Commit 44f86dd6 authored May 21, 2024 by Aurelien Jarno Committed by Anas Nashif May 24, 2024

usb: dfu: fix detach happening too fast



In some relatively rare conditions, the DFU detach/attach happens to
fast, which cause the host to not notice it. It seems to to be the case
for instance on STM32 when no endpoint are being used.

Adding a 1 ms delay (i.e. one SOF period) between the detach and the
attach fixes the issue.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

parent b34e94f3

subsys/usb/device/class/dfu/usb_dfu.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -427,6 +427,10 @@ static void dfu_timer_work_handler(struct k_work *item)
		LOG_ERR("usb_dc_detach failed");
		}
		dfu_enter_idle();

		/* Wait 1 SOF period to ensure the host notices the deconnection. */
		k_sleep(K_MSEC(1));

		if (usb_dc_attach()) {
		LOG_ERR("usb_dc_attach failed");
		}

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