原创 查询法 ARM中的adc

#include "AT91SAM7S256.h"

#include "Board.h"

volatile unsigned int EXT_AD_Val[4];

int main(void)

{

unsigned char i;

*AT91C_ADC_CR = AT91C_CKGR_MOSCEN;                //ADC的软件复位,即清除ADC的所有寄存器

*AT91C_PMC_PCER = 1 << AT91C_ID_ADC;        //使能ADC时钟

*AT91C_PIOA_PDR = EXT_AD0 | EXT_AD1;        //禁止该两个管脚的I/O口功能,使作为模拟输入功能

*AT91C_ADC_MR   = 0x0f1f3f00;                        //软件起动,10位分辨率,128分频

*AT91C_ADC_CHER = 0x33;                                        //使能通道0,1,4,5

*AT91C_ADC_CHDR = 0xcc;                                        //禁能通道2,3,6,7

*AT91C_ADC_IDR  = 0xfffff;                                //禁止所有中断

while (1)

{

*AT91C_ADC_CR = 0x2;                                //起动转换

while(1)

{

if ((*AT91C_ADC_SR) & 0x33)

{

EXT_AD_Val[0] = (*AT91C_ADC_CDR0) & 0x3ff;

EXT_AD_Val[1] = (*AT91C_ADC_CDR1) & 0x3ff;吧

EXT_AD_Val[2] = (*AT91C_ADC_CDR4) & 0x3ff;

EXT_AD_Val[3] = (*AT91C_ADC_CDR5) & 0x3ff;

for (i = 0; i < 4; i++)

{

EXT_AD_Val = (EXT_AD_Val * 3300) / 1023;