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关于Emulation Performance Counter

Other Parts Discussed in Thread: SYSBIOS

问题1

我的OMAPL138上的C6748设置为456MHz主频

根据手册,Emulation Performance Counter应该是主频/4的频率计数

也就是456MHz / 4 = 114MHz = 114 000 KHz = 114 000 000 Hz

我的Timer 1ms 中断一次,读取EMUCNT0,然后减去旧的值

456MHz / 4 = 114MHz = 114 000 KHz = 114 000 000 Hz
Timer = 1 KHz = 1000 Hz

根据上面换算,我减去旧的值,得到的值,是不是应该是114 000,为什么相差比较远

问题2

EMUCNT1的作用是什么

问题3

在sysbios环境中,并没有对EMUCNT0进行任何写入操作,这个寄存器计数了,是不是sysbios内部已经启动了