PIO polling
This example application shows how to poll the switch input, and indicate the switch status using the LED.
Description
This application uses the PIO Peripheral library to read GPIO pin connected to the switch, and drives the GPIO pin connected to the LED to indicate switch status. LED is turned ON when the switch is pressed and turned OFF when the switch is released.
Downloading and building the application
To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.
Path of the application within the repository is apps/pio/pio_led_on_off_polling/firmware .
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| sam_a5d2_xult.X | MPLABX project for SAMA5D2 Xplained Ultra Evaluation Kit |
| sam_a5d27_som1_ek.X | MPLABX project for SAMA5D27-SOM1-EK1 |
Setting up AT91Bootstrap loader
To load the application binary onto the target device, we need to use at91bootstrap loader. Refer to the at91bootstrap loader documentation for details on how to configure, build and run bootstrap loader project and use it to bootstrap the application binaries.
Setting up the hardware
The following table shows the target hardware for the application projects.
| Project Name | Board |
|---|---|
| sam_a5d2_xult.X | SAMA5D2 Xplained Ultra Evaluation Kit |
| sam_a5d27_som1_ek.X | SAMA5D27-SOM1-EK1 |
Setting up SAMA5D2 Xplained Ultra Evaluation Kit
Setting up the board
- Short jumper JP2 (DEBUG_DIS)
- Connect the Debug USB port on the board to the computer using a micro USB cable
Setting up SAMA5D27-SOM1-EK1
Setting up the board
- Connect the Debug USB port on the board to the computer using a micro USB cable
Running the Application
- Build the application using its IDE
- LED is turned ON when the switch is pressed and turned OFF when the switch is released
Following table provides details of switch and LED:
| Board | Switch Name | LED Name |
|---|---|---|
| SAMA5D2 Xplained Ultra Evaluation Kit | PB_USER | RGB_LED(Green) |
| SAMA5D27-SOM1-EK1 | USER | D5(Green) |