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//
// Read from the comm 1 char at a time.
//
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "windows.h"
#define BIGREAD 256000
unsigned char readbuff[BIGREAD];
void main(int argc,char *argv[]) {
HANDLE hFile; DCB MyDcb; char *MyPort = "COM1"; DWORD NumberActuallyRead; DWORD NumberToRead = 0; DWORD UseBaud = 19200; COMMTIMEOUTS To;
if (argc > 1) {
sscanf(argv[1],"%d",&NumberToRead);
if (argc > 2) {
sscanf(argv[2],"%d",&UseBaud);
if (argc > 3) {
MyPort = argv[3];
}
}
}
printf("Will try to read %d characters.\n",NumberToRead); printf("Will try to read a %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);
To.ReadIntervalTimeout = 0; To.ReadTotalTimeoutMultiplier = ((1000+(((UseBaud+9)/10)-1))/((UseBaud+9)/10)); if (!To.ReadTotalTimeoutMultiplier) { To.ReadTotalTimeoutMultiplier = 1; } printf("Multiplier is: %d\n",To.ReadTotalTimeoutMultiplier); To.ReadTotalTimeoutConstant = 5000; To.WriteTotalTimeoutMultiplier = 0; 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 = 8; MyDcb.Parity = NOPARITY; MyDcb.StopBits = ONESTOPBIT;
if (SetCommState( hFile, &MyDcb )) {
DWORD CurrentReadIt = 0; DWORD CurrentActualRead = 0; unsigned char j; DWORD TotalCount;
NumberActuallyRead = 0; printf("We successfully set the state of the %s port.\n",MyPort);
printf("Hit any 1 <cr> to start reading: "); scanf("%d",&CurrentReadIt); for ( CurrentReadIt = 0; CurrentReadIt < NumberToRead; CurrentReadIt++ ) {
if (ReadFile( hFile, &readbuff[CurrentReadIt], 1, &CurrentActualRead, NULL )) {
if (CurrentActualRead != 1) {
printf("Iteration %d read %d\n",CurrentReadIt,CurrentActualRead); break;
} else {
NumberActuallyRead++;
}
} else {
DWORD LastError; LastError = GetLastError(); printf("Status of failed %d read is: %x\n",CurrentReadIt,LastError); break;
}
}
printf("Number actually read %d.\n",NumberActuallyRead); printf("Now we check the data\n");
for ( TotalCount = 0; TotalCount < NumberActuallyRead; ) {
for ( j = 0; j <= 9; j++ ) {
if (readbuff[TotalCount] != j) {
printf("Bad data starting at: %d\n",TotalCount); goto donewithcheck;
}
TotalCount++; if (TotalCount >= NumberActuallyRead) {
break;
}
}
}donewithcheck:;
} 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);
}
}
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