Hello I need help analyzing this code please:

here is the code

#include #include #include "inc/hw_memmap.h" #include "inc/hw_types.h" #include "driverlib/debug.h" #include "driverlib/sysctl.h" #include "driverlib/adc.h"

int main(void) { uint32_t ui32ADC0Value[4]; volatile uint32_t ui32TempAvg; volatile uint32_t ui32TempValueC; volatile uint32_t ui32TempValueF;

SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_OSC_MAIN|SYSCTL_XTAL_16MHZ); SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);

ADCSequenceConfigure(ADC0_BASE, 1, ADC_TRIGGER_PROCESSOR, 0); ADCSequenceStepConfigure(ADC0_BASE, 1, 0, ADC_CTL_TS); ADCSequenceStepConfigure(ADC0_BASE, 1, 1, ADC_CTL_TS); ADCSequenceStepConfigure(ADC0_BASE, 1, 2, ADC_CTL_TS); ADCSequenceStepConfigure(ADC0_BASE,1,3,ADC_CTL_TS|ADC_CTL_IE|ADC_CTL_END);

ADCSequenceEnable(ADC0_BASE, 1); while(1) { ADCIntClear(ADC0_BASE,1); ADCProcessorTrigger(ADC0_BASE, 1); while(!ADCIntStatus(ADC0_BASE, 1, false)) {}

ADCSequenceDataGet(ADC0_BASE, 1, ui32ADC0Value); ui32TempAvg = (ui32ADC0Value[0] + ui32ADC0Value[1] + ui32ADC0Value[2] + ui32ADC0Value[3] + 2)/4; ui32TempValueC = (1475 - ((2475 * ui32TempAvg)) / 4096)/10; //Conversion to Celsius ui32TempValueF = ((ui32TempValueC * 9) + 160) / 5;

} }

my questions are:

1) In a line where you average out number of the read temperature samples, why you are adding a value 2 to the sum before dividing it by 4?

2) How you program equation for converting raw temperature reading to physical temperature in is different from theoretical equation ( Temp C=147.5-[(V_REFP-V_REFN )*ADC_VALUE ]/4096 ) provided by your microcontroller manufacturer? why?