求助：PT2259電子音量IC尋不到地址。有玩過的大神指導(dǎo)下(附程序)

ID:129964 · 發(fā)表于 2016-7-18 22:34

89c52外掛24c02跟一個(gè)PT2259；

程序就發(fā)送一個(gè)地址碼，接收ACK信號，并把接收到的ACK信號用液晶顯示出來；

發(fā)送 0x50 24c02有應(yīng)答信號；

但我按PT2259資料寫的四個(gè)地址：0x88;0x89;0x8D;0x8C  都測試一邊都沒有收到應(yīng)答信號！

這是什么回事啊？是不是24C02跟PT2259的尋址方式不同？

程序：
LCD1206.C
///////////////////////////////////////////////////////////////////////////////////////////////////////

#include <reg52.h>

#define LCD1602_DB  P0
sbit LCD1602_RS = P1^2;
sbit LCD1602_RW = P1^1;
sbit LCD1602_E  = P1^0;
/* 等待液晶準(zhǔn)備好 */
void LcdWaitReady()
{
unsigned char sta;

LCD1602_DB = 0xFF;
LCD1602_RS = 0;
LCD1602_RW = 1;
do {
      LCD1602_E = 1;
      sta = LCD1602_DB; //讀取狀態(tài)字
      LCD1602_E = 0;
} while (sta & 0x80); //bit7等于1表示液晶正忙，重復(fù)檢測直到其等于0為止
}
/* 向LCD1602液晶寫入一字節(jié)命令，cmd-待寫入命令值 */
void LcdWriteCmd(unsigned char cmd)
{
LcdWaitReady();
LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_DB = cmd;
LCD1602_E  = 1;
LCD1602_E  = 0;
}
/* 向LCD1602液晶寫入一字節(jié)數(shù)據(jù)，dat-待寫入數(shù)據(jù)值 */
void LcdWriteDat(unsigned char dat)
{
LcdWaitReady();
LCD1602_RS = 1;
LCD1602_RW = 0;
LCD1602_DB = dat;
LCD1602_E  = 1;
LCD1602_E  = 0;
}
/* 設(shè)置顯示RAM起始地址，亦即光標(biāo)位置，(x,y)-對應(yīng)屏幕上的字符坐標(biāo) */
void LcdSetCursor(unsigned char x, unsigned char y)
{
unsigned char addr;

if (y == 0)  //由輸入的屏幕坐標(biāo)計(jì)算顯示RAM的地址
      addr = 0x00 + x;  //第一行字符地址從0x00起始
else
      addr = 0x40 + x;  //第二行字符地址從0x40起始
LcdWriteCmd(addr | 0x80);  //設(shè)置RAM地址
}
/* 在液晶上顯示字符串，(x,y)-對應(yīng)屏幕上的起始坐標(biāo)，str-字符串指針 */
void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str)
{
LcdSetCursor(x, y); //設(shè)置起始地址
while (*str != '\0')  //連續(xù)寫入字符串?dāng)?shù)據(jù)，直到檢測到結(jié)束符
{
      LcdWriteDat(*str++);
}
}
/* 初始化1602液晶 */
void InitLcd1602()
{
LcdWriteCmd(0x38);  //16*2顯示，5*7點(diǎn)陣，8位數(shù)據(jù)接口
LcdWriteCmd(0x0C);  //顯示器開，光標(biāo)關(guān)閉
LcdWriteCmd(0x06);  //文字不動，地址自動+1
LcdWriteCmd(0x01);  //清屏
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
main.c
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#include <reg52.h>
#include <intrins.h>

#define I2CDelay()  {_nop_();_nop_();_nop_();_nop_();}
sbit I2C_SCL = P3^6;
sbit I2C_SDA = P3^7;

extern void InitLcd1602();
extern void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str);
bit I2CAddresing(unsigned char addr);
void main()
{
      bit ack = 0;
      unsigned char str[10];

InitLcd1602(); //初始化液晶

      ack = I2CAddresing(0x88);
      str[0] = '5';
      str[1] = '0';
      str[2] = ':';
      str[3] = (unsigned char)ack + '0';
      str[4] = '\0';
      LcdShowStr(0, 0, str);
////////////////////////////////////////////////////////////////////////
      ack = I2CAddresing(0x89);
      str[0] = '6';
      str[1] = '2';
      str[2] = ':';
      str[3] = (unsigned char)ack + '0';
      str[4] = '\0';
      LcdShowStr(8, 0, str);
  ////////////////////////////////////////////////////////////////////
while (1);
}
void I2CStart()
{
      I2C_SDA = 1;
      I2C_SCL = 1;
      I2CDelay();
      I2C_SDA = 0;
      I2CDelay();
      I2C_SCL = 0;
}
void I2CStop()
{
      I2C_SCL = 0;
      I2C_SDA = 0;
      I2CDelay();
      I2C_SCL = 1;
      I2CDelay();
      I2C_SDA = 1;
      I2CDelay();
}
bit I2CWrite(unsigned char dat)
{
      bit ack = 0;
      unsigned char mask;
      for(mask=0x80; mask!=0; mask>>=1)
      {
            if((mask&dat) == 0)
                     I2C_SDA = 0;
            else
                     I2C_SDA = 1;
            I2CDelay();
            I2C_SCL = 1;
            I2CDelay();
            I2C_SCL = 0;
      }
      I2C_SDA = 1;
      I2CDelay();
      I2C_SCL = 1;
      ack = I2C_SDA;
      I2CDelay();
      I2C_SCL = 0;

      return ack;
}
bit I2CAddresing(unsigned char addr)
{
      bit ack = 0;

      I2CStart();
      ack = I2CWrite(addr << 1);
      I2CStop();

      return ack;
}