关于在STM32F1上的LCD7显示OV7670的图像时，LCD为啥显示不了其他字符？

RENGFORMENT

以下是程序，我只在更新图像函数里添加了几行代码
#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "lcd.h"
#include "usart.h"  
#include "string.h"
#include "ov7670.h"
#include "tpad.h"
#include "timer.h"
#include "exti.h"
#include "usmart.h"


const u8*LMODE_TBL[5]={"Auto","Sunny","Cloudy","Office","Home"};   
const u8*EFFECTS_TBL[7]={"Normal","Negative","B&W","Redish","Greenish","Bluish","Antique"};
extern u8 ov_sta;
extern u8 ov_frame;


void camera_refresh(void)
{
u8 R,G,B;
u32 j;
   u16 color;
if(ov_sta）
{
  LCD_Scan_Dir(U2D_L2R);  
  if(lcddev.id==0X1963)LCD_Set_Window((lcddev.width-240)/2,(lcddev.height-320)/2,240,320);//
  else if(lcddev.id==0X5510||lcddev.id==0X5310)LCD_Set_Window((lcddev.width-320)/2,(lcddev.height-240)/2,320,240);//
  LCD_WriteRAM_Prepare();     
  OV7670_RRST=0;   
  OV7670_RCK_L;
  OV7670_RCK_H;
  OV7670_RCK_L;
  OV7670_RRST=1;   
  OV7670_RCK_H;
  for(j=0;j<76800;j++)
  {
   OV7670_RCK_L;
   color=GPIOC->IDR&0XFF;
   OV7670_RCK_H;
   color<<=8;  
   OV7670_RCK_L;
   color|=GPIOC->IDR&0XFF;
   OV7670_RCK_H;
   LCD->LCD_RAM=color;   

   R=(color>>11)&0xFF;
     G=(color&0x07E0>>5)&0xFF;
     B=(color&0X001F)&0xFF;
      LCD_ShowxNum(0,0,R,4,16,0);
   LCD_ShowxNum(40,40,G,4,16,0);
   LCD_ShowxNum(80,80,B,4,16,0);   
  }            
   ov_sta=0;   
  ov_frame++;
  LCD_Scan_Dir(DFT_SCAN_DIR);
}
}   

RENGFORMENT

求助原子哥

RENGFORMENT

这是图像结果，很是不懂为啥会这样？