jackcartersmith/blackmagic
1
0
Fork 0
Code Issues Pull Requests Releases Activity

usbd: document that only 8 eps are allowed.

Browse Source 
The internal stack has a hard internal limit of 8, which is as many as
all supported devices support, but not as flexible as the arbitrary
addressing that USB actually allows.

At _least_ document this.

Fixes: https://github.com/libopencm3/libopencm3/issues/666
This commit is contained in:
Karl Palsson 2019-06-05 21:48:28 +00:00
parent 1e3741cb20
commit 795fe21860
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/libopencm3/usb/usbd.h
View File

@ -172,6 +172,9 @@ extern void usbd_disconnect(usbd_device *usbd_dev, bool disconnected);
/** Setup an endpoint
* @param addr Full EP address including direction (e.g. 0x01 or 0x81)
* @param type Value for bmAttributes (USB_ENDPOINT_ATTR_*)
* @note The stack only supports 8 endpoints, 0..7, so don't try
* and use arbitrary addresses here, even though USB itself would allow this.
* Not all backends support arbitrary addressing anyway.
*/
extern void usbd_ep_setup(usbd_device *usbd_dev, uint8_t addr, uint8_t type,
uint16_t max_size, usbd_endpoint_callback callback);