1 #include "gbasys.h"

2 #include "logger.h"

3

4 static void draw(void);

5 static void keyb(int key, int pressed);

6 static void keyb_intr(void);

7

8 static unsigned short keystate;

9

10 #define EVQ_SIZE 8

11 volatile static unsigned short evhead, evtail;

12 static unsigned short events[EVQ_SIZE];

13

14 int main(void)

15 {

16 gba_init();

17 interrupt(INTR_KEY, keyb_intr);

18

19 set_video_mode(VMODE_LFB_160x128_16, 1);

20

21 clear_buffer(front_buffer, 0);

22 set_text_writebg(1);

23 logmsg(LOG_ALL, "please wait...\n");

24

25 for(;;) {

26 /* process events */

27 while(evhead != evtail) {

28 unsigned short ev = events[evhead];

29 evhead = (evhead + 1) % EVQ_SIZE;

30 keyb(ev, 1);

31 }

32 draw();

33 }

34 return 0;

35 }

36

37 static void draw(void)

38 {

39 }

40

41 static void keyb(int key, int pressed)

42 {

43 static const char *keyname[] = {

44 "A", "B", "select", "start", "right", "left", "up", "down", "RT", "LT"

45 };

46 int i;

47 for(i=0; i<32; i++) {

48 if(key & 1) {

49 break;

50 }

51 key >>= 1;

52 }

53 if(i < sizeof keyname / sizeof *keyname) {

54 logmsg(LOG_ALL, "key %s %s\n", keyname[i], pressed ? "pressed" : "released");

55 }

56 }

57

58 static void keyb_intr(void)

59 {

60 int i;

61 unsigned short prev_keystate = keystate;

62 unsigned short diff;

63 keystate = get_key_state(KEY_ALL);

64 diff = keystate ^ prev_keystate;

65

66 for(i=0; i<32; i++) {

67 int key = 1 << i;

68

69 if(diff & key) {

70 events[evtail] = key;

71 evtail = (evtail + 1) % EVQ_SIZE;

72 }

73 }

74 }