firmware/buttons.c

   1 #include <avr/io.h>
   2 #include <avr/interrupt.h>
   3 #include <avr/sleep.h>
   4
   5 #include "lights.h"
   6
   7 static uint16_t button_start[N_BUTTONS];
   8 static unsigned char button_pressed[N_BUTTONS];
   9
  10 static unsigned char sleep_after_release;
  11
  12 void init_buttons()
  13 {
  14         DDRB &= ~(_BV(PB4) | _BV(PB6));
  15         PORTB |=  _BV(PB4) | _BV(PB6);
  16
  17         sleep_after_release = 0;
  18         // log_byte(PORTB);
  19 }
  20
  21 static void inline long_press(unsigned char n)
  22 {
  23         sleep_after_release = 1;
  24         gpio_set(1, 1);
  25 }
  26
  27 static void do_sleep()
  28 {
  29         // led_set_status(2);
  30         // MCUCR |= _BV(ISC00); // any edge generates IRQ
  31         log_byte(0xb0);
  32         log_flush();
  33         set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  34         PORTA = 0;
  35         PORTB = 0;
  36         DDRA = 0;
  37         DDRB = 0;
  38         GIMSK |= _BV(INT0); // enable INT0
  39         sleep_enable();
  40         sei();
  41         sleep_cpu();
  42         sleep_disable();
  43         cli();
  44         GIMSK &= ~_BV(INT0); // disable INT0
  45         hw_setup();
  46 }
  47
  48 static void inline short_press(unsigned char n)
  49 {
  50         led_set_status(1);
  51 }
  52
  53 void timer_check_buttons()
  54 {
  55         unsigned char pinb = PINB;
  56         unsigned char i;
  57         unsigned char port_states[N_BUTTONS] = {
  58                 pinb & _BV(PB6),
  59                 pinb & _BV(PB4),
  60         };
  61         for (i = 0; i < N_BUTTONS; i++) {
  62                 if (!port_states[i]) { // is pressed
  63                         if (button_pressed[i] == 0) {
  64                                 // begin of button press
  65                                 button_pressed[i] = 1;
  66                                 button_start[i] = jiffies;
  67 #if 0
  68                                 // log_byte(0xC0);
  69                                 // log_word(jiffies);
  70 #endif
  71                         } else if (button_pressed[i] == 1) {
  72                                 // been already pressed
  73                                 uint16_t duration = jiffies - button_start[i];
  74                                 if (duration > 80) {
  75                                         // long button press
  76                                         button_pressed[i] = 2;
  77                                         long_press(i);
  78                                 }
  79                         }
  80                 } else { // is not pressed
  81                         if (button_pressed[i]) { // just depressed
  82                                 uint16_t duration = jiffies - button_start[i];
  83 #if 1
  84                                 log_byte(0xC1);
  85                                 log_word(duration);
  86                                 log_flush();
  87 #endif
  88                                 button_pressed[i] = 0;
  89                                 if (duration > 6 && duration < 30)
  90                                         short_press(i);
  91                                 if (sleep_after_release)
  92                                         do_sleep();
  93                         }
  94                 }
  95         }
  96 }
  97
  98 ISR(INT0_vect)
  99 {
 100         hw_setup();
 101         log_byte(0xbb);
 102         log_flush();
 103 }
 104