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TMS320F280049C: can_ex5_transmit_receive例程在LAUNCHXL-F280049C无法发送

Part Number: TMS320F280049C

编译选择CPU1_LAUNCHXL_FLASH,配置为发送,使用在线仿真一直停在txMsgSuccessful的判断处,CAN盒连接CAN_H和CAN_L也没有看到有报文,开发板是还需要外接别的器件吗?还是程序哪里配置的不对?