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宏定义为0x01是什么意思?

例如:

#define AF_INCOMING_MSG_CMD 0x1A          // Incoming MSG type message

这里的AF_INCOMING_MSG_CMD在哪里注册过?

怎么就冷不丁地有一个:

case AF_INCOMING_MSG_CMD:
            GenericApp_MessageMSGCB( MSGpkt );
break;

再如:

#define HAL_UART_RX_FULL 0x01

这里的HAL_UART_RX_FULL 又是在哪里注册过呢?

求教!