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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "windows.h"
#define BIGREAD 256000
unsigned char readbuff[BIGREAD];unsigned char writebuff[BIGREAD];
unsigned char DataMask[9] = {0,0,0,0,0x0f,0x1f,0x3f,0x7f,0xff};
void main(int argc,char *argv[]) {
HANDLE hFile; DCB MyDcb; char *MyPort = "COM1"; DWORD NumberActuallyRead; DWORD NumberToRead = 0; DWORD NumberActuallyWritten; DWORD NumberToWrite = 0; DWORD UseBaud = 19200; DWORD NumberOfDataBits = 8; COMMTIMEOUTS To; OVERLAPPED ReadOl = {0}; OVERLAPPED WriteOl = {0}; unsigned char j; DWORD TotalCount; BOOL ReadDone; BOOL WriteDone;
if (argc > 1) {
sscanf(argv[1],"%d",&NumberToRead); NumberToWrite = NumberToRead;
if (argc > 2) {
sscanf(argv[2],"%d",&UseBaud);
if (argc > 3) {
MyPort = argv[3];
if (argc > 4) {
sscanf(argv[4],"%d",&NumberOfDataBits);
}
}
}
}
printf("Will try to read/write %d characters.\n",NumberToRead); printf("Will try to read/write at %d baud.\n",UseBaud); printf("Using port %s\n",MyPort);
for ( TotalCount = 0; TotalCount < NumberToWrite; ) {
for ( j = (0xff - 10); j != 0; // When it wraps around
j++ ) {
writebuff[TotalCount] = j; TotalCount++; if (TotalCount >= NumberToWrite) {
break;
}
}
}
if (!(ReadOl.hEvent = CreateEvent( NULL, FALSE, FALSE, NULL ))) {
printf("Could not create the read event.\n"); goto cleanup;
} else {
ReadOl.Internal = 0; ReadOl.InternalHigh = 0; ReadOl.Offset = 0; ReadOl.OffsetHigh = 0;
}
if (!(WriteOl.hEvent = CreateEvent( NULL, FALSE, FALSE, NULL ))) {
printf("Could not create the write event.\n"); goto cleanup;
} else {
WriteOl.Internal = 0; WriteOl.InternalHigh = 0; WriteOl.Offset = 0; WriteOl.OffsetHigh = 0;
}
if ((hFile = CreateFile( MyPort, GENERIC_READ | GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL )) != ((HANDLE)-1)) {
printf("We successfully opened the %s port.\n",MyPort);
To.ReadIntervalTimeout = 0; To.ReadTotalTimeoutMultiplier = ((1000+(((UseBaud+9)/10)-1))/((UseBaud+9)/10)); if (!To.ReadTotalTimeoutMultiplier) { To.ReadTotalTimeoutMultiplier = 1; } To.WriteTotalTimeoutMultiplier = ((1000+(((UseBaud+9)/10)-1))/((UseBaud+9)/10)); if (!To.WriteTotalTimeoutMultiplier) { To.WriteTotalTimeoutMultiplier = 1; } printf("Multiplier is: %d\n",To.ReadTotalTimeoutMultiplier); To.ReadTotalTimeoutConstant = 5000; To.WriteTotalTimeoutConstant = 5000;
if (SetCommTimeouts( hFile, &To )) {
//
// We've successfully opened the file. Set the state of
// the comm device. First we get the old values and
// adjust to our own.
//
if (!GetCommState( hFile, &MyDcb )) {
printf("Couldn't get the comm state: %d\n",GetLastError()); exit(1);
}
MyDcb.BaudRate = UseBaud; MyDcb.ByteSize = (BYTE)NumberOfDataBits; MyDcb.Parity = NOPARITY; MyDcb.StopBits = ONESTOPBIT;
if (SetCommState( hFile, &MyDcb )) {
printf("We successfully set the state of the %s port.\n",MyPort);
//
// Sleep for 5 seconds so both sides can "synchronize".
//
Sleep(5000);
ReadDone = ReadFile( hFile, readbuff, NumberToRead, &NumberActuallyRead, &ReadOl );
if (!ReadDone) {
DWORD LastError; LastError = GetLastError();
if (LastError != ERROR_IO_PENDING) {
printf("Couldn't read the %s device.\n",MyPort); printf("Status of failed read is: %x\n",LastError); goto cleanup;
}
}
WriteDone = WriteFile( hFile, writebuff, NumberToWrite, &NumberActuallyWritten, &WriteOl );
if (!WriteDone) {
DWORD LastError; LastError = GetLastError();
if (LastError != ERROR_IO_PENDING) {
printf("Couldn't write the %s device.\n",MyPort); printf("Status of failed write is: %x\n",LastError); goto cleanup;
}
}
//
// We'll wait for the read to complete.
//
if (!GetOverlappedResult( hFile, &ReadOl, &NumberActuallyRead, TRUE )) {
DWORD LastError; LastError = GetLastError();
printf("Couldn't read the %s device.\n",MyPort); printf("Status of failed read is: %x\n",LastError);
} else {
printf("Well we thought the read went ok.\n"); printf("Number actually read %d.\n",NumberActuallyRead); printf("Now we check the data\n");
for ( TotalCount = 0; TotalCount < NumberActuallyRead; ) {
for ( j = (0xff - 10); j != 0; // When it wraps around.
j++ ) {
if (readbuff[TotalCount] != (j & DataMask[NumberOfDataBits])) {
printf("Bad data starting at: %d\n",TotalCount); printf("readbuff[TotalCount]: %x\n",readbuff[TotalCount]); printf("(j & DataMask[NumberOfDataBits]): %x\n",(j & DataMask[NumberOfDataBits])); goto donewithcheck;
}
TotalCount++; if (TotalCount >= NumberActuallyRead) {
break;
}
}
}
}
donewithcheck: ;
//
// We'll wait for the write to complete.
//
if (!GetOverlappedResult( hFile, &WriteOl, &NumberActuallyWritten, TRUE )) {
DWORD LastError; LastError = GetLastError();
printf("Couldn't write the %s device.\n",MyPort); printf("Status of failed write is: %x\n",LastError); goto cleanup;
} else {
printf("Well we thought the write went ok.\n"); printf("Number actually written %d.\n",NumberActuallyWritten);
}
} else {
DWORD LastError; LastError = GetLastError(); printf("Couldn't set the %s device.\n",MyPort); printf("Status of failed set is: %x\n",LastError);
}
} else {
DWORD LastError; LastError = GetLastError(); printf("Couldn't set the %s device timeouts.\n",MyPort); printf("Status of failed timeouts is: %x\n",LastError);
}
CloseHandle(hFile);
} else {
DWORD LastError; LastError = GetLastError(); printf("Couldn't open the %s device.\n",MyPort); printf("Status of failed open is: %x\n",LastError);
}
cleanup:;
}
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