PIT period change
This example application shows how PIT period can be changed during runtime.
Description
The LED starts blinking at one second intervals. When the switch is pushed the period is cut in half. As the switch is pushed the period is toggled from 1 second interval, .5 second, .25 second intervals, and .125 second intervals. There is no debounce in the switch so it is possible that pressing the switch will jump more than one interval.
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/pit/period_change/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 |
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 |
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
Running the Application
- Build the application using its IDE
- LED toggles every 1 second
- Press switch to change the rate of toggle
Following table provides details of switch and LED:
| Board | Switch Name | LED Name |
|---|---|---|
| SAMA5D2 Xplained Ultra Evaluation Kit | PB_USER | RGB_LED(Blue) |