HossamElwahsh / firmware_update_over_can

EME - Egypt Makes Electronics

Class 3 SEITech Solutions

Team Members

• Hossam Elwahsh (1055) -
• Ahmed Hisham (1023) -
• Ahmed Sakr (755) -
• Nada Salloum (1139) -
• Salma Faragalla (199) -
• Norhan Mohamed (764) -

ARM Project

Firmware update over the CAN bus

Project Description

This project provides a simple framework for performing firmware updates for STM32F103C8T6 microcontroller over the CAN bus.
A custom bootloader is responsible for switching between the 2 firmware versions using 2 buttons.

Objective

Update the initial firmware running on the STM32 that toggles the blue LED every 2 sec.
to a new firmware that toggles the blue LED every 1 sec.

Video - Youtube:

Communication Plan

Dist Files

ECU	APP	Build File	Description
1	Custom Bootloader	hex	Handles switching between updates, Supports override mode by holding SW (1) to force boot into "main application" skipping loading updated app which is the default behavior if found.
1	Main Application	hex	Main firmware application handles CAN communication, checking for updates, OLED display step by step, Toggles an LED every 2 seconds in the background.
2	Update Server	hex	Runs on a separate ECU, Communicates over CAN, serves new updates to requesting ECUs
-	Blink Update	hex	Updated application that blinks LED every 1 second

Memory Map

APP	Address Range	Flash Size
Custom Bootloader	0x0800 0000 - 0x0800 1800	6K
Updated Application	0x0800 1C00 - 0x0800 3800	7K
Main Application	0x0800 4C00 - 0x0800 AC00	24K

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General Operational Notes

To add a New Update Application to the server ECU

1. Convert updated firmware Bin file e.g. LED_Blink.bin to an array using this tool: https://notisrac.github.io/FileToCArray/
2. Add Padding of 0xFF if needed to keep array_size % 8 = 0 to facilitate flashing
3. Make sure your data array won't exceed 7000 bytes [per design - updated will be refused]
4. Update app2_data.h APP_UPDATE_SIZE with the new array size
5. Update app2_data.c with the new array contents
6. Re-compile and flash

Notes on Bootloader Operation

• Bootloader automatically checks if there's a new version flashed, if yes it will boot to the new updated version directly.
• Bootloader behavior can be overridden by holding (SW-1) or (SW-2) during boot to force entry of Application 1 (main app) or Application 2 (update) respectively.