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These all require hardware connections, so live in a different directory.

Except for the IRQ_BREAK test of ESP32 devices a single UART with loopback
is sufficient.

General:
    SAMD21: Due to the limited flash size only SAMD21 devices with external
    flash support uart.irq().

IRQ_BREAK:
    ESP32 needs different UART devices for creating and sensing a break.
    Lacking a second UART the test is skipped for ESP32S2 and ESP32C3.  RP2
    does not pass the test reliable at 115200 baud, reason to be found.
    Thus the upper limit is set to 57600 Baud.

    Coverage:
        esp32  pass when different UART devices are used.
        rp2    pass up to 57600 baud

IRQ_RX:
    SAMD21: Being a slow device it needs data to be sent byte-by-byte at
    9600 baud, since the IRQ callback is scheduled delayed and then the
    flags do not match any more.  The data matches since it is queued in
    the FIFO resp. ringbuffer.

    CC3200: The test cannot be performed since no calls are accepted in the
    IRQ handler like u.read(). Skipped.

    Coverage:
        cc3200 fail due to major differences in the implementation.
        esp32  pass
        nrf    pass
        renesas-ra pass
        samd   pass see the notes.
        stm32  pass

IRQ_RXIDLE:
    STM32: With PyBoard the IRQ is called several times, but only once with
    the flag IRQ_RXIDLE set.

    Coverage:
        esp32    pass
        mimxrt   pass
        renesas-ra pass
        rp2      pass
        samd     pass for both SAMD21 and SAMD51
        stm32    fail. see notes.
Signed-off-by: Damien George <damien@micropython.org>
Signed-off-by: robert-hh <robert@hammelrath.com>