1、项目中需要产生PWM信号，原子的例程中是通过TIM14产生PWM信号，然后我以为在初始化函数中只是简单的将TIM14替换为TIM1，程序就可以运行，忽略了TIM1是高级定时器，TIM14为通用定时器。部分功能TIM14中没有，初始化中也没有初始化TIM1中的部分功能，所以在修改TIM14的初始化程序中要添加TIM1中的寄存器，一定要把定时器中必要的所有寄存器全部进行初始化。代码如下。
void TIM1_PWM_Init(u32 arr,u32 psc) { // TIM1_PWM_Init(500-1,84-1); //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 GPIO_PinAFConfig(GPIOA,GPIO_PinSource8,GPIO_AF_TIM1); //GPIOA8复用为定时器1 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //GPIOA8 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_NOPULL; //上拉 GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA8 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=0; //20201020 TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);//初始化定时器1 //初始化TIM1 Channel1 PWM模式 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputState_Disable;//20201020 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式1 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性低 TIM_OCInitStructure.TIM_OCNPolarity= TIM_OCPolarity_High;//20201020 TIM_OCInitStructure.TIM_OCIdleState= 0x00000000U ;//20201020 TIM_OCInitStructure.TIM_OCNIdleState=0x00000000U;//20201020 TIM_OCInitStructure.TIM_Pulse=300; // TIM_SetCompare1(TIM1,CCR1_Val);// channel 1 20201020 TIM_OC1Init(TIM1, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM1 4OC1 TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能TIM1在CCR1上的预装载寄存器 TIM_ARRPreloadConfig(TIM1,ENABLE);//ARPE使能 TIM_Cmd(TIM1, ENABLE); //使能TIM1 TIM_CtrlPWMOutputs(TIM1, ENABLE); //20201020 }
