在DragonOS中,使蜂鸣器发声
发声 蜂鸣器 DragonOS
2023-06-13 09:14:17 时间
很简单,代码如下:
void beep(uint64_t times)
{
io_out8(0x43, 182&0xff);
io_out8(0x42, 2280&0xff);
io_out8(0x42, (2280>>8)&0xff);
uint32_t x = io_in8(0x61)&0xff;
x |= 3;
io_out8(0x61, x&0xff);
times *= 10000;
for(uint64_t i=0;i<times;++i)
pause();
x = io_in8(0x61);
x &= 0xfc;
io_out8(0x61, x&0xff);
}
转载请注明来源:https://longjin666.cn/?p=1537