#include <windows.h>#include <stdio.h>//文件操作，訪問I/O全靠它了#include <conio.h>//控制臺I/O, getch()之類的#include <mmsystem.h>//多媒體的，我的程序中用到了多媒體定時器，一般windows定//時器，精度差。而多媒體定時器精度高，可精確到1mS.所以跟硬件打交道的時候就很//有用了。//下面的程序需要在project-->setting-->link中設(shè)置一下連接的庫，否則compile能通//過，link通不過也白搭。庫文件列表如下//kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib //shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib //kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib //shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib //winmm.lib//下面可以看我的程序了，這個程序是通過多媒體定時器每1mS,從串行口以115.2kbps的//波特率向外播放一個wave文件，弄這個干嗎？我的板子可以放歌了。呵呵。#define TIME_INTERVAL 1//定時間隔，mS單位static UINT MyTimerID;//訪問定時器的時候所用的定時器idstatic HANDLE hComm,hWaveFile;//串口和wave文件句柄static DCB Current_Comm_dcb = {0};//串口參數(shù)結(jié)構(gòu)體，波特率，流量控制，校驗//什么的static DCB Previous_Comm_dcb = {0};//同上static DWORD FileSize,rFileSize,PlayPosition;//一些變量，文件大小，播放指針static BYTE *FileBuffer;//文件緩沖區(qū)的指針，用malloc申請來的內(nèi)存給他static OVERLAPPED osWrite = {0};//對問建交疊操作所必需的一個結(jié)構(gòu)體。//交疊操作是指，用一個函數(shù)觸發(fā)一下操作，然后函數(shù)立刻返回了，這時候你可以干別的//操作完成后會給信號的。98不支持的，2000和nt才支持。BOOL WriteABuffer(BYTE * lpBuf, DWORD dwToWrite)//將lpBuf所只想的緩沖區(qū)中//dwToWrite個字節(jié)通過串口發(fā)出。{   static DWORD dwWritten;   static BOOL fRes;   // Issue write.   if (!WriteFile(hComm, lpBuf, dwToWrite, &dwWritten, &osWrite)) {      if (GetLastError() != ERROR_IO_PENDING) {         // WriteFile failed, but it isn't delayed. Report error and abort.         fRes = FALSE;      }      else {         // Write is pending.         if (!GetOverlappedResult(hComm, &osWrite, &dwWritten, TRUE))            fRes = FALSE;         else            // Write operation completed successfully.            fRes = TRUE;      }   }   else      // WriteFile completed immediately.      fRes = TRUE;// CloseHandle(osWrite.hEvent);   return fRes;}void WINAPI TimerEventProc(UINT wTimerID, UINT msg,DWORD dwUser, DWORD dw1, DWORD dw2)//這個函數(shù)是定時器的回掉函數(shù)，定時事件發(fā)生后，它自動被調(diào)用。//我在這個函數(shù)里發(fā)送8個字節(jié)。{ static long delay=2000,j; WriteABuffer(&((BYTE)FileBuffer[PlayPosition]),1); PlayPosition++;// for(j=0;j<delay;j++); WriteABuffer(&((BYTE)FileBuffer[PlayPosition]),1); PlayPosition++;// for(j=0;j<delay;j++); WriteABuffer(&((BYTE)FileBuffer[PlayPosition]),1); PlayPosition++;// for(j=0;j<delay;j++); WriteABuffer(&((BYTE)FileBuffer[PlayPosition]),1); PlayPosition++;// for(j=0;j<delay;j++); WriteABuffer(&((BYTE)FileBuffer[PlayPosition]),1); PlayPosition++;// for(j=0;j<delay;j++); WriteABuffer(&((BYTE)FileBuffer[PlayPosition]),1); PlayPosition++;// for(j=0;j<delay;j++); WriteABuffer(&((BYTE)FileBuffer[PlayPosition]),1); PlayPosition++;// for(j=0;j<delay;j++); WriteABuffer(&((BYTE)FileBuffer[PlayPosition]),1); PlayPosition++;// for(j=0;j<delay;j++);}BOOL InitializeTimer(UINT *TimerID,UINT TimeInterval)//初始化定時器{ TIMECAPS tc; if(timeGetDevCaps(&tc, sizeof(TIMECAPS))==TIMERR_NOERROR) {  /*if(TIME_INTERVAL>=minforeach (foreach (function ()  {  }$array as $key => $value) {  }$array as $value) {  }(max(tc.wPeriodMin,1),tc.wPeriodMax))*/if(TimeInterval>=min(max(tc.wPeriodMin,1),tc.wPeriodMax))  {   timeBeginPeriod(TIME_INTERVAL);   printf("1\n");   getch();  }  else  {   return(FALSE);  } } else {  return(FALSE); } if(!((*TimerID)=timeSetEvent(TIME_INTERVAL,TIME_INTERVAL,(LPTIMECALLBACK) 	 TimerEventProc,(DWORD)1,TIME_PERIODIC))) {	 printf("2\n");	 getch();  return(FALSE); } else {	 printf("3\n");	 return(TRUE); }}void FreeTimer(UINT *TimerID, UINT TimeInterval)//釋放定時器，如果忘了釋放，嘿嘿。。{ timeKillEvent((*TimerID)); timeEndPeriod(TimeInterval);}void fbc(void)//普通二進制轉(zhuǎn)折疊二進制編碼，這是pcm編碼標準必須的//對大家沒什么用{DWORD j;int i;BYTE rom[256];for(i=0;i<128;i++)rom[i]=127-i;for(;i<256;i++)rom[i]=rom[255-i]+128;for(j=0;j<FileSize;j++){//FileBuffer[j]=FileBuffer[j]/2;FileBuffer[j] = rom[FileBuffer[j]];}}int main(int argc,char *argv[])//主函數(shù)開始了，睜大眼睛。