1.18 OCMP Compare Mode

This example application shows how to use the OCMP peripheral to generate an active low, active high, and toggle output on compare match.

Description

In this application, three OCMP modules are used to generate waveforms.

Active Low Output: By default output is set as high and it is set as low on the compare match

Active High Output: By default output is set as low and it is set as high on the compare match

Toggled Output: Compare match toggles the output

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/ocmp/ocmp_compare_mode/firmware.

To build the application, refer to the following table and open the project using its IDE.

Project NameDescription
pic32mx470_curiosity.XMPLABX project for Curiosity PIC32MX470 Development Board
pic32mx_eth_sk2.XMPLABX project for PIC32 Ethernet Starter Kit
pic32mx_xlp_sk.XMPLABX project for PIC32MX274 XLP Starter Kit
pic32mx_sk.XMPLABX project for PIC32MX Starter Kit

Setting Up the Hardware

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

Project NameDescription
pic32mx470_curiosity.XCuriosity PIC32MX470 Development Board
pic32mx_eth_sk2.XPIC32 Ethernet Starter Kit
pic32mx_xlp_sk.XPIC32MX274 XLP Starter Kit
pic32mx_sk.XPIC32MX Starter Kit

Setting Up Curiosity PIC32MX470 Development Board

  • Connect mini USB cable to the ‘Debug USB’ connector(J3) on the board to the computer

Setting Up PIC32 Ethernet Starter Kit

  • Connect mini USB cable to the ‘Debug USB’ connector(J7) on the board to the computer

Setting Up PIC32MX274 XLP Starter Kit

  • Connect micro USB cable to the ‘Debug USB’ connector(J9) on the board to the computer

Setting Up PIC32MX Starter Kit

  • Connect mini USB cable to the ‘Debug USB’ connector(J1) on the board to the computer

Running the Application

  1. Build and program the application project using its IDE
  2. Observe active low, active high and toggle output on the oscilloscope
Refer the following table for pin details:
OCMP OutputCuriosity PIC32MX470 Development Board PinsPIC32 Ethernet Starter Kit and PIC32MX Starter Kit PinsPIC32MX274 XLP Starter Kit Pins
OC1 outputRPD0 “Pin 6 of J14”RD0 “LED1”RC7 “Pin 5 of J2”
OC2 outputRPG9 “Pin 10 of J14”RD1 “LED2”RA8 “Pin 13 of J2”
OC3 outputRPB9 “Pin 3 of J14”RD2 “LED3”RB14 “Pin 12 of J2”