C51 COMPILER V7.05   PCF8591AD                                                             02/16/2006 21:21:51 PAGE 1   


C51 COMPILER V7.05, COMPILATION OF MODULE PCF8591AD
OBJECT MODULE PLACED IN PCF8591AD.OBJ
COMPILER INVOKED BY: C:\SiLabs\MCU\IDEfiles\C51\BIN\C51.exe PCF8591AD.C DB OE

stmt level    source

   1          //參考程序A: PCF8591AD.C  PCF8591的AD轉(zhuǎn)換實(shí)驗(yàn).
   2          /*芯片PCF8951共有四個(gè)A/D輸入通道：AD0，AD1，AD2，AD3,分別與四個(gè)電位器(R1,R2,R3,R4)連接，用以調(diào)節(jié)電位器的輸
             -出電壓。其中AD0通道既可測量電位器輸出電壓，也可用于測量從J1插座輸入的外接電壓，須用開關(guān)J2加以選擇。J4插座提供由PCF8591輸
             -出的時(shí)鐘方波信號(hào)。SAA1064驅(qū)動(dòng)四個(gè)數(shù)碼管顯示一路AD轉(zhuǎn)換后得到的數(shù)據(jù)。顯示格式如下表：
   3          通道號(hào):               AD轉(zhuǎn)換結(jié)果(高四位)           AD轉(zhuǎn)換結(jié)果(低四位)
   4             3                         E                              7
   5          函數(shù)SLA_READ(char chip_select, char channel)中的channel就是通道號(hào)選擇變量.channel=0到3.本程序選定channel=3
             -(用戶可修改),用小改刀調(diào)節(jié)R4,可觀察到數(shù)碼管上顯示的數(shù)據(jù)的變化.*/
   6          #include <c8051f020.h>                    // SFR declarations
   7          #include <intrins.h>
   8          #define  WRITE       0x00                 // 寫位
   9          #define  READ        0x01                 // 讀位           
  10          #define  CHIP_B      0x70
  11          #define  SMB_START      0x08  // （MT＆MR）主收發(fā)器發(fā)送起始位成功.再將從機(jī)寫地址送SMB0DAT
  12          #define  SMB_RP_START   0x10  // (MT & MR)主收發(fā)器重復(fù)發(fā)送起始位成功,再將從機(jī)讀地址送SMB0DAT
  13          #define  SMB_MTADDACK   0x18  // （MT）主收發(fā)器發(fā)送從地址＋W成功；收到 ACK        
  14          #define  SMB_MTADDNACK  0x20  // (MT) 主收發(fā)器發(fā)送從地址＋W成功；收到 NACK        
  15          #define  SMB_MTDBACK    0x28  //（MT）主收發(fā)器發(fā)送數(shù)據(jù)字節(jié)成功；收到ACK.           
  16          #define  SMB_MRADDACK   0x40  // （MR）主收發(fā)器發(fā)送從地址＋R成功；收到 ACK.
  17          #define  SMB_MRDBACK    0x50  // （MR）主收發(fā)器接收數(shù)據(jù)成功；主機(jī)發(fā)送ACK 
  18          #define  SMB_MRDBNACK   0x58  // （MR）主收發(fā)器接收數(shù)據(jù)成功；主機(jī)發(fā)送NACK 
  19          char COMWRITE;         //保存從地址 + R/W 位,用在 中斷服務(wù)函數(shù)中
  20          char COMREAD;                                         
  21          unsigned char totalnumber,sendnumber,WORD;     
  22          unsigned char  INTERRUPT[20],L;
  23          unsigned char xdata  channel=3;    // channel保存AD通道變量,channel=0--3.
  24          unsigned char xdata SENDMODE;      // SENDMODE=1為寫(SLA_SEND),SENDMODE=0為讀(SLA_READ)
  25          bit SM_BUSY;                      // 在收/發(fā)過程中,SM_BUSY被置1.中斷服務(wù)完成后被清為另.
  26          unsigned char wr_data[8];         //保存寫入從器件的數(shù)據(jù)
  27          unsigned char rd_data[8];         //保存從從器件中讀出的數(shù)據(jù)
  28          void SYSCLK_Init (void);
  29          void SMBUS_ISR (void);
  30          char SLA_READ(char chip_select, char channel);
  31          //channel就是通道號(hào)選擇變量.channel=0到3
  32          void SLA_SEND(char chip_select, char *wr_data, char number);
  33          //chip_select為從器件的寫地址
  34          char temp;              
  35          char Number[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};  //LED