1.4 ADC Interrupt

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

Description

The example configures ADC1 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.

ADC1 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
pic32cz_ca80_curiosity_ultra.XMPLABX project for PIC32CZ CA80 Curiosity Ultra Board

Setting Up the Hardware

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

Project NameBoard
pic32cz_ca80_curiosity_ultra.XPIC32CZ CA80 Curiosity Ultra Board

Setting Up PIC32CZ CA80 Curiosity Ultra Board

  • Connect the Debug USB port on the board to the computer using a micro USB cable
  • ADC Core 1 Channel 0 input is available on PA18 (Pin 3 of EXT1). Connect PA18 to analog input voltage
  • ADC Core 1 Channel 1 input is available on PA17 (Pin 4 of EXT1). Connect PA17 to analog input voltage
  • ADC Core 1 Channel 2 input is available on PA16 (Pin 3 of J403). Connect PA16 to analog 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 PA18 (ADC1_AIN0, Pin 3 of EXT1) and pin PA17 (ADC1_AIN1, Pin 4 of EXT1):
  4. Press switch (SW0) to trigger conversion on ADC1-CH2 (ADC1_AIN2, Pin 3 of J403)