buttons.c

   1 #include <avr/io.h>
   2 #include <avr/interrupt.h>
   3
   4 #include "lights.h"
   5
   6 static uint16_t button_start[N_BUTTONS];
   7 static unsigned char button_pressed[N_BUTTONS];
   8
   9 void init_buttons()
  10 {
  11         // MCUCR |= _BV(ISC00); // any edge generates IRQ
  12         // GIMSK |= _BV(INT0); // enable INT0
  13         DDRB &= ~(_BV(PB6) | _BV(PB0));
  14         PORTB |= _BV(PB6) | _BV(PB0);
  15
  16         // log_byte(PORTB);
  17 }
  18
  19 extern unsigned char led1_counter;
  20
  21 static void inline long_press(unsigned char n)
  22 {
  23         led_set_status(2);
  24 }
  25
  26 static void inline short_press(unsigned char n)
  27 {
  28         led_set_status(1);
  29 }
  30
  31 void timer_check_buttons()
  32 {
  33         unsigned char pinb = PINB;
  34         unsigned char i;
  35         unsigned char port_states[N_BUTTONS] = {
  36                 pinb & _BV(PB6),
  37                 pinb & _BV(PB0),
  38         };
  39         for (i = 0; i < N_BUTTONS; i++) {
  40                 if (!port_states[i]) { // is pressed
  41                         if (button_pressed[i] == 0) {
  42                                 // begin of button press
  43                                 button_pressed[i] = 1;
  44                                 button_start[i] = jiffies;
  45 #if 0
  46                                 // log_byte(0xC0);
  47                                 // log_word(jiffies);
  48 #endif
  49                         } else if (button_pressed[i] == 1) {
  50                                 // been already pressed
  51                                 uint16_t duration = jiffies - button_start[i];
  52                                 if (duration > 80) {
  53                                         // long button press
  54                                         button_pressed[i] = 2;
  55                                         long_press(i);
  56                                 }
  57                         }
  58                 } else { // is not pressed
  59                         if (button_pressed[i]) { // just depressed
  60                                 uint16_t duration = jiffies - button_start[i];
  61 #if 1
  62                                 log_byte(0xC1);
  63                                 log_word(duration);
  64                                 log_flush();
  65 #endif
  66                                 button_pressed[i] = 0;
  67                                 if (duration > 6 && duration < 30)
  68                                         short_press(i);
  69                         }
  70                 }
  71         }
  72 }
  73
  74 #if 0
  75 ISR(INT0_vect)
  76 {
  77         unsigned char tmpval = PINB & _BV(PB6);
  78
  79         gpio_set(GPIO_LED2, tmpval);
  80         log_byte(0xbb);
  81         log_flush();
  82 }
  83 #endif
  84