8316 A/D采样的例子，加delay(1)是因为I/O速度慢的缘故。参看说明书关于寄存器的描述一起看。 _ACL8316_AD(int ad_ch,int ad_gain) {int Gain,DRTY,ad_data; outportb(BASE+10,ad_ch); delay(1); outportb(BASE+8,0x00); delay(1); outportb(BASE+12,0x00); delay(1); inportb(BASE+12); switch(Gain) { case 1: ad_gain=0; break; case 2: ad_gain=1; break; case 4: ad_gain=2; break; case 8: ad_gain=3; break; } outportb(BASE+9,ad_gain); delay(1); do {DRTY=inportb(BASE+8)&0x80; delay(1);} while(DRTY==0); ad_data=inport(BASE+4); return ad_data; }