Hi Greg,
Thanks for your kind reminding. I never notice the footer if you
don't tell me...
I resend my mail by another mail account. Following is the original message.
I have encounter a problem while sending Serial_State packet of
CDC-ACM from Linux gadget to Linux host .
Here is my question:
The environment is a USB device which runs Linux is using
CDC-ACM(f_acm.c) to communicate with a Linux host(cdc-acm.c). When
device tries to send Serial_State packet to host, host always can't
get correct data. I look into the host driver(cdc-acm.c) and found
driver calls get_unaligned_le16 on data and this function inverts byte
order of data.
Following is the link of cdc-acm.c and f_acm.c
ACM host:
http://lxr.free-electrons.com/source/drivers/usb/class/cdc-acm.c#L325
ACM gadget:
http://lxr.free-electrons.com/source/drivers/usb/gadget/function/f_acm.c#L493
From the current code, gadget send Serial_State in big-endian but
host treat it as little-endian.
Is this a problem?
Appreciate for your time
Benson
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