1.1.2 PIC32MK GP Development Kit: Building and Running the USB Device HID Bootloader applications

Downloading and building the application

To clone or download these application from Github,go to the main page of this repository and then click Clone button to clone this repo or download as zip file. This content can also be download using content manager by following these instructions

Path of the application within the repository is apps/usb_device_hid_bootloader/

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

Setting up PIC32MK GP Development Kit

  • Connect a micro USB cable to the USB to UART port J25. This will enumerate as a COM port on the PC.

  • For programming, Connect a micro USB cable to the USB DEBUG port J12

  • Use the micro-AB port J13 (which is located on the bottom side of the board) to connect the USB Device to the USB Host PC

  • Place the Switch S4 direction towards DEVICE

  • Jumper J28 must be open

Running the Application

  1. Open the test application project test_app/firmware/pic32mk_gp_db.X in the IDE

  2. Build the project to generate the binary (Do not program the binary)

  3. Open the bootloader project bootloader/firmware/pic32mk_gp_db.X in the IDE

  4. Build and program the application using the IDE

  5. Once programming is completed and bootloader starts running

    • LED1 will be Turned On

    • HID Custom device with product ID 3C will be enumerated on Host PC

  6. Open the Terminal application (Ex.:Tera Term) on the computer to get test application messages through UART once bootloaded

  7. Configure the serial port settings as follows:

    • Baud : 115200

    • Data : 8 Bits

    • Parity : None

    • Stop : 1 Bit

    • Flow Control : None

  8. Launch the Unified Host application from below path

    • <harmony3_path>/bootloader/tools/UnifiedHost-*/UnifiedHost-*.jar

  9. Configure the Unified host application

    • Select the Device architecture and Protocol as shown below

      hostConfig

    • Click on configure button and select the USB Device as 3C

      hostUSBSetting

    • Load the test application hex file to be programmed using below option

      • <harmony3_path>/bootloader_apps_usb/apps/usb_device_hid_bootloader/test_app/firmware/pic32mk_gp_db.X/dist/pic32mk_gp_db/production/pic32mk_gp_db.X.production.hex

      hostLoadHex

    • Open the Console window of the host application to view application bootloading sequence

      hostToolsConsole

  10. Click on Program Device button to program the loaded test application hex file on to the device

    hostProgramDevice

  11. Following snapshot shows output of successfully programming the test application

    hostSuccess

  12. If above step is successful then LED3 should start blinking and you should see below output on the console

    output

  13. Press and hold the Switch S1 to trigger Bootloader from test application and you should see below output

    output

  14. Repeat Steps 10-12 once and jump to Step-15

    • This step is to verify that bootloader is running after triggering bootloader from test application in Step 13

  15. Press and hold the Switch S1 and then press MCLR button or Power cycle the device to force trigger bootloader at startup

  16. Repeat Steps 10-12 once

    • This step is to verify whether bootloader is triggered by switch press at reset

Note

  • Unified Host application has to be closed in order to program any application using MPLAB X IDE