firmware/buttons.c

   1 #include <avr/io.h>
   2 #include <avr/interrupt.h>
   3 #include <avr/sleep.h>
   4 #include <util/delay.h>
   5
   6 #include "lights.h"
   7
   8 static uint16_t button_start[N_BUTTONS];
   9 static unsigned char button_pressed[N_BUTTONS];
  10 static unsigned char just_waked_up;
  11
  12 void init_buttons()
  13 {
  14         unsigned char i;
  15
  16         DDRB &= ~(_BV(PB4) | _BV(PB6));
  17         PORTB |=  _BV(PB4) | _BV(PB6);
  18
  19         for (i=0; i < N_BUTTONS; i++) {
  20                 button_start[i] = 0;
  21                 button_pressed[i] = 0;
  22         }
  23
  24         just_waked_up = 1;
  25
  26         // log_byte(PORTB);
  27 }
  28
  29 static void do_sleep()
  30 {
  31         log_byte(0xb0);
  32         log_flush();
  33
  34         hw_suspend();
  35         gpio_before_poweroff(); // Set the status LED on again
  36
  37         while((PINB & _BV(PB6)) == 0)
  38                 ; // wait for button release
  39
  40         _delay_ms(100);
  41
  42         susp_gpio(); // disable the status LED
  43
  44         power_down();
  45 }
  46
  47 static void inline long_press(unsigned char n)
  48 {
  49         if (n == 0)
  50                 do_sleep();
  51 }
  52
  53 static void inline short_press(unsigned char n)
  54 {
  55         if (n == 0)
  56                 gpio_set(2,1);
  57 }
  58
  59 void timer_check_buttons()
  60 {
  61         unsigned char pinb = PINB;
  62         unsigned char i;
  63         unsigned char port_states[N_BUTTONS] = {
  64                 pinb & _BV(PB6),
  65                 pinb & _BV(PB4),
  66         };
  67
  68         for (i = 0; i < N_BUTTONS; i++) {
  69                 if (!port_states[i]) { // is pressed
  70                         if (i == 0 && just_waked_up)
  71                                 continue;
  72                         if (button_pressed[i] == 0) {
  73                                 // begin of button press
  74                                 button_pressed[i] = 1;
  75                                 button_start[i] = jiffies;
  76 #if 0
  77                                 log_byte(0xC0);
  78                                 log_word(jiffies);
  79 #endif
  80                         } else if (button_pressed[i] == 1) {
  81                                 // been already pressed
  82                                 uint16_t duration = jiffies - button_start[i];
  83                                 if (duration > 80) {
  84                                         // long button press
  85                                         button_pressed[i] = 2;
  86                                         long_press(i);
  87                                 }
  88                         }
  89                 } else { // is not pressed
  90                         if (i == 0)
  91                                 just_waked_up = 0;
  92                         if (button_pressed[i]) { // just depressed
  93                                 uint16_t duration = jiffies - button_start[i];
  94 #if 1
  95                                 log_byte(0xC1);
  96                                 log_word(duration);
  97                                 log_flush();
  98 #endif
  99                                 button_pressed[i] = 0;
 100                                 if (duration > 6 && duration < 30)
 101                                         short_press(i);
 102                         }
 103                 }
 104         }
 105 }
 106