我正在使用一个基于32位ARM Cortex-M3的ZigBee模块。但我的问题与ZigBee协议本身无关。我只能访问应用层的源代码，这对我的目的应该足够了。下层（APS）将数据传递给APSDE-data中的应用层。指示原语传递给以下应用函数：
void zbpro_dataRcvdHandler(zbpro_dataInd_t *data)
{
DEBUG_PRINT(DBG_APP,"\n[APSDE-DATA.indication]\r\n");
/* Output of raw bytes string for further investigation.
* Real length is unknown, 50 is approximation.
*/
DEBUG_PRINT(DBG_APP,"Raw data: \n");
DEBUG_PRINT(DBG_APP,"----------\n");
for (int i = 0; i < 50; i++){
DEBUG_PRINT(DBG_APP,"%02x ",*((uint8_t*)data+i));
}
DEBUG_PRINT(DBG_APP,"\n");
/* Output of APSDE-DATA.indication primitive field by field */
DEBUG_PRINT(DBG_APP,"Field by field: \n");
DEBUG_PRINT(DBG_APP,"----------------\n");
DEBUG_PRINT(DBG_APP,"Destination address: ");
for (int i = 0; i < 8; i++)
DEBUG_PRINT(DBG_APP,"%02x ",*((uint8_t*)data->dstAddress.ieeeAddr[i]));
DEBUG_PRINT(DBG_APP,"\n");
DEBUG_PRINT(DBG_APP,"Destination address mode: 0x%02x\r\n",*((uint8_t*)data->dstAddrMode));
DEBUG_PRINT(DBG_APP,"Destination endpoint: 0x%02x\r\n",*((uint8_t*)data->dstEndPoint));
DEBUG_PRINT(DBG_APP,"Source address mode: 0x%02x\r\n",*((uint8_t*)data->dstAddrMode));
DEBUG_PRINT(DBG_APP,"Source address: ");
for (int i = 0; i < 8; i++)
DEBUG_PRINT(DBG_APP,"%02x ",*((uint8_t*)data->srcAddress.ieeeAddr[i]));
DEBUG_PRINT(DBG_APP,"\n");
DEBUG_PRINT(DBG_APP,"Source endpoint: 0x%02x\r\n",*((uint8_t*)data->srcEndPoint));
DEBUG_PRINT(DBG_APP,"Profile Id: 0x%04x\r\n",*((uint16_t*)data->profileId));
DEBUG_PRINT(DBG_APP,"Cluster Id: 0x%04x\r\n",*((uint16_t*)data->clusterId));
DEBUG_PRINT(DBG_APP,"Message length: 0x%02x\r\n",*((uint8_t*)data->messageLength));
DEBUG_PRINT(DBG_APP,"Flags: 0x%02x\r\n",*((uint8_t*)data->flags));
DEBUG_PRINT(DBG_APP,"Security status: 0x%02x\r\n",*((uint8_t*)data->securityStatus));
DEBUG_PRINT(DBG_APP,"Link quality: 0x%02x\r\n",*((uint8_t*)data->linkQuality));
DEBUG_PRINT(DBG_APP,"Source MAC Address: 0x%04x\r\n",*((uint16_t*)data->messageLength));
DEBUG_PRINT(DBG_APP,"Message: ");
for (int i = 0; i < 13; i++){
DEBUG_PRINT(DBG_APP,"%02x ",*((uint8_t*)data->messageContents+i));
}
DEBUG_PRINT(DBG_APP,"\n");
bufm_deallocateBuffer((uint8_t *)data, CORE_MEM);
}
APSDE-DATA.indication原语由以下结构实现：
/**
* @brief type definition for address (union of short address and extended address)
*/
typedef union zbpro_address_tag {
uint16_t shortAddr;
uint8_t ieeeAddr[8];
} zbpro_address_t;
/**
* @brief apsde data indication structure
*/
PACKED struct zbpro_dataInd_tag {
zbpro_address_t dstAddress;
uint8_t dstAddrMode;
uint8_t dstEndPoint;
uint8_t srcAddrMode;
zbpro_address_t srcAddress;
uint8_t srcEndPoint;
uint16_t profileId;
uint16_t clusterId;
uint8_t messageLength;
uint8_t flags; /* bit0: broadcast or not; bit1: need aps ack or not; bit2: nwk key used; bit3: aps link key used */
uint8_t securityStatus; /* not-used, reserved for future */
uint8_t linkQuality;
uint16_t src_mac_addr;
uint8_t messageContents[1];
};
typedef PACKED struct zbpro_dataInd_tag zbpro_dataInd_t;
因此，我收到下一个：
[APSDE-DATA.indication]
Raw data:
---------
00 00 00 72 4c 19 40 00 02 e8 03 c2 30 02 fe ff 83 0a 00 e8 05 c1 11 00 11 08 58 40 72 4c ae 53 4d 3f 63 9f d8 51 da ca 87 a9 0b b3 7b 04 68 ca 87 a9
Field by field:
---------------
Destination address: 00 00 00 28 fa 44 34 00
Destination address mode: 0x12
Destination endpoint: 0xc2
Source address mode: 0x12
Source address: 13 01 12 07 02 bd 02 00
Source endpoint: 0xc2
Profile Id: 0xc940
Cluster Id: 0x90a0
Message length: 0x00
Flags: 0x00
Security status: 0x04
Link quality: 0x34
Source MAC Address: 0x90a0
Message: ae 53 4d 3f 63 9f d8 51 da ca 87 a9 0b
从这个输出中我可以看到，虽然原始字符串有一些期望值，但是调度字段是完全不同的。这种行为的原因是什么？如何解决？它是否与ARM架构或错误的类型转换有关？
我没有访问调试打印的实现的权限，但我们可以假设它工作正常。
最佳答案
例如，不需要在调试打印语句中取消引用
DEBUG_PRINT(DBG_APP,"%02x ",*((uint8_t*)data->dstAddress.ieeeAddr[i]));
应该很简单
DEBUG_PRINT(DBG_APP,"%02x ", data->dstAddress.ieeeAddr[i]);
等等等等。。。
关于c - 分解具有特定结构的原始字节字符串会产生错误的数据，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/34682854/