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
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