ATmega128 parallel control with font library 12864 program

The characteristic is that there are many io ports, so we can drive this LCD screen in parallel to increase the speed of the bus. This program is collected from the Internet, but it has been verified by me and can be used, so it is published here. When you apply it, you only need to change the corresponding io.

 

Software: GCC V4.20
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Experimental content: Write Lcd12864_ST7920.
-------------------------------------------------- -------------
Hardware Connection:
LCD12864_ST7920 ATmega128
1.GND -------- GND
2.VCC -------- VCC
3.V0 -------- NC
4.RS(CS) -------- PD7
5.R/W(SID) -------- PG0
6.E(SCLK) -------- PG1
7.D0 -------- PC0
8.D1 -------- PC1
9.D2 -------- PC2
10.D3 -------- PC3
11.D4 -------- PC4
12.D5 -------- PC5
13.D6 -------- PC6
14.D7 -------- PC7
15.PSB -------- VCC
16.NC -------- NC
17.RST -------- VCC
18.NC -------- NC
19.LED+ -------- VCC
20.LED---------GND
The following is the program source code:
-------------------------------------------------- -------------*/
#include 
#include 
#include 
#define E_set PORTG|=_BV(PG1) //LCD enable
#define E_clear PORTG&=~_BV(PG1)
#define RW_set PORTG|=_BV(PG0) //LCD read and write
#define RW_clear PORTG&=~_BV(PG0)
#define RS_set PORTD|=_BV(PD7) //LCD data
#define RS_clear PORTD&=~_BV(PD7) //LCD instruction
unsigned char j=0;
unsigned char yb=0x80;
unsigned char name00[] PROGMEM={"Flying and shooting white deer in the snowy sky,"};
unsigned char name01[] PROGMEM={"Xiaoshu Shenxia Yibiyuan."};
unsigned char name02[] PROGMEM={"Heroes have always been extraordinary and eccentric since ancient times."};
unsigned char name03[] PROGMEM={"Mr. Jin writes with all his might."};
unsigned char name10[] PROGMEM={"Li Bai is about to set off on a boat,"};
unsigned char name11[] PROGMEM={"Suddenly I heard singing on the shore."};
unsigned char name12[] PROGMEM={"The water depth of Taohuatan is a thousand feet,"};
unsigned char name13[] PROGMEM={"Not as good as the love Wang Lun gave me."};
unsigned char name20[] PROGMEM={"this is a 12864 "};
unsigned char name21[] PROGMEM={"display program,"};
unsigned char name22[] PROGMEM={"welcome to commu"};
unsigned char name23[] PROGMEM={"nicate with me! "};

void wr_com(unsigned char);
void wr_data(unsigned char);
void reset (void);
void outChinese(unsigned char, unsigned char, unsigned char *point);
void ydgb(void);
void outchar(unsigned char, unsigned char, unsigned char *point);

void wr_com(unsigned char value)//Write instruction, RS=0;RW=0 must be used when writing instruction;
{
 E_clear;
 RS_clear;
 RW_clear;
 _delay_ms(1);
 PORTC=value; //Incorporate character data
 E_set;
 _delay_ms(2); //If there is no delay, a busy check instruction must be added
 E_clear;
}
void wr_data(unsigned char sj)//Write data, RS=1;RW=0 must be set when writing data;
{
 E_clear;
 RS_set;
 RW_clear;
 _delay_ms(1);
 PORTC=sj;
 E_set;
 _delay_ms(1); //If there is no delay, a busy check instruction must be added
 E_clear;
}
void reset (void)
{
 wr_com(0x01);//Clear screen
 wr_com(0x08); //Display off
 wr_com(0x03);//Return
 wr_com(0x30); //Function setting
 wr_com(0x0f); //Open the display
 wr_com(0x01);//Clear screen
}
//****************
//outChinese is the function name
//place is the first address of the displayed address
//unit character length
//charcode[] to display the data content
void outChinese(unsigned char place,unsigned char unit,unsigned char *point)
{
 unsigned char i,progdata;
 wr_com(place);
 for(i=0;i