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circuitpython/tests/circuitpython-manual/busio/uart_echo.py

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A few minor fixes for corner cases * Always clear the peripheral interrupt so we don't hang when full * Store the ringbuf in the object so it gets collected when we're alive * Make UART objects have a finaliser so they are deinit when their memory is freed * Copy bytes into the ringbuf from the FIFO after we read to ensure the interrupt is enabled ASAP * Copy bytes into the ringbuf from the FIFO before measuring our rx available because the interrupt is based on a threshold (not > 0). For example, a single byte won't trigger an interrupt.
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import busio
import board
import time
i = 0
u = busio.UART(tx=board.TX, rx=board.RX)
while True:
u.write(str(i).encode("utf-8"))
time.sleep(0.1)
run code formatting script
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print(i, u.in_waiting) # should be the number of digits
A few minor fixes for corner cases * Always clear the peripheral interrupt so we don't hang when full * Store the ringbuf in the object so it gets collected when we're alive * Make UART objects have a finaliser so they are deinit when their memory is freed * Copy bytes into the ringbuf from the FIFO after we read to ensure the interrupt is enabled ASAP * Copy bytes into the ringbuf from the FIFO before measuring our rx available because the interrupt is based on a threshold (not > 0). For example, a single byte won't trigger an interrupt.
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time.sleep(0.1)
run code formatting script
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print(i, u.in_waiting) # should be the number of digits
A few minor fixes for corner cases * Always clear the peripheral interrupt so we don't hang when full * Store the ringbuf in the object so it gets collected when we're alive * Make UART objects have a finaliser so they are deinit when their memory is freed * Copy bytes into the ringbuf from the FIFO after we read to ensure the interrupt is enabled ASAP * Copy bytes into the ringbuf from the FIFO before measuring our rx available because the interrupt is based on a threshold (not > 0). For example, a single byte won't trigger an interrupt.
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r = u.read(64 + 10)
run code formatting script
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print(i, u.in_waiting) # should be 0
A few minor fixes for corner cases * Always clear the peripheral interrupt so we don't hang when full * Store the ringbuf in the object so it gets collected when we're alive * Make UART objects have a finaliser so they are deinit when their memory is freed * Copy bytes into the ringbuf from the FIFO after we read to ensure the interrupt is enabled ASAP * Copy bytes into the ringbuf from the FIFO before measuring our rx available because the interrupt is based on a threshold (not > 0). For example, a single byte won't trigger an interrupt.
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print(len(r), r)
i += 1