stm32 高级定时器产生PWM
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用stm32的高级定时器TIM1和TIM8产生PWM，需要注意：
1.都有TIM1，但只有flash容量大于256K的大容量单片机才有TIM8
2.高级定时器相对于通用定时器，多了TIM_CtrlPWMOutputs(TIM8, ENABLE);
TIM1产生四路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;//复用推挽输出
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;//当定时器从0计数到999，即为1000次，为一个定时周期
TIM_TimeBaseStructure.TIM_Prescaler=71;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;//设置时钟分频系数：不分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;//向上计数模式
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;//配置为PWM模式1
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
//TIM_OCInitStructure.TIM_OutputNState=TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse=CCR1_Val;//设置跳变值，当计数器计数到这个值时，电平发生跳变
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;//当定时器计数值小于CCR1_Val时为高电平
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;//设置通道2的电平跳变值，输出另外一个占空比的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;//设置通道3的电平跳变值，输出另外一个占空比的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;//设置通道4的电平跳变值，输出另外一个占空比的PWM
TIM_OC4Init(TIM1,&TIM_OCInitStructure);//使能通道4
TIM_OC4PreloadConfig(TIM1,TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM1,ENABLE);//使能TIM1重载寄存器ARR
TIM_CtrlPWMOutputs(TIM1,ENABLE);
TIM_Cmd(TIM1,ENABLE);
}
voidTIM1_PWM_Init(void)
{
TIM1_GPIO_Config();
TIM1_Mode_Config();
}
TIM8产生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;//复用推挽输出
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;//当定时器从0计数到999，即为1000次，为一个定时周期
TIM_TimeBaseStructure.TIM_Prescaler=71;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;//设置时钟分频系数：不分频
TIM_TimeBaseStructure.T
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