单片机DS3231程序 12M时钟，每次读出来的数据都不对

ID:594395 · 发表于 2019-10-22 14:39

12M时钟，不过每次读出来的数据都不对 ,希望有人指导下小弟

#define _MAIN_C
#include "all.h"
#include "Lcd1602.h"
#include "DS3232.h"
#include "main.h"

bit flag1s = 0;
unsigned char T0RH = 0;
unsigned char T0RL = 0;

void main()
{
      InitLcd1602();
      ConfigTimer0(1);

      while(!flag1s);
      flag1s = 0;
      DS3232_Write_Reg(0x00,0x00);
      while(1)
      {
            if(flag1s)
            {
                     flag1s = 0;
                     Refresh_Time_Show();
            }
      }
}
void ConfigTimer0(unsigned int ms)
{
      unsigned long temp = 0;

      temp = 11059200 / 12;
      temp = (temp * ms) / 1000;
      temp = 65536 - temp;
      T0RH = (unsigned char)(temp >> 8);
      T0RL = temp;
      TMOD = (TMOD & 0xF0) | 0x01;
      ET0 = 1;
      TR0 = 1;
      EA = 1;
}
void Refresh_Time_Show()
{
      uint8 time;
      uint8 str[5];

      time = DS3231_Read_Reg(0x00);
      str[0] = (time >> 4) + '0';
      str[1] = (time & 0x0F) + '0';
      str[2] = '\0';
      LcdShowStr(0,0,str);
}
void Timer0Interrupt() interrupt 1
{
      static unsigned int timer1s = 0;

      TH0 = T0RH;
      TL0 = T0RL;

      timer1s++;
      if(timer1s >= 1000)
      {
            timer1s = 0;
            flag1s = 1;
      }
}
//---------------------------------------------------------------------------------------------------------------------------------------------------
#define _LCD1602_C
#include "all.h"
#include "Lcd1602.h"

void LcdReady()
{
      unsigned char sta;

      LCD1602_DB = 0xFF;
      LCD1602_RS = 0;
      LCD1602_RW = 1;
      do
      {
            LCD1602_E = 1;
            sta = LCD1602_DB;
            LCD1602_E = 0;
      } while(sta & 0x80);
}
/* 写命令 */
void LcdWriteCmd(unsigned char cmd)
{
      LcdReady();
      LCD1602_RS = 0;
      LCD1602_RW = 0;
      LCD1602_DB = cmd;
      LCD1602_E = 1;
      LCD1602_E = 0;
}
/* 写数据 */
void LcdWriteData(unsigned char dat)
{
      LcdReady();
      LCD1602_RS = 1;
      LCD1602_RW = 0;
      LCD1602_DB = dat;
      LCD1602_E = 1;
      LCD1602_E = 0;
}
/* 设置RAM起始地址，光标位置 */
void LcdSetAddr(unsigned char x,unsigned char y)
{
      unsigned char addr;

      if(y == 0)
            addr = 0x00 + x;
      else
            addr = 0x40 + x;
      LcdWriteCmd(addr | 0x80);
}
/* 在液晶显示字符串，(x，y)起始坐标，str字符串指针 */
void LcdShowStr(unsigned char x,unsigned y,unsigned char * str)
{
      LcdSetAddr(x,y);
      while(*str != '\0')
      {
            LcdWriteData(*str++);
      }
}

/* 初始化液晶 */
void InitLcd1602()
{
      LcdWriteCmd(0x38); // 16*2显示，5*7点阵，8位数据接口
      LcdWriteCmd(0x0C); // 显示器开，光标关闭
      LcdWriteCmd(0x06); // 文字不动，地址自动加1
      LcdWriteCmd(0x01); // 清屏
}
//----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
#define _IIC_C
#include "all.h"
#include "IIC.h"
void IIC_Delay()
{
      _nop_();_nop_();_nop_();_nop_();_nop_();
}
void IIC_Start()
{
      IIC_SCL = 1;
      IIC_SDA = 1;
      IIC_Delay();
      IIC_SDA = 0;
      IIC_Delay();
      IIC_SCL = 0;
}
void IIC_Stop()
{
      IIC_SCL = 0;
      IIC_SDA = 0;
      IIC_Delay();
      IIC_SCL = 1;
      IIC_Delay();
      IIC_SDA = 1;
      IIC_Delay();
}
void IIC_Write_Byte(uint8 dat)
{
      uint8 mask;

      for(mask = 0x80;mask != 0;mask >>= 1)
      {
            if((mask & dat) != 0)
                     IIC_SDA = 1;
            else
                     IIC_SDA = 0;
            IIC_Delay();
            IIC_SCL = 1;
            IIC_Delay();
            IIC_SCL = 0;
      }
      IIC_SDA = 1;
      IIC_Delay();
}
bit IIC_Read_Ack()
{
      bit ack = 1;
      uint8 i = 0;

      IIC_SCL = 1;
      IIC_Delay();
      while((ack) && (i < 4))
      {
            ack = IIC_SDA;
            i++;
      }
      IIC_SCL = 0;

      return ack;
}
uint8 IIC_Read_Byte()
{
      uint8 mask;
      uint8 dat;

      IIC_SDA = 1;
      for(mask != 0x80;mask != 0;mask >>= 1)
      {
            IIC_Delay();
            IIC_SCL = 1;
            if(IIC_SDA != 0)
                     dat |= mask;
            else
                     dat &= ~mask;
            IIC_Delay();
            IIC_SCL = 0;
      }

      return dat;
}
/* 单片机发送应答信号 ACK = 0； NACK = 1 */
void IIC_Write_Ack(bit ack)
{
      IIC_SDA = ack;
      IIC_Delay();
      IIC_SCL = 1;
      IIC_Delay();
      IIC_SCL = 0;
      IIC_Delay();
      IIC_SDA = 1; // 释放IIC_SDA
      IIC_Delay();
}
//------------------------------------------------------------------------------------------------------------------------------------------------------------
#define _DS3232_C
#include "all.h"
#include "IIC.h"
#include "DS3232.h"

void DS3232_Write_Reg(uint8 addr,uint8 dat)
{
      IIC_Start();
      IIC_Write_Byte(0x68 << 1);
      IIC_Read_Ack();
      IIC_Write_Byte(addr);
      IIC_Read_Ack();
      IIC_Write_Byte(dat);
      IIC_Read_Ack();
      IIC_Stop();
}
uint8 DS3231_Read_Reg(uint8 addr)
{
      uint8 dat;

      IIC_Start();
      IIC_Write_Byte(0x68 << 1);
      IIC_Read_Ack();
      IIC_Write_Byte(addr);
      IIC_Read_Ack();

      IIC_Start();
      IIC_Write_Byte((0x68 << 1) | 0x01);
      IIC_Read_Ack();
      dat = IIC_Read_Byte();
      IIC_Write_Ack(1);
      IIC_Stop();

      return dat;
}

ID:235200 · 发表于 2019-10-23 00:10

检查程序是否满足DS3231的时序

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