193 lines
3.3 KiB
C
193 lines
3.3 KiB
C
//
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// Test the get modem output signals ioctl.
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//
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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 "nt.h"
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#include "ntrtl.h"
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#include "nturtl.h"
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#include "windows.h"
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#include "ntddser.h"
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//
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// This program assumes that it is using a loopback connector.
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//
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#define MAX_CHECK 100000
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ULONG CheckValues[MAX_CHECK];
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ULONG ReadValues[MAX_CHECK];
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void main(int argc,char *argv[]) {
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HANDLE hFile;
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DCB MyDcb;
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ULONG mask;
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ULONG retSize;
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char *MyPort = "COM1";
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if (argc > 1) {
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MyPort = argv[1];
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}
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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 %s\n",MyPort);
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exit(1);
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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("We couldn't get the comm state\n");
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exit(1);
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}
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//
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// Set the baud to 19200 and the data bits to 8
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// (We want 8 so that we don't lose any of our data.)
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//
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MyDcb.fDtrControl = DTR_CONTROL_DISABLE;
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MyDcb.fRtsControl = DTR_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("We couldn't set the comm state\n");
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exit(1);
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}
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if (!EscapeCommFunction(
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hFile,
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CLRDTR
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)) {
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printf("We couldn't clear the dtr\n");
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exit(1);
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}
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if (!EscapeCommFunction(
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hFile,
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CLRRTS
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)) {
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printf("We couldn't clear the rts\n");
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exit(1);
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}
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if (!DeviceIoControl(
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hFile,
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IOCTL_SERIAL_GET_DTRRTS,
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NULL,
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0,
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&mask,
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sizeof(mask),
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&retSize,
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NULL
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)) {
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printf("We couldn't call the iocontrol\n");
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exit(1);
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}
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if (mask & (SERIAL_DTR_STATE | SERIAL_RTS_STATE)) {
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printf("One of the bits is still set: %x\n",mask);
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exit(1);
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}
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if (!EscapeCommFunction(
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hFile,
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SETRTS
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)) {
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printf("We couldn't set the rts\n");
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exit(1);
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}
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if (!DeviceIoControl(
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hFile,
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IOCTL_SERIAL_GET_DTRRTS,
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NULL,
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0,
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&mask,
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sizeof(mask),
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&retSize,
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NULL
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)) {
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printf("We couldn't call the iocontrol\n");
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exit(1);
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}
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if (!(mask & SERIAL_RTS_STATE)) {
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printf("rts is not set: %x\n",mask);
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exit(1);
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}
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if (!EscapeCommFunction(
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hFile,
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SETDTR
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)) {
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printf("We couldn't set the DTR\n");
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exit(1);
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}
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if (!DeviceIoControl(
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hFile,
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IOCTL_SERIAL_GET_DTRRTS,
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NULL,
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0,
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&mask,
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sizeof(mask),
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&retSize,
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NULL
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)) {
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printf("We couldn't call the iocontrol\n");
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exit(1);
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}
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if (!(mask & SERIAL_DTR_STATE)) {
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printf("dtr is not set: %x\n",mask);
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exit(1);
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}
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}
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