void lcd_init( void )
{
LCD_DDR_D4 = 1; // enable output pins
LCD_DDR_D5 = 1;
LCD_DDR_D6 = 1;
LCD_DDR_D7 = 1;
LCD_DDR_RS = 1;
LCD_DDR_E0 = 1;
LCD_E0 = 0;
LCD_RS = 0; // send commands
_delay_ms( 15 );
lcd_nibble( 0x30 );
_delay_ms( 4.1 );
lcd_nibble( 0x30 );
_delay_us( 100 );
lcd_nibble( 0x30 );
_delay_us( LCD_TIME_DAT );
lcd_nibble( 0x20 ); // 4 bit mode
_delay_us( LCD_TIME_DAT );
#if LCD_LINE == 1
lcd_command( 0x20 ); // 1 line
#else
lcd_command( 0x28 ); // 2 lines 5*7
#endif
lcd_command( 0x08 ); // display off
lcd_command( 0x01 ); // display clear
lcd_command( 0x06 ); // cursor increment
lcd_command( 0x0C ); // on, no cursor, no blink
}
void lcd_send_instr(unsigned char data) {
lcd_e(0);
lcd_rs(0); // wysy³amy instrukcjê
// starszy nibble 0xF-
lcd_e(1);
lcd_nibble( data >> 4 );
lcd_e(0);
_delay_us(50);_delay_us(50);
// m³odszy nibble 0x-F
lcd_e(1);
lcd_nibble( data & 0x0f);
lcd_e(0);
_delay_us(50);_delay_us(50);
}
void lcd_send_data(unsigned char data) {
lcd_e(0);
lcd_rs(1);
// starszy nibble 0xF-
lcd_e(1);
lcd_nibble( data >> 4 );
lcd_e(0);
_delay_us(50);_delay_us(50);
// m³odszy nibble 0x-F
lcd_e(1);
lcd_nibble( data & 0x0f);
lcd_e(0);
_delay_us(50);_delay_us(50);
}
static void lcd_byte( uint8_t d )
{
lcd_nibble( d );
lcd_nibble( d<<4 );
_delay_us( LCD_TIME_DAT );
}
void lcd_setup()
{
unsigned idata i=0;
LCD_E = 0;
LCD_R_W = 0;
LCD_RS = 0;
#if defined(CPU_C8051F120)
SFRPAGE = CONFIG_PAGE;
P2MDOUT = 0xFF; // all push-pull
#if defined(SCS_2000) || defined(SCS_2001)
P1MDOUT |= 0x03;
LCD_1D = 1; // a to b for data
LCD_2D = 1; // a to b for control
#endif
#else
PRT2CF = 0xFF; // all push-pull
#endif
#if defined(SCS_900) || defined(SCS_1001) || defined(SCS_2000) || defined(SCS_2001)
// 4-line LCD display with KS0078 controller
LCD &= ~(0xFE);
LCD |= 0x20; // set 4-bit interface
LCD_E = 1;
delay_us(1);
LCD_E = 0;
delay_ms(1);
lcd_nibble(0x20); // function set: 4-bit, RE=0
// test if LCD present
LCD = LCD | 0xF0; // data input
#if defined(CPU_C8051F120)
SFRPAGE = CONFIG_PAGE;
#if defined(SCS_2000) || defined(SCS_2001)
P2MDOUT |= 0x0F;
LCD_1D = 0; // b to a for data
#else
P2MDOUT = 0x0F;
#endif
#else
PRT2CF = 0x0F;
#endif
LCD_RS = 0; // select BF
LCD_R_W = 1;
delay_us(1);
LCD_E = 1;
delay_us(100); // let signal settle
if (LCD_DB7) {
lcd_present = 0;
return;
}
lcd_present = 1;
lcd_out(0x24, 0); // function set: 4-bit, RE=1
lcd_out(0x0B, 0); // ext function set: 4-line display, inverting cursor
lcd_out(0x20, 0); // function set: 4-bit, RE=0
lcd_out(0x0C, 0); // display on
lcd_out(0x01, 0); // clear display
lcd_out(0x06, 0); // entry mode: incrementing
#else // 2-line LCD display with KS0066 controller
LCD &= ~(0xFE);
delay_ms(15);
LCD |= 0x30;
LCD_E = 1;
delay_us(1);
LCD_E = 0;
delay_ms(5);
LCD_E = 1;
delay_us(1);
LCD_E = 0;
delay_ms(1);
LCD_E = 1;
delay_us(1);
LCD_E = 0;
LCD = 0x20; // set 4-bit interface
LCD_E = 1;
delay_us(1);
LCD_E = 0;
// test if LCD present
LCD = LCD | 0xF0; // data input
#if defined(CPU_C8051F120)
SFRPAGE = CONFIG_PAGE;
P2MDOUT = 0x0F;
#else
PRT2CF = 0x0F;
#endif
LCD_RS = 0; // select BF
LCD_R_W = 1;
delay_us(1);
LCD_E = 1;
delay_us(100); // let signal settle
if (LCD_DB7) {
lcd_present = 0;
return;
}
lcd_present = 1;
lcd_out(0x2C, 0); // select 2 lines, big font
lcd_out(0x0C, 0); // display on
lcd_out(0x01, 0); // clear display
lcd_out(0x06, 0); // entry mode
#endif
}