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TMS570LC4357: CAN断开之后在重新连接会发不出数据

Part Number: TMS570LC4357


can正常通信将通信线断开,can发不出数据,再将线接上,can也发不出数据,经过debug查看,发现是TXRQx寄存器的原因

can走到这一步就直接退出了,请问我想can通信断开然后再接上,can能正常通信,应该怎么做