//TIM1 PWM部分初始化
//PWM输出初始化
//arr:自动重装值
//psc:时钟预分频数
void TIM1_PWM_Init(u32 arr,u32 psc)
{
//此部分需手动修改IO口设置
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE); //TIM1时钟使能
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //使能PORTA时钟
//复用不能写成下面,会出问题
//GPIO_PinAFConfig(GPIOA,GPIO_PinSource8|GPIO_PinSource11,GPIO_AF_TIM1); //GPIO复用为定时器1
GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1); //复用GPIOA_Pin8为TIM1_Ch1,
GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_TIM1);//复用GPIOA_Pin11为TIM1_Ch4,注意没有CH4N
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_11; //GPIO
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化P
TIM_TimeBaseStructure.TIM_Prescaler=psc; //定时器分频
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseStructure.TIM_Period=arr; //自动重装载值
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
//TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;//默认就为0
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);//初始化定时器1
//初始化TIM1 PWM模式
//PWM 模式 1–– 在递增计数模式下,只要 TIMx_CNT<TIMx_CCR1,通道 1 便为有效状态,否则为无效状态。在递减计数模式下,
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM1为正常占空比模式,PWM2为反极性模式
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性低,有效电平为低电平
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;//在空闲时输出 低,这里的设置可以改变TIM_OCPolarity 如果没这句,第1通道有问题
TIM_OCInitStructure.TIM_Pulse = 2000; //输入通道1 CCR1(占空比数值)
TIM_OC1Init(TIM1, &TIM_OCInitStructure); //Ch1初始化
TIM_OCInitStructure.TIM_Pulse = 5000;
TIM_OC4Init(TIM1, &TIM_OCInitStructure);//通道4
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能TIM1在CCR1上的预装载寄存器,CCR自动装载默认也是打开的
TIM_ARRPreloadConfig(TIM1,ENABLE);//ARPE使能
TIM_Cmd(TIM1, ENABLE); //使能TIM1
TIM_CtrlPWMOutputs(TIM1, ENABLE);//使能TIM1的PWM输出,TIM1与TIM8有效,如果没有这行会问题
}