User manual

The Demonstration Application

2.2.4 Real-Time Data Capture (Multitasking with USB Embedded

Host)

An extension of the Data Graphing demo shows many of the capabilities of the PIC24F

microcontroller, all running at the same time: interactive display, multitasking and USB

embedded host functionality. This feature allows users not only to graph data and view

the results in real time, but also accurately record the results to an external device.

To access this demo, first insert a USB Flash drive into the USB A-receptacle (J4).

Select “Demos” from the main menu, then “Capture” from the “Demonstrations” menu.

A graph identical in operation to that in the Data Graphing demo appears. (If a Flash

drive is not present, a prompt screen will appear instead.) The difference is that the

digital value from the potentiometer conversion is written to the Flash drive to a new

comma delimited file, CAPTURE.csv. Data is written with a second value representing

the time of capture. As the application is configured, the capture interval is 10 ms, and

is independent of the graphic display’s update rate.

To exit the demo and return to the main menu, press the center touch pad.

FIGURE 2-7: DATA GRAPHING DISPLAYS

2.2.5 Other Interactive Demos

As a final demonstration of the starter kit’s processing power and graphics display

capabilities, several other interactive demos are provided for the user to investigate.

These are accessed by selecting “Games” from the main menu.

Users may find that the three demos provided (“Shu Box”, “Shapelet” and “Blaster”)

similar to some vintage video games. As such, the operations of these demos are

regarded to be self-explanatory. Users who require more information will find additional

instructions in the comments accompanying the application source code.

Pot. Capture

Insert USB flash drive...

Pot. Capture