stc12C5A60S2内部AD应用.docx

1、stc12C5A60S2内部AD应用系统说明：本人想用STC12C5A60S2自带的A/D对电源电压进行检测（暂定3.3V），晶振：12M，电压从P1.0口输入，检测后的电压值在1602上进行显示，附上硬件大致原理图，硬件部分是照STC12C5A60S2芯片资料上设计，大家看看有错没？硬件原理简图 (原文件名:clip_image001.gif) 程序的A/D部分也是从官网资料上搬下来的，只自己稍微改了一下对读取到的A/D转换结果的数据处理，液晶部分是前阵子写的搬过来的。大家帮我看看哪出问题了？程序如下：#include#include intrins.h#define uchar unsig

2、ned char #define uint unsigned intuchar Vo; /A/D转换后换算的电压值/*Declare SFR associated with the ADC */sfr ADC_CONTR = 0xBC; /ADC control registersfr ADC_RES = 0xBD; /ADC high 8-bit result registersfr ADC_RESL = 0xBE; /sfr ADC_LOW2 = 0xBE; /ADC low 2-bit result register sfr P1ASF = 0x9D; /P1 secondary fun

3、ction control register /*Define ADC operation const for ADC_CONTR*/#define ADC_POWER 0x80 /ADC power control bit#define ADC_FLAG 0x10 /ADC complete flag 模数转换结束标志位#define ADC_START 0x08 /ADC start control bit 模数转换启动控制位/转换速度控制位SPEED0和SPEED1，共四种状态，对应四种转换速度#define ADC_SPEEDLL 0x00 /540 clocks #define AD

4、C_SPEEDL0x20 /360 clocks#define ADC_SPEEDH0x40 /180 clocks#define ADC_SPEEDHH 0x60 /90 clocksuchar tCount;sbit RS = P04;sbit RW = P05;sbit EN = P06;void DelayMS(uint ms)uint i;while(ms-) for(i=0;i120;i+);/*-Software delay function-*/void Delay(uint n) uint x; while (n-) x = 5000; while (x-); /*-Init

5、ial ADC sfr-*/void InitADC() P1ASF = 0x01; /选择P1.0作为A/D输入通道 ADC_RES = 0; /清0 ADC_CONTR = ADC_POWER | ADC_SPEEDLL; /0x10|0x00=0x10:开电源和设置A/D转换速度 Delay(2); /ADC power-on and delay/*-Get ADC result-*/uchar GetADCResult(uchar ch) ADC_CONTR = ADC_POWER | ADC_SPEEDLL | ch | ADC_START;/0x00|0x00|ch|0x08:选择

6、A/D输入通道，开始A/D转换 _nop_(); /Must wait before inquiry ， _nop_(); /设置ADC_CONTR寄存器后需加4个CPU时钟周期的延时，才能保证值被写入ADC_CONTR寄存器 _nop_(); _nop_(); while (!(ADC_CONTR & ADC_FLAG);/Wait complete flag ADC_CONTR &= ADC_FLAG; /Close ADC Vo=ADC_RES*5*10/256; /Return ADC result（为显示整数，这里将电压值扩大了十倍） return Vo;uchar Read_LCD

7、_State() uchar state; RS=0; RW=1; EN=1; DelayMS(1); state=P2; EN = 0; DelayMS(1); return state; void LCD_Busy_Wait() while(Read_LCD_State()&0x80)=0x80); DelayMS(5);void Write_LCD_Data(uchar dat) /写数据到1602 LCD_Busy_Wait(); RS=1; RW=0; EN=0; P2=dat; EN=1; DelayMS(1); EN=0; void Write_LCD_Command(uchar

8、 cmd) /写命令 LCD_Busy_Wait(); RS=0; RW=0; EN=0; P2=cmd; EN=1; DelayMS(1); EN=0; void Init_LCD() /1602初始化 Write_LCD_Command(0x38); DelayMS(1); Write_LCD_Command(0x01); /清屏 DelayMS(1); Write_LCD_Command(0x06); / DelayMS(1); Write_LCD_Command(0x0c); DelayMS(1); void Set_LCD_POS(uchar p) Write_LCD_Command

9、(p|0x80); void Display_LCD_String(uchar p,uchar *s) /1602显示 uchar i; Set_LCD_POS(p); for(i=0;i16;i+) Write_LCD_Data(s); DelayMS(1); void Format_DateTime(uchar d,uchar *a) a0=d/10+0; a1=d%10+0;/写入液晶第二行void display(uchar add,uchar date) uchar shi,ge; shi=date/10+0; ge=date%10+0; Write_LCD_Command(0x80

10、+0x40+add); Write_LCD_Data(shi); Write_LCD_Data(ge);/写入液晶第一行void display1(uchar add,uchar date) uchar shi,ge; shi=date/10; ge=date%10; Write_LCD_Command(0x80+add); Write_LCD_Data(0x30+shi);/0x30即48（十进制）对应的ASCAII码为字符0 Write_LCD_Data(0x30+ge);void main() Init_LCD(); InitADC(); while (1) GetADCResult(0); Display_LCD_String(0,dianya:); display1(7,Vo); Display_LCD_String(9,V ); DelayMS(1000); 程序二：* 文件名：AD_CAIYANG.C* 功能：使用AD采