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GPIO4引脚触发EDMA传输问题

请教一下GPIO4引脚触发emda传输,传输完成中断触发后程序就无法进行了,只能完成一次EDMA传输,是什么原因?单独GPIO4和EDMA传输完成中断都可以不断触发,但两个中断嵌套后只能触发一次,代码是用GPIO和EDMA的csl库例子组合起来的。EDMA传输时间比中断间隔时间小得多,能否不采用EDMA传输完成中断?