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TMS320F280039C: MCAN发送打断点后,无法发送can信号

Part Number: TMS320F280039C

在官方例子mcan_ex7_classic_transmit中,正常情况下能发送CAN信号,但打了断点后,can信号不能发送,看程序是一直在“while(MCAN_getTxBufReqPend(MCANA_DRIVER_BASE)){ }”这个循环中。请问这是什么问题?应该怎么解决?