The aria_quickstart_external_resources (external flash reader) application uses the reads previously programmed binary data from the external non-volatile SQI memory. The Graphics Library is used to render graphics to the display. Using the DMA, the Low-Cost Controllerless (LCC) Display Driver continuously transfers frame data from the frame buffer out to the LCD display. 

The application also features user touch input through the integrated touch screen on the display panel. Touch input from the touch controller goes through the I2C port, and the Input System Service acquires the touch input information from the Touch and I2C drivers. The Input System Service sends touch events to the Graphics Library, which processes these events and updates the frame data accordingly. 

This configuration runs on the PIC32MZ DA Internal DDR Starter Kit with the MEB-II and WQVGA display. The frame buffer is stored in the internal SRAM, and the Low-Cost Controllerless (LCC) display driver is used to manage the DMA that transfers the frame buffer content to the display via the EBI peripheral. 

User touch input on the display panel is received thru the PCAP capacitive touch controller, which sends a notification to the Touch Input Driver. The Touch Input Driver reads the touch information over I2C and sends the touch event to the Graphics Library thru the Input System Service. 

The application reads the binary data from the external non-volatile memory via the SQI peripheral configured with the SST26 driver. 

Demonstration Features 

• Aria Graphics Library 

• Input system service and touch driver 

• Time system service, timer-counter peripheral library and driver 

• GLCD internal LCD display driver 

• 32-bit RGBA8888 color depth (single-layered double buffering) 

• GPU library with accelerated draw commands 

• EBI peripheral library and driver 

• I2C peripheral library and driver 

• SST26 SQI driver

• Images and Fonts for user interface stored in external flash (NVM)

The Project Graph diagram below shows the Harmony components that are included in this application. Lines between components are drawn to satisfy components that depend on a capability that another component provides. 

Adding the “PIC32MZ DA INTERNAL DDR Starter Kit BSP” and “Aria Graphics w/ PDA TM4301b Display” Graphics Template component into the project graph. 

This will automatically add the components needed for a graphics project and resolve their dependencies. It will also configure the pins needed to drive the external peripherals like the display and the touch controller. 

Additional components to support SQI and SST26 needs to be added and connected manually. 

Some of these components are fine with default settings, while other require some changes. The following is a list of all the components that required custom settings. 

For SQI access, make sure all 7 pins for SQI1 is mapped. 

Setup POSC, POSCMOD, System PLL, SYSCLK and REFCLK2 as shown: 

The parent directory for this application is gfx/apps/aria_quickstart_ext_res. To build this application, open the gfx/apps/aria_quickstart_ext_res/firmware/aria_qs_x_r_mzda_intddr_sk_meb2_tm4301b.X project file in MPLABX IDE that corresponds to the hardware configuration. 

The following table lists configuration properties:

Important!

This application may contain custom code that is marked by the comments // START OF CUSTOM CODE ... and // END OF CUSTOM CODE. When using the MPLAB Harmony Configurator to regenerate the application code, use the "ALL" merging strategy and do not remove or replace the custom code.

On the MEB II, the EBIOE and LCD_PCLK (J9) must be jumpered. A connection establishes the GLCD's pixel clock output timing. The external SRAM memory on the board is disabled. The J9 jumper is located on the bottom of the MEB II board, beneath where the starter kit is plugged into the board. Refer to the following figure for the exact location. 

Connect the PIC32MZ DA Starter Kit to the MEB II board 

Power up the board by connecting the power adapter to J3 power connector on the MEB II board or a powered USB cable to the USB DEBUG 

port on the Starter Kit board 

When power-on is successful, the following screen will appear on the display

Pressing the button will cause the application to load a new image. The image cycles in order from Uncompressed RAW with Direct Blit, Uncompressed RAW, Run-Length Encoded (RLE) RAW, to JPEG.

The MPLAB Harmony Graphics Suite logo is also a button. Pressing the logo will toggle the application between English and Simplified Chinese.

Note that all images and glyphs are retrieved from external NVM via QSPI. The application is purposely setup in single-buffer configuration to allow visual inspection of the data retrieval speed of the various images and glyphs.