int main(void)
{ 
u8 key;
u8 t;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//?è????????????????·?×é2
delay_init(168);  //?????????±????
uart_init(115200); //???????®???¨??????115200
usart2_init(42,115200); //???????®??2?¨??????115200
LED_Init(); //??????LED 
  LCD_Init(); //LCD??????  
  KEY_Init(); //°??ü?????? 
TIM3_Int_Init(10000-1,8400-1);//10Khz????,1????????????

  usmart_dev.init(84); //??????USMART
  POINT_COLOR=RED;//?è??×??????ì?? 
LCD_ShowString(30,50,200,16,16,"Explorer STM32F4");
LCD_ShowString(30,70,200,16,16,"OV2640 TEST");
LCD_ShowString(30,90,200,16,16,"ATOM@ALIENTEK");
LCD_ShowString(30,110,200,16,16,"2014/5/14");    
while(OV2640_Init())//??????OV2640
{
LCD_ShowString(30,130,240,16,16,"OV2640 ERR");
delay_ms(200);
   LCD_Fill(30,130,239,170,WHITE);
delay_ms(200);
}
LCD_ShowString(30,130,200,16,16,"OV2640 OK");    
  while(1)
{
key=KEY_Scan(0);
if(key==KEY0_PRES) //RGB565????
{
ov2640_mode=0;   
break;
}else if(key==KEY1_PRES) //JPEG????
{
ov2640_mode=1;
break;
}
t++;  
if(t==100)LCD_ShowString(30,150,230,16,16,"KEY0:RGB565  KEY1:JPEG"); //?????????á??????
  if(t==200)
{
LCD_Fill(30,150,210,150+16,WHITE);
t=0; 
}
delay_ms(5);  
}
if(ov2640_mode)jpeg_test();
else rgb565_test(); 
}