fenugrec a7632df7f4 iwdg: START and UNLOCK values before polling Busy ...

With code that uses IWDG and these operations:

- user code initializes iwdg
- user code jumps to USB-DFU
- USB host triggers a USB exit (e.g. after reflashing, or even just a
  dummy dfu-util Reset/Exit command)
- user code will hang in iwdg_prescaler_busy() called from
  iwdg_set_period_ms()

2025-07-11 21:05:58 -07:00

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