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最后登录1970-1-1
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注册时间2014-1-7
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我使用TIM3产生PWM,使用完全重映像和没有映像是,都可以输出四路PWM,但使用部分重映像,只能输出三路PWM,PB4一直都是高电平,求解原因?
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3 , ENABLE); //
//
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_4|GPIO_Pin_5; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//
//
TIM_TimeBaseStructure.TIM_Period = arr; //μ
TIM_TimeBaseStructure.TIM_Prescaler =psc; //
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //¸
//
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //
TIM_OC1Init(TIM3, &TIM_OCInitStructure); //¸ù¾YTÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèTIM3 OC2
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //¸ù¾YTÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèTIM3 OC2
TIM_OC3Init(TIM3, &TIM_OCInitStructure); //¸ù¾YTÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèTIM3 OC2
TIM_OC4Init(TIM3, &TIM_OCInitStructure); //¸ù¾YTÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèTIM3 OC2
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); //ê1ÄüTIM3ÔúCCR2éÏμÄԤװÔؼÄ′æÆ÷
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //ê1ÄüTIM3ÔúCCR2éÏμÄԤװÔؼÄ′æÆ÷
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable); //ê1ÄüTIM3ÔúCCR2éÏμÄԤװÔؼÄ′æÆ÷
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable); //ê1ÄüTIM3ÔúCCR2éÏμÄԤװÔؼÄ′æÆ÷
//TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); //ê1ÄüTIM3ÔúCCR2éÏμÄԤװÔؼÄ′æÆ÷
TIM_Cmd(TIM3, ENABLE); //ê1ÄüTIM3
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