// flex_lcd_2.c
//#define LCD_DB4 PIN_B4
//#define LCD_DB5 PIN_B5
//#define LCD_DB6 PIN_B6
//#define LCD_DB7 PIN_B7
//
//#define LCD_RS PIN_C0
//#define LCD_RW PIN_C1
//#define LCD_E PIN_C2
// If you only want a 6-pin interface to your LCD, then
// connect the R/W pin on the LCD to ground, and comment
// out the following line.
// #define USE_LCD_RW 1
//========================================
#define lcd_type 2 // 0=5x7, 1=5x10, 2=2 lines
#define lcd_line_two 0x40 // LCD RAM address for the 2nd line
int8 const LCD_INIT_STRING[4] =
{
0x20 | (lcd_type << 2), // Func set: 4-bit, 2 lines, 5x8 dots
0xc, // Display on
1, // Clear display
6 // Increment cursor
};
//-------------------------------------
void lcd_send_nibble(int8 nibble){
// Note: !! converts an integer expression
// to a boolean (1 or 0).
output_bit(LCD_DB4, !!(nibble & 1));
output_bit(LCD_DB5, !!(nibble & 2));
output_bit(LCD_DB6, !!(nibble & 4));
output_bit(LCD_DB7, !!(nibble & 8));
delay_cycles(1);
output_high(LCD_E);
delay_us(2);
output_low(LCD_E);
}
//-----------------------------------
// This sub-routine is only called by lcd_read_byte().
// It's not a stand-alone routine. For example, the
// R/W signal is set high by lcd_read_byte() before
// this routine is called.
#ifdef USE_LCD_RW
int8 lcd_read_nibble(void){
int8 retval;
// Create bit variables so that we can easily set
// individual bits in the retval variable.
#bit retval_0 = retval.0
#bit retval_1 = retval.1
#bit retval_2 = retval.2
#bit retval_3 = retval.3
retval = 0;
output_high(LCD_E);
delay_cycles(1);
retval_0 = input(LCD_DB4);
retval_1 = input(LCD_DB5);
retval_2 = input(LCD_DB6);
retval_3 = input(LCD_DB7);
output_low(LCD_E);
return(retval);
}
#endif
//---------------------------------------
// Read a byte from the LCD and return it.
#ifdef USE_LCD_RW
int8 lcd_read_byte(void){
int8 low;
int8 high;
output_high(LCD_RW);
delay_cycles(1);
high = lcd_read_nibble();
low = lcd_read_nibble();
return( (high<<4) | low);
}
#endif
//----------------------------------------
// Send a byte to the LCD.
void lcd_send_byte(int8 address, int8 n){
output_low(LCD_RS);
#ifdef USE_LCD_RW
while(bit_test(lcd_read_byte(),7)) ;
#else
delay_us(60);
#endif
if(address)
output_high(LCD_RS);
else
output_low(LCD_RS);
delay_cycles(1);
#ifdef USE_LCD_RW
output_low(LCD_RW);
delay_cycles(1);
#endif
output_low(LCD_E);
lcd_send_nibble(n >> 4);
lcd_send_nibble(n & 0xf);
}
//----------------------------
void lcd_init(void){
int8 i;
output_low(LCD_RS);
#ifdef USE_LCD_RW
output_low(LCD_RW);
#endif
output_low(LCD_E);
delay_ms(15);
for(i=0 ;i < 3; i++)
{
lcd_send_nibble(0x03);
delay_ms(5);
}
lcd_send_nibble(0x02);
for(i=0; i < sizeof(LCD_INIT_STRING); i++)
{
lcd_send_byte(0, LCD_INIT_STRING[i]);
// If the R/W signal is not used, then
// the busy bit can't be polled. One of
// the init commands takes longer than
// the hard-coded delay of 60 us, so in
// that case, lets just do a 5 ms delay
// after all four of them.
#ifndef USE_LCD_RW
delay_ms(5);
#endif
}
delay_ms(15);
}
//----------------------------
// Posiciones válidas:
// de x=1 a x=16 y
// de y=1 a y=2
void lcd_gotoxy(int8 x, int8 y){
int8 address;
if(x > 0 && y > 0){
if(y > 1)
address = lcd_line_two;
else
address=0;
address += x-1;
lcd_send_byte(0, 0x80 | address); // Manda cursor a la posición
}
}
//-----------------------------
void lcd_putc(char c)
{
/*' LCD
' Command Operation
' *********** *****************************************
' $FE, 1 Clear display
' $FE, 2 Return home
' $FE, $0C Cursor off
' $FE, $0E Underline cursor on
' $FE, $0F Blinking cursor on
' $FE, $10 Move cursor left one position
' $FE, $14 Move cursor right one position
' $FE, $80 Move cursor to beginning of first line
' $FE, $C0 Move cursor to beginning of second line
' *********** ***************************************** */
if(c>'\0'){
switch(c){
case '\f':
lcd_send_byte(0,1);
lcd_send_byte(0,2);
delay_ms(2);
break;
case '\n':
lcd_gotoxy(1,2);
delay_ms(2);
break;
case '\b':
lcd_send_byte(0,0x10);
delay_ms(2);
break;
case '\t':
lcd_send_byte(0,0x14);
delay_ms(2);
break;
default:
lcd_send_byte(1,c);
delay_ms(2);
break;
}
}
}
//------------------------------
void lcd_put_string(char *string){
//put string, starting from the curren cursor position
//assume that string not excides from lcd displayed RAM
char index=0;
while(string[index]!=0){
lcd_putc(string[index++]);
}
}
//------------------------------
void lcd_put_string_xy(char *string, char x, char y){
//assume that string not excides from lcd displayed RAM
lcd_gotoxy(x,y);
lcd_put_string(string);
}
//------------------------------
#ifdef USE_LCD_RW
char lcd_getc(int8 x, int8 y)
{
char value;
lcd_gotoxy(x,y);
// Wait until busy flag is low.
while(bit_test(lcd_read_byte(),7));
output_high(LCD_RS);
value = lcd_read_byte();
output_low(lcd_RS);
return(value);
}
#endif
//------------------------------
void lcd_setcursor(short visible, short blink) {
lcd_send_byte(0, 0xC|(visible<<1)|blink);
}
