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nuclear@0
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1 #include "gbasys.h"
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2 #include "logger.h"
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3
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4 static void draw(void);
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5 static void keyb(int key, int pressed);
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6 static void keyb_intr(void);
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7
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8 static unsigned short keystate;
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9
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10 #define EVQ_SIZE 8
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11 volatile static unsigned short evhead, evtail;
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12 static unsigned short events[EVQ_SIZE];
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13
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14 int main(void)
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15 {
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16 gba_init();
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17 interrupt(INTR_KEY, keyb_intr);
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18
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19 set_video_mode(VMODE_LFB_160x128_16, 1);
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20
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21 clear_buffer(front_buffer, 0);
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22 set_text_writebg(1);
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23 logmsg(LOG_ALL, "please wait...\n");
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24
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25 for(;;) {
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26 /* process events */
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27 while(evhead != evtail) {
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28 unsigned short ev = events[evhead];
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29 evhead = (evhead + 1) % EVQ_SIZE;
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30 keyb(ev, 1);
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31 }
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32 draw();
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33 }
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34 return 0;
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35 }
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36
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37 static void draw(void)
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38 {
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39 }
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40
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41 static void keyb(int key, int pressed)
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42 {
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43 static const char *keyname[] = {
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44 "A", "B", "select", "start", "right", "left", "up", "down", "RT", "LT"
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45 };
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46 int i;
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47 for(i=0; i<32; i++) {
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48 if(key & 1) {
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49 break;
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50 }
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51 key >>= 1;
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52 }
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53 if(i < sizeof keyname / sizeof *keyname) {
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54 logmsg(LOG_ALL, "key %s %s\n", keyname[i], pressed ? "pressed" : "released");
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55 }
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56 }
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57
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58 static void keyb_intr(void)
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59 {
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60 int i;
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61 unsigned short prev_keystate = keystate;
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62 unsigned short diff;
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63 keystate = get_key_state(KEY_ALL);
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64 diff = keystate ^ prev_keystate;
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65
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66 for(i=0; i<32; i++) {
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67 int key = 1 << i;
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68
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69 if(diff & key) {
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70 events[evtail] = key;
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71 evtail = (evtail + 1) % EVQ_SIZE;
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72 }
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73 }
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74 }
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