robert-hh a38b4f4287 esp32/machine_uart: Implement UART.RX_IDLE based on machine.Timer. ...

The UART.IRQ_IDLE callback is called about two character times after the
last byte, or 1 ms, whichever is larger.  For the irq, timer 0 is used.

machine_timer.c had to be reworked to make it's mechanisms available for
machine_uart.c.

The irq.flags() value is change only at a requested event.  Otherwise keep
the state.

Signed-off-by: robert-hh <robert@hammelrath.com>

2024-08-29 16:34:33 +10:00

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