Design and implementation of 16x2 dot matrix character liquid crystal module

To achieve efficient control of the 16x2 dot matrix character liquid crystal module , the relevant subroutine must be established according to the module design method. The function subroutines for driving the 16x2 dot matrix character liquid crystal module are described in detail below.

Design and implementation of 16x2 dot matrix character liquid crystal module

1. Write commands to LCM subfunctions

vOid LCDWriteCommand(uchar CMD, uchar Attribc)

The /* function writes a command called WriteCommandLCM to the LCM subfunction.

Define CMD and Attribc as unsigned character variables. */

{

If(Attribc)WaitForEnable();

/* If Arrribc is "true", call the WaitForEnable subfunction to perform busy detection*/

LCM_RS_0; LCM_RW_0; _NOP0;

/*Select the instruction register, write mode*/

DataPort=CMD;_NOP();

/* Transfer the command in the variable WCLCM to the data port

LCM_EN_1;_NOP0;_NOP(); LCM_EN_O:

The /*LCM_EN terminal generates a falling edge of the pulse. */

}

The /*WriteCommandLCM subfunction ends. */

2, write data to the LCM subfunction

Void LcdWritEDAta(dchar dataW)

The /* function writes data named WriteDataLCM to the LCM subfunction. definition

dataW is an unsigned char type variable. */

{

The /*WriteDataLCM subfunction starts. */

WaitForEnable(); */

LCM_RS_1; LCM_RW_0; _NOP0;

/* Select the data register, write mode. */

DataPort=dataW;_NOP();

/* Transfer the data in the variable dataQW to the data port. */

LCM_EN_1;_NOP();_NOP0;LCM_EN_O:

The /*LCM_EN terminal generates a falling edge of the pulse. WriteDataLCM subfunction

End*/

3. Detect LCD busy signal subfunction

Void WaitForEnable(void)

The /* function is called WaitForEnable to detect the busy signal subroutine subfunction.

The /*WaitForEnable subfunction starts. */

Uchar val;

/* defines the local variable val. */

DataPOrt=Oxff;

/ * Set the data port to all ones. */

LCM_RS_0;LCM_RW_1;_NOP();

/* Select the instruction register, read mode. */

LCM_EN_1;_NOP();_NOP();

/* Set the LCM_EN terminal to high level and read enable. */

DDRA=0x00;

/ * Data port is set to input * /

Val=PINA:

/*Read data*/

While(val&Busy)val=PINA:

/*Detects busy signals. When the data port content is not zero after 0x80,

The program continues to read data and detect busy signals. */

LCM_EN_O:

/* Set the LCM_EN terminal to low level. */

DDRA=0xff;

/ * Data port is set to output * /

}

The /*WaitForEnable subfunction ends. */

4. Display cursor positioning subfunction

Void LOCateXY(char posx.char posy)

/*Shows the cursor positioning subfunction, the function name is LocareXY, defines posx,

Posxxy is a character variable. */

{

The /*LocateXY subfunction starts. */

Uchar temp;

/* Defines temp as an unsigned char type variable. */

Temp&=0x7f;

/*temp varies from 0-15. */

Temp=posx&0xof;

/ * Shield high 4 digits. */

Posy&=0x01;

/*posy has a range of 0-1. */

If(posy)tempㄧ=0x40;

/* If posy is 1 (display the second line), address code +0x40*/

Tempㄧ=0x80;

The /* instruction code is the address code +0x80. */

WriteCommandLCM(temp,0);

/* Writes the instruction temp to the LCM, ignoring the busy signal detection. */

}

The /*LocateXY subfunction ends. */

5. Display one character (x=0~15, y=0~1) subfunction of the specified coordinates

Void DisplayOneChar(uchar x,uchar y,uchar Wdata)

/* displays a character (x=0-15.y=0-1) subfunction of the specified coordinates,

The number is called DispOneChar, which defines x, y, and Wdata as unsigned character variables.

*/

{

/*DispOneChar function starts*/

LocateXY(x,y):

/* Call the LocateXY function to locate the display address. */

WriteDataLCM(Wdata);

/* Write data Wdata to LCM. */

}

The /*DispONeChar function ends. */

6. Demonstrate the second line of moving string subfunctions

Void Display(uchar dd)

/* demonstrates the second line of moving string subfunctions, the function name is Dispiay, defined

Dd is an unsigned character variable. */

{

The /*Display subfunction starts. */

Uchari:

/* definition; is an unsigned character variable. */

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