ad.c

下位机程序

//AD初始化，读AD,2008.4.20,cg
#include "myapp.h"
#define   ADC_time 1000000
unsigned char AD_channel=0;
void AD_init(unsigned char ch)
{
    unsigned int i;
    rADCCON=(1<<14)|((int)((sys_pclk/5./ADC_time)-1)<<6)|(ch<<3);
    for(i=0;i<500;i++);
}
unsigned short read_AD(void)
{
    rADCCON=rADCCON|0x1;//start AD
    while(!(rADCCON&0x8000));
    return ((unsigned short)(rADCDAT0&0x3ff));
}