1.55 TrustZone Systick Periodic Timeout - PIC32CMLS00

This example application shows how to use the SysTick to generate periodic interrupts on both Secure and Non-secure modes.

Description

This demonstrates TrustZone feature and uses two projects viz., Secure and Non-Secure Project that work together on the same MCU and offering security isolation between the Trusted and the Non-trusted resources in the device.

  • Secure project uses secure SysTick timer to generate periodic interrupt every 50ms to toggle a GPIO pin and an LED0
  • Non-secure project uses non-secure SysTick timer to generate periodic interrupt every 100ms to toggle a GPIO pin and an LED1

Components Used

  • Systick - Secure and non-secure systicks
  • LED0 - Configured as secure mode
  • LED1 - Configured as non-secure mode
  • SECURE_PIN and NON_SECURE_PIN - Configured as secure and non-secure mode respectively

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 as shown below:
TypePath
Project Groupapps/trustZone/systick/systick_periodic_timeout_ls00
Secure Projectapps/trustZone/systick/systick_periodic_timeout_ls00/Secure/firmware
Non-Secure Projectapps/trustZone/systick/systick_periodic_timeout_ls00/NonSecure/firmware
To build the application, refer to the following table and open the project using its IDE.
Project NameDescription
pic32cm_ls00_cpro_Secure.X

pic32cm_ls00_cpro_NonSecure.X

Secure and Non-secure MPLABX project for PIC32CM LS00 Curiosity Pro Evaluation Kit

Setting Up the Hardware

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

Project NameBoard
pic32cm_ls00_cpro_Secure.X

pic32cm_ls00_cpro_NonSecure.X

PIC32CM LS00 Curiosity Pro Evaluation Kit

Setting Up PIC32CM LS00 Curiosity Pro Evaluation Kit

  • Connect the Debug USB port on the board to the computer using a micro USB cable
  • Connect an oscilloscope/Logic analyzer to monitor the PORT pin PA10 (Pin #5 on EXT1)
  • Connect an oscilloscope/Logic analyzer to monitor the PORT pin PA11 (Pin #6 on EXT1)

Running the Application

  1. Open the project group in the MPLAB X IDE and set the non-secure project as main project
  2. Build and program the application
  3. Observe the output for PIC32CM LS00 Curiosity Pro Evaluation Kit as follows:
    • LED0(Green) and PA10 (Secure pin) is toggled every ~50ms in secure project.
    • LED1(Red) and PA11 (Non-secure pin) is toggled every ~100ms in non-secure project