OV7725摄像头的问题，320*240显示正常，改成640*480以后就显示错位了，求大神解答

blooddream2048 · 发表于 2015-1-8 17:44:51

图像分成了三块，改了好久也没改成功，求解啊~
下面是截图程序：

[mw_shl_code=c,true]int Camera_shot(unsigned short int Width,\ unsigned short int Height,\ unsigned char *filename) { bmp 文件头 54个字节 * unsigned char header[54] = { 0x42, 0x4d, 0, 0, 0, 0, 0, 0, 0, 0, 54, 0, 0, 0, 40,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; int i; int j; long file_size; long width; long height; float Y; unsigned char gray; unsigned char r,g,b; unsigned char tmp_name[30]; unsigned int mybw; unsigned int read_data; char kk[4]={0,0,0,0}; /* 宽*高 +补充的字节 + 头部信息 */ file_size = (long)Width * (long)Height + Height*(Width%4) + 54; /* 文件大小 4个字节 */ header[2] = (unsigned char)(file_size &0x000000ff); header[3] = (file_size >> 8) & 0x000000ff; header[4] = (file_size >> 16) & 0x000000ff; header[5] = (file_size >> 24) & 0x000000ff; /* 位图宽 4个字节 */ width=Width; header[18] = width & 0x000000ff; header[19] = (width >> 8) &0x000000ff; header[20] = (width >> 16) &0x000000ff; header[21] = (width >> 24) &0x000000ff; /* 位图高 4个字节 */ height = Height; header[22] = height &0x000000ff; header[23] = (height >> 8) &0x000000ff; header[24] = (height >> 16) &0x000000ff; header[25] = (height >> 24) &0x000000ff; /* 将filename 按照一定的格式拷贝到 tmp_name */ sprintf((char*)tmp_name,"0:%s.bmp",filename); /* 注册一个工作区，逻辑号为0 */ f_mount(0, &bmpfs[0]); #if 0 /* 新建一个文件 */ bmpres = f_open( &bmpfsrc , (char*)tmp_name, FA_CREATE_NEW | FA_WRITE ); /* 新建文件之后要先关闭再打开才能写入 */ f_close(&bmpfsrc); bmpres = f_open( &bmpfsrc , (char*)tmp_name, FA_OPEN_EXISTING | FA_WRITE); #else bmpres = f_open( &bmpfsrc , (char*)tmp_name, FA_OPEN_ALWAYS | FA_WRITE); #endif if ( bmpres == FR_OK ) { /* 将预先定义好的bmp头部信息写进文件里面 */ bmpres = f_write(&bmpfsrc, header,sizeof(unsigned char)*54, &mybw); //FIFO_PREPARE; /* 下面是将指定窗口的数据读出来写到文件里面去 */ for(i=0; i<Height; i++) { if( !(Width%4) ) /* 刚好是4字节对齐 */ { for(j=0; j<Width; j++) { READ_FIFO_PIXEL(read_data); //read_data = pixel_data(); /*直接从FIFO中读取像素数据*/ r = GETR_FROM_RGB16(read_data); g = GETG_FROM_RGB16(read_data); b = GETB_FROM_RGB16(read_data); Y=((float)(r*299 + g*587 + b*140)+500)/1000; gray=(unsigned char)Y; bmpres = f_write(&bmpfsrc, &gray,sizeof(unsigned char), &mybw); //bmpres = f_write(&bmpfsrc, &b,sizeof(unsigned char), &mybw); //bmpres = f_write(&bmpfsrc, &g,sizeof(unsigned char), &mybw); //bmpres = f_write(&bmpfsrc, &r,sizeof(unsigned char), &mybw); } } else { for(j=0;j<Width;j++) { read_data = pixel_data(); r = GETR_FROM_RGB16(read_data); g = GETG_FROM_RGB16(read_data); b = GETB_FROM_RGB16(read_data); Y=((float)(r*299 + g*587 + b*140)+500)/1000; gray=(unsigned char)Y; bmpres = f_write(&bmpfsrc, &gray,sizeof(unsigned char), &mybw); //bmpres = f_write(&bmpfsrc, &b,sizeof(unsigned char), &mybw); //bmpres = f_write(&bmpfsrc, &g,sizeof(unsigned char), &mybw); //bmpres = f_write(&bmpfsrc, &r,sizeof(unsigned char), &mybw); } /* 不是4字节对齐则需要补齐 */ bmpres = f_write(&bmpfsrc, kk,sizeof(unsigned char)*(Width%4), &mybw); } }/* 截屏完毕 */ f_close(&bmpfsrc); return 0; } else if ( bmpres == FR_EXIST ) //如果文件已经存在 { return FR_EXIST; //8 } else/* 截图失败 */ { return -1; } } [/mw_shl_code]

下面是ov7725场中断服务程序：

[mw_shl_code=c,true]/* ov7725 场中断服务程序 */ void EXTI0_IRQHandler(void) { if ( EXTI_GetITStatus(EXTI_Line0) != RESET ) //检查EXTI_Line0线路上的中断请求是否发送到了NVIC { if( Ov7725_vsync == 0 ) { FIFO_WRST_L(); //拉低使FIFO写(数据from摄像头)指针复位 FIFO_WE_H(); //拉高使FIFO写允许 Ov7725_vsync = 1; FIFO_WE_H(); //使FIFO写允许 FIFO_WRST_H(); //允许使FIFO写(数据from摄像头)指针运动 } else if( Ov7725_vsync == 1 ) { FIFO_WE_L(); //拉低使FIFO写暂停 Ov7725_vsync = 2; } EXTI_ClearITPendingBit(EXTI_Line0); //清除EXTI_Line0线路挂起标志位 } }[/mw_shl_code]