//******************************************************************************
// File Name : LCD.c
// Author : Steaven
// Created : 2008-07-27
// Modified :
// Revision : V0.0
//******************************************************************************
//PIN DESCRIPTION
//01 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
//GND VCC V0 RS RW EN D0 D1 D2 D3 D4 D5 D6 D7 BLA BLK
//GND +5V V0 PB0 PB1 PB2 PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 GND +5V
#include "iom16v.h"
#include "DataType.h"
#include "LCD.h"
#include "macros.h"
//local functions declaration
void Set_RS(INT8U RS);
void Set_RW(INT8U RW);
void Set_EN(INT8U EN);
void Set_Data(INT8U data);
void LCD_Write_Command(INT8U command,INT8U status);
void LCD_Write_Data(INT8U data,INT8U status);
void Delay_ms(INT8U time);
INT8U LCD_Read_BF(void);
INT8U LCD_Read_Data(INT8U status);
//******************************************************************************
// Function : Set_RS
// Input : RS - RS Control Line Level
// Output : none
// Description : LCD(1602) Low Level Interface Function
//******************************************************************************
void Set_RS(INT8U RS)
{
if(RS == 0)
{
PORTB &= ~0x01;
}
else
{
PORTB |= 0x01;
}
}
//******************************************************************************
// Function : Set_RW
// Input : RW - RW Control Line Level
// Output : none
// Description : Low Level Interface Function
//******************************************************************************
void Set_RW(INT8U RW)
{
if(RW == 0)
{
PORTB &= ~0x02;
}
else
{
PORTB |= 0x02;
}
}
//******************************************************************************
// Function : Set_EN
// Input : RW - RW Control Line Level
// Output : none
// Description : Low Level Interface Function
//******************************************************************************
void Set_EN(INT8U EN)
{
if(EN == 0)
{
PORTB &= ~0x04;
}
else
{
PORTB |= 0x04;
}
}
//******************************************************************************
// Function : Set_RW
// Input : data - Data Line Level
// Output : none
// Description : Low Level Interface Function
//******************************************************************************
void Set_Data(INT8U data)
{
PORTA = data;
}
//******************************************************************************
// Function : LCD_Read_BF
// Input : none
// Output : 0 = LCD Controller is Free,0x80 = LCD Busy
// Description : Read LCD Controller Status
//******************************************************************************
INT8U LCD_Read_BF(void)
{
INT8U status;
DDRA = 0x00;
Set_EN(0);
Set_RS(0);
Set_RW(1);
Set_EN(1);
NOP();
status = PINA;
Set_EN(0);
DDRA = 0xFF;
return(status & 0x80);
}
//******************************************************************************
// Function : LCD_Write_Command
// Input : command - Command to be written to LCD
// status - Detect LCD Status when 1
// Output : none
// Description : Write Command to LCD
//******************************************************************************
void LCD_Write_Command(INT8U command,INT8U status)
{
if(status == 1)
{
while(LCD_Read_BF() != 0) {;}
}
Set_EN(0);
Set_RS(0);
Set_RW(0);
Set_Data(command);
Set_EN(1);
NOP();
NOP();
Set_EN(0);
}
//******************************************************************************
// Function : LCD_Write_Data
// Input : data - Data to be written to LCD
// status - Detect LCD Status when 1
// Output : none
// Description : Write Data to LCD
//******************************************************************************
void LCD_Write_Data(INT8U data,INT8U status)
{
if(status == 1)
{
while(LCD_Read_BF() != 0) {;}
}
Set_EN(0);
Set_RS(1);
Set_RW(0);
Set_Data(data);
Set_EN(1);
NOP();
NOP();
Set_EN(0);
}
//******************************************************************************
// Function : LCD_Read_Data
// Input : status - Detect LCD Status when 1
// Output : Data read from LCD
// Description : Read Data from LCD
//******************************************************************************
INT8U LCD_Read_Data(INT8U status)
{
INT8U data;
if(status == 1)
{
while(LCD_Read_BF() != 0) {;}
}
DDRA = 0x00;
Set_EN(0);
Set_RS(1);
Set_RW(1);
Set_EN(1);
NOP();
NOP();
data = PINA;
Set_EN(0);
DDRA = 0xFF;
return(data);
}
//******************************************************************************
// Function : LCD_Reset
// Input : none
// Output : none
// Description : LCD software reset,must execute according to time sequence
//******************************************************************************
void LCD_Reset(void)
{
Delay_ms(15);
LCD_Write_Command(0x38,0);
Delay_ms(5);
LCD_Write_Command(0x38,0);
Delay_ms(5);
LCD_Write_Command(0x38,0);
LCD_Write_Command(0x38,1);
LCD_Write_Command(0x08,1);
LCD_Write_Command(0x01,1);
LCD_Write_Command(0x06,1);
LCD_Write_Command(0x0C,1);
}
//******************************************************************************
// Function : LCD_Show_Char
// Input : x - Row of LCD(0 to 1);
// y - Column of LCD(0 to 15);
// code - Code of Char
// Output : none
// Description : Display a Char at Setting Row and Column
//******************************************************************************
void LCD_Show_Char(INT8U x,INT8U y,INT8U code)
{
INT8U address;
if((x < 2) && (y < 16))
{
address = 0x40 * x + y;
LCD_Write_Command(0x80 | address,1);
LCD_Write_Data(code,1);
}
}
//******************************************************************************
// Function : LCD_Show_String
// Input : x - Row of LCD(0 to 1);
// y - Column of LCD(0 to 15);
// pdata - Pointer to a String
// Output : none
// Description : Display a String from at Setting Row and Column
//******************************************************************************
void LCD_Show_String(INT8U x,INT8U y,INT8U *pdata)
{
INT8U x_address = x;
INT8U y_address = y;
while(*pdata != '\0')
{
LCD_Show_Char(x_address,y_address,*pdata++);
y_address++;
if((x_address == 0) && (y_address >= 16))
{
x_address = 1;
y_address = 0;
}
else if((x_address == 1) && (y_address >= 16))
{
return;
}
}
}
//******************************************************************************
// Function : Delay_ms
// Input : time - Delay Time
// Output : none
// Description : Inaccurate ms Level Delay for Software Reset of LCD
//******************************************************************************
void Delay_ms(INT8U time)
{
INT16U cnt = 0;
while(time--)
{
for(cnt = 0;cnt < 5000;cnt++)
{
NOP();
}
}
}
//=========================END OF FILE=========================//