回复【23楼】正点原子:
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     原子哥我只是想单纯的想把USB读卡器实验移植到照相机实验上去，就像把手机插在电脑上，电脑可以识别手机中SD的内容，这时手机拍下照片，电脑刷新一下就会看见拍下的照片已经在SD的目录里了，我认为理论上是可行的，结果出现好多问题，至今还未解决....
     我的TFT屏上显示的内容是 战舰 STM32开发板
                                             照相机实验
                                             WK_UP:拍照
                                             正点原子@ALIENTEK
                                             2012年9月19日
                                             SD卡正常！
                                             USB Connecting
                                             OV7670 正常
然而OV7670并不工作，让我纠结。屏幕一直是显示这些内容，没有显示摄像头拍到的内容，照相机功能也没有，USB也无法读出SD卡，实在是想不出是什么原因。
请原子哥给指条明路，我这两个实验结合是理论上就无法实现还是我的程序改的不对，应该怎么改呢。
main函数如下：
extern u8 ov_sta;
extern u8 ov_frame;    
void camera_refresh(void)
{
u32 j;
  u16 color;  
if(ov_sta==2)
{
LCD_Scan_Dir(U2D_L2R);
LCD_SetCursor(0x00,0x0000);
LCD_WriteRAM_Prepare();     
OV7670_RRST=0;  
OV7670_RCK=0;
OV7670_RCK=1;
OV7670_RCK=0;
OV7670_RRST=1;
OV7670_RCK=1;  
for(j=0;j<76800;j++)
{
OV7670_RCK=0;
color=GPIOC->IDR&0XFF;
OV7670_RCK=1; 
color<<=8;  
OV7670_RCK=0;
color|=GPIOC->IDR&0XFF;
OV7670_RCK=1; 
LCD->LCD_RAM=color;    
}     
EXTI_ClearITPendingBit(EXTI_Line8);  
ov_sta=0;
  ov_frame++; 
LCD_Scan_Dir(DFT_SCAN_DIR);  
} 
}
void usb_port_set(u8 enable)//把这句定义USB电源供电的语句放在这应该没问题吧?
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);         
if(enable)_SetCNTR(_GetCNTR()&(~(1<<1)));
else
{   
_SetCNTR(_GetCNTR()|(1<<1));  
GPIOA->CRH&=0XFFF00FFF;
GPIOA->CRH|=0X00033000;
PAout(12)=0;        
}
}  
void camera_new_pathname(u8 *pname)
{  
u8 res;  
u16 index=0;
while(index<0XFFFF)
{
sprintf((char*)pname,"0HOTO/PIC%05d.bmp",index);
res=f_open(ftemp,(const TCHAR*)pname,FA_READ);
if(res==FR_NO_FILE)break;
index++;
}
}  

 
 int main(void)
 {  
u8 res;  
u8 *pname;    
u8 i;  
u8 sd_ok=1;
  u8 key;
u8 offline_cnt=0;//USB要用到的四个变量
u8 tct=0;
u8 USB_STA;
u8 Divece_STA; 
 
delay_init();          
NVIC_Configuration(); 
uart_init(9600);  
  LED_Init();      
LCD_Init();
BEEP_Init();        
KEY_Init();  
  mem_init(SRAMIN);
usmart_dev.init(72);
  exfuns_init();  
   f_mount(0,fs[0]);   
  f_mount(1,fs[1]); 
piclib_init();
POINT_COLOR=RED;    
  SPI_Flash_Init();
if(SD_Initialize())LCD_ShowString(60,190,200,16,16,"SD Card Error!");
else 
{      
LCD_ShowString(60,190,200,16,16,"SD Card Size:     MB");
      Mass_Memory_Size[0]=(long long)SD_GetSectorCount()*512;
    Mass_Block_Size[0] =512;
    Mass_Block_Count[0]=Mass_Memory_Size[0]/Mass_Block_Size[0];
  LCD_ShowNum(164,130,Mass_Memory_Size[0]>>20,5,16);
  }
if(SPI_FLASH_TYPE!=W25Q64)LCD_ShowString(60,190,200,16,16,"W25Q64 Error!");
else //SPI FLASH ????
