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rp2/machine_rtc: Add initial support for RTC.

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Initial support for machine.RTC on rp2 port. It only supports datetime()
method and nothing else. The method gets/returns a tuple of 8 items, just
like esp32 port, for example, but the usec parameter is ignored as the RP2
RTC only works up to seconds precision.

The Pico RTC isn't very useful as the time is lost during reset and there
seems to be no way to easily power up just the RTC clock with a low current
voltage, but still there seems to be use-cases for that, see issues #6831,
and a Thonny issue #1592. It was also requested for inclusion on v1.15
roadmap on #6832.

Signed-off-by: Krzysztof Adamski <k@japko.eu>
This commit is contained in:
Krzysztof Adamski
2021-02-18 19:45:23 +01:00
committed by Damien George
parent c0499bc2b9
commit 37d01d4be3
4 changed files with 125 additions and 0 deletions
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ports/rp2/modmachine.h
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@@ -7,6 +7,7 @@ extern const mp_obj_type_t machine_adc_type;
extern const mp_obj_type_t machine_hw_i2c_type;
extern const mp_obj_type_t machine_pin_type;
extern const mp_obj_type_t machine_pwm_type;
extern const mp_obj_type_t machine_rtc_type;
extern const mp_obj_type_t machine_spi_type;
extern const mp_obj_type_t machine_timer_type;
extern const mp_obj_type_t machine_uart_type;