2cb4d4aa1a
A delay is needed after `rtc_set_datetime()` before the newly set value can be read back. Co-authored-by: Rene Greiner <reneg973@gmail.com>
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/**
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* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stdio.h>
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#include "hardware/rtc.h"
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#include "pico/stdlib.h"
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#include "pico/util/datetime.h"
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/// \tag::hello_rtc_main[]
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int main() {
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stdio_init_all();
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printf("Hello RTC!\n");
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char datetime_buf[256];
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char *datetime_str = &datetime_buf[0];
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// Start on Friday 5th of June 2020 15:45:00
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datetime_t t = {
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.year = 2020,
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.month = 06,
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.day = 05,
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.dotw = 5, // 0 is Sunday, so 5 is Friday
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.hour = 15,
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.min = 45,
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.sec = 00
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};
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// Start the RTC
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rtc_init();
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rtc_set_datetime(&t);
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// clk_sys is >2000x faster than clk_rtc, so datetime is not updated immediately when rtc_get_datetime() is called.
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// tbe delay is up to 3 RTC clock cycles (which is 64us with the default clock settings)
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sleep_us(64);
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// Print the time
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while (true) {
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rtc_get_datetime(&t);
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datetime_to_str(datetime_str, sizeof(datetime_buf), &t);
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printf("\r%s ", datetime_str);
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sleep_ms(100);
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}
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return 0;
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}
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/// \end::hello_rtc_main[]
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