adc.c

来自「以C8051F330为核心,开发单端正激型开关电源充电器,C8051F330负责」· C语言 代码 · 共 51 行

#include "switch_power.h"





void ADC0_Initial(void)
{
    AMX0N = 0x11;//operates in single-ended mode
    ADC0CF = 0x78;//bit7--bit3 set AD0SC 11111 ,bit 2 set 0 means right-justified
	ADC0CN = 0xc0;//bit 7 set 1 enable ADC0
	              //bit 6 set 0 means normal track mode, set 1 means low-power track-and-hold mod
				  //bit 5 conversion complete interrupt flag
				  //bit 4 busy bit
				  //bit 3 windows compare interrupt flag
				  //bit 2--0 start of conversion mode ,000 means write 1 to AD0BUSY
}

/************************************************
*        I*R3*1024/Vref = CurrentNum            *
************************************************/
void ADC0_Current(void)
{
    AMX0P = 0x0C;

    AD0INT = 0;
    AD0BUSY = 1;
	while(AD0INT == 0);

    CurrentNum = ADC0H;
	CurrentNum <<= 8;
	CurrentNum += ADC0L;
}

/***************************************************************************************
*        U*R2*1024/(R1*Vref + R2*Vref) = VoltageNum - CurrentNum*R2/(R1+R2)            *
***************************************************************************************/
void ADC0_Voltage(void)
{
    AMX0P = 0x0D;

    AD0INT = 0;
    AD0BUSY = 1;
	while(AD0INT == 0);

    VoltageNum = ADC0H;
	VoltageNum <<= 8;
	VoltageNum += ADC0L;

	VoltageNum = VoltageNum - CurrentNum/20;
}