mirror of
https://github.com/yourtion/30dayMakeOS.git
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25 lines
536 B
C
25 lines
536 B
C
void api_end(void);
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int api_getkey(int mode);
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int api_alloctimer(void);
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void api_inittimer(int timer, int data);
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void api_settimer(int timer, int time);
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void api_beep(int tone);
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void HariMain(void)
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{
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int i, timer;
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timer = api_alloctimer();
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api_inittimer(timer, 128);
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for (i = 20000000; i >= 20000; i -= i / 100) {
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/* 20KHz～20Hz，即人类可以听到的声音范围*/
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/* i以1%的速度递减*/
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api_beep(i);
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api_settimer(timer, 1); /* 0.01秒*/
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if (api_getkey(1) != 128) {
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break;
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}
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}
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api_beep(0);
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api_end();
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}
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