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5bafb0bf68
All the existing `machine.UART` tests in extmod and extmod_hardware are converted to use the new `target_wiring` scheme, which removes a lot of duplicated board-specific settings. All the existing boards that were supported by these UART tests now have their own `target_wiring` file. Some configurations are board specific (eg NUCLEO_WB55) and others are port specific. Signed-off-by: Damien George <damien@micropython.org>
53 lines
1.6 KiB
Python
53 lines
1.6 KiB
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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from target_wiring import uart_loopback_args, uart_loopback_kwargs
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initial_delay_ms = 0
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bit_margin = 0
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timing_margin_us = 100
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# Tune test parameters based on the target.
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if "alif" in sys.platform:
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bit_margin = 1
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elif "esp32" in sys.platform:
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timing_margin_us = 400
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elif "mimxrt" in sys.platform:
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initial_delay_ms = 20 # UART sends idle frame after init, so wait for that
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bit_margin = 1
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elif "nrf" in sys.platform:
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timing_margin_us = 130
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elif "pyboard" in sys.platform:
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initial_delay_ms = 50 # UART sends idle frame after init, so wait for that
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bit_margin = 1 # first start-bit must wait to sync with the UART clock
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elif "rp2" in sys.platform:
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timing_margin_us = 180
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elif "samd" in sys.platform:
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timing_margin_us = 300
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bit_margin = 1
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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_loopback_args, baudrate=bits_per_s, **uart_loopback_kwargs)
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time.sleep_ms(initial_delay_ms)
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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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delta_us = abs(duration_us - expect_us)
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margin_us = timing_margin_us + bit_margin * 1_000_000 // bits_per_s
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print(bits_per_s, delta_us <= margin_us or delta_us)
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