下面的代码，是在ucosii以及emwin下，实现一个frame，然后判断U盘是否挂载好，最后将flash上的数据写入到U盘中。
但是点击按钮写入1次，我点击3次，便会出现HardFault。
调试后发现:CFSR 00 00 82 00,HFSR 40 00 00 00  
查手册，发现CFSR寄存器对应的错误为BFARVALID以及PRECISERR 
我只知道大概是这段代码引起的错误，但是却不知道具体的问题，我把代码贴上来，请各位大神瞅瞅

[mw_shl_code=c,true]//u盘写入 void Write_usb(void) { FIL fsrc; FIL fusb; FRESULT ret; UINT bw ; UINT br ; u8 buf[50]; u8 i=0; // OS_CPU_SR cpu_sr=0; nber = 0; dcm10 = 0; dcm100 = 0; ret = f_open(&fsrc,sfname,FA_READ); //读取flash 的数据 //打开flash //FR_NOT_ENOUGH_CORE if(ret==FR_OK) //flash 文件打开成功 { ret = f_open(&fusb,suname,FA_CREATE_NEW | FA_WRITE); //在U盘上新建文件夹 while (ret!=FR_OK) { nber=nber+1; //当nber加到255后怎么办 if(nber==0xFF)break; if(nber%100) { if(nber%10) { i=nber%10; suname[7]=i+0x30; } else { dcm10=dcm10+1; suname[6]=dcm10+0x30; suname[7]=0x30; if(dcm10>8) dcm10=0xFF; } } else { dcm100=dcm100+1; suname[5]=dcm100+0x30; suname[6]=0x30; suname[7]=0x30; if(dcm100>8) dcm100=0xFF; } ret = f_open(&fusb,suname,FA_CREATE_NEW | FA_WRITE); } if(ret==FR_OK) //如果新建成功 便进行写入 { while(1) { // OS_ENTER_CRITICAL(); //进入临界区,关闭中断 f_read(&fsrc,buf,30,&br); if(br>0) { for(i=0;i<30;i++) { if(buf==0x20) buf=','; } f_write(&fusb,buf,br,&bw); } else { TEXT_SetText(Text_2,suname); TEXT_SetText(Text_3,"Save Success"); // Show_Str(30,250,200,16,"数据已经输完",16,0); break; } } // OS_EXIT_CRITICAL(); //退出临界区,开中断 f_close(&fusb); //关闭优盘 } else TEXT_SetText(Text_3,"New File Failed!"); f_close(&fsrc); //关闭flash } else TEXT_SetText(Text_3,"Flash Failed!"); } //U盘操作界面 void Usb_Interface(void) // usb 显示 { FRAMEWIN_Handle hFrame; BUTTON_Handle hButton_TRANSMISSION; BUTTON_Handle hButton_CLOSE; TEXT_Handle Text_1; // TEXT_Handle Text_2; // OS_CPU_SR cpu_sr=0; int tem=0; FRESULT res; u8 sign=0; u8 i=0; char warn_show[5]="/0"; //U盘 界面初始化 hFrame = FRAMEWIN_CreateEx(30, 200, 420,460,WM_HBKWIN ,WM_CF_SHOW,0,14,"USB Flash Disk",0); //桌面窗口 句柄？WM_HBKWIN FRAMEWIN_SetActive(hFrame,1); FRAMEWIN_SetTitleHeight(hFrame,30); FRAMEWIN_SetFont(hFrame,&GUI_FontComic24B_ASCII); // FRAMEWIN_SetText(hFrame,"USB Flash Disk"); Text_1 = TEXT_CreateAsChild(0,30,420,100,hFrame,17,WM_CF_SHOW,"",TEXT_CF_HCENTER|TEXT_CF_VCENTER); TEXT_SetFont(Text_1,&GUI_FontIcpFont48B); Text_2 = TEXT_CreateAsChild(0,30,420,300,hFrame,18,WM_CF_SHOW,"",TEXT_CF_HCENTER|TEXT_CF_VCENTER); TEXT_SetFont(Text_2,&GUI_FontIcpFont48B); Text_3 = TEXT_CreateAsChild(0,30,420,500,hFrame,19,WM_CF_SHOW,"",TEXT_CF_HCENTER|TEXT_CF_VCENTER); TEXT_SetFont(Text_3,&GUI_FontIcpFont48B); hButton_CLOSE = BUTTON_CreateAsChild(320, 350, 80, 70, hFrame, 16, WM_CF_SHOW); BUTTON_SetFont(hButton_CLOSE,&GUI_FontComic24B_ASCII); BUTTON_SetText(hButton_CLOSE,"Exit"); while(1) { GUI_TOUCH_Exec(); tem=GUI_GetKey(); USBH_Process(&USB_OTG_Core, &USB_Host); if(HCD_IsDeviceConnected(&USB_OTG_Core)) //插U盘 { if(usb_flag==1) { TEXT_SetText(Text_1,"USB Connected"); if(sign==0) { // TEXT_SetText(Text_2,""); // TEXT_SetText(Text_3,""); hButton_TRANSMISSION = BUTTON_CreateAsChild(20, 350, 80, 70, hFrame, 15, WM_CF_SHOW); BUTTON_SetFont(hButton_TRANSMISSION,&GUI_FontComic24B_ASCII); BUTTON_SetText(hButton_TRANSMISSION,"Save"); sign=1; } if(tem==15) //SEND { Sound(50); Write_usb(); } } } else //未插U盘 { if(sign==1) { BUTTON_Delete(hButton_TRANSMISSION); // GUI_Clear(); sign = 0; } TEXT_SetText(Text_1,"USB Unconnected"); TEXT_SetText(Text_2,""); TEXT_SetText(Text_3,""); } if(tem==16) //Exit { Sound(50); // res=f_mount(0,"2:",1); //卸载 U 盘 // if(res==FR_OK) // { FRAMEWIN_Delete(hFrame);// WM_SetDesktopColor P292 桌面窗口 删除控件以后 需要重绘 WM_SetDesktopColor(GUI_DBLUE); GUI_Delay(1); //为了刷新界面 也让ICP能够显示 一定是放這裡 GUI_SetFont(&GUI_FontICPfont150); GUI_DispStringAt("ICP",60,10); if(data[0]=='a') Wave_init(); GUI_SetColor(GUI_WHITE); GUI_SetFont(&GUI_Font24B_1); sprintf(warn_show,"%d",warn_high); //显示high GUI_DispStringAt("Top Limit: ",100,470); //11 121 GUI_DispStringAtCEOL(warn_show,205,470); // sprintf(warn_show,"%d",warn_low); //显示low GUI_DispStringAt("Lower Limit: ",280,470); //13 240 GUI_DispStringAtCEOL(warn_show,405,470); // 365 break; // } } // OS_ENTER_CRITICAL(); GUI_Delay(10); // OS_EXIT_CRITICAL(); } }[/mw_shl_code]