修改port文件中FPU启用判断逻辑，断言钩子函数增加关调度保护，防止断言期间被调度#24
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milo-9 wants to merge 2 commits intoarmink-rtt-pkgs:masterfrom
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修改port文件中FPU启用判断逻辑，断言钩子函数增加关调度保护，防止断言期间被调度#24milo-9 wants to merge 2 commits intoarmink-rtt-pkgs:masterfrom
milo-9 wants to merge 2 commits intoarmink-rtt-pkgs:masterfrom
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目前断言钩子函数中，没有关闭调度，会导致断言过程中被高优先级任务抢占，如果该高优先级任务中使用了某些内核API， 会导致这些内核API判定目前的上下文是中断上下文，重入断言，而目前的断言是不可重入的，导致实际断言混乱，不可用。 考虑到目前实际使用中，使用flash保存日志几乎是不可行的，增加关调度逻辑应该是可行的
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