Th3maz1ng/TOSR-04
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Updated the project's welcome page :P

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Th3maz1ng 2021-07-21 23:22:43 +02:00
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README.md
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@ -8,7 +8,48 @@ Indeed, this relay board was meant to be controled by sending very poorly design
## The manual :
**The user guide is available [here](http://web-directories.cf/git/Th3maz1ng/TOSR-04/src/branch/master/documentation/TOSR-0X%20USER%20MANUAL.pdf) if you want to learn more about this module's capabilities**
## The schematic :
**The schematic is available [here](http://web-directories.cf/git/Th3maz1ng/TOSR-04/src/branch/master/schematic/TOSR-04.pdf).**
## Project folder architecture :
``` json
/
|_src This folder contains all the C/C++ file sources.
| \_app This folder contains the main app and it's dependencies.
| |_libs This folder contains all the required 3rd party libraries that should be put in "Arduino\libraries" folder in order for the app to compile.
| |_test This folder contains a test program which was used to test the dependencies.
|
|_schematic This folder contains all the files associated with the schematic
| \_KiCad This folder contains the KiCad files associated with the project.
| |_TOSR-04.pdf Which is the most recent schematic exported as a pdf for quick viewing.
|
|_documentation This folder contains all documentation and resources to work on the project.
|
|_.gitignore
|_LICENSE.md
|_README.md The content of this page
```
## What I am planning to do :
1. Reverse engineer the schematic of this board (because it is not available) (IN PROGRESS)
2. Find the best way to flash a custom firmware on the ATMEGA328PU (TO DO)
1. Reverse engineer the schematic of this board (because it is not available) (DONE !)
- The schematic is now available as a pdf file in the **schematic** folder
2. Find the best way to flash a custom firmware on the ATMEGA328PU (DONE !)
- Check the section : **The best way to flash a firmware** section hereunder
3. Write a custom firmware for it (TO DO)
## The best way to flash a firmware
To be honest, the best way to flash our own firmware on this board is to replace the ATMEGA328PU with one which has the Arduino bootloader burnt on it :-(.<br />
Indeed after looking at the reverse engineered schematic, the SPI pins needed for an ISP are not exposed (they are not even used...).<br />
Fortunately enough, the onboard FTDI seems to be connected with the DTR line which is connected through a capacitor to the ATMEGA's reset pin that is required by the Arduino bootloader.<br />
I will test it this weekend and keep you informed.
## But how to repurpose the removed ATMEGA328PU ?
I will try to restore the chip to a factory state by programming it with a HVPP (High Voltage Parallel Programmer) in order to reset the fuse bytes as well if they are set of course ...<br />
If I succeed, I'll explain how I did it here.
## FAQ
1) Why is it not possible to reprogram the chip or to burn a bootloader on the relay board ?
- The first issue is that the pins required for an ISP are not exposed :(. The way around it would be to parallel program it, but for that you need to desolder the chip anyway.
- The second issue is that the fuse bytes are probably set (I dont actually know for sure) in a way to prevent easy access to the chip. Only a High Voltage Reprogramming of the chip could "unlock it".
***If you have any questions, do not hesitate to contact me at : bugreport[at]laposte[dot]net***