* [OT] Serial comm in Win using C [Re: Could someone teach me how to use windows API serial port calls.]
2002-04-12 22:22 ` Dan Andreatta
@ 2002-04-12 22:31 ` Dan Andreatta
0 siblings, 0 replies; 3+ messages in thread
From: Dan Andreatta @ 2002-04-12 22:31 UTC (permalink / raw)
Dan Andreatta <andreatta@mail.chem.sc.edu.REMOVEME> wrote in
news:Xns91EEB1107559Eandreattamailchemsce@12.252.202.62:
> kz105@student.cs.york.ac.uk (Jamie) wrote in
> news:ba071575.0204121147.71bee262@posting.google.com:
>
>> Hi, there:
>>
>> I'm doing a project that needs an ada program under win2000 to control
>> a machine over RS232 serial line. I wonder if there are someone would
>> like teach me how to use windows API serial port calls to do it. since
>> i'm a beginner of programing, i think I need some detailed examples if
>> you could provide.
>>
>> Thanks in advance.
>>
>
> http://msdn.microsoft.com/library/default.asp?url=/library/en-
> us/dnwbgen/html/msdn_serial.asp
OK, I feel generous. These are quick hacks in C I used to test the
instrument. Compiled w/ MinGW GNU/C 2.8.1 (coming with GNAT 3.13p)
// Writes to COM3 and waits an answer
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
int main()
{
HANDLE hCom;
DCB dcb;
DWORD dwBytes,dwEvent;
COMMTIMEOUTS old_ct,new_ct = {100,0,0,0};
COMMPROP cp;
char wbuf[] = "DT0.9;DT;";
char rbuf[10] = "\0\0\0\0\0\0\0\0\0\0";
hCom = CreateFile(
"COM3",
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL );
GetCommState(hCom, &dcb);
dcb.BaudRate = 9600;
dcb.ByteSize = 8;
dcb.Parity = NOPARITY;
dcb.StopBits = ONESTOPBIT;
dcb.fDtrControl = 1;
dcb.fRtsControl = 1;
SetCommState(hCom, &dcb);
GetCommState(hCom, &dcb);
//GetCommTimeouts(hCom,&old_ct);
//SetCommTimeouts(hCom,&new_ct);
//SetupComm(hCom,128,128);
WriteFile(
hCom,
wbuf,
9,
&dwBytes,
NULL );
puts("Wrote DATA\n");
Sleep(500);
ReadFile(
hCom,
rbuf,
10,
&dwBytes,
NULL );
printf("Read %u bytes : '%s'\n",dwBytes,rbuf);
CloseHandle(hCom);
return EXIT_SUCCESS;
}
// Dumps the status on a serial port
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
int main()
{
HANDLE hCom;
DCB dcb;
COMMPROP commprop;
COMMTIMEOUTS timeouts;
FILE *f;
f=fopen("COM.txt","w");
hCom = CreateFile(
"COM1",
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL );
GetCommState(hCom, &dcb);
GetCommTimeouts(hCom, &timeouts);
GetCommProperties(hCom, &commprop);
fprintf(f,"DCB Structure:\n\
DWORD DCBlength = %u\n\
DWORD BaudRate = %u\n\
DWORD fBinary:1 = %u\n\
DWORD fParity:1 = %u\n\
DWORD fOutxCtsFlow:1 = %u\n\
DWORD fOutxDsrFlow:1 = %u\n\
DWORD fDtrControl:2 = %u\n\
DWORD fDsrSensitivity:1 = %u\n\
DWORD fTXContinueOnXoff:1 = %u\n\
DWORD fOutX:1 = %u\n\
DWORD fInX:1 = %u\n\
DWORD fErrorChar:1 = %u\n\
DWORD fNull:1 = %u\n\
DWORD fRtsControl:2 = %u\n\
DWORD fAbortOnError:1 = %u\n\
