Fix isochonous IN endpoint transfers #52
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For IN endpoint transfers, it's required to set EVEN/ODD frames correctly. Otherwise 50% of the frames do not get delivered.
Add back a cortex-m feature, as usb-device depends on it
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Note this is still the root cause of kiffie/usbd-audio#4 A patch was landed in a fork esp-rs-compat#1 but not here |
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For IN endpoint transfers, it's required to set EVEN/ODD frames
correctly. Otherwise 50% of the frames do not get delivered.
This is not well documented in STM manual ( RM0402 ) but is clearly present in stm32f4xx-hal-driver.
See USB_OTG_DIEPCTL_SODDFRM/USB_OTG_DIEPCTL_SD0PID_SEVNFRM in https://github.com/STMicroelectronics/stm32f4xx-hal-driver/blob/v1.8.4/Src/stm32f4xx_ll_usb.c