用32单片机的TIM3的全映射的通道三（PC8）和通道四(PC9)输出两路PWM波，程序如下，为什么用keil中的模拟只有PC8有PWM波形，PC9无呢，这是为什么？ 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;
-
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定时器3时钟
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟
-
- GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH2->PB5
-
- //设置该引脚为复用输出功能,输出TIM3 CH2的PWM脉冲波形 GPIOC.8
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH3
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化GPIO
-
-
- //初始化TIM3
- TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
- TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
-
- //初始化TIM3 Channel2 PWM模式
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
- TIM_OC3Init(TIM3, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM3 OC3
- TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable); //使能TIM3在CCR2上的预装载寄存器
-
- 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;
-
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定时器3时钟
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟
-
- GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH2->PB5
-
- // GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE);
- //设置该引脚为复用输出功能,输出TIM3 CH3的PWM脉冲波形 GPIOC.9
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //TIM_CH4
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化GPIO
-
- //初始化TIM3
- TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
- TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
-
-
- //初始化TIM3 Channel2 PWM模式
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
- TIM_OC4Init(TIM3, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM3 OC4
- TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
-
-
- 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(); //延时函数初始化
- LED_Init(); //初始化与LED连接的硬件接口
- H_D_Init();
- TIM3_CH3_PWM_Init(899,71);
- TIM3_CH4_PWM_Init(899,71);
- while(1)
- {
- }
|
