1.1 SPI Bootloader

This example application shows how to use the Bootloader Library to bootload an application using SPI protocol.

Bootloader Application

  • This is a bootloader application which resides from starting location of the device Flash memory

  • It uses SPI peripheral library in Non-interrupt mode

  • Trigger methods:

    • It uses the On board Switch as bootloader trigger pin to force enter the bootloader at reset of device

    • It checks for bootloader request pattern (0x5048434D) from the starting 16 Bytes of RAM to force enter bootloader at reset of device

SDCARD Host Application

  • This is a embedded SPI host application which sends the application image stored in the SD card to the target board over the SPI communication

  • The user application binary is copied into an SD card and inserted in the SD card connected on the host board

Test Application

  • This is a test application which resides from end of bootloader size in device Flash memory

  • It will be loaded into Flash memory by bootloader application

  • It blinks an LED and provides console output

  • It uses the On board Switch to trigger the bootloader from firmware (May not be supported on all devices)

    • Once the switch is pressed it loads first 16 bytes of RAM with bootloader request pattern (0x5048434D) and resets the device