git.rot13.org Git - digitaldcpower/blob - test_dac.c

   1 /*********************************************
   2 * vim: set sw=8 ts=8 si :
   3 * Author: Guido Socher, Copyright: GPL
   4 * This is a test program which will write "LCD works"
   5 * on the LCD display.
   6 * This program is also used to test the keypad. It
   7 * displays the button last pressed.
   8 *
   9 * See http://www.tuxgraphics.org/electronics/
  10 *
  11 * Chip type           : ATMEGA8
  12 * Clock frequency     : Internal clock 8 Mhz
  13 *********************************************/
  14 #include <avr/io.h>
  15 #include <inttypes.h>
  16 #define F_CPU 8000000UL  // 8 MHz
  17 #include <util/delay.h>
  18 #include "dac.h"
  19 #include "lcd.h"
  20 #include "kbd.h"
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 //debug LED:
  25 // set output to VCC, red LED off
  26 #define LEDOFF PORTD|=(1<<PORTD0)
  27 // set output to GND, red LED on
  28 #define LEDON PORTD&=~(1<<PORTD0)
  29 // to test the state of the LED
  30 #define LEDISOFF PORTD&(1<<PORTD0)
  31
  32 void delay_ms(uint16_t ms)
  33 /* delay for a minimum of <ms> */
  34 {
  35         // we use a calibrated macro. This is more
  36         // accurate and not so much compiler dependent
  37         // as self made code.
  38         while(ms){
  39                 _delay_ms(0.96);
  40                 ms--;
  41         }
  42 }
  43
  44
  45 int main(void)
  46 {
  47         int16_t dac_val=511;
  48         int16_t cnt;
  49         int8_t dac_dir=0;
  50         char out_buf[21];
  51         DDRD|= (1<<DDD0); // LED, enable PD0, LED as output
  52         LEDOFF;
  53         init_dac();
  54         lcd_init();
  55         lcd_clrscr();
  56         lcd_puts("use U+/U-");
  57         lcd_gotoxy(0,1);
  58         lcd_puts("and store");
  59         init_kbd();
  60         delay_ms(500);
  61         delay_ms(500);
  62         lcd_clrscr();
  63         lcd_puts_P("pause");
  64         while (1) {
  65                 if (dac_dir==1){
  66                         dac_val++;
  67                 }
  68                 if (dac_dir==-1){
  69                         dac_val--;
  70                 }
  71                 if (dac_val>0xFFF){
  72                         dac_val=0xFFF; //max, 13bit
  73                 }
  74                 if (dac_val<0){
  75                         dac_val=0;
  76                 }
  77                 lcd_gotoxy(0,1);
  78                 itoa(dac_val,out_buf,10);
  79                 lcd_puts(out_buf);
  80                 lcd_puts("    ");
  81                 dac(dac_val);
  82                 cnt=1;
  83                 check_u_button(&cnt);
  84                 if (cnt>1){
  85                         lcd_clrscr();
  86                         // u+ pressed
  87                         lcd_puts_P("up");
  88                         dac_dir=1;
  89                         LEDOFF;
  90                 }
  91                 if (cnt<1){
  92                         lcd_clrscr();
  93                         // u- pressed
  94                         lcd_puts_P("down");
  95                         dac_dir=-1;
  96                         LEDON;
  97                 }
  98                 if (check_store_button()){
  99                         lcd_clrscr();
 100                         lcd_puts_P("pause");
 101                         dac_dir=0;
 102                 }
 103                 delay_ms(100);
 104                 cnt=1;
 105                 check_u_button(&cnt);
 106                 if (cnt>1){
 107                         lcd_clrscr();
 108                         // u+ pressed
 109                         lcd_puts_P("up");
 110                         dac_dir=1;
 111                         LEDOFF;
 112                 }
 113                 if (cnt<1){
 114                         lcd_clrscr();
 115                         // u- pressed
 116                         lcd_puts_P("down");
 117                         dac_dir=-1;
 118                         LEDON;
 119                 }
 120                 if (check_store_button()){
 121                         lcd_clrscr();
 122                         lcd_puts_P("pause");
 123                         dac_dir=0;
 124                 }
 125                 delay_ms(100);
 126         }
 127         return(0);
 128 }