1.5 Clock Configuration
This example application shows how to configure the clock system to run the device at maximum frequency. It also outputs a prescaled clock signal on a GPIO pin for measurement and verification.
Description
Clock system generates and distributes the clock for the processor and peripherals. This example application shows how to use the clock manager to configure the device to run at the max possible speed. A prescaled clock signal is routed to GPIO pin to measure the frequency and accuracy of the internal device clock.
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/clock/clock_config/firmware.
To build the application, refer to the following table and open the project using its IDE.
| Project Name | Description |
|---|---|
| pic32mx470_curiosity.X | MPLABX project for Curiosity PIC32MX470 Development Board |
| pic32mx_xlp_sk.X | MPLABX project for PIC32MX274 XLP Starter Kit |
Setting Up the Hardware
The following table shows the target hardware for the application projects.
| Project Name | Description |
|---|---|
| pic32mx470_curiosity.X | Curiosity PIC32MX470 Development Board |
| pic32mx_xlp_sk.X | PIC32MX274 XLP Starter Kit |
Setting Up Curiosity PIC32MX470 Development Board
- Connect an oscilloscope to monitor the PORT pin RPB8 (Pin number #14 on the J14 connector)
- Connect mini USB cable to the ‘Debug USB’ connector(J3) on the board to the computer
Setting Up PIC32MX274 XLP Starter Kit
- Connect an oscilloscope to monitor the PORT pin RPC6 (Pin number #3 on the J2 connector)
- Connect micro USB cable to the ‘Debug USB’ connector(J9) on the board to the computer
Running the Application
- Build and Program the application using its IDE
- Observe a clock of 4 MHz on the clock output pin
- LED should be blinking continuously
| Board | Clock Output Pin | LED Name |
|---|---|---|
| Curiosity PIC32MX470 Development Board | RPB8(Pin number #14 on the J14 connector) | LED1 |
| PIC32MX274 XLP Starter Kit | RPC6 (Pin number #3 on the J2 connector) | LED1 (RED) |