stecman

DEVICE = atmega328p
CLOCK  = 16000000
PROGRAMMER = -c arduino -P /dev/ttyUSB0 -b57600

AVRDUDE = avrdude $(PROGRAMMER) -p $(DEVICE)

SOURCES = $(shell find . -name '*.c')
OBJECTS = $(SOURCES:.c=.o)

# Automatic dependency resolution

stecman

import os

# Device definition for the stm8s.h header
# This enables available features of the device library.
STM8_DEVICE_DEFINE = "STM8S003"

# Programmer argument for stm8flash (stlink or stlinkv2)
STM8_PROGRAMMER = "stlinkv2"

# Target device argument for stm8flash

stecman

This is a technique for extracting all imported modules from a packaged Python application as .pyc files, then decompiling them. The target program needs to be run from scratch, but no debugging symbols are necessary (assuming an unmodified build of Python is being used).

This was originally performed on 64-bit Linux with a Python 3.6 target. The Python scripts have since been updated to handle pyc files for Python 2.7 - 3.9.

Theory

In Python we can leverage the fact that any module import involving a .py* file will eventually arrive as ready-to-execute Python code object at this function:

PyObject* PyEval_EvalCode(PyObject *co, PyObject *globals, PyObject *locals);

stecman

#include <avr/interrupt.h>
#include <avr/io.h>
#include <avr/wdt.h>

#include <stdlib.h>
#include <string.h>

void init_usart(void)
{
    cli();

stecman

Controlling the Brother P-Touch Cube label maker from a computer

The Brother PTP300BT label maker is intended to be controlled using the official Brother P-Touch Design & Print iOS/Android app. The app has arbitrary limits on what you can print (1 text object and up to 3 preset icons), so I thought it would be a fun challenge to reverse engineer the protocol to print whatever I wanted.

Python code at the bottom if you want to skip the fine details.

Process

Intitially I had a quick peek at the Android APK to see if there was any useful information inside. The code that handles the communication with the printer in Print&Design turned out to be a native library, but the app clearly prepares a bitmap image and passes it to this native library for printing. Bitmaps are definitely something we can work with.

stecman

<?php

/**
* Find the starting Monday for the given week (or for the current week if no date is passed)
*
* This is required as strtotime considers Sunday the first day of a week,
* making strtotime('Monday this week') on a Sunday return the adjacent Monday
* instead of the previous one.
*
* @param string|\DateTime|null $date

stecman

SCons + SDCC for STM8S

Setting up SCons to build using SDCC was fairly time consuming for someone new to SCons, so here's a basic working config to get you started.

With some tweaking this should also work for other architectures that SDCC supports (z80, z180, mcs51, r2k, etc).

Required software

SCons (build tool)

stecman

-- LR imports
local LrApplication = import("LrApplication")
local LrApplicationView = import("LrApplicationView")
local LrBinding = import("LrBinding")
local LrDevelopController = import("LrDevelopController")
local LrDialogs = import("LrDialogs")
local LrExportSession = import("LrExportSession")
local LrFileUtils = import("LrFileUtils")
local LrFunctionContext = import("LrFunctionContext")
local LrLogger = import("LrLogger")

stecman

This is a collection of code snippets for various features on the STM8S family microcontrollers (specifically the STM8S003F3). These are written against the STM8S/A SPL headers and compiled using SDCC.

Some of this controller's functions aren't particularly intuitive to program, so I'm dumping samples for future reference here. These are based on the STM8S documentation:

• STM8003 datasheet
• STM8S reference manual

Run at 16MHz

stecman

# Open a new kitty terminal window on MacOS
#
# 1. Copy this script into AppleScript Editor and save it somewhere
# 2. Use something like Apptivate to run the script on a global hotkey:
#    http://www.apptivateapp.com/
#
# Note this script doesn't work well as a Service through Automator as the
# "click menu" functionality requires accessibility privileges granted.
# Services run as the focused app, so that setup would require every context
# the shortcut is run from to have accessibility granted.