T3 serial communication problems

[Kraig Ritmanich]

Hello,

I'm having problems sending data via RS232 with my Tungsten T3 running OS 
5.2.1.  The strange thing is that I have a Zire 71 and Tungsten T2, both 
with OS 5.2.1, as well as several OS 4.x devices and the code works fine on 
all of these.  I've performed a serial (RS232) HotSync with the T3, so it 
doesn't appear to be a bad serial port.  Here's what I'm seeing on the T3 
(see code below):

1) serPortInit() executes without any errors
2) message is built in code that's not shown without errors
3) serMsgTransmit() executes (no errors), but data does not appear on the 
line
4) another message is built
5) serMsgTansmit() starts execution, but T3 locks up and hangs after it 
reaches SrmSendFlush()
6) need to Soft Reset the T3 to get it out of the lock-up

Any help would be much appreciated!

Thanks!
Kraig
Global Variables:
SerSettingsType   m_serSettings;
UInt              m_serRefNum;
Boolean serPortInit(Boolean sendSoundCmd)
{
 Err               error;
 UInt              tempInt;
 // Initialize the Settings Vars
 m_serSettings.baudRate = 9600;
 m_serSettings.ctsTimeout = 1;
 m_serSettings.flags = (srmSettingsFlagBitsPerChar8 | 
srmSettingsFlagStopBits1 | srmSettingsFlagRTSAutoM);

 // Initialize the Serial Manager
 error = SrmOpen(serPortCradleRS232Port, m_serSettings.baudRate, 
&m_serRefNum);
 if(error)
 {
   SrmClearErr(m_serRefNum);
   FrmAlert(SysErrSerCantOpenAlert);
   return true;
 }
 // initialize the serial port baud rate
 tempInt = sizeof(m_serSettings.baudRate);
 error = SrmControl(m_serRefNum, srmCtlSetBaudRate, 
&m_serSettings.baudRate, &tempInt);
 if(error)
 {
   SrmClearErr(m_serRefNum);
   FrmAlert(SysErrSerValuesAlert);
   return true;
 }
 // initialize the serial port settings
 tempInt = sizeof(m_serSettings.flags);
 error = SrmControl(m_serRefNum, srmCtlSetFlags, &m_serSettings.flags, 
&tempInt);
 if(error)
 {
   SrmClearErr(m_serRefNum);
   FrmAlert(SysErrSerValuesAlert);
   return true;
 }
 // initialize the serial port cts timeout
 tempInt = sizeof(m_serSettings.ctsTimeout);
 error = SrmControl(m_serRefNum, srmCtlSetCtsTimeout, 
&m_serSettings.ctsTimeout, &tempInt);
 if(error)
 {
   SrmClearErr(m_serRefNum);
   FrmAlert(SysErrSerValuesAlert);
   return true;
 }

 // clear any pending serial errors
 SrmClearErr(m_serRefNum);
 // Initialize serial buffer handle
 m_serRxBufferHandle = MemHandleNew(SER_BUFF_SIZE);
 // Lock down the handle and get pointers to the memory chunk.
 m_serRxBuffer = (CharPtr)MemHandleLock(m_serRxBufferHandle);
 // Clear UART buffer
 StrCopy(m_serRxBufferHandle, "");
 return false;
}
Boolean serMsgTransmit(CharPtr txBuffer, UInt occ)
{
 Err       status = 0;
 Boolean   errorStatus = false;
 // Flush Tx and Rx buffer
 SrmReceiveFlush(m_serRefNum, 0);
 SrmSendFlush(m_serRefNum);
 // Send data to port
 SrmSend(m_serRefNum, txBuffer, occ, &error);
 if(error)
   status = true;  // Error occured
 return status;
}
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