TIM_SetCompare1(TIM3,led0pwmval);
}
}
void TIM3_Int_Init(u16 arr,u16 psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能

TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值    计数到5000为500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值  10Khz的计数频率
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure);  //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

TIM_Cmd(TIM3, ENABLE);  //使能TIMx外设

}
//定时器3中断服务程序
void TIM3_IRQHandler(void) //TIM3中断
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  //清除TIMx的中断待处理位:TIM 中断源
LED1=!LED1;
}
}

//TIM3 PWM部分初始化
//PWM输出初始化
//arr：自动重装值
//psc：时钟预分频数
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定时器3时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA  | RCC_APB2Periph_AFIO, ENABLE);  //使能GPIO外设和AFIO复用功能模块时钟

GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, DISABLE); //

//设置该引脚为复用输出功能,输出TIM3 CH2的PWM脉冲波形 GPIOB.5
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIO

//初始化TIM3
TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

//初始化TIM3 Channel2 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OC2Init(TIM3, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC2
TIM_OC1Init(TIM3, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC2

TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能TIM3在CCR2上的预装载寄存器
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能TIM3在CCR2上的预装载寄存器
TIM_Cmd(TIM3, ENABLE);  //使能TIM3
}
昨天刚改的PA6、A7没有问题