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lcd.c
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lcd.c
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/*
* lcd.c
*
* Created: 2011-11-29 17:01:14
* Author: pn264889
*/
#include "lcd.h"
#include <avr/delay.h>
#include "commons.h"
void lcdSend4Bits(uint8_t data)
{
SBI(LCD_E_PORT, LCD_OE);
SBI(LCD_DATA_PORT, LCD_D4);
SBI(LCD_DATA_PORT, LCD_D5);
SBI(LCD_DATA_PORT, LCD_D6);
SBI(LCD_DATA_PORT, LCD_D7);
if (!CHECK(data, 4))
CBI(LCD_DATA_PORT, LCD_D4);
if (!CHECK(data, 5))
CBI(LCD_DATA_PORT, LCD_D5);
if (!CHECK(data, 6))
CBI(LCD_DATA_PORT, LCD_D6);
if (!CHECK(data, 7))
CBI(LCD_DATA_PORT, LCD_D7);
_delay_loop_1(1); // 3+ cycles
CBI(LCD_E_PORT, LCD_OE);
}
void lcdSend4BitsMode(uint8_t data)
{
lcdSend4Bits(data);
SWAP(data);
lcdSend4Bits(data);
_delay_us(40);
}
void lcdInit()
{
// based on http://www.mimuw.edu.pl/~marpe/mikrokontrolery/w5_klawisze_lcd.pdf
// slide no. 26
// set input/output direction
SBI(LCD_DATA_DDR, LCD_D4);
SBI(LCD_DATA_DDR, LCD_D5);
SBI(LCD_DATA_DDR, LCD_D6);
SBI(LCD_DATA_DDR, LCD_D7);
SBI(LCD_E_DDR, LCD_OE);
SBI(LCD_RS_DDR, LCD_RS);
CBI(LCD_RS_PORT, LCD_RS);
CBI(LCD_E_PORT, LCD_OE);
_delay_ms(40);
SBI(LCD_E_PORT, LCD_OE);
SBI(LCD_DATA_PORT, LCD_D4);
SBI(LCD_DATA_PORT, LCD_D5);
CBI(LCD_DATA_PORT, LCD_D6);
CBI(LCD_DATA_PORT, LCD_D7);
_delay_loop_1(1); // 3+ cycles
CBI(LCD_E_PORT, LCD_OE);
_delay_ms(4.1);
SBI(LCD_E_PORT, LCD_OE);
_delay_loop_1(1); // 3+ cycles
CBI(LCD_E_PORT, LCD_OE);
_delay_us(100);
SBI(LCD_E_PORT, LCD_OE);
_delay_loop_1(1); // 3+ cycles
CBI(LCD_E_PORT, LCD_OE);
_delay_us(100);
SBI(LCD_E_PORT, LCD_OE);
CBI(LCD_DATA_PORT, LCD_D4);
_delay_loop_1(1); // 3+ cycles
CBI(LCD_E_PORT, LCD_OE);
_delay_us(100);
lcdInstr(0x28); //0b00101000
lcdInstr(0x06); //0b00000110
lcdInstr(0x0f); //0b00001111
lcdInstr(0x01); //0b00000001
_delay_ms(2);
}
//move cursor to pos position (7 bit)
void lcdGoTo(uint8_t pos)
{
lcdInstr(pos | (1<<7));
}
void lcdClear(void)
{
lcdInstr(0x01); //0b00000001
_delay_ms(3);
}
//send 8bit data to the LCD using R16 as argument
void lcdData(uint8_t data)
{
SBI(LCD_RS_PORT, LCD_RS);
lcdSend4BitsMode(data);
}
void lcdString(char* str)
{
while (*str != 0)
{
lcdData(*str);
++str;
}
}
void lcdInt(int16_t i)
{
if (i < 0)
{
lcdString("-");
i = -i;
}
lcdUint(i);
}
void lcdUint(uint16_t i)
{
int8_t log2 = 0;
int16_t tmp = i;
while (tmp > 15)
{
tmp >>= 4;
log2 += 4;
}
while (log2 >= 0)
{
int16_t div = i >> log2;
lcdData(div + (div > 9 ? 'A'- 10: '0'));
i -= div << log2;
log2 -= 4;
}
}
void lcdInstr(uint8_t instr)
{
CBI(LCD_RS_PORT, LCD_RS);
lcdSend4BitsMode(instr);
}