forked from backup/30dayMakeOS
20 lines
378 B
C
20 lines
378 B
C
#include "apilib.h"
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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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