战舰的板子，使用Tim3输出pwm时，全映像时是正常的，部分映像只有PB5输出pwm，是怎么回事啊

qiaoqiaoa · 发表于 2021-7-28 23:27:21

void 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_GPIOB  | RCC_APB2Periph_AFIO, ENABLE);  //使能GPIO外设和AFIO复用功能模块时钟

GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射
// GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE); //Timer3全重映射

  //设置该引脚为复用输出功能
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_4|GPIO_Pin_5;//GPIO_Pin_4|GPIO_Pin_0|GPIO_Pin_1|
GPIO_Init(GPIOB, &GPIO_InitStructure);

//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

//
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_OC1Init(TIM3, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC3
TIM_OC2Init(TIM3, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC3
TIM_OC3Init(TIM3, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC3
TIM_OC4Init(TIM3, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC3
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能TIM3在CCR3上的预装载寄存器
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能TIM3在CCR3上的预装载寄存器
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能TIM3在CCR3上的预装载寄存器
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能TIM3在CCR3上的预装载寄存器

TIM_Cmd(TIM3, ENABLE);  //使能TIM3

}

//10ms调用一次，产生呼吸灯效果

u16 led0pwmval=50;
u8 CStatus=0;
void PwmDuteChange(void){
switch(CStatus){
case 0:
if(++led0pwmval>=100){
CStatus=1;
}
break;
default:
if(--led0pwmval<=0){
CStatus=0;
}
break;
}
TIM_SetCompare1(TIM3,led0pwmval);
TIM_SetCompare2(TIM3,led0pwmval);
TIM_SetCompare3(TIM3,led0pwmval);
TIM_SetCompare4(TIM3,led0pwmval);
}