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SparkFun LiPo Fuel Gauge Interfacing Issues

Andrew Butler
Expert 2520 points

I am trying to interface the SparkFun LiPo Fuel Gauge (www.sparkfun.com/.../10617) to my F28069 Launchpad and I am having trouble reading the 16-bit SOC result calculated by ModelGauge algorithm. I have copied and pasted my code and attached a screenshot of my I2C bus below.

unsigned char FuelGaugeMSB = 0;
unsigned char FuelGaugeLSB = 0;

I2caRegs.I2CSAR = 0x36; //0x6C, Write MAX
I2caRegs.I2CCNT = 1;
I2caRegs.I2CDXR = 0x04; //0x04, SOC Register
I2caRegs.I2CMDR.all = 0x2620;
while(!I2caRegs.I2CSTR.bit.ARDY);

I2caRegs.I2CCNT = 1;
I2caRegs.I2CMDR.all = 0x2C20;


while(!I2caRegs.I2CSTR.bit.RRDY);
FuelGaugeMSB = I2caRegs.I2CDRR;


while(!I2caRegs.I2CSTR.bit.RRDY);
FuelGaugeLSB = I2caRegs.I2CDRR;


return FuelGaugeMSB;