1.4 ADC Interrupt

This example application shows how to use the ADC Peripheral library in interrupt mode to convert multiple analog inputs.

Description

The example configures ADC0 channel 0 and channel 1 in scan mode. The scan trigger source is configured as ADC trigger event. RTC is configured to generate a periodic RTC compare match event. ADC trigger is configured as the user of the RTC compare match event. ADC starts conversion of channel 0 and channel 1 on every scan trigger and generates a end of scan interrupt when conversion for both the channels is complete.

ADC0 channel 2 is configured to start conversion on global software trigger and is initiated by user pressing a switch on the development board. The application prints the ADC count and the corresponding analog voltage on the serial terminal.

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/adc/adc_interrupt/firmware.

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

Project NameDescription
pic32cm_gc_curiosity_pro.XMPLABX project for PIC32CM GC00 Curiosity Pro Board

Setting Up the Hardware

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

Project NameDescription
pic32cm_gc_curiosity_pro.XPIC32CM GC00 Curiosity Pro Board

Setting Up PIC32CM GC00 Curiosity PRO Board

  • Connect the Debug USB port on the board to the computer using a micro USB cable
  • ADC Core 0 Channel 0 input is available on PA03 (Pin 3 of EXT1). Connect PA03 to anlog input voltage.
  • ADC Core 0 Channel 1 input is available on PA04 (Pin 4 of EXT1). Connect PA04 to anlog input voltage.
  • ADC Core 0 Channel 2 input is available on PA05 (Pin 3 of EXT2). Connect PA05 to anlog input voltage.

Running the Application

  1. Build and Program the application using its IDE.
  2. Connect to the PKOB4 Virtual COM port and configure the serial settings as follows:
    • Baud : 115200
    • Data : 8 Bits
    • Parity : None
    • Stop : 1 Bit
    • Flow Control : None
  3. The demo application will print the ADC count and the corresponding analog voltage measured on pin PA03 (ADC0_AIN0, Pin 3 of EXT1) and pin PA04 (ADC0_AIN1, Pin 4 of EXT1):
  4. Press switch SW0 to trigger conversion on ADC0-CH2 (ADC_AIN2, Pin 3 of EXT2).