[avr-chat] Trouble getting serial link with BlueSMiRF BT radio (used to work)

[Rick Mann]

I have a mega128-based board that uses USART0 to connect to a  
SparkFun BlueSMiRF radio. The BlueSMiRF effectively gives me a  
wireless serial connection; a serial port appears on my Mac, and I  
have ZTerm (or a custom Java app) connect to the serial port.

This has been working really well, up until recently. Now, if I  
attempt to connect, both programs report an error saying that the  
port is in use (by another app). I've disabled all serial-port  
related code in my firmware, and have narrowed the problem down to  
this: if I initialize USART0, my apps can't connect (the BlueTooth  
connection is made, but the subsequent serial link never  
establishes). If I do NOT initialize USART0, the connection is  
established just fine, and I can send AT commands to the BlueSMiRF.

FWIW, I've included my initialization code below. inCPUOsc is 16e6,  
inBaud is 76800.

void
USART0Init(UInt32 inCPUOsc, UInt32 inBaud)
{
        UInt32  baudConfig = (inCPUOsc / (inBaud * 16L)) - 1;
        
        UBRR0H = (uint8_t) (baudConfig >> 8);
        UBRR0L = (uint8_t) (baudConfig);

        // Enable receiver and transmitter; enable RX interrupt
	//			RX int enable	TX int disable	dtareg intdis	RX enable		TX  
enable		8-bit chars	
        //                              1                               0       
                        0                               1                       
        1                               0
        
	UCSR0B = 	(1 << RXCIE0) |	(0 << TXCIE0) |	(0 << UDRIE0) |	(1 <<  
RXEN0) |	(1 << TXEN0) |	(0 << UCSZ02);

	//			asynchronous		---  no parity ---			1 stop bit			--- 8-bit chars  
---			unused, write 0
        //                              0                               0       
                        0                               0                       
        1                               1                               0
        
	UCSR0C =	(0 << UMSEL0) |	(0 << UPM01) |	(0 << UPM00) |	(0 << USBS0)  
|	(1 << UCSZ01) |	(1 << UCSZ00) |	(0 << UCPOL0);
        
        //      Initialize the buffers…
        
        sSBReadPos = NULL;
        sSBWritePos = sSendBuffer;
        sSBAvailableWriteBytes = kSendBufferSize;
        sSBAvailableReadBytes = 0;
}

Any ideas?

TIA,

--
Rick