ASF SAM D21 Firmware Generator for USB Host Mass Storage Bootloader

Introduction

SAM D21 Firmware generator application is to provide a easy way to generate firmware with CRC32 and signature bytes. The firmware is fully compatible for the SAM D21 USB Host MSC Bootloader.

• Do complete chip erase.
• Program the firmware generator application
• Load the application firmware into U-disk. Connect it to the SAM D21 USB MSC Host.
• Application generates & appends CRC32 with signature bytes to the whole binary.

Bootloader Configuration

Bootloader Configurations are managed in conf_bootloader.h

• CONSOLE_OUTPUT_ENABLED -> Enable/disable the Console message output
• APP_START_OFFSET -> Application starting offset from Flash
• FIRMWARE_IN_FILE_NAME -> Input Application Firmware
• FIRMWARE_OUT_FILE_NAME -> Output Application Firmware for bootloader
• APP_SIGNATURE -> Signature bytes to be verified

Application Output Format

The application binary structure is modified by the firmware generator. The final application binary structure would be as below

• 4 bytes -> CRC
• 12 bytes -> Signature Data
• Rest data -> Input Firmware

A sample application binary output is provided for testing with the firmware generator.

Dependencies

The application uses the following module groups:

• Application Implementation:
  • main.c
  • main.h
• Configuration Files
  • conf_bootloader.h
  • conf_board.h
  • conf_clocks.h
  • conf_fatfs.h
  • conf_access.h
  • conf_dma.h
  • conf_extint.h
  • conf_uart_serial.h
  • conf_usb_host.h
  • conf_sleepmgr.h
• Basic modules:
  Startup, board, clock, interrupt, power management
• USB host stack and MSC modules:
  services/usb/
  services/usb/uhc/
  services/usb/class/msc/host/
• FATFS File System:
  thirdparty/fatfs