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// This is special in that it trys to cause an interval timeout.
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "windows.h"
#define BIGWRITE 256000
unsigned char writebuff[BIGWRITE];
void main(int argc,char *argv[]) {
HANDLE hFile; DCB MyDcb; char *MyPort = "COM1"; DWORD NumberActuallyWritten; DWORD NumberToWrite = 0; DWORD UseBaud = 19200; COMMTIMEOUTS To;
if (argc > 1) {
sscanf(argv[1],"%d",&NumberToWrite);
if (argc > 2) {
sscanf(argv[2],"%d",&UseBaud);
if (argc > 3) {
MyPort = argv[3];
}
}
}
if (((NumberToWrite / 2)*2) != NumberToWrite) {
printf("Number to write must be even!\n"); exit(1);
}
printf("Will try to write %d characters.\n",NumberToWrite); printf("Will try to write at %d baud.\n",UseBaud); printf("Using port: %s\n",MyPort);
if ((hFile = CreateFile( MyPort, GENERIC_READ | GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL )) != ((HANDLE)-1)) {
printf("We successfully opened the %s port.\n",MyPort);
//
// 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);
}
if (!GetCommTimeouts( hFile, &To )) {
printf("Couldn't get the timeouts: %d\n",GetLastError()); exit(1);
}
To.ReadIntervalTimeout = 0; To.ReadTotalTimeoutMultiplier = 0; To.ReadTotalTimeoutConstant = 0; To.WriteTotalTimeoutMultiplier = 0; To.WriteTotalTimeoutConstant = 0;
if (!SetCommTimeouts( hFile, &To )) {
printf("Couldn't set the timeouts: %d\n",GetLastError()); exit(1);
}
MyDcb.BaudRate = UseBaud; MyDcb.ByteSize = 8; MyDcb.Parity = NOPARITY; MyDcb.StopBits = ONESTOPBIT;
if (SetCommState( hFile, &MyDcb )) {
unsigned char j; DWORD TotalCount;
printf("We successfully set the state of the %s port.\n",MyPort);
for ( TotalCount = 0; TotalCount < NumberToWrite; ) {
for ( j = 0; j <= 9; j++ ) {
writebuff[TotalCount] = j; TotalCount++; if (TotalCount >= NumberToWrite) {
break;
}
}
}
if (!WriteFile( hFile, writebuff, NumberToWrite/2, &NumberActuallyWritten, NULL )) {
DWORD LastError; LastError = GetLastError(); printf("Couldn't write the %s device.\n",MyPort); printf("Status of failed write is: %x\n",LastError);
} else if (NumberActuallyWritten != (NumberToWrite/2)) {
printf("Didn't write out the correct number: %d\n",NumberActuallyWritten);
}
//
// 15 seconds till the next write.
//
Sleep(15000);
if (!WriteFile( hFile, &writebuff[(NumberToWrite/2)], NumberToWrite/2, &NumberActuallyWritten, NULL )) {
DWORD LastError; LastError = GetLastError(); printf("Couldn't write the %s device.\n",MyPort); printf("Status of failed write is: %x\n",LastError);
} else if (NumberActuallyWritten != (NumberToWrite/2)) {
printf("Didn't write out the correct number: %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);
}
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);
}
}
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