void PWM_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE);//使能GPIO时钟
//正极性输出引脚PA.8-->TIM1_CH1,PA.9-->TIM1_CH2,PA.10-->TIM1_CH2
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10; //PA8 PA11
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); //使能GPIOA
//反极性输出引脚PB.13-->TIM1_CH1N,PB.14-->TIM1_CH2N,PB.15-->TIM1_CH3N
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15; //PA8 PA11
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); //使能GPIOB
}
/***************************************************************
* Function : TIMx_PWM_Init
* Description : PWM初始化
* Input : None
* Output : None
* Return : None
* Declaration : 定时器的初始化
****************************************************************/
void PWM_TIMx_Init(uint16_t arr,uint16_t psc)
{
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
TIM_DeInit(TIM1); //定时器1复位
/*定时器1初始化*/
TIM_TimeBaseStructure.TIM_Period=arr; //自动重装载值
TIM_TimeBaseStructure.TIM_Prescaler=psc; //预分频系数
TIM_TimeBaseStructure.TIM_ClockDivision=0X00; //设置时钟分割TDTS==tck_Tim
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_ARRPreloadConfig(TIM1,DISABLE); //禁止ARR预装缓冲器
/*双路互补PWM初始化*/
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1; //TIM_OCMode_PWM1
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable; //正极性输出使能
TIM_OCInitStructure.TIM_OutputNState=TIM_OutputNState_Enable; //互补极性输出使能
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High; //PWM输出极性
TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCPolarity_High; //PWM互补极性
TIM_OCInitStructure.TIM_Pulse=450; //占空比
TIM_OCInitStructure.TIM_OCIdleState=TIM_OCIdleState_Set; //死区后输出状态
TIM_OCInitStructure.TIM_OCNIdleState=TIM_OCIdleState_Reset; //死区后互补极性输出状态
//初始化3路正极性PWM:PA.8,PA.9,PA.10
TIM_OC1Init(TIM1,&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse=350;
TIM_OC2Init(TIM1,&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_Pulse=250;
TIM_OC3Init(TIM1,&TIM_OCInitStructure);
//配置3路正极性PWM
//TIM_OC1PolarityConfig(TIM1,TIM_OCPreload_Enable);//PWM通道1预装载使能
//TIM_OC2PolarityConfig(TIM1,TIM_OCPreload_Enable);//PWM通道2预装载使能
//TIM_OC3PolarityConfig(TIM1,TIM_OCPreload_Enable);//PWM通道3预装载使能
//死区和刹车配置功能仅仅对TIM1和TIM8高级定时器有效
TIM_BDTRInitStructure.TIM_OSSIState=TIM_OSSIState_Enable; //空闲模式下的输出使能
TIM_BDTRInitStructure.TIM_OSSRState=TIM_OSSRState_Enable; //运行模式下的输出使能
TIM_BDTRInitStructure.TIM_LOCKLevel=TIM_LOCKLevel_OFF; //锁定设置
TIM_BDTRInitStructure.TIM_DeadTime=0X00; //设置死区时间2us
TIM_BDTRInitStructure.TIM_Break=TIM_Break_Disable; //刹车功能关闭
TIM_BDTRInitStructure.TIM_BreakPolarity=TIM_BreakPolarity_Low; //刹车输入极性
TIM_BDTRInitStructure.TIM_AutomaticOutput=TIM_AutomaticOutput_Disable;//关闭自动输出使能
TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);
//高级定时器的输出控制使能刹车MOE主输出使能
TIM_CtrlPWMOutputs(TIM1,ENABLE);
TIM_ARRPreloadConfig(TIM1,ENABLE);
//定时器使能
TIM_Cmd(TIM1,ENABLE);
}
STM32F103C8T6 IO口PA.8 PA.9 PA.10 PB.13 PB.14 PB.15 注释这三句后:波形 //TIM_OC1PolarityConfig(TIM1,TIM_OCPreload_Enable);//PWM通道1预装载使能 //TIM_OC2PolarityConfig(TIM1,TIM_OCPreload_Enable);//PWM通道2预装载使能 //TIM_OC3PolarityConfig(TIM1,TIM_OCPreload_Enable);//PWM通道3预装载使能 未注释的波形: TIM_OC1PolarityConfig(TIM1,TIM_OCPreload_Enable);//PWM通道1预装载使能 TIM_OC2PolarityConfig(TIM1,TIM_OCPreload_Enable);//PWM通道2预装载使能 TIM_OC3PolarityConfig(TIM1,TIM_OCPreload_Enable);//PWM通道3预装载使能
未注释的仿真波形
注释后仿真波形
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