GD32 输出3路同频不同占空比先后顺序不同的PWM

只看该作者 · 2015-6-29 10:16

方法一：用同一个定时器的3路通道能输出同频不同占空比的pwm;但是他们输出的顺序一定是一样的，因为他们用的是同一个计数器

如果要输出3路不同顺序的PWM必须使用3个定时器

void Tim1_Configuration(void)

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;



GPIO_InitTypeDef GPIO_InitStructure;



/* PA9设置为功能脚(PWM) */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;



GPIO_Init(GPIOA, &GPIO_InitStructure);





RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);





TIM_DeInit(TIM1);



/*TIM1时钟配置*/

TIM_TimeBaseStructure.TIM_Prescaler = 71;         //预分频(时钟分频)72M/72=1000K

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;         //向上计数

TIM_TimeBaseStructure.TIM_Period = 660;       //装载值 1000k/660=1515hz

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;

TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);



/* Channel 2 Configuration in PWM mode */

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //PWM模式2

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效

TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;//反向通道无效

TIM_OCInitStructure.TIM_Pulse = 430;        //占空时间

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性           有效电平

TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //互补端的极性 

TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;

TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;



TIM_OC2Init(TIM1,&TIM_OCInitStructure); //通道1

/* TIM1 counter enable */

//        TIM_Cmd(TIM1,ENABLE);



/* TIM1 Main Output Enable */

//TIM_CtrlPWMOutputs(TIM1,ENABLE);

}



 



PWM占空比高低电平设置：PWM模式1时：CNT（计数器）<TIM_Pulse为有效电平，否则为无效电平;PWM模式2, CNT<TIM_Pulse为无效电平，否则为有效电平