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# 1.2.4 PIC32MX Curiosity Development Board: Building and Running the USB Host MSD 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 be download using content manager by following these instructions.

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

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

### Bootloader Application

Project Name | Description
--- | ---
bootloader/firmware/pic32mx470_curiosity.X | MPLABX Project for PIC32MX Curiosity Development Board

### Test Application

Project Name | Description
--- | ---
test_app/firmware/pic32mx470_curiosity.X | MPLABX Project for PIC32MX Curiosity Development Board

## Setting up PIC32MX Curiosity Development Board

- Install an USB UART click board on to the mikroBUS socket J5
- Connect mini USB cable to the USB UART click board. This will enumerate the USB to UART port
  - Note: Ensure that the series resistors on the mikroBUS headers are of value 0 Ohms
- For programming, Connect mini USB cable to the 'Debug USB' connector(J3) on the board to the computer
  - Do not connect the mini USB cable to a USB Hub
- Use the USB micro-B port J12 to connect the USB Device to the USB Host
  - A USB micro AB to type A USB Host receptacle converter will be needed to connect the type A USB Flash Drive to the device
- Jumper J13 must be shorted

## Running the Application

1. Open the test application project test_app/firmware/pic32mx470_curiosity.X in the IDE

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

3. Open the bootloader project bootloader/firmware/pic32mx470_curiosity.X in the IDE

4. Build and program the application using the IDE

5. LED1 will be Turned On once programming is completed and bootloader starts running

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. Copy the generated application binary file to a USB Flash drive from the Host PC

   - <harmony3_path>\bootloader_apps_usb\apps\usb_host_msd_bootloader\test_app\firmware\pic32mx470_curiosity.X\dist\pic32mx470_curiosity\production\pic32mx470_curiosity.X.production.bin

9. Rename the copied application binary file to image.bin

10. Insert the USB Flash Drive with the application binary image.bin to the Host connector on the device

11. Once the application is successfully programmed LED3 should start blinking and the user should see below output on the console

12. Remove the USB Flash Drive from the Host connector

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

## Additional Steps (Optional)

- To bootload any other application refer to the Application Configurations

- Once done repeat the applicable steps mentioned in Running The Application