PorKen

TunerPro patch for a usuable knock light from the 12 or 19 pin diagnostic plug.


Stock, the knock output is too fast to see or log.
This code adds a ~0.1 second sustain (up to ~0.5 possible).

For 88-up EZK bins.
Should work with ST bins, but I haven't tried it.
May freak out a Hammer/Spanner, so stock patch included.

Output is ~1.7 volts, so a LED can be plugged right in.
Logging with a SSI-4, wire to negative input, leave positive empty.


XDF - rename .txt to .xdf
knock light patch - TP5_EZK_knock_light.txt

TunerPro 5.0
download page

PorKen

12-pin
04 knock
02 ground

19-pin
?? knock
?? ground


12-pin

PorKen

Wired to SSI-4 on negative input (positive empty).

Blue line is knock voltage.

PorKen

Port P2.6 is the knock output line.
Grey is the unchanged code, black new, blue replaced.


8051 code

4205 jnb RAM_20.5, code_20B
4208 orl P2, #0x40
420B movx A, @R0
420C mov P2, #0x2F


4943 acall code_4DEF (mov C, RAM_20.6)
4945 mov RAM_20.5, C


4DEF mov C, RAM_20.6
4DF1 jc code_4DFC
4DF3 mov C, RAM_20.5
4DF5 jnc code_4DFF
4DF7 djnz RAM_6C, code_4DFF
4DFA mov C, RAM_20.6
4DFC mov RAM_6C, #0x33
4DFF ret