Automatically count EXTERNAL_FLASH_DEVICES #4358
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Instead of counting words in make, which is slightly awful, notice that possible_devices is local to external_flash.c, so we can declare the array with an automatic bound, and then get the count as the element-count (MP_ARRAY_SIZE) of the array. Since EXTERNAL_FLASH_DEVICE_COUNT is no longer a global macro, switch a few sites to using EXTERNAL_FLASH_DEVICES in `#if` checks instead.
dhalbert
approved these changes
Mar 7, 2021
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I compile-tested this with some single-device and some multi-device configurations, both
A,B,Cand `"A, B, C" styles and the calculated number matched the original number in each case.