Initial Release

system/hello_double_tap/CMakeLists.txt

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+add_executable(hello_double_tap
+        hello_double_tap.c
+        )
+
+# Double tap reset into bootrom is injected by linking with the double_tap_usb_boot library
+target_link_libraries(hello_double_tap
+        pico_stdlib
+        double_tap_usb_boot
+        )
+
+pico_add_extra_outputs(hello_double_tap)
+
+# add url via pico_set_program_url
+example_auto_set_url(hello_double_tap)

system/hello_double_tap/hello_double_tap.c

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+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "pico/stdlib.h"
+
+// This is a regular old LED blinking example, however it is linked with double_tap_usb_boot
+// so pressing reset quickly twice, will reset into USB bootloader
+int main() {
+    const uint LED_PIN = 21;
+    gpio_init(LED_PIN);
+    gpio_set_dir(LED_PIN, GPIO_OUT);
+    while (true) {
+        gpio_put(LED_PIN, 1);
+        sleep_ms(250);
+        gpio_put(LED_PIN, 0);
+        sleep_ms(250);
+    }
+}