Finally got the problem solved, (sorry for the chaos.)
problem was i incorrectly used "libusb_control_transfer_get_data"
instead of transfer->buffer and that was contributing to the +8.
instead of sending the whole source (ie WIP, untested mostly), when i
wrote a new program (to share), it didnt showed the error, and finally
found the differential. :).
Thank You.
On 06/03/2014 12:08 AM, Tim Roberts wrote:
Kuldeep Singh Dhaka wrote:
Im facing a weird problem.
i have a ST uC (FS usb) that send data of ADC (12 bit) at 176Kilo
samples at bInterval=1; (2bytes for 1 sample)
ie 352byte isochronous endpoint requested every 1ms
when i request 1000 packets (each of 352 bytes), i received 8byte
garbage value (mostly 0x00) at the end of the 999th packet (assuming
packet index start from 0).
when i request 500 packets (each of 352 bytes), i received 8byte
garbage value (mostly 0x00) at the end of 499th packet.
when i request 100 packets (each of 352 bytes), i received 8byte
garbage value (mostly 0x00) at the end of 99th packet.
when i request 10 packets (each of 352 bytes) i received 8byte byte
garbage value (mostly 0x00 | non-zero on offset 1 byte of garbage
start) at the end of 9th packet. (non-zero garbage value position is
352 - 8 + 1).
Can you show us your code? It's difficult to imagine how anything
below your application could cause this.
--
Tim Roberts,t...@probo.com
Providenza & Boekelheide, Inc.
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*Kuldeep Singh Dhaka*
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Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and their
applications. Written by three acclaimed leaders in the field,
this first edition is now available. Download your free book today!
http://p.sf.net/sfu/NeoTech
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