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==================
Serprog (overview)
==================
This page collects information about the serprog protocol and the programmers implementing it.
Protocol
========
See :doc:`/supported_hw/supported_prog/serprog/serprog-protocol`. It is designed to be compact and allow efficient storage in limited memory of programmer devices.
AVR flasher by Urja Rannikko
============================
.. image:: 300px-Avr_rs232_programmer.jpg
The Prototype RS232 AVR parallel flash programmer of Urja Rannikko was the first implementation of the serprog protocol.
The source code can be found `here <https://github.com/urjaman/frser-atmega88>`_.
InSystemFlasher by Juhana Helovuo
=================================
This was the first one that talks to SPI devices via serial over USB.
Details can be found in the `coreboot wiki <https://www.coreboot.org/InSystemFlasher>`_ and in this
`coreboot mailing list thread <https://mail.coreboot.org/pipermail/coreboot/2011-February/063349.html>`_.
atmegaXXu2-flasher by Stefan Tauner
===================================
Like the InSystemFlasher this one uses LUFA on an AVR microcontroller to tunnel the serial data over USB.
.. image:: 300px-AtmegaXXu2-flasher.jpg
Various Arduino based flashers
==============================
Frser-duino
-----------
This project contains `source code <https://github.com/urjaman/frser-duino/>`_ to install on Arduino devices.
This developer also have various ports on `github repo <https://github.com/urjaman?tab=repositories>`_ for several microcontroller boards, such as:
* `frser-teensyflash <https://github.com/urjaman/frser-teensyflash>`_: A port for the teensy microcontroller board
There also various other interesting projects such as:
* `fast-usbserial <https://github.com/urjaman/fast-usbserial>`_: A software to make arduino with 8u2 or 16u2 flashing faster and more reliable]
* :ref:`arduino shield`
Using a 5v Arduino at 3.3V
--------------------------
Information on it can be found in this doc: :doc:`/supported_hw/supported_prog/serprog/arduino_flasher_3.3v`
5V arduino with level shifter
-----------------------------
For detailed instructions on how to use different Arduino models to access SPI flash chips see :doc:`/supported_hw/supported_prog/serprog/arduino_flasher`
.. image:: 300px-Serprog_0001.jpeg
Teensy 3.1 SPI + LPC/FWH Flasher
--------------------------------
A Teensy 3.1 based small flasher by Urja Rannikko documented here: :doc:`/supported_hw/supported_prog/serprog/teensy_3_1`
HydraBus multi-tool
-------------------
HydraBus (hardware) with HydraFW (firmware) is an open source multi-tool for learning, developing, debugging, hacking and penetration testing
of embedded hardware. It is built upon an ARM Cortex-M4 (STM32F405). The source code for HydraFW is available
`on GitHub <https://github.com/hydrabus/hydrafw>`_. Refer to `their GitHub Wiki <https://github.com/hydrabus/hydrafw/wiki/HydraFW-SPI-guide#flashrom-usage>`_
for more details on how to use HydraBus with flashrom.
.. image:: 300px-HydraFW_Default_PinAssignment.png
stm32-vserprog by Chi Zhang
-----------------------------
A powerful option is `stm32-vserprog <https://github.com/dword1511/stm32-vserprog#stm32-vserprog>`_, a firmware for various STM32-based boards
that turns them into serprog-based programmers with SPI clock speeds up to 36 MHz.
pico-serprog
------------
`pico-serprog <https://github.com/stacksmashing/pico-serprog>`_ by stacksmashing is a firmware for
`Raspberry Pi Picos <https://www.raspberrypi.com/documentation/microcontrollers/raspberry-pi-pico.html>`_ and other RP2040 based boards which turns them
into a serprog programmer.
Notable forks are:
`Riku_V's fork <https://codeberg.org/Riku_V/pico-serprog>`_ which uses the hardware SPI implementation instead of SPI over PIO (programmable IO) which
sacrifices arbitrary pinouts. The fork also implements custom USB descriptors which allow for custom udev-rules.
Glasgow Interface Explorer by Whitequark
========================================
.. image:: 300px-glasgow-in-case.png
.. image:: 300px-glasgow-pcba.png
The Glasgow Interface Explorer is a tool for programming, debugging, and analysing digital electronics.
It is based on an FPGA and a microcontroller, and can be used as a serprog programmer.
Source for the Glasgow Project can be found here: `Glasgow Project Souce <https://github.com/GlasgowEmbedded/glasgow>`_.
For example use with Flashrom and serprog, see `this blog post <https://cattusqq.github.io/posts/Firmware_Dumping_with_SPI/>`_.
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