Add in_waiting property to busio.UART - #1104
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makermelissa merged 1 commit intoApr 15, 2026
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Add the in_waiting property to match CircuitPython's busio.UART API. Returns the number of bytes available in the input buffer. - RP2040 UART: wraps MicroPython's uart.any() - busio.UART wrapper: checks for in_waiting first, falls back to any(), raises NotImplementedError if neither is available Fixes adafruit#1046
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When I tested it, return self._uart.any() wouldn't work on the GPS Lib result = self._uart.any()
return result if result == 0 else int(result / 8)However not sure if the magic 8 is RPi Pico specific |
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Summary
Adds the
in_waitingproperty tobusio.UARTto match CircuitPython's API. Returns the number of bytes available in the input buffer.This is needed by libraries like Adafruit_CircuitPython_GPS that rely on
in_waitingto check for available data before reading.Changes
src/busio.pyin_waitingproperty with fallback chain: customin_waiting→ MicroPythonany()→NotImplementedErrorsrc/adafruit_blinka/microcontroller/rp2040/uart.pyin_waitingproperty wrapping MicroPython'suart.any()How it works
in_waitingproperty on the underlying UART implementationuart.any()which is MicroPython's equivalentNotImplementedErrorwith a clear messageFixes #1046