|Possible communication that provides variety speed and bit-level same as my thinking on the PIC.|
|Hi ,I'm Tokeo as
named "OYAJI" at Chiba county of Japan.|
In the past, I had tried to communicate with my car after making up some communication program to attack the ECU that seems OBDII based on ISO-9141.
But, he didn't say anything....
Well,,, the program at that time was embedded in PIC16F877.
If it's use for only yourself and not problem, you are welcome to use the following for try.
|Name "Nego277", that advanced from ULC-tutorial at Tuning-B and planned base by WBB_OBD2.|
|Description:||This mediates interfaces between
single-line and RS232C as a half-duplex synchronized communication.|
May think the single-line same as K-line.
May think the RS232C is connected with PC.
In addition,communicating the side of single-line has possibility to variety speed
and bit-level by operation from RS232C's command.
|Spec of RS232C side:||1
Some command-characters ("b","Z" and "0-9A-F" follows "b") are defined to setup for single-line. And, be sent or be received data is expressed as HEX-characters ("00","01",,"FF" at capital letter).
|Spec of single-line side:||1
bps :19200bps-5bps be set up by operation from PC connecting to RS232C.
Line's level ("Port-ON or Port-OFF",specified as logic 0) is set up by operation from PC also.
|Experienced trust:||Test environment is communicating
between PC(RS232C-side) and PC(single-line).|
After bps set up, interactive communication was good at 300bps,1200bps,4800bps,9600bps,19200bps.
Receiving at 9600bps after sending at 5bps was good also.
The various time scale and bit-level was tested by oscilloscope.
But, try was unsuccess at my car.
|Embedded to:||PIC16F877 provided by Microchip Corp.|
|For build :||builds development environment
MPLAB available that can be downloaded from Microchip Corp web site.
Building from progarm source code:
HEX-File for pressing to PIC-Chip:
|A schematic circuit:||
This photo is Nego277 made by me so very simple.
|A English manual :||
|At the last:||I'm pleased with your visit and I thank
you for your reading though this page is unskillful English.|
I hope that your try is success and getting message from you for improving this.
Writer,and planner,and acter is:
H.tokeo(Singo Bluse Nabeshima) at 2003/07/29.
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