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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ch.h"
#include "hal.h"
#include "lcd.h"
static void e_pulse(void) {
volatile uint8_t i;
PORTC |= PORTC_44780_E;
for (i = 0; i < ELOOPVALUE; i++);
;
PORTC &= ~PORTC_44780_E;
}
static void wait_not_busy(void) {
chThdSleep(2);
}
/*
* 44780 soft reset procedure.
*/
void lcdInit(void) {
PORTC = (PORTC & ~(PORTC_44780_DATA | PORTC_44780_RS | PORTC_44780_E | PORTC_44780_RW)) |
(LCD_CMD_INIT8 & PORTC_44780_DATA);
chThdSleep(50);
e_pulse();
chThdSleep(10);
e_pulse();
chThdSleep(2);
e_pulse();
wait_not_busy();
PORTC = (PORTC & ~(PORTC_44780_DATA | PORTC_44780_RS | PORTC_44780_E | PORTC_44780_RW)) |
(LCD_CMD_INIT4 & PORTC_44780_DATA);
e_pulse();
lcdCmd(LCD_CMD_INIT4);
lcdCmd(LCD_SET_DM | LCD_DM_DISPLAY_ON);
lcdCmd(LCD_SET_INCREMENT_MODE);
}
/*
* Sends a command byte to the 44780.
*/
void lcdCmd(uint8_t cmd) {
wait_not_busy();
PORTC = (PORTC | PORTC_44780_DATA) & (cmd | (0x0F & ~PORTC_44780_RS));
e_pulse();
PORTC = (PORTC | PORTC_44780_DATA) & ((cmd << 4) | (0x0F & ~PORTC_44780_RS));
e_pulse();
}
/*
* Writes a char on the LCD at the current position.
*/
void lcdPutc(char c) {
uint8_t b;
wait_not_busy();
b = c | 0x0F;
PORTC = (PORTC | PORTC_44780_DATA | PORTC_44780_RS) & (c | 0x0F);
e_pulse();
PORTC = (PORTC | PORTC_44780_DATA | PORTC_44780_RS) & ((c << 4) | 0x0F);
e_pulse();
}
/*
* Writes a string on the LCD at an absolute address.
*/
void lcdPuts(uint8_t pos, char *p) {
lcdCmd(LCD_SET_DDRAM_ADDRESS | pos);
while (*p)
lcdPutc(*p++);
}
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