RL78 -[10]- CS+_CACX_Lab4_ADC_內部參考電壓

RL78內部有一LDO可以產生1.45v的內部參考電壓

可以幫助使用者在做外部電壓量測前先做參考電壓校正

1. Code Generator (Design Tool)

A/D Converter > A/D convertor operation setting : Used

Resolution setting : 10 bits

A/D channel selection : Internal reference voltage output

2. Procedure Modify

在main.c加入全域變數

1 2	uint16_t adcValue[1]; double refVol;// adc refer voltage

main()

啟動ADC function

1 2	R_ADC_Set_OperationOn(); R_ADC_Start();

r_cg_adc_user.c

1	#include <math.h>

1.45v = ReferVoltage * ( ADC_value / 2^10 )

ReferVoltage = ( 1.45v * 2^10 ) / ADC_value

1 2 3 4 5 6 7 8

extern uint16_t adcValue[1]; extern double refVol; double ref145; ref145 = pow(2,10) * 1.45;// 2^7 * 1.45 R_ADC_Get_Result(adcValue); refVol = ref145 / (double)adcValue[0];

3. Build & Download