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Each group of 6 cells is connected to a battery monitoring circuit (shortened as BMC later).

This circuit measures:

The voltage of each cell
The current delivered by the group
- This is done by forcing the battery to deliver current through a resistor with a tiny resistance. This resistor, called a shunt/shunt resistor, follows Ohm’s law: V=IR
- This implies that I=V/R, which means that the current passing through a shunt is equal to its voltage (which can be measured easily), divided by its resistance (which is a known constant).

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Info

The ports we are interested in:

PA9: SCL_1, Serial Clock line for I²C 1, to configure BMC 1
PA10: SDA_1, Serial Data line for I²C 1, to configure BMC 1
PA7: SCL_2, Serial Clock line for I²C 2, to configure BMC 2
PB4: SDA_2, Serial Data line for I²C 2, to configure BMC 2
PA12: CAN_TX, Transmit line for CAN
PA11: CAN_RX, Receive line for CAN
PA3: OVERCURRENT, receives 5.5 V when an overcurrent occurs, and 0 V otherwise

Speculated ports:

PA5: VCOUT1_FILT, receives 1.47-1.53 V (REF_SEL=0) / 2.94-3.06 V (REF_SEL=1), representing the cell voltages for cells 1-6
PB0: ADC1_FILT, receives 0.25-1.25 V (REF_SEL=0) / 0.5-2.5 V (REF_SEL=1), representing the cell current for cells 1-6, as measured by a 1-milliohm shunt
PB1: VCOUT2_FILT, receives 1.47-1.53 V (REF_SEL=0) / 2.94-3.06 V (REF_SEL=1), representing the cell voltages for cells 7-12
PA2: ADC2_FILT, receives 0.25-1.25 V (REF_SEL=0) / 0.5-2.5 V (REF_SEL=1), representing the cell current for cells 7-12, as measured by a 1-milliohm shunt

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What is REF_SEL set to for the battery monitoring boards?
Are our speculated ports correct?Why are we reading the battery and voltage information via both I²C and analogue pins?
How should the MCU beacon itself to the FC (i.e. so that the FC is aware that the MCU on the power module is there)?
What should be sent over CAN?

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