为何下载程序后只能执行一次，复位后lcd就白屏了，必须重新下载一次，才能正常显示。但再次复位后，问题依旧。。

珑g

是不是加入中断后的缘故？

正点原子

直接下载我们的例程试试

freewayflyer

LCD不显示是否说明程序没运行？复位都不行的话用示波器测下晶振是否起振 ，怀疑晶振没起振

珑g

回复【2楼】正点原子:
---------------------------------
直接下载我们的例程还是好的

珑g

回复【3楼】freewayflyer:
---------------------------------
应该是程序问题

珑g

[mw_shl_code=c,true]#include "stm32f10x.h" #include "sys.h" #include "delay.h" #include "usart.h" #include "lcd.h" #include "led.h" #include "exti.h" #include "timer.h" int main(void) { u8 lcd_id[12]; //??·?LCD ID×?·??® delay_init(); //???±?????????? NVIC_Configuration(); //?è??NVIC????·?×é2:2??????????????2???ì???????? LED_Init(); //????????LED?????????????? LCD_Init(); delay_ms(50); TIM2_Init(4999,14399); //10Khz??????????????????5000??500ms sprintf((char*)lcd_id,"LCD ID:%04X",lcddev.id); //??LCD ID?ò????lcd_id??×é?? POINT_COLOR=DARKBLUE; //??±????? LCD_ShowString(20,40,220,24,24,"^_^ Mini STM32 ^_^"); //x,y,width,height,size,*p LCD_ShowString(70,70,200,16,16,"TIMER-LCD TEST"); LCD_ShowString(70,90,200,16,16,"ATOM@ALIENTEK"); LCD_ShowString(70,110,200,16,16,lcd_id); //????LCD ID POINT_COLOR=GREEN; LCD_ShowString(70,130,200,16,16,"WEATHER: SUNNY"); POINT_COLOR=DARKBLUE; LCD_ShowString(140,150,200,12,12,"2014/7/31"); while(1) { LCD_ShowChar(70,170,':',24,1); LCD_ShowChar(120,170,':',24,1); } } #include "timer.h" #include "led.h" #include "lcd.h" void TIM2_Init(u16 arr,u16 psc) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE); //?????¨?±?÷?±?? TIM_DeInit(TIM2); //??TIM2?è?????±???? TIM_InternalClockConfig(TIM2); //?????????±???? TIM_TimeBaseStructure.TIM_Period = arr; //×?????×°???? TIM_TimeBaseStructure.TIM_Prescaler = psc; //?è???¤·????????±?¤·???????psc?±???ò?±??·?????psc+1 TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //?è???±??·??? TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //?è?????ò?????? TIM_TimeBaseInit(TIM2, & TIM_TimeBaseStructure); TIM_PrescalerConfig(TIM2, psc,TIM_PSCReloadMode_Immediate); //?????????¨?±?÷?¤·????? TIM_ClearFlag(TIM2, TIM_FLAG_Update); //????????±ê?? TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE ); //?????¨?±?÷???? NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM2???? NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //??????????0?? NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //????????0?? NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?¨??±????? NVIC_Init(&NVIC_InitStructure); //?ù??NVIC_InitStruct?????¨???????????????èNVIC?????÷ TIM_Cmd(TIM2, ENABLE); //????TIM2 } void TIM2_IRQHandler(void) { if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) //?ì?é???¨??TIM????·??ú??·?:TIM ?????? { static u16 sec,min,hour; LED0 = !LED0; LCD_ShowNum(150,170,sec,2,24); sec ++; if(sec==60) { sec=00; min++; } LCD_ShowNum(100,170,min,2,24); if(min==60) { min=00; hour++; } LCD_ShowNum(50,170,hour,2,24); if(hour==24) hour=00; } TIM_ClearITPendingBit(TIM2, TIM_IT_Update); //????TIMx???????????í??:TIM ?????? }[/mw_shl_code]

珑g

回复【6楼】珑g:
---------------------------------
注释都乱码了

Admin

那复位后程序是否正常执行？
如果您没有办法在线调试。就弄个LED指示程序运行。。看看程序是否运行了
如果没有。查看你的B0 B1.。。