On 3/24/07, Thibaud Hottelier <[EMAIL PROTECTED]> wrote:
I updated the wiki paged and added state machines. (http://gnuradio.org/trac/wiki/UsrpTxModifications)
A comment with the USB Block - I believe all the processing going into the USB FIFO is done within the FX2. Moreover, i don't know why you're keeping the byte_count around - it's coming in with the packet header.
Here are the issues still unresolved that I am aware of: - Are the overrun/underrun flag per channel or global? From which fifo should they be generated?
Each channel should be responsibile for returning each individual status back up to the host. With that given, I believe the messages should be sent up and identified as stating "TX Channel 0" or "RX Channel 1" is having over or under runs. That would be helpful, correct?
- When a packet is outdated I still have to walk though it to empty to skip it. This can be resolved by using a RAM block rather than a fifo for the N chanX_fifo be will require more coordination between the USB block and the data block.
Being able to skip over an entire packet if the over or underrun happens, is extremely helpful and should be implemented. We can have a modified FIFO possibly with a way to "skip" a specific number of packets? That would be interesting and easily implementable within your state machines.
- Now I am assuming that the samples are 16bits interleaved, how will the sample format chosen by the user be reported to the FPGA?
There is a command that is sent down to the FPGA and can be set in a mux. The "format" should be passed into the processing FSM and handled there. It's a good question - no real idea right now how to handle this.
Thibaud
Good job so far. It's probably just me, but those FSMs just seem a little busy and a little confusing. I'll figure them out soon enough. Brian _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
