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ST STM32F423 Reference Manual page 1250

Advanced arm-based 32-bit mcus
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USB on-the-go full-speed (OTG_FS)
initializing the channel for the next transfer, if any). If PKTCNT bit in OTG_HCTSIZ2 =
0, reinitialize the channel for the next transfer. This time, the application must reset the
ODDFRM bit in OTG_HCCHAR2.
1250/1324
RM0430 Rev 8
RM0430

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