Update mos_api.asm for non-blocking mos_ugetc #67
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Update mos_api.asm for non-blocking mos_ugetc for serial terminal via UART1
This is not backwards compatible, I was scratching my head for a use-case where blocking would be needed. Alternatively create an additional function mos_ugetch (with an "h")
Created for my serial terminal https://youtu.be/dYVpXgn82Fk?t=68