lcd_595.c

基于pic16分46 的rs485通讯协议

////////////////////////////////////////////////////////////////////////////
////                         LCD1602_595.C                		        ////
////            Driver for common 2x16 LCD modules                      ////
////                                                                    ////
////  lcd_init()   Must be called before any other function.            ////
////                                                                    ////
////  lcd_putchar(c)  Will display c on the next position of the LCD.   ////
////                    												////
////  lcd_gotoxy(x,y) Set write position on LCD (upper left is 0,0)     ////
////                                                                    ////
////  lcd_clear()	Will clear the display and make the cursion home    ////
////  																	////
////  lcd_putsf(str)	Will display a string on LCD                    ////
//// 																	////
////  lcd_dispdata(data) Will display data on the next position of LCD  ////
////																	////
////////////////////////////////////////////////////////////////////////////
////   MODIFY BY :	PARKENING 											////
////   TIME		 :	2007.08.24                                          ////
////////////////////////////////////////////////////////////////////////////

//// As defined in the following structure the pin connection is as follows:
//// 	RF5		SRCLK
////	RF6		RCLK
////	RF7		SER
/////////////////////////////////////////////////////////////////////////////


#include <pic16f946.h>
#include "delay.h"
#include "lcd_595.h"



//Send lcd data and lcd command to HC595
void SEND_TO_HC595(unsigned char data,unsigned char console)
{
	unsigned char tmp;
	unsigned char i;
	
	SHCLK_DIR = 0;
	STCLK_DIR = 0;
	DS_DIR = 0;
	SHCLK = 1;
	STCLK = 1;
	DS = 1;
	
	tmp = console;
	for(i=0;i<8;++i)
	{
		if((tmp&0x80)==0x80)
		{
			DS = 1;
		}
		else
		{
			DS = 0;
		}
		SHCLK = 0;
		SHCLK = 1;
		tmp = tmp << 1;
	}

	tmp = data;
	for(i=0;i<8;++i)
	{
		if((tmp&0x80)==0x80)
		{
			DS = 1;
		}
		else
		{
			DS = 0;
		}
		SHCLK = 0;
		SHCLK = 1;
		tmp = tmp << 1;
	}
	
	STCLK = 0;
	STCLK = 1;
	SHCLK = 1;
	DS = 1;
}


//Take a delay insteading of checkbusy
void lcd_checkbusy(void)
{
	DelayMs(5);
}


//Write command byte to LCD
void lcd_writecom(unsigned char combyte)
{
	unsigned char lcd_com;
	unsigned char lcd_console;
	lcd_checkbusy();
	lcd_com = combyte;
	lcd_console = 0x00;	//	RS	RW	EN
						//	0	0	0

	SEND_TO_HC595(lcd_com,lcd_console);
	lcd_console = 0x02;	//	RS	RW	EN
						//	0	0	1

	SEND_TO_HC595(lcd_com,lcd_console);
	lcd_console = 0x00;	//	RS	RW	EN
						//	0	0	0

	SEND_TO_HC595(lcd_com,lcd_console);
}


//Write data to LCD
void lcd_writedata(unsigned char data)
{
	unsigned char lcd_data;
	unsigned char lcd_console;
	lcd_checkbusy();
	lcd_data = data;
	lcd_console = 0x08;	//	RS	RW	EN
						//	1	0	0

	SEND_TO_HC595(lcd_data,lcd_console);
	lcd_console = 0x0A;	//	RS	RW	EN
						//	1	0	1

	SEND_TO_HC595(lcd_data,lcd_console);
	lcd_console = 0x08;	//	RS	RW	EN
						//	1	0	0

	SEND_TO_HC595(lcd_data,lcd_console);
}


//Initialize the LCD module
void lcd_initial(void)
{ 
	DelayMs(15);
	lcd_writecom(0x38);	// 8 bit mode, 1/16 duty, 5x8 font
	lcd_writecom(0x0c); // display on, blink curson off
	lcd_writecom(0x06);	// entry mode
}  



void lcd_clear(void)
{ 
	lcd_writecom(0x01);	//display clear
//	DelayMs(2);
	lcd_writecom(0x02);	//cursion home
//	DelayMs(2);
}


void lcd_gotoxy(unsigned char x, unsigned char y)
{
   unsigned char base_y[2]={0x80, 0xc0};  
   lcd_checkbusy(); 
   lcd_writecom(base_y[y] + x); 
}


void lcd_dispdata(unsigned int data) 
{
   unsigned char datahh;
   unsigned char datal;
   unsigned char datah,datam;
   datahh = data / 1000 + 0x30;
   data = data % 1000;
   datah = data / 100 + 0x30;
   datam=(data%100)/10 + 0x30;
   datal = (data % 100) % 10 + 0x30;
   lcd_writedata(datahh);
   lcd_writedata(datah);
   lcd_writedata(datam);
   lcd_writedata(datal);
}    
  

void lcd_putsf(unsigned char *ptr)
{ 
	while(*ptr)
		lcd_writedata(*ptr++);
}


void lcd_putchar(unsigned char lcdchar) 
{
	lcd_writedata(lcdchar);
}