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28 lines
632 B
C
28 lines
632 B
C
#include "glib.h"
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#include "string.h"
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/**
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* @brief 这个函数让蜂鸣器发声，目前仅用于真机调试。未来将移除，请勿依赖此函数。
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*
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* @param times 发声循环多少遍
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*/
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void __experimental_beep(uint64_t times)
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{
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io_out8(0x43, 182&0xff);
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io_out8(0x42, 2280&0xff);
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io_out8(0x42, (2280>>8)&0xff);
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uint32_t x = io_in8(0x61)&0xff;
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x |= 3;
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io_out8(0x61, x&0xff);
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times *= 10000;
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for(uint64_t i=0;i<times;++i)
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pause();
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x = io_in8(0x61);
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x &= 0xfc;
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io_out8(0x61, x&0xff);
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// 延迟一段时间
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for(uint64_t i=0;i<times;++i)
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pause();
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} |