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大家好，看到這個(gè)例程不太明白，這個(gè)例程是如何定義P10是ADC采集口？僅靠IO口的設(shè)定？這個(gè)例程官網(wǎng)上的。
單片機(jī)源程序如下:
- #include "reg51.h"
- #include "intrins.h"
- sfr ADC_CONTR = 0xbc;
- sfr ADC_RES = 0xbd;
- sfr ADC_RESL = 0xbe;
- sfr ADCCFG = 0xde;
- sfr P_SW2 = 0xba;
- #define ADCTIM (*(unsigned char volatile xdata *)0xfea8)
- sbit EADC = IE^5;
- sfr P0M1 = 0x93;
- sfr P0M0 = 0x94;
- sfr P1M1 = 0x91;
- sfr P1M0 = 0x92;
- sfr P2M1 = 0x95;
- sfr P2M0 = 0x96;
- sfr P3M1 = 0xb1;
- sfr P3M0 = 0xb2;
- sfr P4M1 = 0xb3;
- sfr P4M0 = 0xb4;
- sfr P5M1 = 0xc9;
- sfr P5M0 = 0xca;
- void ADC_Isr() interrupt 5
- {
- ADC_CONTR &= ~0x20; //清中斷標(biāo)志
- P2 = ADC_RES; //讀取ADC結(jié)果
- ADC_CONTR |= 0x40; //繼續(xù)AD轉(zhuǎn)換
- }
- void main()
- {
- P0M0 = 0x00;
- P0M1 = 0x00;
- P1M0 = 0x00;
- P1M1 = 0x00;
- P2M0 = 0x00;
- P2M1 = 0x00;
- P3M0 = 0x00;
- P3M1 = 0x00;
- P4M0 = 0x00;
- P4M1 = 0x00;
- P5M0 = 0x00;
- P5M1 = 0x00;
- P1M0 = 0x00; //設(shè)置P1.0為ADC口
- P1M1 = 0x01;
- P_SW2 |= 0x80;
- ADCTIM = 0x3f; //設(shè)置ADC內(nèi)部時(shí)序
- P_SW2 &= 0x7f;
- ADCCFG = 0x0f; //設(shè)置ADC時(shí)鐘為系統(tǒng)時(shí)鐘/2/16
- ADC_CONTR = 0x80; //使能ADC模塊
- EADC = 1; //使能ADC中斷
- EA = 1;
- ADC_CONTR |= 0x40; //啟動(dòng)AD轉(zhuǎn)換
- while (1);
- }
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