USB - assigning custom endpoints

RE: USB - assigning custom endpoints

Gabriele — Tue, 02 Aug 2022 05:59:44 GMT

Really device and host communicate over my desk. My conclusion is that the initial requirement of constrained endpoint numbering was unfounded.

RE: USB - assigning custom endpoints

Kenneth — Wed, 27 Jul 2022 14:40:59 GMT

You are right, it looks like usb_validate_ep_cfg_data() in usb_fix_descriptor() from usb_descriptor.c does ensure ep_addr are sequentially mapped. So I guess you will need to edit that implementation in usb_validate_ep_cfg_data() if you want to override this in some way.

Kenneth

RE: USB - assigning custom endpoints

Gabriele — Tue, 26 Jul 2022 14:49:09 GMT

It doesn't work .I already checked it out.
If I set

#define LOOPBACK_OUT_EP_ADDR 0x03
#define LOOPBACK_IN_EP_ADDR 0x84

I always get
$ lsusb -d 1211:000B -v
Endpoint Descriptor:
..
bEndpointAddress 0x81 EP 1 IN
..
bEndpointAddress 0x01 EP 1 OUT

Gabriele

RE: USB - assigning custom endpoints

Kenneth — Tue, 26 Jul 2022 13:31:51 GMT

I did a quick search for ep_addr, and could find that most USB class drivers seems to have defines for this, I don't see any reason why you can't change them. Also see: https://docs.zephyrproject.org/latest/services/usb/uds.html

Kenneth