MSP430 MCU Practice --- Digital LCD-1602 Display

/**************************************************
* 
* LCD1602 display
* cpu:AVRmega16
*
* Description: 4-line data width, operate Lcd1602
* The first line on the LCD1602 screen displays　www.goodmcu.cn 
* The second line displays 13652037001
* If there is no display, please press the reset button and try several more times
*
* Debugging successful (the problem is mainly because the 2K grounding resistor of LCD pin 3 V0 is not connected properly)
*
* Hardware circuit: MSP430F135 core experiment board-Type I
* Hardware connection: 
* 
* MSP430 and LCD connection information 
* LCD1602, 4-bit interface, that is, using D4-D7 data port, D0-D3 is not connected to MCU
* PIN1 --> Ground
* PIN2 --> VCC (must be connected to +5V)
* PIN3 --> 2K resistor --> Ground (must be connected properly, otherwise there will be no display)
* PIN4 --> RS --> P5.0
* PIN5 --> R/W --> GND
* PIN6 --> EN --> P5.1
* PIN7 --> D0 not connected
* PIN8 --> D1 not connected
* PIN9 --> D2 not connected
* PIN10 --> D3 not connected
* PIN11 --> D4 --> P4.4
* PIN12 --> D5 --> P4.5
* PIN13 --> D6 --> P4.6
* PIN14 --> D7 --> P4.7
* PIN15 --> VCC (must be connected to +5V, if you don't want backlight, you can leave it unconnected)
* PIN16 --> Ground

* Debugger: MSP430FET full series JTAG emulator
* Debug software: IAR Embedded Workbench Version: 3.41A Compilation
******************************************************/

#include  
#include 

////Pin definition////////////////////////////////////////////////////////////////////////
#define LCD_EN_PORT P5OUT //The following two should be set to the same port 
#define LCD_EN_DDR P5DIR 
#define LCD_RS_PORT P5OUT //The following two should be set to the same port 
#define LCD_RS_DDR P5DIR 
#define LCD_DATA_PORT P4OUT //The following 3 should be set to the same port 
#define LCD_DATA_DDR P4DIR //Be sure to use the high 4 bits 
#define LCD_RS BIT0
#define LCD_EN BIT1
#define LCD_DATA BIT4|BIT5|BIT6|BIT7

////预定义函数//////////////////////////////////////////////////////////////////
void LCD_init(void); 
void LCD_en_write(void); 
void LCD_write_command(unsigned char command);
void LCD_write_data(unsigned char data); 
void LCD_set_xy (unsigned char x, unsigned char y); 
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s); 
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data); 
void delay_nus(unsigned int n); 
void delay_nms(unsigned int n);

void main()
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog

LCD_init(); 
LCD_write_string(1,0," www.goodmcu.cn "); 
LCD_write_string(2,1,"13652037001"); 
delay_nms(50);
LCD_write_command(0x01); //Clear screen
delay_nms(50);
LCD_write_char(2,1,'1');
delay_nms(50);
LCD_write_char(3,1,'3');
delay_nms(50);
LCD_write_char(4, 1,'6');
delay_nms(50);
LCD_write_char(5,1,'5');
delay_nms(50);
LCD_write_char(6,1,'2');
delay_nms(50);
LCD_write_char(7,1, '0');
delay_nms(50);
LCD_write_char(8,1,'3');
delay_nms(50);
LCD_write_char(9,1,'7'); 
delay_nms(50);
LCD_write_char(10,1,'0');
delay_nms(50);
LCD_write_char( 11,1,'0');
delay_nms(50);
LCD_write_char(12,1,'1');
}
//LCD liquid crystal operation function////////////////// ////////////////////////////////////////////////
//LCD1602 LCD initialization 
void LCD_init(void) 
{ 
LCD_DATA_DDR|=LCD_DATA; //Data port direction is output
LCD_EN_DDR|=LCD_EN; //Set EN direction to output
LCD_RS_DDR|=LCD_RS; //Set RS direction to output

LCD_write_command(0x28); //4-bit data interface
delay_nus(40); 
LCD_write_command(0x28); //4-bit display
LCD_write_command(0x0c); //Display on
LCD_write_command(0x01); //Clear delay_nms
(2); 
} 
//LCD enable 
void LCD_en_write(void) 
{ 
LCD_EN_PORT|=LCD_EN; 
delay_nus(1); 
LCD_EN_PORT&=~LCD_EN; 
} 
//Write command 
void LCD_write_command(unsigned char command) 
{ 
delay_nus(16) ; 
LCD_RS_PORT&=~LCD_RS; //RS=0 
LCD_DATA_PORT&=0X0f; //Clear high four bits 
LCD_DATA_PORT|=command&0xf0; //Write high four bits 
LCD_en_write(); 
command=command<<4; //Move the lower four bits to the upper four bits 
LCD_DATA_PORT&=0x0f; //Clear the upper four bits 
LCD_DATA_PORT|=command&0xf0; //Write the lower four bits 
LCD_en_write(); 
} 
//Write data 
void LCD_write_data(unsigned char data) 
{ 
delay_nus(16) ; 
LCD_RS_PORT|=LCD_RS; //RS=1 
LCD_DATA_PORT&=0X0f; //Clear high four bits 
LCD_DATA_PORT|=data&0xf0; //Write high four bits 
LCD_en_write(); 
data=data<<4; //Move low four bits to high four bits LCD_DATA_PORT 
&=0X0f; //Clear high four bits 
LCD_DATA_PORT|=data&0xf0; //Write low four bits 
LCD_en_write(); 
} 
//Write address function 
void LCD_set_xy( unsigned char x, unsigned char y )
{ 
unsigned char address; 
if (y == 0) address = 0x80 + x; 
else address = 0xc0 + x; 
LCD_write_command( address); 
} 
//LCD writes a string at any position
//column x = 0~15, row y = 0,1 
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s) 
{ 
LCD_set_xy( X, Y ); //write addresswhile 
(*s) //write display characters 
{ 
LCD_write_data( *s ); 
s ++; 
}
}
//LCD writes characters at any position
//column x=0~15, row y=0,1 
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data) 
{ 
LCD_set_xy( X, Y ); //write addressLCD_write_data 
( data); 
}

//
Delay function /
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