RL78 -[11]- CS+_CACX_Lab4_ADC_溫度感測

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RL78/G13內建溫度感測器

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termerature sensor在 +25度時的電壓為1.05V

溫度每升高1度, 電壓降 3.6mV

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此次測試會基于上一篇實驗接續 RL78 -[10]- CS+_CACX_Lab4_ADC_內部參考電壓


暫存器ADS可以切換ADC input channel

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1. Procedure Modify

main.c 全域變數宣告

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uint16_t adcValue[4];
double refVol;// adc refer voltage
float temp;
uint8_t step = 0;// 0:internal 1:temperature


main()

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    R_ADC_Set_OperationOn();
    R_ADC_Start();


r_cg_adc_user.c

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#include <math.h>


r_adc_interrupt()

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    extern uint16_t adcValue[4];
    extern double refVol;
    extern uint8_t step;
    extern float temp;
    double ref145;
    double tempVoltage,i2,i3;
    
    ref145 = pow(2,10) * 1.45;// 2^7 * 1.45    
    R_ADC_Get_Result((adcValue+step));    
    refVol = ref145 / (double)adcValue[0];    
    tempVoltage = refVol * adcValue[1] / 1024;
    if(tempVoltage > 1.05){
	i2 = tempVoltage - 1.05;
	i3 = i2 / 0.0036;
	temp = 25 - i3;
    }else if(tempVoltage < 1.05){
    	i2 = 1.05 - tempVoltage;
    	i3 = i2 / 0.0036;
    	temp = 25 + i3;	    
    }
    
    if( step == 0){
    	step = 1;
	ADS = _80_AD_INPUT_TEMPERSENSOR_0;
    }
    else{
    	step = 0;
	ADS = _81_AD_INPUT_INTERREFVOLT;
    }

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