初学STC8A单片机,ADC转换用P10通道,无检测结果。接3.3V测试电压,ADC_RES输出为0;请指教!
程序如下:
- #include "stc8.h"
- #define uchar unsigned char
- unsigned char const z[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x80};//7段数码管段码表共阳0,1,2,3,4,5,6,7,8,9,.
- unsigned char code c[]={0x08,0x10,0x20,0x40};//数码管扫描
- unsigned char smgduan[4]={0x3f,0x80,0x3f,0x3e};
- sbit LSA=P0^0;
- sbit LSB=P0^1;
- sbit LSC=P0^2;
- int e;
- void smg(void)
- {
- unsigned char i;
- while(1)
- {
- for(i=0;i<4;i++)
- {
- switch(i)
- {
- case(0):
- LSA=0;LSB=0;LSC=0; break;//???0?
- case(1):
- LSA=1;LSB=0;LSC=0; break;//???1?
- case(2):
- LSA=0;LSB=1;LSC=0; break;//???2?
- case(3):
- LSA=1;LSB=1;LSC=0; break;//???3?
- }
-
- P2=smgduan[i]
- delay(100);
- P2=0x00;
- }
- }}
- uint GetADCResult()
- {
- ADC_CONTR = ADC_POWER|ADC_START;
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- ADC_RES=0;
- while(!(ADC_CONTR & 0x20));
- ADC_CONTR &= ~ADC_FLAG;
- return (ADC_RES*4+ADC_RESL);
- }
- void main(void)
- {
- uint V;
- P1M0 = 0X00;
- P1M1 = 0X00;
- ADC_CONTR=0x80;
- ADCCFG=0x00;
- ADC_RES=0;
- ADC_RESL=0;
- while(1)
- {
- V=GetADCResult()*10;
- smgduan[0]=z[V/10];
- smgduan[2]=z[V%10];
- smg();
- }
- }
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