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The test checks whether the message created by the IRQ handler appears about at the end of the data sent by UART. Supported MCUs resp. boards: - RP2040 - Teensy 4.x - Adafruit ItsyBitsy M0 - Adafruit ItsyBitsy M4 - NRF52 (Arduino Nano Connect 33 BLE) Signed-off-by: Damien George <damien@micropython.org>
77 lines
2.2 KiB
Python
77 lines
2.2 KiB
Python
# Test machine.UART.IRQ_TXIDLE firing after a 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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UART.IRQ_TXIDLE
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except (ImportError, AttributeError):
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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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min_window = 1
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elif "samd" in sys.platform and "ItsyBitsy M0" in sys.implementation._machine:
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uart_id = 0
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tx_pin = "D1"
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rx_pin = "D0"
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# For SAMD delay_ms has to be used for the trailing window, and the
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# mininmal time is 11 ms to allow for scheduling.
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min_window = 11
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elif "samd" in sys.platform and "ItsyBitsy M4" in sys.implementation._machine:
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uart_id = 3
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tx_pin = "D1"
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rx_pin = "D0"
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min_window = 11
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elif "mimxrt" in sys.platform:
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uart_id = 1
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tx_pin = None
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min_window = 0
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elif "nrf" in sys.platform:
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uart_id = 0
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tx_pin = None
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min_window = 0
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else:
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print("Please add support for this test on this platform.")
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raise SystemExit
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def irq(u):
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print("IRQ_TXIDLE:", u.irq().flags() == u.IRQ_TXIDLE)
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text = "Hello World" * 20
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# Test that the IRQ is called after the write has completed.
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for bits_per_s in (2400, 9600, 115200):
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if tx_pin is None:
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uart = UART(uart_id, bits_per_s)
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else:
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uart = UART(uart_id, bits_per_s, tx=tx_pin, rx=rx_pin)
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uart.irq(irq, uart.IRQ_TXIDLE)
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# The IRQ_TXIDLE shall trigger after the message has been sent. Thus
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# the test marks a time window close to the expected of the sending
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# and the time at which the IRQ should have been fired.
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# It is just a rough estimation of 10 characters before and
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# 20 characters after the data's end, unless there is a need to
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# wait a minimal time, like for SAMD devices.
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bits_per_char = 10 # 1(startbit) + 8(bits) + 1(stopbit) + 0(parity)
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start_time_us = (len(text) - 10) * bits_per_char * 1_000_000 // bits_per_s
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window_ms = max(min_window, 20 * bits_per_char * 1_000 // bits_per_s + 1)
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print("write", bits_per_s)
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uart.write(text)
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time.sleep_us(start_time_us)
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print("ready")
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time.sleep_ms(window_ms)
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print("done")
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