Battery Management Unit variables (changes)
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Programmer's Reference Manuals
» PortablePart 15 – SWI Calls
» Battery Management Unit variablesPortable
» Battery Management Unit Variables
Battery Management Unit Variables
Variables
Variables shown with a grey background are deprecated, and their use should be avoided. 4
| # | Description | Units |
|---|---|---|
| 0 | Version number and memory map of BMU microcode | |
| 1 | Battery capacity (nominal) | mAh 1 |
| 2 | Battery capacity (measured) | mAh 1 |
| 3 | Battery capacity (used) | mAh 1 |
| 4 | Battery capacity (useable) | mAh 1 |
| 5 | (reserved) | |
| 6 | Charge estimate (may be written to) | mAh 1 |
| 7 | Instantaneous voltage | mV 2 |
| 8 | Instantaneous current | mA 3 |
| 9 | Instantaneous temperature | 0.1K 2 |
| 10 | Status flags | |
| 11 | Charge rate (in bits 4 – 7) | |
| 12 | Charge current | |
| 13 | Discharge current | |
| 14 | Voltage | |
| 15 | Temperature 1 | |
| 16 | Temperature 2 | |
| 17 | Charge level | |
| 18 | Status flags (as variable 10) | |
| 19 | Input signals | |
| 20 | Battery capacity | |
| 21 | Battery time remaining | Seconds |
| 22 | Max battery life | Seconds |
| 23 | Battery percentage remaining | 0-100 |
| 24 | Charge time remaining | Seconds |
| 25 | Charge cycle count | |
| 26 | Smoothed voltage | mV |
| 27 | Smoothed current | mA |
| 28 | Nominal available capacity | mAh |
| 29 | Compensated available capacity | mAh |
Notes
Not all BMU variables or flags are available in all variants of the module. See the Portable Feature Matrix for more details (BMU variables, flags). Portable_EnumerateBMU can (where supported) also be used to read the available flags.
1 Units are 11.7mAh in the A4 version of the Portable module
2 Units are unknown in the A4 version of the Portable module
3 Units are 10.3mA in the A4 version of the Portable module
4 The variables shown with a grey background are deprecated, for the following reasons:
- They correspond to the variables that were introduced with the Stork version of the Portable module
- Apart from variable 14 being supported by the A9 version of the module, it’s only the Stork version of the module that supports them
- The Stork version of the module has never been available in an official stable release of the OS
- There is limited documentation about the function or measurement units of the variables
- Many of the variables appear to duplicate the intent or function of A4 variables
See also
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