nj_jacky 发表于 2012-8-1 14:11:57

这样的硬件电路有问题吗

https://www.stmcu.org.cn/file:///E:/Work/QQ2011/47538885/Image/P00 
用STM32F103的PA8（PWM，OUT2跟PA8相连）控制输出有问题吗？
使用PA8~PA11做4路PWM控制端，共生产了10片，有6片在使用中发现PA8、PA9、PA10输出为"0"，不知为何？PWM的初始化也看了相关资料应该没有问题。

nj_jacky 发表于 2012-8-1 14:13:02

RE:这样的硬件电路有问题吗

其他4片能够正常控制PWM占空比，频率也是正确的

nj_jacky 发表于 2012-8-1 14:13:30

RE:这样的硬件电路有问题吗

我使用的是STM32F103VCT6

yjwpm 发表于 2012-8-1 14:50:18

RE:这样的硬件电路有问题吗

你的PWM是互补方式输出吗?

安 发表于 2012-8-1 15:40:12

RE:这样的硬件电路有问题吗

看不到你的配置，没法解决。希望把你PWM的配置和IO口的配置发出来，另外，注意外部IO口是不是有被上拉？

么回家 发表于 2012-8-1 16:45:02

RE:这样的硬件电路有问题吗

PWM的配置和IO口的配置发出来
图片看不到

nj_jacky 发表于 2012-8-2 09:33:50

RE:这样的硬件电路有问题吗

//====================================//
void PWM_FROM_TIM1_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_BaseInitStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
//    TIM_BDTRInitTypeDef TIM1_BDTRInitStructure;
//TIM1_OC1:set PWM channel 1 duty
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
    TIM_OCInitStructure.TIM_Pulse = PWM_DUTY_0_PERCENT;
    TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
    TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
//TIM1_OC1:set PWM channel 1 duty
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = PWM_DUTY_0_PERCENT;
    TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
//TIM1_OC2:set PWM channel 2 duty
    TIM_OC2Init(TIM1, &TIM_OCInitStructure);
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = PWM_DUTY_0_PERCENT;
    TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
//TIM1_OC3:set PWM channel 3 duty
    TIM_OC3Init(TIM1, &TIM_OCInitStructure);         
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = PWM_DUTY_0_PERCENT;
    TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);
//TIM1_OC4:set PWM channel 4 duty
    TIM_OC4Init(TIM1, &TIM_OCInitStructure);
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = PWM_DUTY_0_PERCENT;
    TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);
//TIM1 base counter(PWM frequency is 100Hz)
//72MHz/TIM_PRESCALER=1MHz,PWM Frequency = 1MHz / PWM_PERIOD
    TIM_BaseInitStructure.TIM_Prescaler = TIM_PRESCALER-1;
    TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_BaseInitStructure.TIM_Period = PWM_PERIOD-1;
    TIM_BaseInitStructure.TIM_ClockDivision = 0;
    TIM_BaseInitStructure.TIM_RepetitionCounter = 0;
    TIM_TimeBaseInit(TIM1, &TIM_BaseInitStructure);
    TIM_ARRPreloadConfig(TIM1, ENABLE);
    TIM_ClearITPendingBit(TIM1, TIM_IT_Update | TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4);
//open TIM1
    TIM_Cmd(TIM1, ENABLE);
//enable TIM1_CO to enable PWM channel x(must be added)
    TIM_CtrlPWMOutputs(TIM1, ENABLE);
}

nj_jacky 发表于 2012-8-2 09:35:11

RE:这样的硬件电路有问题吗

GPIO_InitStructure.GPIO_Pin =GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

nj_jacky 发表于 2012-8-7 08:37:09

RE:这样的硬件电路有问题吗

期待高手指点，谢谢！
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