board_hd44780: New sample code

[simavr] / examples / board_hd77480 / atmega48_charlcd.c

diff --git a/examples/board_hd77480/atmega48_charlcd.c b/examples/board_hd77480/atmega48_charlcd.c
new file mode 100644 (file)
index 0000000..95c1e96
--- /dev/null
+++ b/examples/board_hd77480/atmega48_charlcd.c
@@ -0,0 +1,114 @@
+/*
+       atmega48_charlcd.c
+
+       Copyright Luki <humbell@ethz.ch>
+       Copyright 2011 Michel Pollet <buserror@gmail.com>
+
+       This file is part of simavr.
+
+       simavr 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.
+
+       simavr 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 simavr.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#undef F_CPU
+#define F_CPU 10000000
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <avr/sleep.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+//#include "avr_defines.h"
+
+#include "avr_mcu_section.h"
+AVR_MCU(F_CPU, "atmega48");
+
+static uint8_t subsecct = 0;
+static uint8_t hour = 0;
+static uint8_t minute = 0;
+static uint8_t second = 0;
+static volatile uint8_t update_needed = 0;
+
+#include "avr_hd44780.c"
+
+ISR( INT0_vect )
+{
+       /* External interrupt on pin D2 */
+       subsecct++;
+       if (subsecct == 50) {
+               second++;
+               subsecct = 0;
+               update_needed = 1;
+               if (second == 60) {
+                       minute++;
+                       second = 0;
+                       if (minute == 60) {
+                               minute = 0;
+                               hour++;
+                               if (hour == 24)
+                                       hour = 0;
+                       }
+               }
+       }
+}
+
+int main()
+{
+       hd44780_init();
+       /*
+        * Clear the display.
+        */
+       hd44780_outcmd(HD44780_CLR);
+       hd44780_wait_ready(1); // long wait
+
+       /*
+        * Entry mode: auto-increment address counter, no display shift in
+        * effect.
+        */
+       hd44780_outcmd(HD44780_ENTMODE(1, 0));
+       hd44780_wait_ready(0);
+
+       /*
+        * Enable display, activate non-blinking cursor.
+        */
+       hd44780_outcmd(HD44780_DISPCTL(1, 1, 0));
+       hd44780_wait_ready(0);
+
+       EICRA = (1 << ISC00);
+       EIMSK = (1 << INT0);
+
+       sei();
+
+       while (1) {
+               while (!update_needed)
+                       sleep_mode();
+               update_needed = 0;
+               char buffer[16];
+
+               hd44780_outcmd(HD44780_CLR);
+               hd44780_wait_ready(1); // long wait
+               hd44780_outcmd(HD44780_DDADDR(4));
+               hd44780_wait_ready(0);
+               sprintf(buffer, "%2d:%02d:%02d", hour, minute, second);
+
+               char *s = buffer;
+               while (*s) {
+                       hd44780_outdata(*s++);
+                       hd44780_wait_ready(0);
+               }
+       }
+
+}