first commit

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

.vscode/settings.json

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+{
+  "files.associations": {
+    "string": "cpp"
+  }
+}

README.md

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+# PD-Camera project
+
+PD-Camera is an unofficial, experimental accessory for Panic's [Playdate](https://play.date) handheld console, which as the name hopefully suggests allows the device to record pictures as well as animated gifs, in whopping  1-bit color and QVGA (320x240) resolution. Kind of like the [1998 accessory for that other monochrome handheld device](https://en.wikipedia.org/wiki/Game_Boy_Camera).
+
+For more context on how this project came along, you can find its devlog [on Playdate's Dev forum](https://devforum.play.date/t/playdate-oneil-camera/11043/28).
+
+This repository contains the hardware and firmware of the PD-Camera accessory. The source for the companion app that runs on the Playdate itself _will eventually_ be found [here](https://github.com/t0mg/pd-camera).
+
+## Hardware
+
+The project is based on a Teensy 4.1 microcontroller that acts as a USB host to the Playdate and communicates with it over serial, including evaluating payloads in the Lua runtime (see [here](https://github.com/jaames/playdate-reverse-engineering/blob/main/usb/usb.md) for more details). The Teensy is also connected to an OV7670 camera module via its CMOS Sensor Interface (CSI) built into the IMXRT1062 MPU and using [this dedicated library](https://github.com/mjborgerson/OV7670).
+
+A LiPo battery, custom PCB and a custom 3d-printable case complete the assembly (gerber and stl files _will eventually be_ provided in this repository).
+
+For assembly instructions, hop over to the [hardware folder](/hardware/).
+
+## Firmware
+
+The qucickest way to get started is to use the [Teensy loader application](https://www.pjrc.com/teensy/loader.html) to flash a prebuilt firmware.hex file from this repository's releases. Or read on to build your own.
+
+### Building
+
+This project uses [PlatformIO](https://platformio.org/) to manage dependencies and build toolchain, see [platformio.ini](platformio.ini).
+
+The source code comprises a single, messy, [main.cpp](src/main.cpp) file. It relies the following libraries:
+
+  -	[USBHost_t36](https://github.com/PaulStoffregen/USBHost_t36) by [PaulStoffregen](https://github.com/PaulStoffregen)
+  - [OV7670](https://github.com/mjborgerson/OV7670) by [mjborgerson](https://github.com/mjborgerson)
+  - [dithering_halftoning](https://github.com/deeptronix/dithering_halftoning) by [deeptronix](https://github.com/deeptronix)
+
+ ----
+
+ Playdate is © [Panic Inc.](https://panic.com/) - this project isn't affiliated with or endorsed by them in any way (just like [that one](https://github.com/jaames/playdate-reverse-engineering))

hardware/README.md

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+[WIP] This folder will regroup all files and instruction necessary to build the PD-Camera accessory.

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

lua/README.md

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+This folder contains the Lua source files for the 2 functions that are hardcoded as bytecode in [main.cpp](../src/main.cpp), in order for the Teensy to evaluate payloads over serial in the Playdate's lua runtime (see [here](https://github.com/jaames/playdate-reverse-engineering/blob/main/usb/usb.md#eval) for details).
+
+To generate tye bytecode:
+
+  1) write lua function calls in a separate lua file (see [lua](/lua) folder). Add padding to make room for the data you'll need to transmit.
+  2) compile the files to `.pdz` using Playdate SDK's `pdc`
+  3) extract `.luac` with [this Python script](https://raw.githubusercontent.com/jaames/playdate-reverse-engineering/main/tools/pdz.py)
+
+     e.g  `python pdz.py main.pdx\processMessage.pdz .`
+
+  4) convert `.luac` to C byte array with [this tool](https://notisrac.github.io/FileToCArray/)
+  5) paste into C source code and replace the padding with custom data (see  [main.cpp](../src/main.cpp))

lua/source/processImage.lua

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+_cameraImage("00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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lua/source/processStatus.lua

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+_cameraStatus("1")

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:teensy41]
+platform = https://github.com/platformio/platform-teensy.git
+board = teensy41
+framework = arduino
+lib_deps = 
+  https://github.com/mjborgerson/OV7670.git
+	https://github.com/PaulStoffregen/USBHost_t36.git
+  https://github.com/deeptronix/dithering_halftoning.git