今天在調(diào)STC12的AD功能時發(fā)現(xiàn)一個問題，我從P1.0到P1.6一個一個試過去，但到P1.7的時候就問題了，雖然P1.0到P1.6精度不高，但用P1.7口時，數(shù)碼管一直顯示4.9， 我一直找不到問題所在，求大神幫幫忙，我改的只有黑體字。。
單片機程序如下:
- #include "reg51.h"
- #include "intrins.h"
- typedef unsigned char uchar;
- typedef unsigned int uint;
- float temp,v;
- /*Declare SFR associated with the ADC */
- sfr ADC_CONTR = 0xBC; //ADC control register
- sfr ADC_RES = 0xBD; //ADC hight 8-bit result register
- sfr ADC_LOW2 = 0xBE; //ADC low 2-bit result register
- sfr P1ASF = 0x9D; //P1 secondary function contr ol register
- sbit Max7219_pinCLK = P2^2;
- sbit Max7219_pinCS = P2^1;
- sbit Max7219_pinDIN = P2^0;
- uchar ge ,shi, bai;
- uchar code shuzi[]={0x7e,0x30,0x6d,0x79,0x33,0x5b,0x5f,0x70,0x7f,0x7b};
- /*Define ADC operation const for ADC_CONTR*/
- #define ADC_POWER 0x80 //ADC power control bit
- #define ADC_FLAG 0x10 //ADC complete flag
- #define ADC_START 0x08 //ADC start control bit
- #define ADC_SPEEDLL 0x00 //540 clocks
- #define ADC_CHS 0x07; // AD通道選擇 （P1.0 - 0X01， P1.1 - 0X02 .... P1.6 - 0x06 ）， 到P1.7就有問題了。。。
- void delay(uint n);
- void InitADC();
- void Dispaly();
- void Write_Max7219_byte(uchar DATA)
- {
- uchar i;
- Max7219_pinCS=0;
- for(i=8;i>=1;i--)
- {
- Max7219_pinCLK=0;
- Max7219_pinDIN=DATA&0x80;
- DATA=DATA<<1;
- Max7219_pinCLK=1;
- }
- }
- void Write_Max7219(uchar address,uchar dat)
- {
- Max7219_pinCS=0;
- Write_Max7219_byte(address); //寫入地址，即數(shù)碼管編號
- Write_Max7219_byte(dat); //寫入數(shù)據(jù)，即數(shù)碼管顯示數(shù)字
- Max7219_pinCS=1;
- }
- void Init_MAX7219(void)
- {
- Write_Max7219(0x09, 0x00); //譯碼方式：BCD碼
- Write_Max7219(0x0a, 0x05); //亮度
- Write_Max7219(0x0b, 0x07); //掃描界限；8個數(shù)碼管顯示
- Write_Max7219(0x0c, 0x01); //掉電模式：0，普通模式：1
- Write_Max7219(0x0f, 0x00); //顯示測試：1；測試結(jié)束，正常顯示：0
- }
- void voltage_display()
- { uchar u;
- u = v;
- ge = u%10;
- shi = (u%100)/10;
- bai = (u%1000)/100;
- Write_Max7219(1,0x01);
- Write_Max7219(2,0x01);
- Write_Max7219(3,shuzi[ge]);
- Write_Max7219(4,shuzi[shi]);
- Write_Max7219(5,shuzi[bai]);
- Write_Max7219(6,0x01);
- Write_Max7219(7,0x01);
- Write_Max7219(8,0x01);
- }
- void main()
- {
- Init_MAX7219();
- InitADC(); //Init ADC sfr
- IE = 0xa0; //Enable ADC interrupt and Open master interrupt switch //Start A/D conversion
- while (1)
- {
- voltage_display();
- }
- }
- /*---------------------------- ADC interrupt service routine ----------------------------*/
- void adc_isr() interrupt 5 using 1
- {
- ADC_CONTR &= !ADC_FLAG; //Clear ADC interrupt flag
- temp = ADC_RES;
- v = temp*0.1/256*500;
- ADC_CONTR = ADC_POWER | ADC_SPEEDLL | ADC_START | ADC_CHS;
- }
- /*---------------------------- Initial ADC sfr ----------------------------*/
- void InitADC( )
- { P1ASF = 0X80; //Set P1.7 as analog input port
- // P1.0 - 0X01 P1.1 - 0X02
- // P1.2 - 0X04 P1.3 - 0X08
- // P1.4 - 0X10 P1.5 - 0X20
- // P1.6 - 0X40
- ADC_RES = 0; //Clear previous result
- ADC_CONTR = ADC_POWER | ADC_SPEEDLL | ADC_START | ADC_CHS;
- delay(2); //ADC power-on delay and Sta rt A/D conversion
- }
- /*---------------------------- Software delay function ----------------------------*/
- void delay(uint n)
- { uint x;
- while (n--)
- { x = 5000;
- while (x--);
- }
-
- }
|
QQ好友和群
QQ空間
騰訊微博
騰訊朋友
收藏
淘帖
頂
踩
