自己画的照度计仿真电路，LCD不显示字符请大神指点迷津 -

标题: 自己画的照度计仿真电路，LCD不显示字符请大神指点迷津 [打印本页]

作者: jeahio 时间: 2018-4-17 20:35
标题: 自己画的照度计仿真电路，LCD不显示字符请大神指点迷津
自己画的照度计仿真电路，LCD不显示字符

77R$}`M}4570)[PWSL4ZNUI.png (15.61 KB, 下载次数: 55)

作者: admin 时间: 2018-4-18 00:31
应该是程序有问题吧，，你应该把程序也帖出来的先转移此贴了

作者: jeahio 时间: 2018-4-18 16:57

admin 发表于 2018-4-18 00:31
应该是程序有问题吧，，你应该把程序也帖出来的先转移此贴了

程序是按照例程写的，查了说有可能是LCD1602忙检测的问题，然后把忙检测删了，改成延时，还是不亮。。
#include<at89x52.h>
#include<stdio.h>
#include<intrins.h>

#define TLC549_CS       P1_1 //片选信号
#define TLC549_DATAOUT P1_0 //数据输入口
#define TLC549_CLK    P1_2 //时钟信号

#define LCM_RW P2_1 //定义引脚
#define LCM_RS P2_2
#define LCM_E    P2_0
#define LCM_Data    P0
//#define Busy       0x80 //用于检测LCM 状态字中的Busy 标识
/*------------------------------------------
      子函数声明
------------------------------------------*/
void Write_Data_LCM(unsigned char WDLCM);
void Write_Command_LCM(unsigned char WCLCM,BuysC);
void Read_Status_LCM(void);
void LCM_Init(void);
void Set_xy_LCM(unsigned char x, unsigned char y);
void Display_List_Char(unsigned char x, unsigned char y, unsigned char *s);

void delay_nms(unsigned char n)
{
while(n)
{
_nop_();
n--;
}
}

/*=========================    函数名：Read_Status_LCM()    功  能：忙检测函数

void Read_Status_LCM(void)
{
unsigned char read=0;

        LCM_RW = 1;
        LCM_RS = 0;
LCM_E = 1;
LCM_Data = 0xff;
do    read = LCM_Data;
while(read & Busy);

LCM_E = 0;
}

/*-------------------------------------------
   函数名：Write_Data_LCM ( )
   功  能：对LCD 1602 写数据
--------------------------------------------*/
void Write_Data_LCM(unsigned char WDLCM)
{
//      Read_Status_LCM(); //检测忙

     LCM_RS = 1;
     LCM_RW = 0;

     LCM_Data &= 0x0f;
     LCM_Data |= WDLCM&0xf0;
     LCM_E = 1; //若晶振速度太高可以在这后加小的延时
     LCM_E = 1; //延时
     LCM_E = 0;

     WDLCM = WDLCM<<4;
     LCM_Data &= 0x0f;
     LCM_Data |= WDLCM&0xf0;
     LCM_E = 1;
     LCM_E = 1; //延时
     LCM_E = 0;
}

/*------------------------------------------------
   函数名：Write_Command_ LCM ( )
   功  能：对LCD 1602 写指令
--------------------------------------------------*/
void Write_Command_LCM(unsigned char WCLCM) //BuysC 为0 时忽略忙检测
{
//      if (BuysC)
//          Read_Status_LCM(); //根据需要检测忙
LCM_RS = 0;
     LCM_RW = 0;

     LCM_Data &= 0x0f;
     LCM_Data |= WCLCM&0xf0;//传输高四位
     LCM_E = 1;
LCM_E = 1;
     LCM_E = 0;

     WCLCM = WCLCM<<4; //传输低四位
     LCM_Data &= 0x0f;
     LCM_Data |= WCLCM&0xf0;
     LCM_E = 1;
     LCM_E = 1;
     LCM_E = 0;
}

/*---------------------------------------------
   函数名：LCM_Init()       功  能：对LCD 1602 初始化
----------------------------------------------*/
void LCM_Init(void) //LCM 初始化
{
     LCM_Data = 0;
     Write_Command_LCM(0x28); //三次显示模式设置，不检测忙信号
delay_nms(15);
     Write_Command_LCM(0x28);
delay_nms(15);
     Write_Command_LCM(0x28);
delay_nms(15);
//      Write_Command_LCM(0x28,1); //显示模式设置,开始要求每次检测忙信号
     Write_Command_LCM(0x08,1); //关闭显示
delay_nms(15);
     Write_Command_LCM(0x01,1); //显示清屏
delay_nms(15);
     Write_Command_LCM(0x06,1); //显示光标移动设置
delay_nms(15);
     Write_Command_LCM(0x0C,1); //显示开及光标设置
delay_nms(15);
}

/*-------------------------------------------
   函数名：Set_xy_LCM ()
   功  能：设定显示坐标位置
--------------------------------------------*/
void Set_xy_LCM(unsigned char x, unsigned char y)
{
     unsigned char address;
if( x == 0 )
address = 0x80+y;
else
address = 0xc0+y;
     Write_Command_LCM(address,1);
}

/*-------------------------------------------
函数名：Display_List_Char()
  功  能：按指定位置显示一串字符
--------------------------------------------*/
void Display_List_Char(unsigned char x, unsigned char y, unsigned char *s)
{
     Set_xy_LCM(x,y);
while(*s)
      {
         LCM_Data = *s;
Write_Data_LCM(*s);
s++;
   }
}

void delay_us(unsigned char n)
{
while(n)
{
_nop_();
n--;
}
}
unsigned char ad_conv_tlc549() //TLC549A/D转换子函数
{
unsigned char i;
unsigned char tmp_data=0;
TLC549_CS=1;    //此时DATA OUT接口处于高阻态，I/O CLK不起作用
_nop_();
TLC549_CLK=0;
_nop_();
TLC549_CS=0;    //等待两个内部时钟上升沿和一个下降沿，单片机确认这一变化，然后自动将前一次转换结果的最高位（D7）位输出到DATAOUT
_nop_();
_nop_();

for(i=0;i<8;i++)
{
TLC549_CLK=1;
tmp_data=(tmp_data<<1)|TLC549_DATAOUT;
TLC549_CLK=0;
}
TLC549_CS=1;
delay_us(17);
return tmp_data;
}

void init_uart()    //串口初始化子函数
{
TMOD=0x20;       //use timer1，mode2
TH1=0xfd;          //19200
TL1=0xfd;          //19200
PCON=0x80;
SCON=0x52;
TCON=0x69;
EA=1;             //start uart
}

void main()          //主函数
{
unsigned char str[32];
unsigned char longstr[16];
float v;
float L;
float u;
init_uart();
LCM_Init();
while(1)
{
v=(int)ad_conv_tlc549()*1.0/256.0*5.0;
u=v*1000;                            //转换成毫伏显示
L=v*10.0*100.0;                      //标定后0~50000lux对应输出0~5V DC，则Y=10X
sprintf(str,"U=%.2fmV",u);             //显示电压值
sprintf(longstr,"L=%.2fLux",L);       //显示光照强度值，单位为lux
Display_List_Char(0,0,&str);
Display_List_Char(1,0,&longstr);
delay_nms(200);
printf("U=%.2fmV\r\n",u);             //输出U=？V的字符串，带小数点，两位小数
}
}

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