Getting Started with the DA16200 FreeRTOS SDK

Example: GPIO Control

This example will demonstrate how to import and build one of the example projects from the DA16200 FreeRTOS SDK. This example will utilize the GPIO example project from the <sdk_root_directory>/apps/common/examples/Peripheral folder of the SDK (apps > common > examples > Peripheral > GPIO). The example project is written to read and toggle certain GPIO pins.

The projects folder for the GPIO example, from the Peripheral examples folder of the DA16200 FreeRTOS SDK. (Click to enlarge)

By default, the example project will:

• Toggle the GPIOA0 and GPIOA4 high and low.
• Read the state of GPIOA1.
• The GPIOA2 and GPIOA3 pins will be configured as interrupts:
  • GPIOA2 will be active low.
  • GPIOA3 will be active high.

Below are the prebuilt images for the GPIO example project, using version 3.2.4.0 of the SDK:

Build Project

Users with the DA16200 Thing Plus, can blink the STAT LED by modifying the following lines in the peripheral_sample_gpio.c file in the <sdk_root_directory>/apps/common/examples/Peripheral/GPIO/src folder:

• Replace GPIO_PIN0 with GPIO_PIN11 on lines: 97, 162-163, 170, and 177
• Replace GPIOA[0] with GPIOA[11] on line: 176

Users can also make the print outs in the serial debug interface easier to read by replacing low with low (add a extra space) to lines 177-179.

Once the peripheral_sample_gpio.c file has been modified to suit the users needs, the example project can be imported and built in the Eclipse IDE. Users can then use the serial debug interface to upload the new firmware to the board. Once users reboot the DA16200MOD module, the new firmware should run automatically.

Users who have the DA16200 Thing Plus and have modified the code to toggle the STAT LED will see a blue LED blinking at about 1 second intervals.