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/**
* Hardware LCD display port assignment.
* Adjust \b LCD_PORT to match hardware.
* \hideinitializer
*/
#define LCD_PORT P1
#define INST_REG 0 // LCD instruction register
#define DATA_REG 1 // LCD data register
#define LINE1_ADDR 0x00 // Start of line 1 in the DD-Ram
#define LINE2_ADDR 0x40 // Start of line 2 in the DD-Ram
#define CLEAR_DISPLAY 0x01 // LCD display clear command
/**
* Sets lcd cursor position.
* \param address The address to move cursor to as an \b unsigned \b char.
* \return -
* \hideinitializer
*/
#define LCD_SET_ADDR(address) (lcd_wr_reg(INST_REG, (address) | 0x80))
/**
* Gets lcd cursor position.
* \param -
* \return The address of the cursor as an \b unsigned \b char.
* \hideinitializer
*/
#define LCD_GET_ADDR() (lcd_rd_reg(INST_REG) & 0x7f)
/*****************************************************************************
*
* Public Function Prototypes
*
*****************************************************************************/
/**
* Lcd module initialisation function.
* Initialises hardware and the HD44780 LCD display controller for 4 bit
* operation.
* \param -
* \return -
*/
extern void lcd_init(void);
/**
* Lcd module audible alert.
* Generates a variable length tone suitable for keyboard feedback and
* ^g bell alerts.
* \param count The number of on/ off cycles to emit as an \b unsigned \b char.
* \return -
*/
extern void lcd_beep(unsigned char count);
extern void lcd_clear(void);
/*****************************************************************************
*
* Public Function Implementation
*
*****************************************************************************/
/*****************************************************************************
*
* init_lcd()
*
*****************************************************************************/
void lcd_init(void)
{
delay_ms(15); // Wait more than 15ms
LCD_PORT = 0x03; // Startup Sequence
lcd_clock_E();
delay_ms(5); // Wait more than 4.1ms
lcd_clock_E();
delay_ms(1); // Wait more than 0.1ms
lcd_clock_E();
LCD_PORT = 0x02;
lcd_clock_E();
delay_ms(1); // Wait more than 0.1ms
lcd_wr_reg(INST_REG,0x28); // Function Set
// DL=0 4bit, N=1 2Line, F=0 5x7
lcd_wr_reg(INST_REG,0x0c); // Display on/off control
// D=1 Disp on, C=0 Curs off, B=0 Blink off
lcd_wr_reg(INST_REG,0x06); // Entry Mode Set
// I/D=1 Increment, S=0 No shift
lcd_wr_reg(INST_REG,0x01); // Clear Display
delay_ms(2); // Wait more than 1.64ms
}
/*****************************************************************************
*
* putchar()
*
*****************************************************************************/
char putchar(char c)
{
switch(c)
{
case '\n': // Newline
{
if (LCD_GET_ADDR() >= LINE2_ADDR) // already in line 2 ?
{
lcd_scroll_up();
}
LCD_SET_ADDR(LINE2_ADDR);
break;
}
case '\a': // Bell (alert)
{
lcd_beep(50);
break;
}
case '\b': // Backspace
{
lcd_backspace();
break;
}
case '\f': // Form feed
{
lcd_clear();
break;
}
default:
{
lcd_wr_reg(DATA_REG, c);
}
}
return (c);
}
Such a big and complex program for a simple requirement......................
COMSIS....... when you ask for help please tell the complete specification of your requirement such as Type of lcd (16*2,8*2,......)
your lcd config need (8 bit or 4 bit) etc so that it is easy for everyone to help you quickly rather than asking you more and more questions to find out your requirement
---------- Post added at 16:42 ---------- Previous post was at 16:39 ----------
these programs are already put in some threads earlier. do a search in this forum for your requirement and last if you dont find it then start a new thread
I am professional LCD engineer for some years and I have a lot of LCD Program and LCD datasheet. If any worldwide friends needed, I would like to email you as soon as possible. Pls. email me firstly. Thanks. My Email address is Ken@e-shinedisplay.comwww.e-shinedisplay.com
---------- Post added at 20:53 ---------- Previous post was at 20:49 ----------
I am professional LCD engineer for some years and I have a lot of LCD Program and LCD datasheet. If any worldwide friends needed, I would like to email you as soon as possible. Pls. email me firstly. Thanks. My Email address is Ken@e-shinedisplay.comwww.e-shinedisplay.com
---------- Post added at 20:53 ---------- Previous post was at 20:49 ----------
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