{printf("Writen by jxj.2001.5. All rights reserved\n\n");//版權(quán)。if(argc<2){ printf("Require wave_File name!\n"); getch(); exit(1);}//wave文件名從命令行給PlayPosition=0;//播放指針回零printf("Open serial communication port ... ");//下面是怎么打開串口hComm = CreateFile( "com1",                    GENERIC_READ | GENERIC_WRITE,                    0,                    0,                    OPEN_EXISTING,                    FILE_FLAG_OVERLAPPED,//這個參數(shù)表明是交疊方式打開                    0);if (hComm == INVALID_HANDLE_VALUE){ printf("error!\n"); getch(); return(1);}else{ printf("successful!\n");}FillMemory(&Previous_Comm_dcb, sizeof(Previous_Comm_dcb), 0);FillMemory(&Current_Comm_dcb, sizeof(Current_Comm_dcb), 0);Previous_Comm_dcb.DCBlength = sizeof(Previous_Comm_dcb);Current_Comm_dcb.DCBlength = sizeof(Current_Comm_dcb);printf("Get previous CommState ... ");//得到當前串口設(shè)置if (!GetCommState(hComm, &Previous_Comm_dcb)){ printf("error!\n"); getch(); return(1);}else{ printf("successful!\n");}printf("Set current CommState ... ");//寫一個你需要的串口設(shè)置的結(jié)構(gòu)Current_Comm_dcb = Previous_Comm_dcb;Current_Comm_dcb.BaudRate = 115200;Current_Comm_dcb.fBinary = TRUE;Current_Comm_dcb.fParity = TRUE;Current_Comm_dcb.StopBits = ONESTOPBIT;Current_Comm_dcb.fDtrControl = DTR_CONTROL_DISABLE;Current_Comm_dcb.fRtsControl = RTS_CONTROL_DISABLE;Current_Comm_dcb.ByteSize = 8;Current_Comm_dcb.Parity = ODDPARITY;Current_Comm_dcb.fOutX = FALSE;Current_Comm_dcb.fInX = FALSE;//設(shè)置進入串口if (!SetCommState(hComm, &Current_Comm_dcb)){ printf("error!\n"); getch(); return(1);}else{ printf("successful!\n");}printf("Open WaveFile ... ");//打開普通的wave文件hWaveFile = CreateFile( argv[1],                    GENERIC_READ | GENERIC_WRITE,                    0,                    0,                    OPEN_EXISTING,                    FILE_ATTRIBUTE_NORMAL,                    0);if (hWaveFile == INVALID_HANDLE_VALUE){ printf("error!\n"); getch(); return(1);}else{ printf("successful!\n");}printf("Get file size ...");//獲得文件大小，以便確定申請多大內(nèi)存if (!(FileSize=GetFileSize(hWaveFile,NULL))){ printf("error!\n"); getch(); return(1);}else{ printf("%ld successful!\n",FileSize);}printf("Apply memory ... ");//申請內(nèi)存if (!(FileBuffer = (BYTE *)malloc(FileSize))){ printf("error!\n"); getch(); return(1);}else{ printf("successful!\n");}printf("Fill the FileBuffer with WaveFile ... ");//文件放入內(nèi)存if(!ReadFile(hWaveFile,FileBuffer,FileSize,&rFileSize,NULL)){ printf("error!\n"); getch(); return(1);}else{ if(FileSize!=rFileSize) {  printf("error!\n");  getch();  return(1); } printf("successful!\n");}fbc();printf("Initialize write ... ");//準備以交疊的方式寫串口osWrite.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);//結(jié)構(gòu)初始化一下if (osWrite.hEvent == NULL){ printf("error!\n"); getch(); return(1);}else{ printf("successful!\n");}printf("Initialize Timer ... ");//定時器初始化if (!InitializeTimer(&MyTimerID,TIME_INTERVAL)){ printf("error!\n"); getch(); return(1);}else{ printf("successful!\n");}while(PlayPosition<FileSize);//等待播放完畢 FreeTimer(&MyTimerID,TIME_INTERVAL); printf("Recover the previous CommState ... "); if (!SetCommState(hComm, &Previous_Comm_dcb)) {  printf("error!\n");  getch();  return(1); } else {  printf("successful!\n"); } CloseHandle(osWrite.hEvent); CloseHandle(hComm); CloseHandle(hWaveFile); return(0);}//我的板子上用的FLEX10K10LC84-4 FPGA芯片來通過MAX232電平轉(zhuǎn)換接受，F(xiàn)PGA當中通信//用的UART是從QUICKLOGIC公司下載的免費IP核。//當然還有一個碼速調(diào)整問題，因為115.2kbps最高實現(xiàn)8kHz,8bit的音頻，定時精度達不到//8k,只能到1k,所以1mS發(fā)送8個字節(jié)，這8個是連在一起的.在fpga內(nèi)部將它們在1mS之內(nèi)//散開。實現(xiàn)均勻的8k.//8k 8bit自然是很不爽，后來用并口實現(xiàn)了48k 8bit,可以忍受了。