On Thu, 16 Jan 2003, thomas chen wrote:
|
| i am not sure if i understand the PID stuff correctly after reading
| thru the code and some USB spec
|
| i thought from my limited reading that
| OUT - Function to HOST
| IN - HOST to Function
OUT: host to device
IN: device to host
It's basically PC-centric. (PC = host)
like you say:v
| so... if that is the case... from PC/host point of view... we SHOULD
| never send out any packet that is has OUT bit set???? why am i seeing
| BULK message being queued up with that bit set ???
|
| 0x80000280
| ^
|
| this starts happening when the usbserial being opened...
|
| the driver... (SL811) from my reading that look at the PID and decide
| not to copy the data into the chip's memory area.....
|
| so
| 1. why is the host protocol stack generating packets with OUT bit???
| is this wrong???
Nope.
| should that bit not be set???
Nope.
| 2. or... the driver should ingnore that bit and push the data out
| regardless?
HTH.
--
~Randy
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