Continuing on with the MAP sensor work. I'll write this up properly and put it in the MAP sensor wiki, but for now here's the disassembled code listing. This is the function that takes the raw MAP sensor AD values from the ring buffer and calculates MAP pressure and manifold vacuum pressure.
It really would be very nice to have the actual parameter/variable names, but you'll have to suffer through my made up names (identified as all lowercase) :-)
Key things of note:
- The code loops through the ring buffer every time it runs and pulls and averages a number of valid samples (by default it's actually only 1 valid value that it samples).
- It then takes the raw value and offsets it and scales it according to the MAP scaler and offset parameters that have been known for some time.
- Manifold vacuum pressure is calculated as P_UMG (ambient pressure from the on-DME pressure sensor) minus MAP pressure.
- The function runs in both the segment task and the 10ms task.
It really would be very nice to have the actual parameter/variable names, but you'll have to suffer through my made up names (identified as all lowercase) :-)
Key things of note:
- The code loops through the ring buffer every time it runs and pulls and averages a number of valid samples (by default it's actually only 1 valid value that it samples).
- It then takes the raw value and offsets it and scales it according to the MAP scaler and offset parameters that have been known for some time.
- Manifold vacuum pressure is calculated as P_UMG (ambient pressure from the on-DME pressure sensor) minus MAP pressure.
- The function runs in both the segment task and the 10ms task.
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