no-serial SPI flash erase for Express boards #1
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This adds
examples/flash_erase_express, a version of flash_erase that can be loaded as a .uf2 and does not require the serial port or prompting. It's meant to be an easy way to clear a corrupted CircuitPython filesystem. The on-board NeoPixel is used to indicate progress, completion, and errors. @tannewt and I discussed providing this, maybe described in a pinned post in the CircuitPython forum section.Tested on Feather M0 Express, Metro M0 Express, and Circuit Playground Express rev B (I don't have the latest one yet).