Re: [Fx2lib-devel] Sourcing slave FIFO packets

[Dennis M. <djm...@gm...>]

We sourced OUT packets to our FPGA.  Check out the UXN2030_firmware.
https://github.com/ubixum/UXN2030_firmware


On 02/27/2011 07:53 PM, Daniel O'Connor wrote:
>
> On 28/02/2011, at 24:49, Chris McClelland wrote:
>> Daniel, thanks for your reply. I wasn't clear. It's not the PC that should
>> be getting this data, it is the FPGA attached to the EP6 slave FIFO. Since
>> it's just a FIFO it has no notion of NAK. For example, in the code below I
>> have set AUTOOUT=0. Now whenever an EP6 packet arrives from the host,
>> fifo_send() is invoked which rewrites the packet to a dummy set of bytes. I
>> tested this and it works. So far so good. But, crucially, if I invoke
>> fifo_send() on some_other_condition() e.g a button press, the FPGA sees
>> nothing on the FIFO. Is it just not possible to manually prod the slave
>> FIFOs like this? Or am I missing something?
>
> Ahh hmm..
> I haven't used slave FIFO so I don't know :(
>
> I suspect you can't fake an out packet though so I think you may be out of luck..
>
> ie it's OK when you send to EP6 from the PC because everything is set up and so when you allow the packet through it works.
>
> AFAIK you can only generate IN packets (and sink OUT packets) using firmware, you can't generate an OUT packet.
>
> If you use GPIF you can manually trigger read&  write waveforms with data the micro chooses using XGPIFSGLDATL/XGPIFSGLDATH.
>
>>
>> // Called once at startup
>> //
>> void main_init(void) {
>>     FIFOPINPOLAR = 0x03;
>>     SYNCDELAY(); CPUCS = bmCLKSPD1;  // 48MHz
>>     SYNCDELAY(); IFCONFIG = (bmIFCLKSRC | bm3048MHZ | bmIFCLKOE |
>> bmSYNCFIFOS);
>>     SYNCDELAY(); REVCTL = (bmDYN_OUT | bmENH_PKT);
>>     SYNCDELAY(); EP6CFG = (bmVALID | bmBULK | bmDOUBLEBUFFERED);
>>     SYNCDELAY(); FIFORESET = bmNAKALL;
>>     SYNCDELAY(); FIFORESET = bmNAKALL | 6;  // Reset EP6
>>     SYNCDELAY(); FIFORESET = 0x00;
>>     SYNCDELAY(); EP6FIFOCFG = 0x00;
>>     SYNCDELAY(); OUTPKTEND = bmSKIP | 6;
>>     SYNCDELAY(); OUTPKTEND = bmSKIP | 6;
>>     sendCount = 0;
>> }
>>
>> // Compose a packet to send on the EP6 FIFO, and commit it.
>> //
>> void fifo_send(void) {
>>     EP6FIFOBUF[0] = 0x00;
>>     EP6FIFOBUF[1] = 0x01;
>>     EP6FIFOBUF[2] = 0x00;
>>     EP6FIFOBUF[3] = 0x00;
>>     EP6FIFOBUF[4] = 0x00;
>>     EP6FIFOBUF[5] = sendCount++;
>>     SYNCDELAY(); EP6BCH = 0;
>>     SYNCDELAY(); EP6BCL = 6;
>> }
>>
>> // Called repeatedly while the device is idle
>> //
>> void main_loop(void) {
>>     if ( !(EP2468STAT&  bmEP6EMPTY) ) {
>>         fifo_send();
>>     }
>>     if ( some_other_condition() ) {
>>         fifo_send();
>>     }
>> }
>>
>>
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>
> --
> Daniel O'Connor software and network engineer
> for Genesis Software - http://www.gsoft.com.au
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