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协调器 莫名卡死在macMcuRfIsr中

问题是这样的,协调器运行一段时间以后,就会莫名的卡在macMcuRfIsr函数的

/* process RFIRQF0 next */
if ((RFIRQF0 & IRQ_FIFOP) & rfim)
{
/* continue to execute interrup t handler as long as FIFOP is active */
do
{
macRxThresholdIsr();
RFIRQF0 = ~IRQ_FIFOP;
} while (FSMSTAT1 & FIFOP);
},不知道该怎么解决。