git.rot13.org Git - simavr/blob - examples/board_hd77480/atmega48_charlcd.c

   1 /*
   2         atmega48_charlcd.c
   3
   4         Copyright Luki <humbell@ethz.ch>
   5         Copyright 2011 Michel Pollet <buserror@gmail.com>
   6
   7         This file is part of simavr.
   8
   9         simavr is free software: you can redistribute it and/or modify
  10         it under the terms of the GNU General Public License as published by
  11         the Free Software Foundation, either version 3 of the License, or
  12         (at your option) any later version.
  13
  14         simavr is distributed in the hope that it will be useful,
  15         but WITHOUT ANY WARRANTY; without even the implied warranty of
  16         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17         GNU General Public License for more details.
  18
  19         You should have received a copy of the GNU General Public License
  20         along with simavr.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #undef F_CPU
  24 #define F_CPU 10000000
  25
  26 #include <avr/io.h>
  27 #include <avr/interrupt.h>
  28 #include <util/delay.h>
  29 #include <avr/sleep.h>
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <string.h>
  33
  34 //#include "avr_defines.h"
  35
  36 #include "avr_mcu_section.h"
  37 AVR_MCU(F_CPU, "atmega48");
  38
  39 static uint8_t subsecct = 0;
  40 static uint8_t hour = 0;
  41 static uint8_t minute = 0;
  42 static uint8_t second = 0;
  43 static volatile uint8_t update_needed = 0;
  44
  45 #include "avr_hd44780.c"
  46
  47 ISR( INT0_vect )
  48 {
  49         /* External interrupt on pin D2 */
  50         subsecct++;
  51         if (subsecct == 50) {
  52                 second++;
  53                 subsecct = 0;
  54                 update_needed = 1;
  55                 if (second == 60) {
  56                         minute++;
  57                         second = 0;
  58                         if (minute == 60) {
  59                                 minute = 0;
  60                                 hour++;
  61                                 if (hour == 24)
  62                                         hour = 0;
  63                         }
  64                 }
  65         }
  66 }
  67
  68 int main()
  69 {
  70         hd44780_init();
  71         /*
  72          * Clear the display.
  73          */
  74         hd44780_outcmd(HD44780_CLR);
  75         hd44780_wait_ready(1); // long wait
  76
  77         /*
  78          * Entry mode: auto-increment address counter, no display shift in
  79          * effect.
  80          */
  81         hd44780_outcmd(HD44780_ENTMODE(1, 0));
  82         hd44780_wait_ready(0);
  83
  84         /*
  85          * Enable display, activate non-blinking cursor.
  86          */
  87         hd44780_outcmd(HD44780_DISPCTL(1, 1, 0));
  88         hd44780_wait_ready(0);
  89
  90         EICRA = (1 << ISC00);
  91         EIMSK = (1 << INT0);
  92
  93         sei();
  94
  95         while (1) {
  96                 while (!update_needed)
  97                         sleep_mode();
  98                 update_needed = 0;
  99                 char buffer[16];
 100
 101                 hd44780_outcmd(HD44780_CLR);
 102                 hd44780_wait_ready(1); // long wait
 103                 hd44780_outcmd(HD44780_DDADDR(4));
 104                 hd44780_wait_ready(0);
 105                 sprintf(buffer, "%2d:%02d:%02d", hour, minute, second);
 106
 107                 char *s = buffer;
 108                 while (*s) {
 109                         hd44780_outdata(*s++);
 110                         hd44780_wait_ready(0);
 111                 }
 112         }
 113
 114 }