badge/ui/event.c

   1 #include "event.h"
   2
   3 #include <core/gpio/gpio.h>
   4 #include <core/timer32/timer32.h>
   5 #include <r0ketports.h>
   6
   7 // We depend on input being popped often, so no queue.
   8 static badge_event_t volatile event_buffer;
   9 static uint8_t       volatile event_flag;
  10
  11 enum {
  12   BADGE_EVENT_FLAG_INPUT = 1,
  13   BADGE_EVENT_FLAG_TIMER = 2
  14 };
  15
  16 static uint8_t badge_input_raw(void) {
  17     uint8_t result = BTN_NONE;
  18
  19     if (gpioGetValue(RB_BTN3) == 0) { result |= BADGE_EVENT_KEY_UP    ; }
  20     if (gpioGetValue(RB_BTN2) == 0) { result |= BADGE_EVENT_KEY_DOWN  ; }
  21     if (gpioGetValue(RB_BTN4) == 0) { result |= BADGE_EVENT_KEY_CENTER; }
  22     if (gpioGetValue(RB_BTN0) == 0) { result |= BADGE_EVENT_KEY_LEFT  ; }
  23     if (gpioGetValue(RB_BTN1) == 0) { result |= BADGE_EVENT_KEY_RIGHT ; }
  24     // TODO: Knöpfe.
  25     if (gpioGetValue(RB_HB0)  == 0) { result |= BADGE_EVENT_KEY_UP    ; }
  26     if (gpioGetValue(RB_HB1)  == 0) { result |= BADGE_EVENT_KEY_UP    ; }
  27
  28     return result;
  29 }
  30
  31 uint8_t badge_event_current_input_state(void) {
  32   return badge_event_new_input_state(event_buffer);
  33 }
  34
  35 void badge_event_irq(void) {
  36   uint8_t old_state = badge_event_current_input_state();
  37   uint8_t new_state = badge_input_raw();
  38
  39   if(new_state != old_state) {
  40     event_buffer = badge_event_new(BADGE_EVENT_USER_INPUT,
  41                                    old_state,
  42                                    new_state);
  43     event_flag |= BADGE_EVENT_FLAG_INPUT;
  44   }
  45
  46   event_flag |= BADGE_EVENT_FLAG_TIMER;
  47 }
  48
  49 badge_event_t badge_event_wait(void) {
  50   while(!event_flag)
  51     ;
  52
  53   // User input takes precedence.
  54   if(event_flag & BADGE_EVENT_FLAG_INPUT) {
  55     badge_event_t event = event_buffer;
  56     event_flag &= ~BADGE_EVENT_FLAG_INPUT;
  57     return event;
  58   }
  59
  60   uint8_t state = badge_event_current_input_state();
  61   event_flag &= ~BADGE_EVENT_FLAG_TIMER;
  62   return badge_event_new(BADGE_EVENT_GAME_TICK, state, state);
  63 }
  64
  65 void badge_event_start(void) {
  66   timer32Init(0, TIMER32_CCLK_10MS * 2);
  67   timer32SetIntHandler(badge_event_irq);
  68   timer32Enable(0);
  69 }