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arm/stm32: Route EP0 completions to the EP0 handler on M0 parts.

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The correct transfer loop in stm32_usb_interrupt() dispatched every
completion to stm32_epdone(), including those for endpoint 0.

stm32_epdone() implements the generic bulk/interrupt endpoint completion
path.  It does not decode the SETUP stage, does not maintain the EP0
state machine, and does not apply the EP0 specific RX/TX status rules.
Control transfers therefore never completed correctly and the device
could not be enumerated.

Dispatch endpoint 0 to stm32_ep0done(), which is the control endpoint
handler and is already used for the same purpose by the low priority
transfer path in stm32_lptransfer().

Assisted-by: GitHub Copilot:claude-opus-5
Signed-off-by: jsanchez-2g <jsanchez@2g-eng.com>
This commit is contained in:
jsanchez-2g 2026-08-18 16:12:18 -05:00 • committed by Xiang Xiao
parent a271b641a5
commit 432d21a116
1 changed files with 8 additions and 1 deletions
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9
arch/arm/src/common/stm32/stm32_usbdev_m0_v1.c
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@ -2390,7 +2390,14 @@ static int stm32_usb_interrupt(int irq, void *context, void *arg)
/* And handle the completion event */
stm32_epdone(priv, epno);
if (epno == EP0)
{
stm32_ep0done(priv, istr);
}
else
{
stm32_epdone(priv, epno);
}
/* Fetch the status again for the next time through the loop */