Bus voltage acquisition

[Cedd]

Hello everybody,

I would like to know when the VBUS voltage measurement is updated. I am using the functions to read the voltage:

VBS_GetBusVoltage_d
VBS_GetAvBusVoltage_V

I am using the threads startMediumFrequencyTask, StartSafetyTask, and my own thread.

At system startup, I want to load a buffer. But the measurements taken are incorrect or zero at the board startup.

Is there any documentation on the acquisitions?

MCSDK : 6.4.1

Best regards.

[STuser2]

Which MCSDK version you are using there are some differences in 6.4.0 compared to previous versions for acquiring the regular channels ADC data.

[Cedd]

Might be a bug in the library...

I do see the variable AvBusVoltage_d increasing over time, but LatestConv always stays at 0.

[GMA · Accepted solution]

Hello @Cedd,

The raw VBUS value is obtained at the medium-frequency task in mc_tasks.c:

    uint16_t rawValueM1 =  RCM_GetRegularConv(&VbusRegConv_M1);
    CodeReturn |= errMask[bMotor] & RVBS_CalcAvVbus(&BusVoltageSensor_M1, rawValueM1);

The latest conversion is then available in VbusRegConv_M1.data.

[Cedd]

Hello GMA,

Thanks for this answer, it's all good.