Hi Group,
I'm trying to send data through a usb in endpoint to a host pc using a linked list. I've been
through spru511 backwards and forwards, and have also looked at the csl source, and I'm still
not clear on a couple of points. It would save me a lot of experimentation if someone knew the
answers. Specifically:
1. There appear to be three places I can put the byte count - as a postTransaction parameter,
as the first word in the USB_DataStruct, or as the first word in my data buffer. Do I put the
same value in all three places?
2. The data buffer pointer in USB_DataStruct - does it point to the first word (containing the
byte count) or to the first word containing data?
Thanks, Don

Don,

1. Byte count has to be in the postTransaction parameter. It's not 
necessary to put the count as the first word of datastruct -- you 
just leave a word space there and postTransaction will overwrite the 
word with byte count.

2. It points to the byte count.

Good luck

Wei

--- In c...@yahoogroups.com, donald@... wrote:
>
> Hi Group,
> I'm trying to send data through a usb in endpoint to a host pc 
using a linked list. I've been through spru511 backwards and 
forwards, and have also looked at the csl source, and I'm still not 
clear on a couple of points. It would save me a lot of 
experimentation if someone knew the answers. Specifically:
> 1. There appear to be three places I can put the byte count - as a 
postTransaction parameter, as the first word in the USB_DataStruct, 
or as the first word in my data buffer. Do I put the same value in 
all three places?
> 2. The data buffer pointer in USB_DataStruct - does it point to the 
first word (containing the byte count) or to the first word 
containing data?
> Thanks, Don
>