STM32 TIM1 PWM 输出

GPIO_InitTypeDef GPIO_InitStructure2;

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;

TIM_BDTRInitTypeDef TIM_BDTRInitStructure;

//第一步：配置时钟

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_TIM1,ENABLE);

//第二步，配置goio口

GPIO_InitStructure2.GPIO_Pin=GPIO_Pin_8;

GPIO_InitStructure2.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_InitStructure2.GPIO_Mode=GPIO_Mode_AF_PP; //设置为复用浮空输出

GPIO_Init(GPIOA,&GPIO_InitStructure2);

GPIO_InitStructure2.GPIO_Pin=GPIO_Pin_13;

GPIO_InitStructure2.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_InitStructure2.GPIO_Mode=GPIO_Mode_AF_PP; //设置为复用浮空输出

GPIO_Init(GPIOB,&GPIO_InitStructure2);

//第三步，定时器基本配置

TIM_TimeBaseStructure.TIM_Period=1000-1; // 自动重装载寄存器的值

TIM_TimeBaseStructure.TIM_Prescaler=72-1; // 时钟预分频数

TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; // 采样分频

TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数

TIM_TimeBaseStructure.TIM_RepetitionCounter=0; //重复寄存器，用于自动更新pwm占空比

TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

//第四步pwm输出配置

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2; //设置为pwm1输出模式

TIM_OCInitStructure.TIM_Pulse=500; //设置占空比时间

TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_Low; //设置输出极性

TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable; //使能该通道输出

//下面几个参数是高级定时器才会用到，通用定时器不用配置

TIM_OCInitStructure.TIM_OCNPolarity=TIM_OCNPolarity_High; //设置互补端输出极性

TIM_OCInitStructure.TIM_OutputNState=TIM_OutputNState_Enable;//使能互补端输出

TIM_OCInitStructure.TIM_OCIdleState=TIM_OCIdleState_Reset; //死区后输出状态

TIM_OCInitStructure.TIM_OCNIdleState=TIM_OCNIdleState_Reset;//死区后互补端输出状态

TIM_OC1Init(TIM1,&TIM_OCInitStructure); //按照指定参数初始化

//第五步，死区和刹车功能配置，高级定时器才有的，通用定时器不用配置

TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Disable;//运行模式下输出

TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Disable;//空闲模式下输出选择

TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF; //锁定设置

TIM_BDTRInitStructure.TIM_DeadTime = 0x90; //死区时间设置

TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable; //刹车功能使能

TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;//刹车输入极性

TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;//自动输出使能

TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);

//第六步，使能端的打开

TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能TIMx在CCR1上的预装载寄存器

TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器

TIM_Cmd(TIM1,ENABLE); //打开TIM2

//下面这句是高级定时器才有的，输出pwm必须打开

TIM_CtrlPWMOutputs(TIM1, ENABLE); //pwm输出使能，一定要记得打开

// 在运行当中想要改变pwm的频率和占空比调用：

TIM_SetAutoreload(TIM1,1000);

TIM_SetCompare1(TIM1,500);