Hi all,
I am trying to write to use the multiple serial interface on the 68HC12 but am can't get it to talk. I think I've isolated the problem to not being able to write to the SC1DRL register (SCI Data Register Low).
The following is an excerpt from my SCI ISR:
else if (HWRegPtr->SCI.sc1sr1.bit.tdre) { /* Transmit the next byte in TX_Buffer. */ if (TX_Buffer.in != TX_Buffer.out || TX_Buffer.full) { HWRegPtr->SCI.sc1drl.byte = TX_Buffer.buffer[TX_Buffer.out]; TX_Buffer.out++; if (TX_Buffer.out >= SCI_Buffer_Size) { TX_Buffer.out = 0; } TX_Buffer.full = 0; } /* Disable the transmit interrupt if the buffer is empty. */ if (TX_Buffer.in == TX_Buffer.out && !TX_Buffer.full) { Disable_SCI_TX(); }}
TX_Buffer.buffer has the right thing at index TX_Buffer.out when its contents are being written to HWRegPtr->SCI.sc1drl.byte, but my debugger doesn't show a change, and no data is being transmitted over the serial interface.
Anybody know what I'm missing?
