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标题: c8051的LCD1602液晶驱动程序范例很有参考价值 [打印本页]

作者: joyrus 时间: 2012-7-9 00:36
标题: c8051的LCD1602液晶驱动程序范例很有参考价值
本帖最后由 joyrus 于 2012-7-9 12:04 编辑

C/C++ code

//==============================================//
// Filename: C8051f320_SMC1602A_Display.c    //
//                                           //
// Prozessor:  C8051f320                      //
// Compiler: Keil C51 7.06                   //
//                                           //
// Author:    Paul.Jia                      //
// QQ:       79974439                      //
// Copyright:  MKL PSC TSD                   //
//==============================================//

//================================================
//1. SYSCLK is unlimited here
//2. Display by SMC1602A
//
//Use 3 ports for control
//Use 8 ports for data communications
//And initialize them right in the Main
//
//Need ms delay function from the Main
// extern void delay_ms(unsigned short ms);
//
//Need initialize before use the diaplay function
// void LCMInit(void);
//
//Export these 2 function
// void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
// void DisplayListChar(unsigned char X, unsigned char Y, unsigned char *DData);
//================================================

//----------------------------
// Include Files
//----------------------------

#include <c8051f320.h>
#include <intrins.h>

//----------------------------
// Global Constants
//----------------------------

// Define control ports and data ports
// P0.5 - digital push-pull (1602)RS
// P0.6 - digital push-pull (1602)RW
// P0.7 - digital push-pull (1602)E
// P1.x - digital push-pull (1602)DATA
// Have to initalize these ports in the Main
//
sbit RS1602 = P0 ^ 5;                            // Register select signal port
sbit RW1602 = P0 ^ 6;                            // Data read/write port
sbit E1602  = P0 ^ 7;                            // Enable signal port
#define DATA1602 P1                            // Data port

// Define macro definition basic the selected ports
//
#define W_D_IN P1MDOUT &= 0x00                // Change Data port to open-drain
#define W_D_OUT  P1MDOUT |= 0xFF                // Change Data port to push-pull

// Define device busy flag
//
#define Busy    0x80

//----------------------------
// Function Prototypes
//----------------------------

// Write data to SMC1602A
//
void WriteDataLCM(unsigned char WDLCM);

// Write command to SMC1602A
//
void WriteCommandLCM(unsigned char WCLCM, unsigned char BusyC);

// Read data from SMC1602A
//
unsigned char ReadDataLCM(void);

// Read command from SMC602A
//
unsigned char ReadStatusLCM(void);

// Initalize SMC1602A
//
void LCMInit(void);

// Display a char at the specified position
//
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);

// Display a string at the specified position
//
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char *DData);

// Call a extern ms delay function
//
extern void delay_ms(unsigned short ms);

//----------------------------
// Subroutines
//----------------------------

//-----------------Write Data---------------------
void WriteDataLCM(unsigned char WDLCM)
//------------------------------------------------
{
ReadStatusLCM();       // Detect Busy
W_D_OUT;                   // Change Data port to push-pull
DATA1602 = WDLCM;    // Write data
RS1602 = 1;                // LCM_RS = 1;
RW1602 = 0;                // LCM_RW = 0;
E1602 = 0;    // LCM_E = 0; If SYSCLK is high, add a small delay into here
delay_ms(4);
E1602 = 1;                   // LCM_E = 1;
}

//----------------Write Command-------------------
void WriteCommandLCM(unsigned char WCLCM, unsigned char BusyC)
//------------------------------------------------
{
if(BusyC)                   // Decide if detect Busy from parameter
{
      ReadStatusLCM();       // Detect Busy
}
W_D_OUT;                // Change Data port to push-pull
DATA1602 = WCLCM;    // Write command
RS1602 = 0;             // LCM_RS = 0;
RW1602 = 0;             // LCM_RW = 0;
E1602 = 0;                // LCM_E = 0; If SYSCLK is high, add a small delay into here
delay_ms(4);
E1602 = 1;                // LCM_E = 1;
}

/*
//------------------Read Data---------------------
unsigned char ReadDataLCM(void)
//------------------------------------------------
{
RS1602 = 1;       // LCM_RS = 1;
RW1602 = 1;       // LCM_RW = 1;
E1602 = 0;          // LCM_E = 0; If SYSCLK is high, add a small delay into here
delay_ms(4);
E1602 = 1;          // LCM_E = 1;
W_D_IN;             // Change Data port to open-drain
return DATA1602; // Return data
}
*/

//-----------------Read Command-------------------
unsigned char ReadStatusLCM(void)
//------------------------------------------------
{
W_D_IN;       // Change Data port to open-drain
RS1602 = 0;    // LCM_RS = 0;
RW1602 = 1; // LCM_RW = 1;
E1602 = 0;    // LCM_E = 0; If SYSCLK is high, add a small delay into here
delay_ms(4);
E1602 = 1;       // LCM_E = 1;
while(DATA1602 & Busy); // Detect Busy
return DATA1602;          // Return data
}

//------------------Initalize---------------------
void LCMInit(void)
//------------------------------------------------
{
DATA1602 = 0;
   WriteCommandLCM(0x38, 0);    // Set display mode 3 times, no detect Busy
delay_ms(5);
WriteCommandLCM(0x38, 0);
delay_ms(5);
WriteCommandLCM(0x38, 0);
delay_ms(5);
// Keep above code

WriteCommandLCM(0x38, 1); // Set display mode(8 bits, 2 rows, 5x7), begin detect Busy everytime
WriteCommandLCM(0x08, 1); // Close display
WriteCommandLCM(0x01, 1); // Clear screen
WriteCommandLCM(0x06, 1); // Show the position of cursor move
WriteCommandLCM(0x0C, 1); // Show boot-strap cursor setting
WriteCommandLCM(0x80, 1); // The first position is row 1 line 1
}

//----------------Display one char----------------
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
//------------------------------------------------
{
Y &= 0x1;
X &= 0xF;       // Revise X<=15 Y<=1
if(Y)                // Add 0x40 to address for display row 2
{
      X |= 0x40;
}
X |= 0x80;       // Count the address
WriteCommandLCM(X, 0); // Send the address to SMC1602A
WriteDataLCM(DData);    // Write the char to SMC1602A
}

//----------------Display list char---------------
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char *DData)
//------------------------------------------------
{
unsigned char ListLength = 0;
Y &= 0x1;
X &= 0xF;    // Revise X<=15 Y<=1
while(DData[ListLength] >= 0x20)    // If the string end, quit
{
      if(X <= 0xF)
      {
         DisplayOneChar(X, Y, DData[ListLength]); // Display one char
         ListLength++;
         X++;
      }
}
}

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