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LAUNCHXL-F28379D: CAN通信

Part Number: LAUNCHXL-F28379D

(小白,刚开始学)请问在进行CAN通信需要外界收发器吗?我想通过CANA的消息对象1向CANB的消息对象1发送消息测试代码是否运行成功。在这之前运行了can_ex4_simple_transmit例程,发现程序一直停留在语句while(((HWREGH(CANA_BASE + CAN_O_ES) & CAN_ES_TXOK)) !=  CAN_ES_TXOK);(没有外接收发器),请问这是什么原因造成的?