1.51 TrustZone Low-Power Features

Description

This example application configures RTC to generate an interrupt or event (regarding sleep mode and configuration) to start an ADC conversion from light sensor value every 1 ms. The DMAC move the converted value from ADC Result to internal SRAM and after 10 transfers, DMA generates an interrupt to wake-up core and process data through DGI SPI pins. Application initial sleep mode state is IDLE mode. Pressing the SW0 button allows to go from one sleep mode to another.

Below is the low-power configuration for this application:

Voltage Regulator is a Buck Converter
Low Power Efficiency Mode is enabled
Performance Level 2 (PL2) Mode is selected
Power Domain Switchable (PDSW) is always ACTIVE

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:


Type	Path
Project Group	apps/trustZone/low_power_features_ls00
Secure Project	apps/trustZone/low_power_features_ls00/Secure/firmware
Non-Secure Project	apps/trustZone/low_power_features_ls00/NonSecure/firmware

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


Project Name	Description
pic32cm_ls00_cpro.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 Name	Board
pic32cm_ls00_cpro_Secure.X pic32cm_ls00_cpro_NonSecure.X	PIC32CM LS00 Curiosity Pro Evaluation Kit
I/O1 Xplained Pro Extension Kit	I/O1 Xplained Pro Extension Kit

Setting Up PIC32CM LS00 Curiosity Pro Evaluation Kit

Plug the I/O1 Xplained Pro Extension Kit to the EXT1 header on the board
Short pin 2 and pin 3 of J205 jumper (XAM is measuring the MCU current consumption)
Connect the Debug USB port on the board to the computer using a micro USB cable

Running the Application

Build and Program the application using its IDE
Open and Configure the Microchip’s Atmel Data Visualizer
- Open a Data Streamer in Configuration > Protocols
- Configure and Load the Data Streamer with the DataStream_Configuration text file available in apps/trustZone/low_power_features_ls00/NonSecure/firmware/src/
- Open a Graph in Configuration > Visualization
- Drag & Drop the LightLevel icon to Graph window as a New plot
- Connect the board with DGI Control Panel
- Select SPI & Power interfaces
- Drag & Drop the SPI icon to Data Stream Control Panel
- Start the communication with the board
Cover the light sensor (for example, by placing a hand over it) of I/O1 Xplained Pro Extension Kit and then uncover the light sensor. Observe the SPI Output as below
Observe the power consumption in IDLE mode as below
Press SW0 button to enter STANDBY with IRQ mode and observe the power consumption as below
Press SW0 button to enter STANDBY with SleepWalking mode and observe the power consumption as below
Press SW0 button to enter OFF mode and observe the power consumption as below