如何利用stm32的高級定時器產(chǎn)生PWM

用stm32的高級定時器TIM1和TIM8產(chǎn)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(chǎn)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(fù)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(dāng)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(shè)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(shè)置跳變值，當(dāng)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(dāng)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(shè)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(shè)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(shè)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(chǎn)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(fù)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(dāng)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(shè)置時鐘分頻系數(shù)：不分頻

TIM_TimeBaseStructure.T
來源；21ic