[riot-notifications] [RIOT-OS/RIOT] Blocking mode for USBUS CDC ACM STDIO (see #16500) (#16508)
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Fri May 28 11:43:40 CEST 2021
### Contribution description
I've modified USBUS CDC ACM STDIO to support blocking on pending characters from USB. The behaviour is controlled by CONFIG_USBUS_CDC_ACM_STDIO_BLOCKING variable, and can be configured via Kconfig.
### Testing procedure
I have tested it against my own [PoC](https://github.com/ant9000/test_usb_uart). With the default RIOT config, characters from USB are lost as soon as the STDIO buffer (defined by CONFIG_USBUS_CDC_ACM_STDIO_BUF_SIZE) is overrun.
If I enable the new blocking mode, the sender application slows down and adapts to the receiver speed.
### Issues/PRs references
This PR implements feature #16500 .
You can view, comment on, or merge this pull request online at:
-- Commit Summary --
* Blocking mode for USBUS CDC ACM STDIO (see #16500)
-- File Changes --
M sys/usb/usbus/cdc/acm/Kconfig (6)
M sys/usb/usbus/cdc/acm/cdc_acm_stdio.c (29)
-- Patch Links --
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