Cortex-M3/M4 has a DWT (Data Watch and Trace Unit) which includes a clock cycle register (CYCCNT) and C-SPY implements a 64-bit cycle register accordingly, CYCLECOUNTER. This register enables accurate and extended measure execution times and combined with C-SPY macros becomes a very useful instrument in developers’ toolbox.
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://www.xiaopingtou.cn/data/attach/logo/logo.png', '推荐 styleno1 的问题《IAR Debug时可以查看函数被调用的时刻点吗？》','https://www.xiaopingtou.net/q-156509.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
精准匹配，可惜是M0的核，不支持这个功能。
一周热门 更多>