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TMS320F2800157: 关于CAN发送邮箱空的判断

Part Number: TMS320F2800157

您好,我需要在每次发送前查找空邮箱来发送,请问该用哪个标志位来判断邮箱是否为空呢?应用场景是同一时间有多个ID的报文需要发送,要求轮询空邮箱,查到哪个邮箱为空就用哪个邮箱发