oxidecomputer / oxidecomputer/hubris
Sidecar fan current scaling incorrect
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- Dominant language
- Rust
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- Merged PRs (30d)
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Description
Not sure if this is a hubris or humility issue, but the ADM1272 current measurements on the fans for Sidecar have the incorrect scaling. They are reporting a current that is 2x the actual current.
From humility sensors:
NAME KIND VALUE UNPWR ERR MSSNG UNAVL TMOUT
V54_FAN1 current 5.97 0 0 0 0 0
Actual current is 3.0A on an external electronic load. The current sense resistor on the fan HSCs is 2 milliohms but the main HSC is 1 milliohm.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start from the humility sensors entry point and locate the Sidecar ADM1272 fan current-scaling configuration. Compare the 2 milliohm fan HSC sense resistor with the 1 milliohm main HSC value; done means the reported fan current matches the external electronic-load measurement.
Written by the indexing model from the issue text.
Assessment
- Domain
- embedded-iot
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100