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用32單片機(jī)的TIM3的全映射的通道三（PC8）和通道四(PC9)輸出兩路PWM波，程序如下，為什么用keil中的模擬只有PC8有PWM波形，PC9無呢，這是為什么？ time.C
- void TIM3_CH3_PWM_Init(u16 arr,u16 psc) //通道3的初始化
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
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- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定時器3時鐘
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外設(shè)和AFIO復(fù)用功能模塊時鐘
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- GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH2->PB5
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- //設(shè)置該引腳為復(fù)用輸出功能,輸出TIM3 CH2的PWM脈沖波形 GPIOC.8
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH3
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化GPIO
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- //初始化TIM3
- TIM_TimeBaseStructure.TIM_Period = arr; //設(shè)置在下一個更新事件裝入活動的自動重裝載寄存器周期的值
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //設(shè)置用來作為TIMx時鐘頻率除數(shù)的預(yù)分頻值
- TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設(shè)置時鐘分割:TDTS = Tck_tim
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數(shù)模式
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時間基數(shù)單位
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- //初始化TIM3 Channel2 PWM模式
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時器模式:TIM脈沖寬度調(diào)制模式2
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //輸出極性:TIM輸出比較極性高
- TIM_OC3Init(TIM3, &TIM_OCInitStructure); //根據(jù)T指定的參數(shù)初始化外設(shè)TIM3 OC3
- TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable); //使能TIM3在CCR2上的預(yù)裝載寄存器
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- TIM_CtrlPWMOutputs(TIM3,ENABLE);
- TIM_ARRPreloadConfig(TIM3, ENABLE);
- TIM_Cmd(TIM3, ENABLE); //使能TIM3
-
- }
- void TIM3_CH4_PWM_Init(u16 arr,u16 psc) //通道4的初始化
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
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- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定時器3時鐘
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外設(shè)和AFIO復(fù)用功能模塊時鐘
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- GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH2->PB5
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- // GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE);
- //設(shè)置該引腳為復(fù)用輸出功能,輸出TIM3 CH3的PWM脈沖波形 GPIOC.9
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //TIM_CH4
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化GPIO
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- //初始化TIM3
- TIM_TimeBaseStructure.TIM_Period = arr; //設(shè)置在下一個更新事件裝入活動的自動重裝載寄存器周期的值
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //設(shè)置用來作為TIMx時鐘頻率除數(shù)的預(yù)分頻值
- TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設(shè)置時鐘分割:TDTS = Tck_tim
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數(shù)模式
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時間基數(shù)單位
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- //初始化TIM3 Channel2 PWM模式
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時器模式:TIM脈沖寬度調(diào)制模式2
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //輸出極性:TIM輸出比較極性高
- TIM_OC4Init(TIM3, &TIM_OCInitStructure); //根據(jù)T指定的參數(shù)初始化外設(shè)TIM3 OC4
- TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
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- TIM_CtrlPWMOutputs(TIM3,ENABLE);
- TIM_ARRPreloadConfig(TIM3, ENABLE);
- TIM_Cmd(TIM3, ENABLE); //使能TIM3
- }
- int main(void)
- {
- u8 m1,m2;
- u8 sumHD;
- delay_init(); //延時函數(shù)初始化
- LED_Init(); //初始化與LED連接的硬件接口
- H_D_Init();
- TIM3_CH3_PWM_Init(899,71);
- TIM3_CH4_PWM_Init(899,71);
- while(1)
- {
- }
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