Initial Release

multicore/hello_multicore/CMakeLists.txt

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+add_executable(hello_multicore
+        multicore.c
+        )
+
+# Add pico_multicore which is required for multicore functionality
+target_link_libraries(hello_multicore
+        pico_stdlib
+        pico_multicore)
+
+# create map/bin/hex file etc.
+pico_add_extra_outputs(hello_multicore)
+
+# add url via pico_set_program_url
+example_auto_set_url(hello_multicore)

multicore/hello_multicore/multicore.c

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+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "pico/multicore.h"
+
+#define FLAG_VALUE 123
+
+void core1_entry() {
+
+    multicore_fifo_push_blocking(FLAG_VALUE);
+
+    uint32_t g = multicore_fifo_pop_blocking();
+
+    if (g != FLAG_VALUE)
+        printf("Hmm, that's not right on core 1!\n");
+    else
+        printf("Its all gone well on core 1!");
+
+    while (1)
+        tight_loop_contents();
+}
+
+int main() {
+    stdio_init_all();
+    printf("Hello, multicore!\n");
+
+    ///tag::setup_multicore[]
+
+    multicore_launch_core1(core1_entry);
+
+    // Wait for it to start up
+
+    uint32_t g = multicore_fifo_pop_blocking();
+
+    if (g != FLAG_VALUE)
+        printf("Hmm, that's not right on core 0!\n");
+    else {
+        multicore_fifo_push_blocking(FLAG_VALUE);
+        printf("It's all gone well on core 0!");
+    }
+
+    ///end::setup_multicore[]
+}