kopia lustrzana https://github.com/micropython/micropython
35 wiersze
909 B
Python
35 wiersze
909 B
Python
# Test machine.UART transmission.
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# Does not require any external connections.
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try:
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from machine import UART
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except ImportError:
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print("SKIP")
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raise SystemExit
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import time, sys
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# Configure pins based on the target.
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if "rp2" in sys.platform:
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uart_id = 0
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tx_pin = "GPIO0"
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rx_pin = "GPIO1"
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else:
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print("SKIP")
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raise SystemExit
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# Test that write+flush takes the expected amount of time to execute.
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for bits_per_s in (2400, 9600, 115200):
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text = "Hello World"
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uart = UART(uart_id, bits_per_s, bits=8, parity=None, stop=1, tx=tx_pin, rx=rx_pin)
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start_us = time.ticks_us()
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uart.write(text)
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uart.flush()
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duration_us = time.ticks_diff(time.ticks_us(), start_us)
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# 1(startbit) + 8(bits) + 1(stopbit) + 0(parity)
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bits_per_char = 10
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expect_us = (len(text)) * bits_per_char * 1_000_000 // bits_per_s
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print(bits_per_s, duration_us <= expect_us)
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