Allpro Imaging Driver

Open-source ELM327 OBD adapter

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The AllPro adapter is a small device that plugs into your automobile's On-Board Diagnostic (OBD) port, which grants access to the car's computerized self diagnostic system. All cars manufactured in 1996 and later have an OBD-II port, which is usually located under the dashboard on the driver's side.The adapter allows you to interface with your car's OBD-II bus. It provides you a serial interface using the ELM327 command set and supports all OBD-II standards:

SAE J1850 PWM
SAE J1850 VPW
ISO 9141-2
ISO 14230-4
ISO 15765-4 CAN
SAE J1939

Hardware

All Pro Solutions, Inc. Has been manufacturing a wide range of IT equipment, including CD DVD Blu-Ray disc duplicating, printing, publishing, and data archiving systems, as well as providing a wide range of digital services, including disc duplication, document imaging, scanning & conversion, since 1996.
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The adapter kit schematic is shown here. It is built around NXP LPC1517 Cortex-M3 microprocessor with 64 kB program memory, but can accommodate another chip from same family like LPC1549 with 256 kB if required.The NXP chips has a ROM-based bootloader that supports loading a binary image into its flash memory using USART or CAN.All the software is written in C++ for NXP LPCXpresso IDE which is essentially using GNU toolchain for ARM Cortex-M processors. However, it can be compiled with other pre-built GNU toolchain, like GCC ARM Embedded or even with Keil uVision IDE.

In addition to the driver, PVCAM contains two advanced applications that will be immediately ready for use on the host computer. PVCAMTest is an easy to use imaging application to get users up and running in as little time as possible. Users can confirm that the camera is properly connected, run live, take sequences and also single snaps.

The Highlights

NXP LPC1517JDB48 ARM Cortex M3 72Mhz processor
64kB Flash, 12kB RAM
Using NXP sophisticated State Configurable Timers to do the precise signal handling for J1850 PWM and VPW protocols
CAN FIFO buffers for handling some not-strict ISO-compliant ECUs
Botloader for initial firmware programming
Low power consumption

See building the adapter firmware from the source code. Or, if you just want to program the firmware check the programming the Adapter with Flash Magic. Also, you might consider ELM329 AllPro adapter. It is year 2018 and most likely you need only CAN protocol.

The link to GitHub repository.

The OBD-II Cable Connector

The adapter uses eight pin connector to link up to vehicle's OBD-II J1962.

J4	Description	J1962 Pin
1	Signal Ground	5
2	CAN High	6
3	CAN Low	14
4	J1850 Bus +	2
5	Vehicle Battery Positive	16
7	K Line	7
8	J1850 Bus -	10

Bluetooth AllPro