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F28069的CAN通讯问题

Other Parts Discussed in Thread: CONTROLSUITE

自己做的板子,现在用F28069调试CAN通信,应用controlsuite例程自测试功能,可以运行,收发正常,将自测试改成正常模式,就无法正常工作了,

ECanaRegs.CANTRS.bit.TRS0 = 1;                          // Set TRS for all transmit mailboxes
while(ECanaRegs.CANTA.bit.TA0 == 0){}                 // Wait for all TAn bits to be set..

一直卡在上面这,TA0一直不置位
ECanaRegs.CANTA.bit.TA0 = 1;                                // Clear all TAn

接收端用的一个CAN卡调试器,初始化程序都没有问题,请问是什么原因