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OTG full speed support on ISP1507

James Li
Intellectual 750 points

Hello friends,

Have you guys ever tried to configure full speed on OTG ISP1507?

I built CE7 image with USB Serial Client selected in Catalog and with "DisableHighSpeed"=dword:1 in Registry. The board is Mistral REV G.

When I connected activesync cable to the PC, the PC detected that EVM is full speed and connected to it using activesync. I noticed that when I was copying a big file say around 6MB, it was very slow. I put a USB sniffer to capture the packets and I found that there were many NAKs sent to the PC when EVM received "OUT" token. I also found in the driver that whenever ReadFiFo function is called in pdd.c, RXCSR_P_FIFOFULL bit is always set in csrVal even though RxCount in the csrVal is less than 64. The FIFO size is set to 512 bytes.

I believe that the NAK sent to the PC is because of RXCSR_P_FIFOFULL of being set to 1.

Does anyone have a clue?

Thanks in advance,

James