Fix register clobbers in read_flash asm #14
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I was seeing crashes shortly after calling `flash_unique_id`, and found that the asm code uses r5 and r7 without declaring them as clobbered. (r7 is likely not a practical issue because as the frame pointer, the function prologue always saves it, but just to be safe I added a push/pop because it can't be marked as a regular clobber)
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I was seeing crashes shortly after calling
flash_unique_id, and found that the asm code uses r5 and r7 without declaring them as clobbered.(r7 is likely not a practical issue because as the frame pointer, the function prologue always saves it, but just to be safe I added a push/pop because it can't be marked as a regular clobber)