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this
Signed-off-by: sakumisu <[email protected]>
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Report an error through USB_LOG_ERR when SystemCoreClock does not match
any supported 48/96/144/192/240 MHz divider case, instead of silently
leaving the USBFS prescaler unconfigured.
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- usb_glue_nation.c: match usb_dc_low_level_init/deinit to the (void)
weak stubs in usb_dc_fsdev.c and guard on g_usbdev_bus[0] (the old
(uint8_t busid) signature read garbage at the no-arg call site)
- usb_glue_nation.c: drop NVIC_PriorityGroupConfig from the driver hook;
it reprograms SCB->AIRCR for the whole system, priority grouping now
stays with board/application startup code
- usb_glue_nation.c: derive the USBFS prescaler from SystemCoreClock at
runtime instead of a per-part compile-time table (fixes N32H475
landing in the 240 MHz branch; adapts to any configured PLLCLK)
- add docstrings to the functions touched by this diff
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Add full-speed USB device (USBFS) support for the Nations N32H4x family
(N32H47x_48x and N32H49x), whose Synopsys USBFS core re-arranged the
register and bit-field layout of the STM32 version:
- usb_glue_nation.c: chip-level bring-up (48 MHz USB clock from PLL,
DM/DP GPIO with a weak overridable hook, NVIC USB_FS_LP_IRQn dispatch)
- usb_fsdev_reg.h: re-map USB_EPn/CNTR/ISTR/BTABLE/FN/DADDR register
layout and every affected bit macro for N32H4x (32-bit EP registers,
no BCDR; DP pull-up moved to CNTR.PU)
- usb_dc_fsdev.c: N32H4x power-on sequence (clear PD, wait, clear FRST)
and EP_ID position handling
- README: document the supported N32H4x parts
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