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92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
4 years ago
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/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <joerg@FreeBSD.ORG> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Joerg Wunsch
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* ----------------------------------------------------------------------------
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*
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* Stdio demo, upper layer of LCD driver.
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*
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* $Id$
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*/
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#include "defines.h"
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include "hd44780.h"
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#include "lcd.h"
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/*
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* Setup the LCD controller. First, call the hardware initialization
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* function, then adjust the display attributes we want.
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*/
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void
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lcd_init(void)
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{
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hd44780_init();
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/*
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* Clear the display.
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*/
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hd44780_outcmd(HD44780_CLR);
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hd44780_wait_ready(true);
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/*
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* Entry mode: auto-increment address counter, no display shift in
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* effect.
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*/
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hd44780_outcmd(HD44780_ENTMODE(1, 0));
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hd44780_wait_ready(false);
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/*
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* Enable display, activate non-blinking cursor.
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*/
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hd44780_outcmd(HD44780_DISPCTL(1, 1, 0));
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hd44780_wait_ready(false);
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}
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/*
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* Send character c to the LCD display. After a '\n' has been seen,
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* the next character will first clear the display.
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*/
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int
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lcd_putchar(char c, FILE *unused)
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{
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static bool nl_seen;
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if (nl_seen && c != '\n')
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{
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/*
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* First character after newline, clear display and home cursor.
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*/
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hd44780_wait_ready(false);
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hd44780_outcmd(HD44780_CLR);
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hd44780_wait_ready(false);
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hd44780_outcmd(HD44780_HOME);
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hd44780_wait_ready(true);
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hd44780_outcmd(HD44780_DDADDR(0));
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nl_seen = false;
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}
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if (c == '\n')
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{
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nl_seen = true;
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}
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else
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{
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hd44780_wait_ready(false);
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hd44780_outdata(c);
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}
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return 0;
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}
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