1.19 PIT Period Change

The LED starts blinking at one second intervals. When the switch is pushed the timer is stopped. When the switch is pressed again, the period is cut in half and the timer is restarted. The timer is turned off and on every alternate switch press. When the timer is started on every alternate switch press, the period is also toggled from .5 second, .25 second intervals, .125 second intervals and 1 second intervals. There is no debounce in the switch so it is possible that pressing the switch will jump more than one interval.

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.

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.

The following table shows the target hardware for the application projects.

1. Build the application using its IDE
2. LED toggles every 1000 ms
3. Press switch to stop the timer and hence the LED toggle
4. Pressing the switch again starts the timer and changes the rate of LED toggle
5. The application alternates between step 6 and 7 on each switch press