Lab-1: Blinking LED

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Goals

Understand the basic sketch of Azure Sphere High-level Application
Leann how to build & debug Application using Visual Studio
Learn how to use GPIO API from Azure Sphere SDK

Steps

Enable device debug and disable OTA in Azure Sphere utility

azsphere device enable-development
Clone Official Azure Sphere Samples repo

git clone https://github.com/Azure/azure-sphere-samples
Open a local folder in Visual Studio and navigate to the folder of .\azure-sphere-samples\Samples\GPIO\GPIO_HighLevelApp, click Select Folder to open the CMake project.
(Optional) If you're using AVNET Dev Kit (AVNET_MT3620_SK), there're addtional modifications required as the official sample code are based on SEEED Dev Kit (MT3620_RDB board). Azure Sphere OS use hardware definition file to abstract hardware. Double click CMakeLists.txt file in Solution Explorer.

Set the Target Hardware Definition in CMakeLists.txt:
- azsphere_target_hardware_definition is a function to configure the Hardware Target Definition. In this case, please change the value of TARGET_DIRECTORY to avnet_mt3620_sk and save (CTRL+S). A CMake cache generation process will start and complete soon with '1> CMake generation finished.' message display at the end.
Select GDB Debugger (HLCore) as debug target and press F5 to start build and load target application onto device for debugging.
RED LED start to blink after Application is loaded. Press Button A will change the blinking rate. Both LED and Button A are connected to GPIO pin and controlled by the high-level Application.
Please search for function BlinkingLedTimerEventHandler and set a breakpoint on the line where function GPIO_SetValue is being called by pressing F9, you will see the program is halt and stop on this line. Continue with F5 and now you can control the ON/OFF state of LED.

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