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This example sets up the CAN controller in External Loopback test mode. //! Data transmitted is visible on the CANTXA pin and is received internally //! back to the CAN Core. Please refer to details of the External Loopback //! Test Mode in the CAN Chapter in the Technical Reference Manual. //! //! \b External \b Connections \n //! - None.
使用CAN卡以及测试CANTX，CANRX均未获得CAN信号，求解释，谢谢。
