有人写过J1850协议的驱动吗？

jack_zhou

这货实在太老了，资料有太TMD坑壁了，搞了好几天了，唉

正点原子

帮顶

CarProg

j1850-uart

J1850PWM to CDC/UART adapter based on STM32

Simple tool for communicating with J1850 PWM bus (MSM6636/MSM6636B) using interrupts.

This bus commonly used in Nissan and Infinity cars for Xanavi/Clarion multimedia and wheel buttons.

Used STM32F103C8T6 chip's two hardware timers:

• TIM2 PWM Capture - JNet SOF & Bits reading
• TIM3 overrun interrupt - read timeouts and w/o interrupt - generation.
  

DONE:

• JNET
• Detect SOF, EOF.
• Read from JNet (CRC Fast checked).
• Make IFR after EOD if enabled (config.h).
• Write to JNet.
• CDC
• Send 11 byte right filled with 0x00 packets to CDC
• Read packets from CDC (CR is terminator)
  

WIP:

• Documentation (Build, Schematic, PCB)
• JNet from/to UART
  

WONTFIX: Collision detection

Adapter schematic prototype v0.1:

https://github.com/hunternsk/j1850-uart

CarProg