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
  26     return result;
  27 }
  28
  29 uint8_t badge_event_current_input_state(void) {
  30   return badge_event_new_input_state(event_buffer);
  31 }
  32
  33 void badge_event_irq(void) {
  34   uint8_t old_state = badge_event_current_input_state();
  35   uint8_t new_state = badge_input_raw();
  36
  37   if(new_state != old_state) {
  38     event_buffer = badge_event_new(BADGE_EVENT_USER_INPUT,
  39                                    old_state,
  40                                    new_state);
  41     event_flag |= BADGE_EVENT_FLAG_INPUT;
  42   }
  43
  44   event_flag |= BADGE_EVENT_FLAG_TIMER;
  45 }
  46
  47 badge_event_t badge_event_wait(void) {
  48   while(!event_flag)
  49     ;
  50
  51   // User input takes precedence.
  52   if(event_flag & BADGE_EVENT_FLAG_INPUT) {
  53     badge_event_t event = event_buffer;
  54     event_flag &= ~BADGE_EVENT_FLAG_INPUT;
  55     return event;
  56   }
  57
  58   uint8_t state = badge_event_current_input_state();
  59   event_flag &= ~BADGE_EVENT_FLAG_TIMER;
  60   return badge_event_new(BADGE_EVENT_GAME_TICK, state, state);
  61 }
  62
  63 void badge_event_start(void) {
  64   timer32Init(0, TIMER32_CCLK_10MS);
  65   timer32SetIntHandler(badge_event_irq);
  66   timer32Enable(0);
  67 }