{      
      Mass_Memory_Size[1]=1024*1024*6;
    Mass_Block_Size[1] =512;
    Mass_Block_Count[1]=Mass_Memory_Size[1]/Mass_Block_Size[1];
LCD_ShowString(60,210,200,16,16,"SPI FLASH Size:6144KB");  
}
  while(font_init()) 
{     
LCD_ShowString(60,50,200,16,16,"Font Error!");
delay_ms(200);   
LCD_Fill(60,50,240,66,WHITE);      
}    
  Show_Str(60,50,200,16,"战舰STM32开发板",16,0);       
Show_Str(60,70,200,16,"照相机实验",16,0);       
Show_Str(60,90,200,16,"WK_UP:拍照",16,0);       
Show_Str(60,110,200,16,"正点原子@ALIENTEK",16,0);       
Show_Str(60,130,200,16,"2012年9月19日",16,0);
res=f_mkdir("0:/PHOTO");
if(res!=FR_EXIST&&res!=FR_OK) 
{     
Show_Str(60,150,240,16,"SD?¨?í?ó!",16,0);
delay_ms(200);   
Show_Str(60,170,240,16,"????????????????!",16,0);
sd_ok=0;  
}else
{
Show_Str(60,150,240,16,"SD?¨????!",16,0);
delay_ms(200);   
Show_Str(60,170,240,16,"KEY_UP:????",16,0);
sd_ok=1;     
}         
  pname=mymalloc(SRAMIN,30);     
  while(pname==NULL)
  {     
Show_Str(60,190,240,16,"????·????§°?!",16,0);
delay_ms(200);   
LCD_Fill(60,190,240,146,WHITE);     
delay_ms(200);   
}      
while(OV7670_Init())//按说有这句初始化ov7670的话，屏幕显示ov7670正常以后，LCD就会有图像的，然而.......
{
Show_Str(60,190,240,16,"OV7670 ?í?ó!",16,0);
delay_ms(200);
  LCD_Fill(60,190,239,186,WHITE);
delay_ms(200);
}
  Show_Str(60,190,200,16,"OV7670 ????",16,0);
delay_ms(1500);    
TIM6_Int_Init(10000,7199);   
EXTI8_Init();
OV7670_Window_Set(10,174,240,320);   
  OV7670_CS=0;
  delay_ms(1800);
  usb_port_set(0); 
delay_ms(300);
    usb_port_set(1);    
  LCD_ShowString(60,170,200,16,16,"USB Connecting..."); 
    //USB????
  USB_Interrupts_Config();    
  Set_USBClock();   
  USB_Init();     
delay_ms(1800);         
  while(1)//死循环的逻辑不知道对不对。
{
key=KEY_Scan(0);?
if(key==KEY_UP)
{
LED1=0;
//BEEP=1;
LED0=0;
if(sd_ok)
{
LED1=0;
camera_new_pathname(pname);     
if(bmp_encode(pname,0,0,240,320,0))
{
Show_Str(40,130,240,12,"?????????í?ó!",12,0);  
}else 
{
Show_Str(40,130,240,12,"????????!",12,0);
Show_Str(40,150,240,12,"±?????:",12,0);
  Show_Str(40+42,150,240,12,pname,12,0);     
  BEEP=1;
delay_ms(100);
}
}
else
{     
Show_Str(40,130,240,12,"SD?¨?í?ó!",12,0);
  Show_Str(40,150,240,12,"??????????????!",12,0);     
  }
    //BEEP=0;
//LED1=1;
delay_ms(1000);
    if(USB_STA!=USB_STATUS_REG)
{      
LCD_Fill(60,190,240,190+16,WHITE);       
if(USB_STATUS_REG&0x01)
{
LCD_ShowString(60,250,200,16,16,"USB Writing...");  
}
if(USB_STATUS_REG&0x02)//??????
{
LCD_ShowString(60,250,200,16,16,"USB Reading...");  
}     
if(USB_STATUS_REG&0x04)LCD_ShowString(60,270,200,16,16,"USB Write Err ");
else// LCD_Fill(60,210,240,210+16,WHITE);  
if(USB_STATUS_REG&0x08)LCD_ShowString(60,270,200,16,16,"USB Read  Err ");
else //LCD_Fill(60,230,240,230+16,WHITE);
USB_STA=USB_STATUS_REG;
}
}else 
LED1=1;
  //BEEP=0;
LED0=1;
delay_ms(10);
  camera_refresh();
i++;
if(i==20)
{
i=0;
LED0=!LED0;
  }
if(Divece_STA!=bDeviceState) 
{
if(bDeviceState==CONFIGURED)LCD_ShowString(60,170,200,16,16,"USB Connected    ");
else LCD_ShowString(60,170,200,16,16,"USB DisConnected ");
Divece_STA=bDeviceState;
}
tct++;
if(tct==200)
{
tct=0;
LED0=!LED0;
if(USB_STATUS_REG&0x10)
{
offline_cnt=0;
bDeviceState=CONFIGURED;
}else
{
offline_cnt++;  
if(offline_cnt>10)bDeviceState=UNCONNECTED;
}
USB_STATUS_REG=0;
}
}              
}
因为要做毕设所以第一次接触stm32，以前51学的都不是很扎实，希望原子哥多多指点，最近自己瞎琢磨的已经有点醉了。