DWORD fDummy2:17 = %u\n\
WORD wReserved = %u\n\
WORD XonLim = %u\n\
WORD XoffLim = %u\n\
BYTE ByteSize = %u\n\
BYTE Parity = %u\n\
BYTE StopBits = %u\n\
char XonChar = %u\n\
char XoffChar = %u\n\
char ErrorChar = %u\n\
char EofChar = %u\n\
char EvtChar = %u\n\
WORD wReserved1; = %u\n",
dcb.DCBlength,
dcb.BaudRate, // current baud rate
dcb.fBinary, // binary mode, no EOF check
dcb.fParity, // enable parity checking
dcb.fOutxCtsFlow, // CTS output flow control
dcb.fOutxDsrFlow, // DSR output flow control
dcb.fDtrControl, // DTR flow control type
dcb.fDsrSensitivity, // DSR sensitivity
dcb.fTXContinueOnXoff, // XOFF continues Tx
dcb.fOutX, // XON/XOFF out flow control
dcb.fInX, // XON/XOFF in flow control
dcb.fErrorChar, // enable error replacement
dcb.fNull, // enable null stripping
dcb.fRtsControl, // RTS flow control
dcb.fAbortOnError, // abort reads/writes on error
dcb.fDummy2, // reserved
dcb.wReserved, // not currently used
dcb.XonLim, // transmit XON threshold
dcb.XoffLim, // transmit XOFF threshold
dcb.ByteSize, // number of bits/byte, 4-8
dcb.Parity, // 0-4=no,odd,even,mark,space
dcb.StopBits, // 0,1,2 = 1, 1.5, 2
dcb.XonChar, // Tx and Rx XON character
dcb.XoffChar, // Tx and Rx XOFF character
dcb.ErrorChar, // error replacement character
dcb.EofChar, // end of input character
dcb.EvtChar, // received event character
dcb.wReserved1); // reserved; do not use
fprintf(f,"\nCOMMPROP Structure:\n\
WORD wPacketLength = %u
WORD wPacketVersion = %u
DWORD dwServiceMask = %u
DWORD dwReserved1 = %u
DWORD dwMaxTxQueue = %u
DWORD dwMaxRxQueue = %u
DWORD dwMaxBaud = %u
DWORD dwProvSubType = %u
DWORD dwProvCapabilities = %u
DWORD dwSettableParams = %u
DWORD dwSettableBaud = %u
WORD wSettableData = %u
WORD wSettableStopParity = %u
DWORD dwCurrentTxQueue = %u
DWORD dwCurrentRxQueue = %u
DWORD dwProvSpec1 = %u
DWORD dwProvSpec2 = %u
WCHAR wcProvChar[1] = %u",
commprop.wPacketLength,
commprop.wPacketVersion,
commprop.dwServiceMask,
commprop.dwReserved1,
commprop.dwMaxTxQueue,
commprop.dwMaxRxQueue,
commprop.dwMaxBaud,
commprop.dwProvSubType,
commprop.dwProvCapabilities,
commprop.dwSettableParams,
commprop.dwSettableBaud,
commprop.wSettableData,
commprop.wSettableStopParity,
commprop.dwCurrentTxQueue,
commprop.dwCurrentRxQueue,
commprop.dwProvSpec1,
commprop.dwProvSpec2,
commprop.wcProvChar[1]);
printf("\
DTR_CONTROL_DISABLE : %d\n\
DTR_CONTROL_ENABLE : %d\n\
DTR_CONTROL_HANDSHAKE : %d\n",
DTR_CONTROL_DISABLE, DTR_CONTROL_ENABLE, DTR_CONTROL_HANDSHAKE);
printf("\
RTS_CONTROL_DISABLE : %d
RTS_CONTROL_ENABLE : %d
RTS_CONTROL_HANDSHAKE : %d
RTS_CONTROL_TOGGLE : %d\n",
RTS_CONTROL_DISABLE, RTS_CONTROL_ENABLE,
RTS_CONTROL_HANDSHAKE, RTS_CONTROL_TOGGLE);
CloseHandle(hCom);
fclose(f);
return EXIT_SUCCESS;
}
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