程序TIM1的PWM下载到芯片正常输出，重新上电输出不正常

只看该作者 · 2013-8-30 17:00

使用32TIM1输出PWM调制信号，将程序下载到芯片上时，能正常工作，输出目标PWM，但断电后再重新上电PWM输出就不正常；论坛香主说的外设还没有准备就绪，或者程序配置顺序有问题，我有些不懂，请教一下一下配置程序：
请问有什么问题么？怎么一掉电就不行了？？？怎样等待让外设上完电？？？？
void InitSpwmTime1(void)
{
#if  (SpwmMode==__STM32__)
TIM_TimeBaseInitTypeDef TIM1_BaseInitStruct;  //Tim1基本配置
TIM_OCInitTypeDef TIM1_OCInitStruct; //配置互补推挽设置
TIM_BDTRInitTypeDef TIM1_BDTRInitStruct; //死区时间配置
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);//使能定时器1时钟
TIM_DeInit(TIM1);       //复位寄存器
delay(1000);          //等待外设上电稳定
/*=================配置定时器=========================*/
TIM1_BaseInitStruct.TIM_Period =SPWM.Time; //中断周期
TIM1_BaseInitStruct.TIM_Prescaler=SpwmTimePrescaler;//不分频，时钟为72M
//配置定时器为中央对齐模式2技术模式
TIM1_BaseInitStruct.TIM_CounterMode=TIM_CounterMode_CenterAligned2;
TIM_TimeBaseInit(TIM1,&TIM1_BaseInitStruct);  //初始化
TIM_ClearFlag(TIM1, TIM_FLAG_Update); //清除中断标志
TIM1_OCInitStruct.TIM_OCMode=TIM_OCMode_PWM1;  //配置为PWM模式
//使能输出比较
TIM1_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable;
//使能互补输出
TIM1_OCInitStruct.TIM_OutputNState=TIM_OutputNState_Enable;
//输出比较极性为高
TIM1_OCInitStruct.TIM_Pulse =SPWM.Data[0]; //提取第一个数据
TIM1_OCInitStruct.TIM_OCPolarity  =TIM_OCPolarity_High;
TIM1_OCInitStruct.TIM_OCNPolarity =TIM_OCNPolarity_High;
//
TIM1_OCInitStruct.TIM_OCIdleState =TIM_OCIdleState_Reset;
TIM1_OCInitStruct.TIM_OCNIdleState=TIM_OCNIdleState_Reset;//TIM_OCNIdleState_Set;
TIM_OC1Init(TIM1,&TIM1_OCInitStruct);    //配置通道1
TIM_OC2Init(TIM1,&TIM1_OCInitStruct);    //配置通道2
TIM_OC3Init(TIM1,&TIM1_OCInitStruct);    //
/*===================死区时间处理======================*/
TIM1_BDTRInitStruct.TIM_OSSRState =TIM_OSSRState_Enable;
TIM1_BDTRInitStruct.TIM_OSSIState =TIM_OSSIState_Enable;
TIM1_BDTRInitStruct.TIM_DeadTime  =(u8)((float)SpwmDeadTime*MasterTimeFreq); //先配置死区时间，在上锁
TIM1_BDTRInitStruct.TIM_LOCKLevel =TIM_LOCKLevel_1;//上锁
//使能自动输出
TIM1_BDTRInitStruct.TIM_AutomaticOutput=TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1,&TIM1_BDTRInitStruct); //
TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE); //定时器更新中断
TIM_CtrlPWMOutputs(TIM1,ENABLE);
TIM_Cmd(TIM1,ENABLE);       //使能定时器
SPWM.ContA=1;          //
#elif (SpwmMode==__STM8__)

#endif
}

是要主程序当中等待么
void main()
{
delay(100);
然后使能外设时钟？？
}