Hi,
I took my ReadSerial() and dumped the code directly inot the
frmOpenEvent on the Monitoring Frm. The code is below, along with the
OpenSerial() code.
I added EvtGetEvent(&event, 0) to my code to get a penDown
event. The penDown event only works when I REM out the SerReceive
functions.. Obviously, there is something else going on here.
My overall goal here is to read from a serial transmitter (whichs
sends the data via radio}, get the data, save the data and plot in
realtime. A custom receiver was made to receive the data.
The data being sent out is a StartCharacter, the Data(3 characters)
and then a checksum(sum of the Data(3 characters)). What I want to do
is look for the ASCII Char 165 as the StartChar and then read, save
and plot the next 3 Data Characters. Then when the StartChar is read
again, save and plot the next 3 Data Characters and so on. Sounds
straight forward.
What happens right now is that when I go into Monitoring mode to
receive the data, the palm device basically seams to lock until I
turn off the transmitter. It is obviously receiving data and no
errors are occuring (unless I turn of the transmitter).
Your help would be greatly appreciated.
Thanks,
Darrin
char szBuf[1024];
static int index = 0;
int i, iA, iX;
Err error;
ULong ulBytes, ulPendingBytes, ulStartTime, ulEndTime;
CharPtr sA, cStatus, sBytes, sBuffer, sBufferGreater;
CharPtr sX, ;
ULong ulStartTick, ulLastTick, ulReceive;
EventType event;
long timeout;
SWord prevX, prevY;
Boolean penDown, Done;
ulLastTick = TimGetTicks();
ulStartTick = ulLastTick;
OpenSerial();
iA = 0;
fBreak = false;
if (Connected == 0) return; // Connected set to 1 in OpenSerial()
// if successful
timeout = SysTicksPerSecond() / 2;
error = SerReceiveWait(gSerialRefNum, sizeof(gSerialBuffer), timeout);
if (error == serErrTimeOut)
{
FrmAlert(InterbyteTimeoutAlert);
SerReceiveFlush(gSerialRefNum,100);
}
if (error == serErrLineErr)
{
FrmAlert(RS232LineErrorAlert);
SerReceiveFlush(gSerialRefNum,100);
}
ulStartTime = TimGetTicks();
do
{
SerReceiveCheck(gSerialRefNum, &ulPendingBytes);
if(ulPendingBytes)
{
//Draw buffer count to screen to confirm that there
//is something in the buffer
sBuffer = "Buffer";
StrIToA(sBytes, (int)ulBytes);
WinDrawChars(sBuffer, StrLen(sBuffer), 25, 20);
WinDrawChars(sBytes, StrLen(sBytes), 55, 20);
Done = true;
}
ulEndTime = TimGetTicks();
}while ((Done == false) && ((ulEndTime-ulStartTime) <= timeout));
ulStartTime = TimGetTicks();
do
{
EvtGetEvent(&event, 0); // Get current event
if (event.eType == penDownEvent)
{
EvtGetPen( &prevX, &prevY, &penDown);
//Get pen position
if (prevY<130)
{
DrawFlags();
}
else
{
fBreak = true;
}
}
if (fBreak) break;
ulBytes = SerReceive(gSerialRefNum,&gSerialBuffer,
1,0,&error);
if (error == serErrLineErr)
{
FrmAlert(RS232LineErrorAlert);
SerReceiveFlush(gSerialRefNum,100);
}
if(ulBytes)
{
//Draw the character to the screen
sX = gSerialBuffer;
WinDrawChars(sX, StrLen(sX), 25, 50);
}
else
{
ulEndTime = TimGetTicks();
}
}while((ulEndTime - ulStartTime) <= timeout);
CloseSerial();
PortOpen = false;
// FrmGotoForm(DisplayForm);
handled = true;
}
return(handled);
}
void OpenSerial(void)
{
Err error;
SerSettingsType sstSetup;
error = SysLibFind("Serial Library", &gSerialRefNum);
ErrNonFatalDisplayIf(error != 0, "Can't find serial library");
error = SerOpen(gSerialRefNum, 0, glBaudRate);
if (error != 0)
{
if (error == serErrAlreadyOpen)
{
FrmAlert(SerialInUseAlert);
SerClose(gSerialRefNum);
}
else
{
FrmAlert(CanNotOpenSerialAlert);
}
}
Connected = 1;
error = SerSetReceiveBuffer(gSerialRefNum, gSerialBuffer,
sizeof(gSerialBuffer));
SerGetSettings(gSerialRefNum, &sstSetup);
sstSetup.baudRate = 4800;
sstSetup.flags = serSettingsFlagBitsPerChar8 |
serSettingsFlagStopBitsM |
serSettingsFlagStopBits1;
sstSetup.ctsTimeout = 0;
// Ask Serial Manager to update the port settings
error = SerSetSettings( gSerialRefNum, &sstSetup );
if ( error ) SerClose( gSerialRefNum );
SerReceiveFlush(gSerialRefNum, 100);
}
On Wed, 8 Nov 2000 13:47:00 -0500, "Dave Lippincott" <[EMAIL PROTECTED]>
wrote:
>
>Is your ReadSerial routine allowing OS messages to be processed?
>
>----- Original Message -----
>From: "Deveau, Darrin" <[EMAIL PROTECTED]>
>To: "Palm Developer Forum" <[email protected]>
>Sent: Wednesday, November 08, 2000 8:50 AM
>Subject: Serial question
>
>
>> Hi,
>>
>> I am working on an application which receives data through the serial
>port.
>>
>> I want to be able to stop transmission by tapping the screen.
>>
>> The following is a code snippet from the form which I load to begin
>> receiveing the serial data.
>>
>> switch (event->eType)
>> {
>> case frmOpenEvent:
>>
>> OpenSerial();
>> Read Serial();
>> etc...
>>
>> Case ctLSelectEvent
>>
>> etc.....
>>
>> I added the following to the Read Serial
>>
>> if(event->eType == penDownEvent)
>> {
>> if (event->screenY<80)
>> {
>> DrawFlags();
>> }
>> else
>> {
>> break;
>> }
>> }
>>
>> The break or DrawFlags() will not happen unless I actually turn off the
>> transmitter to terminate communication upon which I receive an error as
>> expected.
>>
>> Any Suggestions.
>>
>> Thanks,
>> Darrin
>>
>>
>> --
>> For information on using the Palm Developer Forums, or to unsubscribe,
>please see http://www.palmos.com/dev/tech/support/forums/
>>
>>
>
>
>
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