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# 1.4 CAN Bootloader

The CAN bootloader Library can be used to upgrade firmware on a target device without the need for an external programmer or debugger.

Features

- Supported on CORTEX-M and MIPS based MCUs
- Uses Harmony 3 CAN PLIB to communicate resulting in smaller bootloader size
- Supports Fail Safe update
- Takes Binary File as input
- Receives Binary from an C Embedded Host Device

Running From SRAM (For SAM Devices)

- Has capability to self update as it is running from SRAM

- At reset the bootloader Reset handler copies the entire bootloader firmware into SRAM from Start location and start executing from SRAM
- Once the application is called from bootloader, applications startup code takes control over SRAM and starts executing

CAN Bootloader Block Diagram

- Input Task:

  - This task is responsible for receiving data from Embedded Host through the CAN interface

  - The task keeps polling for data to be received when bootloader is in idle mode

  - Once the packet reception is completed it gives control to Command Task

- Command Task:

  - The task first validates the incoming packet from host with expected header information

  - The task processes the commands received from Input Task and provides response back to host accordingly

  - If the command received is a Data command it gives control to the Flash Task

- Flash Task:

  - This task is responsible to program the internal flash memory with data packet received

  - The task uses the NVM peripheral library to perform the Unlock/Erase/Write Operations