ISL94202: Auto-detect number of cells

[martinjaeger]

The number of cells is currently still hard-coded and set in bms_init_hardware() in bms_isl94202.c.

The ISL94202 does not automatically detect the number of cells. It has to be written to a register.

Possible algorithm:

• Start with 8 cells enabled.
• Measure voltages and find out actual number of cells (including plausibility-check with pack voltage)
• Set number of cells in chip.

[case06]

In Dacians SBMS it also has to be set manually by configs. I wonder if there is any risk for a constellation with e.g. a constellation of unusual low unloaded cells that could perhaps lead to a missinterpretation and wrong celltype-classification ?

[martinjaeger]

Mhh, true, that could be an issue. But if a cell is below e.g. 1V the pack should not be used anyway anymore...

Today I realized that the default setting of the chip is actually 3 cells, so the algorithm should start from there.