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LINK ECU Binary Protocol
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Hello, I am trying to understand the binary protocol of the link ecu so I can finish implementing it in an android app. I was curious if anyone had any experience with the binary protocol or could understand how to calculate the RPM from the 4th & 5th bytes of the sample? I will be releasing this open source if anyone still uses the FM Link ECU :laugh:
I found a text file included with the data log lab software, it is what I am using to decipher it. Any help would be much appreciated! :D |
My best guess would be to PM Ken Hill on this forum and ask. He helped develop the FM link.
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Alright I will try and message him. Thank you!
My post count is too low :[ - I will leave a visitor message. |
I wrote a windows app that handled the link serial protocol just fine, but that was like 8 years ago and I am not sure what I did with the source code (was many hard drives ago). If I track it down, I'll be sure to try and help.
IIRC, I did bitwise operations to get out the time value and then divided a constant by the time to get the RPM value. Or something like that. |
Found this. Apologies if the code is shit, I wrote it a million years ago in a language I've since forgotten:
this.rpm = calculateRPM(bytearray[3], bytearray[4]); private int calculateRPM(byte high, byte low) { int rpm = 0; try { int increments_per_minute = 1875000; //(usec * 32 per minute) int high_byte = (int)high; int low_byte = (int)low; int time = (high_byte << 5) + (low_byte >> 2); rpm = increments_per_minute / time; } catch { } return rpm; } |
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