298 lines
6.6 KiB
C
298 lines
6.6 KiB
C
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include "windows.h"
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#define BIGREAD 256000
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unsigned char readbuff[BIGREAD];
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int __cdecl main(int argc,char *argv[]) {
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HANDLE hFile;
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DCB MyDcb;
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char *MyPort = "COM1";
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DWORD NumberActuallyRead;
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DWORD NumberToRead = 0;
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DWORD UseBaud = 19200;
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COMMTIMEOUTS To;
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COMMPROP MyCommProp;
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DWORD numberReadSoFar;
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DWORD TotalCount;
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DWORD j;
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if (argc > 1) {
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sscanf(argv[1],"%d",&NumberToRead);
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if (argc > 2) {
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sscanf(argv[2],"%d",&UseBaud);
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if (argc > 3) {
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MyPort = argv[3];
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}
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}
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}
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printf("Will try to read %d characters.\n",NumberToRead);
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printf("Will try to read a %d baud.\n",UseBaud);
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printf("Using port %s\n",MyPort);
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if ((hFile = CreateFile(
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MyPort,
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GENERIC_READ | GENERIC_WRITE,
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0,
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NULL,
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CREATE_ALWAYS,
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FILE_ATTRIBUTE_NORMAL,
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NULL
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)) == ((HANDLE)-1)) {
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printf("Couldn't open the port - last error is: %d\n",GetLastError());
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exit(1);
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}
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printf("We successfully opened the %s port.\n",MyPort);
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To.ReadIntervalTimeout = 0;
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To.ReadTotalTimeoutMultiplier = ((1000+(((UseBaud+9)/10)-1))/((UseBaud+9)/10));
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if (!To.ReadTotalTimeoutMultiplier) {
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To.ReadTotalTimeoutMultiplier = 1;
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}
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printf("Multiplier is: %d\n",To.ReadTotalTimeoutMultiplier);
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To.ReadTotalTimeoutConstant = 5000;
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To.WriteTotalTimeoutMultiplier = 0;
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To.WriteTotalTimeoutConstant = 5000;
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if (!SetCommTimeouts(
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hFile,
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&To
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)) {
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printf("Couldn't set the timeouts - last error: %d\n",GetLastError());
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exit(1);
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}
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//
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// We've successfully opened the file. Set the state of
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// the comm device. First we get the old values and
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// adjust to our own.
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//
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if (!GetCommState(
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hFile,
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&MyDcb
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)) {
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printf("Couldn't get the comm state: %d\n",GetLastError());
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exit(1);
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}
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if (!GetCommProperties(
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hFile,
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&MyCommProp
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)) {
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printf("Couldn't get the comm prop: %d\n",GetLastError());
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exit(1);
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}
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//
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// Set the Xoff/xon limit so that it lowers the handshake
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// whenever we have more than 50 chars in our buffer,
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// and raises when we drop below 20.
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//
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MyDcb.XoffLim = MyCommProp.dwCurrentRxQueue - 50;
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MyDcb.XonLim = 20;
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MyDcb.BaudRate = UseBaud;
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MyDcb.ByteSize = 8;
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MyDcb.Parity = NOPARITY;
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MyDcb.StopBits = ONESTOPBIT;
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//
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// Make sure that the only flow control is input dtr.
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//
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MyDcb.fOutxDsrFlow = FALSE;
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MyDcb.fOutxCtsFlow = FALSE;
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MyDcb.fDsrSensitivity = FALSE;
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MyDcb.fOutX = FALSE;
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MyDcb.fInX = FALSE;
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MyDcb.fDtrControl = DTR_CONTROL_HANDSHAKE;
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MyDcb.fRtsControl = RTS_CONTROL_DISABLE;
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if (!SetCommState(
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hFile,
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&MyDcb
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)) {
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printf("Couldn't set the comm state - last error: %d\n",GetLastError());
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exit(1);
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}
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//
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// Read ten chars at a time until we get all the
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// chars or we get some kind of error.
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// We delay 100ms after each read to let the buffer
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// have a chance to fill up some.
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//
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for (
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numberReadSoFar = 0;
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numberReadSoFar < NumberToRead;
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) {
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if (ReadFile(
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hFile,
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&readbuff[numberReadSoFar],
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10,
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&NumberActuallyRead,
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NULL
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)) {
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//
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// If there was no characters (timed out), then
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// we probably won't see anything.
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//
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if (!NumberActuallyRead) {
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printf("No chars - Timeout! number read so far: %d\n",numberReadSoFar);
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break;
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}
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numberReadSoFar += NumberActuallyRead;
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Sleep(100);
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continue;
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} else {
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//
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// Some kind of read error.
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//
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DWORD LastError;
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LastError = GetLastError();
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printf("Couldn't read the %s device.\n",MyPort);
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printf("Status of failed read is: %d\n",LastError);
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//
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// Get the error word from clear comm error.
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//
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if (!ClearCommError(
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hFile,
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&LastError,
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NULL
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)) {
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printf("Couldn't call clear comm error: %d\n",GetLastError());
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exit(1);
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} else {
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if (!LastError) {
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printf("No LastError\n");
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} else {
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if (LastError & CE_RXOVER) {
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printf("Error: CE_RXOVER\n");
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}
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if (LastError & CE_OVERRUN) {
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printf("Error: CE_OVERRUN\n");
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}
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if (LastError & CE_RXPARITY) {
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printf("Error: CE_RXPARITY\n");
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}
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if (LastError & CE_FRAME) {
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printf("Error: CE_FRAME\n");
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}
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if (LastError & CE_BREAK) {
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printf("Error: CE_BREAK\n");
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}
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if (LastError & ~(CE_RXOVER |
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CE_OVERRUN |
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CE_RXPARITY |
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CE_FRAME |
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CE_BREAK)) {
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printf("Unknown errors: %x\n",LastError);
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}
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}
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}
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exit(1);
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}
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}
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for (
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TotalCount = 0;
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TotalCount < numberReadSoFar;
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) {
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for (
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j = 0;
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j <= 9;
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j++
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) {
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if (readbuff[TotalCount] != j) {
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printf("Bad data starting at: %d\n",TotalCount);
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goto donewithcheck;
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}
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TotalCount++;
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if (TotalCount >= numberReadSoFar) {
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break;
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}
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}
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}
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donewithcheck:;
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exit(1);
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}
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