USBN9603: how to receive a zero length packet from the host?

[alexz]

USBN9603

I am developing a USB Mass Storage Device using the USBN9603 and PIC.

I have a question regarding the USBN9603.

What should I do exactly when I receive a zero length packet from the host?
Should I read again the status register or not?

I have a problem of the no available transmit buffer space.
TCOUNT in the TXS0 = 0 .
and the data is not probably transmitted
How can I solve it?

 

[checkmate]

Re: USBN9603

I am developing a USB Mass Storage Device using the USBN9603 and PIC.

I have a question regarding the USBN9603.

What should I do exactly when I receive a zero length packet from the host?
Should I read again the status register or not?

Yes, you should. The very fact that you asked this question is probably because you've seen something regarding it in the datasheet but are not sure about it. If you don't do so, the RX_LAST bit would not be cleared and the interrupt would be retriggered.

 

[alexz]

Re: USBN9603

I am developing a USB Mass Storage Device using the USBN9603 and PIC.

I have a question regarding the USBN9603.

What should I do exactly when I receive a zero length packet from the host?
Should I read again the status register or not?

Yes, you should. The very fact that you asked this question is probably because you've seen something regarding it in the datasheet but are not sure about it. If you don't do so, the RX_LAST bit would not be cleared and the interrupt would be retriggered.

so, if I receive a zero length packet and read the status again, I will probably get some setup data, do I have to process it as usual? Like I did not receive the zero length packet?

 

[scholar]

USBN9603

How can i interface with the PC?

Added after 35 seconds:

What language should i use?