Initial import

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.12)
+
+include(pico_sdk_import.cmake)
+
+project(morningtown C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+
+# Initialize the SDK
+pico_sdk_init()
+
+add_executable(morningtown morningtown.c)
+target_link_libraries(morningtown pico_stdlib hardware_rtc)
+pico_add_extra_outputs(morningtown)

compile

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+#!/bin/sh
+
+export PICO_SDK_PATH=/mnt/datassd/2023/pico/pico-sdk/
+rm -rf build
+mkdir build
+cd build
+cmake ..
+cd ..
+make -C build
+

morningtown.c

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+#include <pico/stdlib.h>
+#include <hardware/rtc.h>
+#include <pico/util/datetime.h>
+
+#define LED_GREEN 21
+#define LED_RED 22
+
+static void alarm_callback()
+{
+	datetime_t t = {0};
+	rtc_get_datetime(&t);
+
+	if ( (t.hour == 7) && (t.min >= 15) ) {
+		gpio_put(LED_RED, 0);
+		gpio_put(LED_GREEN, 1);
+	} else if ( (t.hour >= 8) && (t.hour < 12) ) {
+		gpio_put(LED_RED, 1);
+		gpio_put(LED_GREEN, 1);
+	} else {
+		gpio_put(LED_RED, 0);
+		gpio_put(LED_GREEN, 0);
+	}
+}
+
+
+static void start_demo()
+{
+	int i;
+	for ( i=0; i<10; i++ ) {
+		gpio_put(LED_RED, 1);
+		gpio_put(LED_GREEN, 0);
+		sleep_ms(250);
+		gpio_put(LED_RED, 0);
+		gpio_put(LED_GREEN, 1);
+		sleep_ms(250);
+	}
+}
+
+
+int main()
+{
+	gpio_init(LED_GREEN);
+	gpio_init(LED_RED);
+	gpio_set_dir(LED_GREEN, GPIO_OUT);
+	gpio_set_dir(LED_RED, GPIO_OUT);
+
+	datetime_t t = {
+		.year  = 2023,
+		.month = 2,
+		.day   = 5,
+		.dotw  = 0, /* 0=Sunday */
+		.hour  = 22,
+		.min   = 25,
+		.sec   = 0
+	};
+	rtc_init();
+	rtc_set_datetime(&t);
+
+	/* Prove we're awake, then reset everything */
+	start_demo();
+	gpio_put(LED_RED, 0);
+	gpio_put(LED_GREEN, 0);
+
+	datetime_t alarm = {
+		.year  = -1,
+		.month = -1,
+		.day   = -1,
+		.dotw  = -1,
+		.hour  = -1,
+		.min   = -1,
+		.sec   = 0
+	};
+
+	rtc_set_alarm(&alarm, &alarm_callback);
+
+	while (1);
+}

pico_sdk_import.cmake

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+# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
+
+# This can be dropped into an external project to help locate this SDK
+# It should be include()ed prior to project()
+
+if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
+    set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
+    message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
+    set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
+    message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
+    set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
+    message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
+endif ()
+
+set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
+set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
+set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
+
+if (NOT PICO_SDK_PATH)
+    if (PICO_SDK_FETCH_FROM_GIT)
+        include(FetchContent)
+        set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
+        if (PICO_SDK_FETCH_FROM_GIT_PATH)
+            get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
+        endif ()
+        # GIT_SUBMODULES_RECURSE was added in 3.17
+        if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+                    GIT_SUBMODULES_RECURSE FALSE
+            )
+        else ()
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+            )
+        endif ()
+
+        if (NOT pico_sdk)
+            message("Downloading Raspberry Pi Pico SDK")
+            FetchContent_Populate(pico_sdk)
+            set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
+        endif ()
+        set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
+    else ()
+        message(FATAL_ERROR
+                "SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
+                )
+    endif ()
+endif ()
+
+get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
+if (NOT EXISTS ${PICO_SDK_PATH})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
+endif ()
+
+set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
+if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
+endif ()
+
+set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
+
+include(${PICO_SDK_INIT_CMAKE_FILE})