207 lines
5.4 KiB
C
207 lines
5.4 KiB
C
//
|
|
// 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);
|
|
|
|
}
|
|
|
|
}
|