定时器分为普通定时器和高级定时器。STM32和GD32都有TIMERX_CHX_ON或者TIMERX_CHXN,这种定时器是一种互补定时器，我们同样可以看到还存在与其名字很像的TIMERX_CHX，TIMERX_CHX，这些都是基本的定时器，按照基本的配置即可产生PWM信号，这里不做介绍 。

下面主要说一下利用互补通道产生PWM信号。

void TIM1_PWM_Init(u16 arr,u16 psc)

{  

GPIO_InitTypeDef GPIO_InitStructure;

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

TIM_OCInitTypeDef  TIM_OCInitStructure;

TIM_BDTRInitTypeDef TIM_BDTRInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, 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

TIM_DeInit(TIM1);

TIM_InternalClockConfig(TIM1);

// GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射  TIM3_CH2->PB5    

 

   //设置该引脚为复用输出功能,输出TIM1 的PWM脉冲波形 GPIOB.13

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; //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(GPIOB, &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(TIM1, &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TIM1 Channel2 PWM模式  

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1 ; //选择定时器模式:TIM脉冲宽度调制模式2

// TIM_OCInitStructure.TIM_Pulse = 0;

  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //输出使能

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高

TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;  //互补输出极性

TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //互补输出使能

TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;  //死区后输出状态

TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set;  //死区后互补输出状态

TIM_OC1Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 OC2

TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1在CCR2上的预装载寄存器

  TIM_OC2Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 OC2

TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1在CCR2上的预装载寄存器

TIM_OC3Init(TIM1, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM1 OC2

TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);  //使能TIM1在CCR2上的预装载寄存器

TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable; //自动输出使能

  TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable; //刹车功能使能

TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_Break_Disable; //刹车输入极性

TIM_BDTRInitStructure.TIM_DeadTime = 36; //死区时间设置

TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF; //锁定设置

TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable; //空闲模式下输出选择

TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable; //运行模式下按输出选择

  

TIM_CtrlPWMOutputs(TIM1,ENABLE);   //输出使能必须要有

TIM_Cmd(TIM1, ENABLE);  //使能TIM3

}

接下来就是调用硬件驱动接口即可完成对PWM信号的产生与驱动。

如下：

int main(void)

 {

  u16 led0pwmval=0;

u8 dir=1;

delay_init();     //延时函数初始化   

  TIM1_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>300)dir=0;

if(led0pwmval==0)dir=1;  

TIM_SetCompare1(TIM1,led0pwmval);    

}  

 }

l利用keil测试debug。

魔术棒配置软件模拟程序运行

仿真步骤

PB13引脚设置