Initial Release

rtc/rtc_alarm/rtc_alarm.c

@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) 2021 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "hardware/rtc.h"
+#include "pico/stdlib.h"
+#include "pico/util/datetime.h"
+
+static volatile bool fired = false;
+
+static void alarm_callback(void) {
+    datetime_t t = {0};
+    rtc_get_datetime(&t);
+    char datetime_buf[256];
+    char *datetime_str = &datetime_buf[0];
+    datetime_to_str(datetime_str, sizeof(datetime_buf), &t);
+    printf("Alarm Fired At %s\n", datetime_str);
+    stdio_flush();
+    fired = true;
+}
+
+int main() {
+    stdio_init_all();
+    printf("RTC Alarm!\n");
+
+    // Start on Wednesday 13th January 2021 11:20:00
+    datetime_t t = {
+        .year  = 2020,
+        .month = 01,
+        .day   = 13,
+        .dotw  = 3, // 0 is Sunday, so 3 is Wednesday
+        .hour  = 11,
+        .min   = 20,
+        .sec   = 00
+    };
+
+    // Start the RTC
+    rtc_init();
+    rtc_set_datetime(&t);
+
+    // Alarm 5 seconds later
+    datetime_t alarm = {
+        .year  = 2020,
+        .month = 01,
+        .day   = 13,
+        .dotw  = 3, // 0 is Sunday, so 3 is Wednesday
+        .hour  = 11,
+        .min   = 20,
+        .sec   = 05
+    };
+
+    rtc_set_alarm(&alarm, &alarm_callback);
+
+    while(!fired);
+
+    return 0;
+}