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#include "S3C2451_adc.h"

//#define ADCCON (*(volatile unsigned *)0x58000000)
//#define ADCTSC (*(volatile unsigned *)0x58000004)
//#define ADCDLY (*(volatile unsigned *)0x58000008)
//#define ADCDAT0 (*(volatile unsigned *)0x5800000c)
//#define ADCDAT1 (*(volatile unsigned *)0x58000010)
//#define ADCUPDN (*(volatile unsigned *)0x58000014)
//#define ADCMUX (*(volatile unsigned *)0x58000018)

// 使用查询方式读取A/D转换值
int read_adc(int resolution)
{
// 使能预分频功能，设置A/D转换器的时钟 = PCLK/(65+1)
rADCCON = (1<<16)|(1 << 14) | (65 << 6) | (resolution << 3);

// 清除位[2]，设为普通转换模式,禁止read start
rADCCON &= ~((1<<2)|(1<<1));

// 设置位[0]为1，启动A/D转换
rADCCON |= (1 << 0);

// 当A/D转换真正开始时，位[0]会自动清0
while (rADCCON & (1 << 0));

// 检测位[15]，当它为1时表示转换结束
while (!(rADCCON & (1 << 15)) );

// 读取数据
return (rADCDAT0 & 0xfff);
}

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