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F28M35x如何计算LD2的闪烁周期

烧写blinky_c28程序后,示波器测得LD2的闪烁周期为372ms;而程序中延迟程序为for(delay = 0; delay < 2000000; delay++);根据C28核的主频为150MHz,我想知道如何计算出LD2的闪烁周期啊???麻烦朋友们给指导一下,谢谢了!!!