Upload CMakeLists.txt

led_countdown/CMakeLists.txt

+cmake_minimum_required(VERSION 3.13)
+include(pico_sdk_import.cmake)
+project(led_countdown)
+add_executable(led_countdown main.c)
+
+pico_sdk_init()
+
+pico_enable_stdio_usb(led_countdown 1)
+pico_enable_stdio_uart(led_countdown 1)
+pico_add_extra_outputs(led_countdown)
+
+target_link_libraries(led_countdown pico_stdlib hardware_pwm hardware_clocks)