Hi there,

Sorry if i'm missing something, I've been digging for a few hours now and can't see where the SlipMACDriver actually initiates a transmission.

In practice this presents as [ERR ][slip]: Ran out of TX Buffers. and there does not appear to be any slip packet output over serial (also the serial send method is never called, validated in the debugger).

The transmission process as far as I can see:

1. SlipMACDriver::slip_if_tx() is called to send a SLIP packet
   • copies the transmission data into one of the available buffers
   • binds txIrq() for the current instance (this is commented out with a TODO)
   • binds a callback for the current slip instance
2. SlipMACDriver::txIrq() gets called on the completion of the underlying serial tx
   • loads a buffer if there is not currently one set to pCurSlipTxBuffer
   • outputs one character
   • returns the buffer and clears pCurSlipTxBuffer once it is empty

So once a transmission has been started, provided the underlying serial interrupt is being called (which also appears to be a problem on my platform, par for the embedded course).
But in the first instance, or if there isn't a transmission already in flight it'll never begin another transmission?

My suggestion would be that txIrq() should be fired from the slip_if_tx() method after registering the callback, or alternately via a signal to the SLIP_IRQ_Thread, but I am unsure as to how this was intended to work.

Thanks for the help (again!),

Ryan