Hi,
Apologies for the delay in my response.
Please find my comments below:
1) In fifo_reset(), 0x82, 0x84, 0x86, 0x88 should be used instead of 0x02, 0x04, 0x06 and 0x08.
2) EPxFIFOCFG=0x00 (AUTOOUT=0)
SYNCDELAY
EPxFIFOCFG=0x11 ( AUTOOUT=1)
The core needs to see AUTOOUT=0 to AUTOOUT=1 switch to arm the endpoints. Also, only OUT endpoints need to be armed.
However, in your code snippet, you are arming EP6 which is an IN endpoint that is not appropriate.
Additionally, you are not initializing EP2 in AUTO mode.
Lastly, since you are using FIFOINPOLAR, the polarity of the flags is reversed which by default are active low. So FLAG B signal is now an active-high signal. Thus, when empty during the start, it will be high. If you omit FIFOINPOLAR, the FLAG signals will be active-low by default.
Regards,
Mallika
