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