用stm32的高級定時器TIM1和TIM8產生PWM，需要注意：

1.都有TIM1，但只有flash容量大于256K的大容量單片機才有TIM8

2.高級定時器相對于通用定時器，多了TIM_CtrlPWMOutputs(TIM8, ENABLE);

TIM1產生四路PWM程序：

staticvoidTIM1_GPIO_Config(void)

{

GPIO_InitTypeDefGPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;//復用推挽輸出

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_Init(GPIOA,&GPIO_InitStructure);

}

staticvoidTIM1_Mode_Config(void)

{

TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure;

TIM_OCInitTypeDefTIM_OCInitStructure;

u16CCR1_Val=500;

u16CCR2_Val=500;

u16CCR3_Val=500;

u16CCR4_Val=500;

TIM_TimeBaseStructure.TIM_Period=999;//當定時器從0計數(shù)到999，即為1000次，為一個定時周期

TIM_TimeBaseStructure.TIM_Prescaler=71;

TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;//設置時鐘分頻系數(shù)：不分頻

TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//向上計數(shù)模式

TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;//配置為PWM模式1

TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;

//TIM_OCInitStructure.TIM_OutputNState=TIM_OutputNState_Enable;

TIM_OCInitStructure.TIM_Pulse=CCR1_Val;//設置跳變值，當計數(shù)器計數(shù)到這個值時，電平發(fā)生跳變

TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//當定時器計數(shù)值小于CCR1_Val時為高電平

TIM_OC1Init(TIM1,&TIM_OCInitStructure);//使能通道1

TIM_OC1PreloadConfig(TIM1,TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse=CCR2_Val;//設置通道2的電平跳變值，輸出另外一個占空比的PWM

TIM_OC2Init(TIM1,&TIM_OCInitStructure);//使能通道2

TIM_OC2PreloadConfig(TIM1,TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse=CCR3_Val;//設置通道3的電平跳變值，輸出另外一個占空比的PWM

TIM_OC3Init(TIM1,&TIM_OCInitStructure);//使能通道3

TIM_OC3PreloadConfig(TIM1,TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse=CCR4_Val;//設置通道4的電平跳變值，輸出另外一個占空比的PWM

TIM_OC4Init(TIM1,&TIM_OCInitStructure);//使能通道4

TIM_OC4PreloadConfig(TIM1,TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM1,ENABLE);//使能TIM1重載寄存器ARR

TIM_CtrlPWMOutputs(TIM1,ENABLE);

TIM_Cmd(TIM1,ENABLE);

}

voidTIM1_PWM_Init(void)

{

TIM1_GPIO_Config();

TIM1_Mode_Config();

}

TIM8產生2路PWM程序：

staticvoidTIM8_GPIO_Config(void)

{

GPIO_InitTypeDefGPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7|GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;//復用推挽輸出

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_Init(GPIOC,&GPIO_InitStructure);

}

staticvoidTIM8_Mode_Config(void)

{

TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure;

TIM_OCInitTypeDefTIM_OCInitStructure;

u16CCR1_Val=500;

u16CCR2_Val=500;

u16CCR3_Val=500;

u16CCR4_Val=500;

TIM_TimeBaseStructure.TIM_Period=999;//當定時器從0計數(shù)到999，即為1000次，為一個定時周期

TIM_TimeBaseStructure.TIM_Prescaler=71;

TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;//設置時鐘分頻系數(shù)：不分頻

TIM_TimeBaseStructure.T