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 <avr/pgmspace.h>
  16 #include <inttypes.h>
  17 #define F_CPU 8000000UL  // 8 MHz
  18 #include <util/delay.h>
  19 #include "dac.h"
  20 #include "lcd.h"
  21 #include "kbd.h"
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 //debug LED:
  26 // set output to VCC, red LED off
  27 #define LEDOFF PORTD|=(1<<PORTD0)
  28 // set output to GND, red LED on
  29 #define LEDON PORTD&=~(1<<PORTD0)
  30 // to test the state of the LED
  31 #define LEDISOFF PORTD&(1<<PORTD0)
  32
  33 void delay_ms(uint16_t ms)
  34 /* delay for a minimum of <ms> */
  35 {
  36         // we use a calibrated macro. This is more
  37         // accurate and not so much compiler dependent
  38         // as self made code.
  39         while(ms){
  40                 _delay_ms(0.96);
  41                 ms--;
  42         }
  43 }
  44
  45
  46 int main(void)
  47 {
  48         int16_t dac_val=511;
  49         int16_t cnt;
  50         int8_t dac_dir=0;
  51         char out_buf[21];
  52         DDRD|= (1<<DDD0); // LED, enable PD0, LED as output
  53         LEDOFF;
  54         init_dac();
  55         lcd_init();
  56         lcd_clrscr();
  57         lcd_puts("use U+/U-");
  58         lcd_gotoxy(0,1);
  59         lcd_puts("and store");
  60         init_kbd();
  61         delay_ms(500);
  62         delay_ms(500);
  63         lcd_clrscr();
  64         lcd_puts_p(PSTR("pause"));
  65         while (1) {
  66                 if (dac_dir==1){
  67                         dac_val++;
  68                 }
  69                 if (dac_dir==-1){
  70                         dac_val--;
  71                 }
  72                 if (dac_val>0xFFF){
  73                         dac_val=0xFFF; //max, 13bit
  74                 }
  75                 if (dac_val<0){
  76                         dac_val=0;
  77                 }
  78                 lcd_gotoxy(0,1);
  79                 itoa(dac_val,out_buf,10);
  80                 lcd_puts(out_buf);
  81                 lcd_puts("    ");
  82                 dac(dac_val);
  83                 cnt=1;
  84                 check_u_button(&cnt);
  85                 if (cnt>1){
  86                         lcd_clrscr();
  87                         // u+ pressed
  88                         lcd_puts_p(PSTR("up"));
  89                         dac_dir=1;
  90                         LEDOFF;
  91                 }
  92                 if (cnt<1){
  93                         lcd_clrscr();
  94                         // u- pressed
  95                         lcd_puts_p(PSTR("down"));
  96                         dac_dir=-1;
  97                         LEDON;
  98                 }
  99                 if (check_store_button()){
 100                         lcd_clrscr();
 101                         lcd_puts_p(PSTR("pause"));
 102                         dac_dir=0;
 103                 }
 104                 delay_ms(100);
 105                 cnt=1;
 106                 check_u_button(&cnt);
 107                 if (cnt>1){
 108                         lcd_clrscr();
 109                         // u+ pressed
 110                         lcd_puts_p(PSTR("up"));
 111                         dac_dir=1;
 112                         LEDOFF;
 113                 }
 114                 if (cnt<1){
 115                         lcd_clrscr();
 116                         // u- pressed
 117                         lcd_puts_p(PSTR("down"));
 118                         dac_dir=-1;
 119                         LEDON;
 120                 }
 121                 if (check_store_button()){
 122                         lcd_clrscr();
 123                         lcd_puts_p(PSTR("pause"));
 124                         dac_dir=0;
 125                 }
 126                 delay_ms(100);
 127         }
 128         return(0);
 129 }