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Sample code for the MAX17055 Fuel Gauge with EZ config Initialization API implemented. The MAX17055 is part of the MAX32620FTHR
Dependencies: MAX17055_EZconfig
main.cpp
- Committer:
- fneirab
- Date:
- 2019-02-07
- Revision:
- 0:bec440cb42e5
File content as of revision 0:bec440cb42e5:
#include "mbed.h" #include "max17055.h" //LED indication DigitalOut rled(LED1); //I2C communications I2C i2cBus(P5_7, P6_0); //Fuel Gauge MAX17055 fuelGauge(i2cBus); MAX17055::platform_data design_param; MAX17055::saved_FG_params_t saved_param; //MAX77650 PMIC #define POWER_HOLD_ON 1 #define POWER_HOLD_OFF 0 DigitalOut pw_Hold(P2_2, POWER_HOLD_ON); //To enable battery operation from the PMIC //Battery Parameters Storage from the Fuel Gauge MAX17055 union max17055_u { struct battery { uint8_t avg_soc_FG; // in Battery Percent float tte_FG; // in seconds float ttf_FG; // in seconds int avg_vcell_FG; // in 78.125uV per bit float avg_curr_FG; // in uAmps float curr_FG; // in uAmps int rep_cap; // in mAh int rep_SOC; // in % } battery; } max17055_u; int main(void) { rled = true; //These are the calculated parameters for rsense 5mOhm found in the MAX32620FTHR and a 350mAh Li+ Cell. design_param.designcap = 0x015E; //Design Battery Capacity mAh thic can change depending on the batteries implemented see battery data sheet for details. design_param.ichgterm = 0x0070; // Charge Termination Current for the Battery This is specified by the manufacturer. design_param.vempty = 0x9600; // 3V Battery Empty Voltage This is sepecified by design, but manufacturer has a min Empy voltage specification. design_param.vcharge = 4200; // 4.2V Battery Charge Voltage can be obtained from MAX77650 configuration design_param.rsense = 5; //5mOhms for MAX32620, keep in mind the MAX17055EVKIT has a 10mOhm resistor. This is a design specific value. Used Rsense for resgiter calculation results. //Saved Parameters //saved_param.cycles = 0; //This value is used for the save parameters function. int status; // stores return value of the status of setting up the MAX17055 MAX17055::Registers_e array_addresses[7] = {MAX17055::MODELCFG_REG, MAX17055::DESIGNCAP_REG, MAX17055::FULLCAPNOM_REG, MAX17055::DPACC_REG, MAX17055::DQACC_REG, MAX17055::VEMPTY_REG, MAX17055::ICHGTERM_REG }; status = fuelGauge.init(design_param); printf("Init FuelGauge Function Status= %X \r\n",status); // Status shoudl retun Zero if the are no issues with the initialization. if (status == 0) fuelGauge.save_Params(saved_param); //Read DesignCap, Ichagterm, Vempty, dqacc, dpacc, MODELCFG, FullCapNom to verify values correspond to the expected stored Values. // FullCapNom[mAh] = (dqacc[mAh]/dpacc[%])*100% uint16_t regValue[7]; for(int i = 0 ; i < 7 ; i++) { regValue[i] = fuelGauge.get_regInfo(array_addresses[i]); printf("%X" ,regValue[i]); printf(" "); } rled = false; wait(2); while (1) { //This code is an example to ilustrate the performance or the Fuel Gauge. This can change with the design requirements. Use this as a way to troubleshoot the FuelGauge. rled = !rled; max17055_u.battery.avg_vcell_FG = fuelGauge.get_avgVcell(); max17055_u.battery.avg_curr_FG = fuelGauge.get_AvgCurrent(design_param); max17055_u.battery.curr_FG = fuelGauge.get_Current(design_param); max17055_u.battery.rep_cap = fuelGauge.get_battCAP(design_param); max17055_u.battery.rep_SOC = fuelGauge.get_SOC(); //This code should work with Arduino Serial Plotter to visualize data printf("%f " ,(max17055_u.battery.avg_vcell_FG/1000000.0)); //V printf("%f " ,max17055_u.battery.avg_curr_FG); //uA printf("%f " ,max17055_u.battery.curr_FG); //uA printf("%d " ,max17055_u.battery.rep_cap); //mAh printf("%d " ,max17055_u.battery.rep_SOC); //% printf("\n"); wait(1); } }