// Disconnects port
void commDisconnect() { // disconnects with serial port if connected
HMENU hMenu;
// Check if we're connected
if (CONNECTED(TTYInfo)) {
// Menu
hMenu = GetMenu(ghWndMain); // get the menu handle
EnableMenuItem(hMenu, ID_FILE_CONNECT, MF_ENABLED); // enable the connect menu
EnableMenuItem(hMenu, ID_FILE_DISCONNECT, MF_GRAYED | MF_DISABLED); // disable the connect menu
EnableMenuItem(hMenu, ID_EDIT_SETTINGS, MF_ENABLED); // enable the TTY menu
// lower DTR
EscapeCommFunction(COMDEV(TTYInfo), CLRDTR);
// Purge reads/writes, and I/O buffer
PurgeComm(COMDEV(TTYInfo), PURGE_FLAGS);
CloseHandle(COMDEV(TTYInfo)); // release the handle
TTYInfo.fThreadDone = TRUE; // we want the thread to end
CONNECTED(TTYInfo) = FALSE; // we are now disconnected
}
}
int commSendChar(char c) {
DWORD numBytesWritten; // records number of character successfully written (not used, but necessary for WriteFile)
OVERLAPPED overlapped = {0}; // overlap for preventing simulatious access to serial port
if (!TTYInfo.fConnected) // make sure port is actually active
return FALSE; // not connected :(
//WriteFile(wMem->hComm, (LPBYTE)&wParam, 1, &wMem->numofBWriten, &overlaped
if (!WriteFile(COMDEV(TTYInfo), &c, 1, &numBytesWritten, &overlapped)) // write byte to port
return FALSE; // write failed :(
CloseHandle(overlapped.hEvent);
return TRUE; // done
}
/*-----------------------------------------------------------------------------*/
void InitTTYInfo() {
// Initialize general TTY info
COMDEV(TTYInfo) = NULL;
CONNECTED(TTYInfo) = FALSE;
PORT(TTYInfo) = '0'; // setting to 0 since we know nothing about
// the current COM port configuration
BAUDRATE(TTYInfo) = CBR_9600;
BYTESIZE(TTYInfo) = 8;
PARITY(TTYInfo) = NOPARITY;
STOPBITS(TTYInfo) = ONESTOPBIT;
InitFont();
ClearTTYContents();
}
// Connects to, sets up and configures (if virgin) port.
void commConnect() {
DCB dcb;
HMENU hMenu;
// Make sure we're not connected
if (!CONNECTED(TTYInfo)) {
// Menu
hMenu = GetMenu(ghWndMain); // get the menu handle
EnableMenuItem(hMenu, ID_FILE_CONNECT, MF_GRAYED | MF_DISABLED); // disable the connect menu
EnableMenuItem(hMenu, ID_FILE_DISCONNECT, MF_ENABLED); // enable the disconnect menu
EnableMenuItem(hMenu, ID_EDIT_SETTINGS, MF_GRAYED | MF_DISABLED); // disable the TTY menu
COMDEV(TTYInfo) = CreateFile(gszPort, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
FillMemory(&dcb, sizeof(dcb), 0);
dcb.BaudRate = BAUDRATE(TTYInfo); // set the baud rate
dcb.ByteSize = BYTESIZE(TTYInfo); // set the data bits
dcb.fParity = PARITY(TTYInfo); // set the parity
dcb.StopBits = STOPBITS(TTYInfo); // set the stop bits
SetCommState(COMDEV(TTYInfo), &dcb); // update the COM port configuration
CONNECTED(TTYInfo) = TRUE; // we are now connected (hopefully)
}
// Start reading thread
TTYInfo.hThread = CreateThread(
NULL, // security attributes
0, // inital thread stack size, in bytes
commReadThread, // address of thread function
ghWndTerm, // argument for new thread
0, // creation flags
&TTYInfo.hThread
); // address of returned thread ID
TTYInfo.fConnected = TRUE;
}
/*-----------------------------------------------------------------------------
FUNCTION: WriterGeneric(char *, DWORD)
PURPOSE: Handles sending all types of data
PARAMETER:
lpBuf - pointer to data buffer
dwToWrite - size of buffer
HISTORY: Date: Author: Comment:
10/27/95 AllenD Wrote it
-----------------------------------------------------------------------------*/
void WriterGeneric(char * lpBuf, DWORD dwToWrite)
{
OVERLAPPED osWrite = {0};
HANDLE hArray[2];
DWORD dwWritten;
DWORD dwRes;
//
// If no writing is allowed, then just return
//
if (NOWRITING(TTYInfo))
return ;
//
// create this writes overlapped structure hEvent
//
osWrite.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (osWrite.hEvent == NULL)
ErrorInComm("CreateEvent (overlapped write hEvent)");
hArray[0] = osWrite.hEvent;
hArray[1] = ghThreadExitEvent;
//
// issue write
//
if (!WriteFile(COMDEV(TTYInfo), lpBuf, dwToWrite, &dwWritten, &osWrite)) {
if (GetLastError() == ERROR_IO_PENDING) {
//
// write is delayed
//
dwRes = WaitForMultipleObjects(2, hArray, FALSE, INFINITE);
switch(dwRes)
{
//
// write event set
//
case WAIT_OBJECT_0:
SetLastError(ERROR_SUCCESS);
if (!GetOverlappedResult(COMDEV(TTYInfo), &osWrite, &dwWritten, FALSE)) {
if (GetLastError() == ERROR_OPERATION_ABORTED)
UpdateStatus("Write aborted\r\n");
else
ErrorInComm("GetOverlappedResult(in Writer)");
}
if (dwWritten != dwToWrite) {
if ((GetLastError() == ERROR_SUCCESS) && SHOWTIMEOUTS(TTYInfo))
UpdateStatus("Write timed out. (overlapped)\r\n");
else
ErrorReporter("Error writing data to port (overlapped)");
}
break;
//
// thread exit event set
//
case WAIT_OBJECT_0 + 1:
break;
//
// wait timed out
//
case WAIT_TIMEOUT:
UpdateStatus("Wait Timeout in WriterGeneric.\r\n");
break;
case WAIT_FAILED:
default: ErrorInComm("WaitForMultipleObjects (WriterGeneric)");
break;
}
}
else
//
// writefile failed, but it isn't delayed
//
ErrorInComm("WriteFile (in Writer)");
}
else {
//
// writefile returned immediately
//
if (dwWritten != dwToWrite)
UpdateStatus("Write timed out. (immediate)\r\n");
}
CloseHandle(osWrite.hEvent);
return;
}
