GPIF problem with EZ_USB FX2

I am using EP8FIFO to write data to an external device via GPIF.

I initialize as so:

EP8FIFOCFG=0x01; // AutoIn/AutoOut Disabled, WORDWWIDE=1 0x01); SYNCDELAY; EP8CFG = 0xA2; // Set EP8 to Bulk OUT 512 byte double buffered SYNCDELAY;

I write the data as so:

while(!(GPIFTRIG&GPIF_Done_bit)) ;

for(i = 0; i < len; i++) { SYNCDELAY; EP8FIFOBUF[i] = p[i + 1]; i++; SYNCDELAY; EP8FIFOBUF[i] = p[i - 1]; }

SYNCDELAY; EP8BCH = 0; SYNCDELAY; EP8BCL = len;

SYNCDELAY; GPIFTCB1 = 0; SYNCDELAY; GPIFTCB0 = len/2; SYNCDELAY;

GPIFTRIG = GPIF_EP8; // Start write on EP8 SYNCDELAY; while(!(GPIFTRIG&GPIF_Done_bit)) ;

This will run two times, but hangs on the third attempt.

If I add the following initialization code:

EP8BCH = 0x80; // arm EP8OUT by writing byte count w/skip. EP8BCL = 0x80; // arm EP8OUT by writing byte count w/skip. SYNCDELAY; EP8BCH = 0x80; // arm EP8OUT by writing byte count w/skip. EP8BCL = 0x80; SYNCDELAY;

OUTPKTEND = 0x08; // arm first buffer by writing OUTPKTEND w/skip=1 SYNCDELAY; OUTPKTEND = 0x08; // arm second buffer by writing OUTPKTEND w/skip=1 SYNCDELAY;

It never hangs, but the data (FD0:FD15) is not correct.

Thanks for your help.