原子大哥！请教个TIM 输出PWM互补问题！

alanluhuan · 发表于 2012-8-2 15:52:45

为什么我用TIM1 ch1 ch1n和ch2 ch2n输出PWM不行, 把其中的一个通道屏蔽掉就能出PWM，而且这两个通道分别和CH3 CH3N都能出PWM！

正点原子 · 发表于 2012-8-2 15:53:52

回复【楼主位】alanluhuan:
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应该不至于,你设置的问题吧.

alanluhuan · 发表于 2012-8-2 15:56:05

查了半天，也没查出哪里设置问题！而且3个通道同时使用, CH1 CH1N老是一个高，一个低，其他两个都能出PWM

alanluhuan · 发表于 2012-8-2 15:57:02

void BLDC_GPIOSetup(void)
{
//  BLDC 驱动管脚IO配置
/*GPIO做相应设置，为AF输出//PA.8/9/10口设置为TIM1的OC1输出口*/
    GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /*PB.13/14/15口设置为TIM1_CH1N,TIM1_CH2N和TIM1_CH3N输出口*/
    GPIO_InitStructure.GPIO_Pin=GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
}

void

WM_Configuration(void)
{
TIM_TimeBaseStructure.TIM_Prescaler = 0;     //时钟预分值
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseStructure.TIM_Period = 4000;     //寄存器周期值
TIM_TimeBaseStructure.TIM_ClockDivision = 0;    //时钟分割
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = new_ccr_val;

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set;

TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OC3Init(TIM1, &TIM_OCInitStructure);

TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能捕获比较寄存器预装载（通道1）
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能捕获比较寄存器预装载（通道2）
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能捕获比较寄存器预装载（通道3）

TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;

TIM_BDTRInitStructure.TIM_DeadTime = 7;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);

// preload ARR register
TIM_CCPreloadControl(TIM1, ENABLE);
TIM_SelectCOM(TIM1,ENABLE);

TIM_SelectInputTrigger(TIM1, TIM_TS_ITR2);

TIM_ITConfig(TIM1, TIM_IT_COM, ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
TIM_Cmd(TIM1,ENABLE);
}