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mija |
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/* mija 2008 |
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source file for lcd HITACHI 16x2,8x2,... |
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!!! must be set PINs,PORTs,DDR in lcd.h |
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ver.: 0.0 TESTED |
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*/ |
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#include <avr/io.h> |
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#include <util/delay.h> |
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#include <avr/pgmspace.h> |
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#include "lcd.h" |
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#include <stdio.h> |
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//************************************************************* |
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#define H_D0 PORT_D0 |=_BV(PIN_D0) |
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#define L_D0 PORT_D0 &= ~(_BV(PIN_D0)) |
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#define H_D1 PORT_D1 |=_BV(PIN_D1) |
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#define L_D1 PORT_D1 &= ~(_BV(PIN_D1)) |
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#define H_D2 PORT_D2 |=_BV(PIN_D2) |
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#define L_D2 PORT_D2 &= ~(_BV(PIN_D2)) |
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#define H_D3 PORT_D3 |=_BV(PIN_D3) |
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#define L_D3 PORT_D3 &= ~(_BV(PIN_D3)) |
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#define H_E PORT_E |=_BV(PIN_E) |
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#define L_E PORT_E &= ~(_BV(PIN_E)) |
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#define H_RS PORT_RS |=_BV(PIN_RS) |
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#define L_RS PORT_RS &= ~(_BV(PIN_RS)) |
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//************************************************************* |
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// Definice konstant pro LCD display |
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// |
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#define LCD_CURSOR_ON_ 0x0E // kurzor jako blikajici radka pod znakem |
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#define LCD_CURSOR_OFF_ 0x0C // zadny kurzor |
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#define LCD_LINE_2 0x40 // adresa 1. znaku 2. radky |
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// Definice rezimu LCD displeje |
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// |
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uint8_t PROGMEM LCD_INIT_STRING[4] = |
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{ |
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0x28, // intrfejs 4 bity, 2 radky, font 5x7 |
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LCD_CURSOR_OFF_, // display on, kurzor off, |
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0x01, // clear displeje |
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0x06 // inkrement pozice kurzoru (posun kurzoru doprava) |
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}; |
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void LCD_init_IO_PIN(void) |
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{ |
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DDR_D0 |= _BV(PIN_D0); |
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DDR_D1 |= _BV(PIN_D1); |
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DDR_D2 |= _BV(PIN_D2); |
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DDR_D3 |= _BV(PIN_D3); |
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DDR_E |= _BV(PIN_E); |
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DDR_RS |= _BV(PIN_RS); |
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} |
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void LCD_init(void) |
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{ |
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uint8_t a; |
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LCD_init_IO_PIN(); |
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_delay_ms(20); |
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L_E; |
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L_RS; |
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for (a=0;a<3;a++) |
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{ |
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_delay_ms(2); |
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LCD_send_nibble(0x3); |
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} |
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_delay_us(40); |
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LCD_send_nibble(0x2); |
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_delay_us(40); |
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for (a=0;a<3;a++) |
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{ |
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LCD_send_command(pgm_read_byte(&(LCD_INIT_STRING[a]))); |
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_delay_ms(2); |
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} |
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} |
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void LCD_putc(uint8_t data) |
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{ |
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LCD_send_data(data); |
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} |
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void LCD_send_command(uint8_t data) |
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{ |
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L_RS; |
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LCD_send(data); |
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H_RS; |
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} |
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void LCD_send_data(uint8_t data) |
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{ |
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H_RS; |
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LCD_send(data); |
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} |
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void LCD_send(uint8_t data) |
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{ |
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LCD_send_nibble(data >> 4); |
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LCD_send_nibble(data); |
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_delay_us(40); |
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} |
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void LCD_send_nibble(uint8_t data) |
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{ |
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L_D0;L_D1;L_D2;L_D3; |
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if (data & 0x1) H_D0; |
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if (data & 0x2) H_D1; |
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if (data & 0x4) H_D2; |
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if (data & 0x8) H_D3; |
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H_E; |
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_delay_us(1); |
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L_E; |
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} |
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void LCD_clear(void) |
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{ |
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LCD_send_command(1); |
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_delay_ms(2); |
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} |
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void LCD_gotoxy( uint8_t x, uint8_t y) |
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{ |
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uint8_t Adr; |
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Adr=x-1; |
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if(y==2) |
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Adr+=LCD_LINE_2; |
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LCD_send_command(0x80|Adr); |
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} |