stm32战舰用TIM定时器3 产生PWM 不知道哪里出了问题请大佬看看

zsc18563653214 · 发表于 2020-4-9 20:12:50

void TIM3_PWM_INIT(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitTypeSture;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitSture;
TIM_OCInitTypeDef TIM_OCInitTypeSture;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); //使能GPIO

//初始化IO口  输出 TIM3 CH1 的 PWM 脉冲波形
GPIO_InitTypeSture.GPIO_Mode= GPIO_Mode_Out_PP; //推挽输出
GPIO_InitTypeSture.GPIO_Pin=GPIO_Pin_6;
GPIO_InitTypeSture.GPIO_Speed= GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitTypeSture);

// TIM3 初始化
TIM_TimeBaseInitSture.TIM_ClockDivision=TIM_CKD_DIV1;//设置时钟分割
TIM_TimeBaseInitSture.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInitSture.TIM_Period=arr; //设置自动重装载寄存器周期的值
TIM_TimeBaseInitSture.TIM_Prescaler=psc;  //设置时钟频率除数的预分频值
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitSture);

//初始化TIM3 通道1 PWM模式
TIM_OCInitTypeSture.TIM_OCMode=TIM_OCMode_PWM2;  //pwm选择模式2
TIM_OCInitTypeSture.TIM_OutputState=TIM_OutputState_Enable; //比较输出使能
TIM_OCInitTypeSture.TIM_OCPolarity=TIM_OCPolarity_High; //输出极性高
TIM_OC1Init(TIM3,&TIM_OCInitTypeSture);
TIM_OC1PreloadConfig(TIM3,TIM_OCPreload_Enable);  //使能预装载寄存器
TIM_Cmd(TIM3,ENABLE);  //使能TIM3
}