1.18 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_9x75_curiosity.X | MPLABX project for SAM9X75 Curiosity Development Board |
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 | Description |
|---|---|
| sam_9x75_curiosity.X | SAM9X75 Curiosity Development Board |
Setting Up SAM9X75 Curiosity Development Board
- Connect the UART DEBUG J35 on board to the computer using a UART-FTDI cable (to enable debug com port)
- Connect the USB port J2 on board to the computer using a micro USB cable (to power the board)
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
| Board | Switch Name | LED Name |
|---|---|---|
| SAM9X75 Curiosity Development Board | USER | RGB_LED (Blue) |