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TM4C1294中CAN通信数据字节数问题

请问TI的FAE 为什么CAN通信设置中CAN的结构参数ui32MsgLen只能设置8以内,超过的话,就无法传输,但我看CANMessageSet的源码里面,对这长度没有限制。当然可以用多次循环发送CANMessageSet的形式是可以通信的,就是ui32MsgLen的长度有什么限制?