msp430g2553: dual line 12864 library program

(Display) msp430g2553: dual-line 12864 library program

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LCD12864.H

****************************************************************
LCD12864 2-wire program
   rs (CS) has been externally connected to a high level
   rw (SID) P2.0
   en (SCLK) P2.1
   PSB has been externally connected to a low level
   RST has been externally connected to a high level
  hardware circuit, the resistance between the 10K resistor connected to pin 3 and the ground is generally 8.8k-9.5k
(one power supply +, two common ground wires)  
*****************************************************************

#ifndef __LCD12864_H__
#define __LCD12864_H__

#include"msp430g2553.h"

********************************
       Pin Definition
********************************
#define SID_0 P2OUT &= ~BIT0
#define SID_1 P2OUT |= BIT0
#define SCLK_0 P2OUT &= ~BIT1
#define SCLK_1 P2OUT |= BIT1

******************************
        Command character definition
******************************
#define First_Line 0x80
#define Second_Line 0x90
#define Third_Line 0x88
#define Fourth_Line 0x98

************************************************************
                       函数定义
************************************************************
extern void LCD12864_Port_Init(void);
extern void LCD12864_write_one_byte(unsigned int byte);
extern void LCD12864_write_command(unsigned int com);
extern void LCD12864_write_data(unsigned int dat);
extern void LCD12864_Init(void);

extern void LCD12864_write_string(char adress,char *str);

#endif

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LCD12864.C

#include"LCD12864.H"

****************************
       Port initialization
****************************
void LCD12864_Port_Init(void)
{
 P2DIR=BIT0+BIT1;
}

****************************************
 Transfer byte function:
     byte type data, 1: SID transmits a high level
                 0: SID transmits a low level
******************************************
void LCD12864_write_one_byte(unsigned int byte)
{
 unsigned int i;
 for(i=0;i<8;i++)
 {
   if( byte & 0x80 )
     SID_1;
   else
     SID_0;
   SCLK_1;
   __delay_cycles(10);
   SCLK_0;
   byte<<=1;
   __delay_cycles(10);
 }
}

************************************************************************************
2-wire 128*64 data transmission:
 first determine whether to transmit commands or data
   1. The first byte: the first five must be high level, and the 12864 is initialized for two-wire transmission.
                 The sixth level is RW, the seventh is RS, and the eighth must be low level 0.
                 (1 1 1 1 1 RW RS 0)
                 (This is to correspond to the 8-wire command. Data is transmitted through the SID data line, and
                     CS is always high).               
                          RW RS byte
            write command: 0 0 0xf8
            write data: 0 1 0xfa 
            read busy: 1 0 0xfc
            read data: 1 1 0xfe          
 then start to transmit data
   2. The second byte: the upper four bits are the upper four bits of the data to be transmitted, and the lower four bits are all 0. (D7 D6 D5 D4 0 0 0 0)
   3. The third byte: the upper four bits are the lower four bits of the data to be transmitted, and the lower four bits are all 0. (D3 D2 D1 D0 0 0 0 0)
Data* command transmission completed
******************************************************************************

******************************
       写命令函数
******************************
void LCD12864_write_command(unsigned int com)
{
 unsigned int com_init=0xf8;
 unsigned int com_h,com_l;
 com_h = com & 0xf0;
 com_l = (com<<4) & 0xf0;
 
 LCD12864_write_one_byte(com_init);
 LCD12864_write_one_byte(com_h);
 LCD12864_write_one_byte(com_l);
}

*****************************
       写数据函数
*****************************
void LCD12864_write_data(unsigned int dat)
{
 unsigned int dat_init=0xfa;
 unsigned int dat_h,dat_l;
 dat_h = dat & 0xf0;
 dat_l = (dat<<4) & 0xf0;
 
 LCD12864_write_one_byte(dat_init);
 LCD12864_write_one_byte(dat_h);
 LCD12864_write_one_byte(dat_l);
}

************************************************************************************
     Init function (some places that must be set)
   command function                 
    0x30 Basic instruction set                
    0x01 Clear screen                     
    0x06 Transmit a character, cursor right, AC+1, display does not move          
    0x0c Display on
    0x0f Display on, cursor on, cursor flashing
**********************************************************************************
void LCD12864_Init(void)
{
 LCD12864_write_command(0x30);
 LCD12864_write_command(0x01);
 LCD12864_write_command(0x06);
 LCD12864_write_command(0x0f);
}

**************************************************
       The string transfer function
   sets the first position of the string, and then displays the written string
************************************************
void LCD12864_write_string(char adress,char *str)
{
 __delay_cycles(1000);
 LCD12864_write_command(adress);
 while(*str!='\0')
 {
   LCD12864_write_data(*str);
   str++;
 }
}
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