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This commit introduces ESP8266 support for target wiring tests, fixing execution of relevant tests that once failed on that platform. ESP8266 boards need to have GPIO4 and GPIO5 connected together to provide a UART loopback, in order to test whether UART data effectively flows through. The wiring-enabled UART transmission timing test was also updated with measurements compatible with a few ESP8266 test boards. Signed-off-by: Alessandro Gatti <a.gatti@frob.it>
55 lines
1.7 KiB
Python
55 lines
1.7 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 "esp8266" in sys.platform:
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timing_margin_us = 4100
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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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