diff --git a/peripheral/com.c b/peripheral/com.c
index e9ed1ad..aa6c5e6 100644
--- a/peripheral/com.c
+++ b/peripheral/com.c
@@ -72,7 +72,8 @@ TComCtrl *rd_ComCreate(cbk_ComCheck _pfCheck, cbk_ComDecode _pfDecode, cbk_ComSe
     if (NULL == ptComCtrl) return NULL;
     ptComCtrl->m_iBufferSize = _iSize;
     ptComCtrl->m_pUserData = _pUserData;
-    //Rd_SemInit(&ptComCtrl->m_stComBuf.m_sem_Recv, 0, 0);
+    ptComCtrl->m_pSendTempBuffer = RD_CALLOC(1, _iSize);
+    Rd_SemInit(&ptComCtrl->m_stComBuf.m_sem_Recv, 0, 0);
     Rd_SemInit(&ptComCtrl->m_stComBuf.m_sem_Send, 0, 0);
     ptComCtrl->m_stComBuf.m_ptRecv = rd_RingbufferCreate(_iSize);
     rd_RingbufferReset(ptComCtrl->m_stComBuf.m_ptRecv);
@@ -117,7 +118,8 @@ int rd_ComDelete(TComCtrl *_ptComCtrl)
         utarray_free(_ptComCtrl->m_pMutiDevArray);
     }
     
-    //Rd_SemDestroy(&_ptComCtrl->m_stComBuf.m_sem_Recv);
+    RD_FREE(_ptComCtrl->m_pSendTempBuffer);
+    Rd_SemDestroy(&_ptComCtrl->m_stComBuf.m_sem_Recv);
     Rd_SemDestroy(&_ptComCtrl->m_stComBuf.m_sem_Send);
     rd_RingbufferDestroy(_ptComCtrl->m_stComBuf.m_ptRecv);
     rd_RingbufferDestroy(_ptComCtrl->m_stComBuf.m_ptSend);
@@ -167,16 +169,14 @@ int rd_ComSend(TComCtrl *_ptComCtrl, char *_pBuffer, uint32_t _iSize)
 void rd_ComSendProc(TComCtrl *_ptComCtrl)
 {
     if (NULL == _ptComCtrl) return;
-    char *pcBuffer = RD_CALLOC(1, _ptComCtrl->m_iBufferSize);;
     int iRet = 0;
 
     Rd_SemWait(&_ptComCtrl->m_stComBuf.m_sem_Send, __func__, NULL);
-    iRet = rd_RingbufferGet(_ptComCtrl->m_stComBuf.m_ptSend, pcBuffer, _ptComCtrl->m_iBufferSize);
+    iRet = rd_RingbufferGet(_ptComCtrl->m_stComBuf.m_ptSend, _ptComCtrl->m_pSendTempBuffer, _ptComCtrl->m_iBufferSize);
     if (iRet > 0)
     {
-        rd_ComSend(_ptComCtrl, pcBuffer, iRet);
+        rd_ComSend(_ptComCtrl, _ptComCtrl->m_pSendTempBuffer, iRet);
     }
-    RD_FREE(pcBuffer);
 }
 
 void rd_ComRecvProc(TComCtrl *_ptComCtrl, const char *_pBuffer, uint32_t _iSize)
@@ -200,25 +200,6 @@ int rd_ComWrite(TComCtrl *_ptComCtrl, char *_pBuffer, uint32_t _iSize)
     return iRet;
 }
 
-//static int rd_MutiDevIsconflict(TComCtrl *_ptComCtrl, char *_pBuffer, uint32_t _iSize, int _MyIdx)
-//{
-//    int iArrlen = utarray_len(_ptComCtrl->m_pMutiDevArray);
-//    for(int i = 0; i < iArrlen; i++)
-//    {
-//        TMutiDev **ppMutiDev = (TMutiDev**)utarray_eltptr(_ptComCtrl->m_pMutiDevArray, i);
-//        TMutiDev *ptMutiDev = *ppMutiDev;
-//        if (i == _MyIdx) continue;
-//
-//        int result = ptMutiDev->m_pfCheck(_pBuffer, _iSize);
-//        if (result > 0)
-//        {
-//            return i;
-//        }
-//    }
-//    return RD_NULL;
-//}
-
-
 /*****************************************************************************
  函 数 名  : rd_ComRead
  功能描述  : 读取一包数据，这里的入参用于存放校验通过的数据，如果buffer实际大小
@@ -279,7 +260,7 @@ int rd_ComRead(TComCtrl *_ptComCtrl, char *_pBuffer, uint32_t _iSize)
                 iPackLen = ptMutiDev->m_pfCheck(pPeakData, iPeakLen);
             }
 
-            if (iPackLen > 0 && iPackLen <= iPeakLen)
+            if (iPackLen > 0)
             {
                 _ptComCtrl->m_iDevIndex = i;
                 bFound = 1;
@@ -344,19 +325,29 @@ int rd_ComRead(TComCtrl *_ptComCtrl, char *_pBuffer, uint32_t _iSize)
         {
              iPackLen = ptMutiDev->m_pfCheck(pPeakData, iPeakLen);
         }
-
-//        if (rd_MutiDevIsconflict(_ptComCtrl, pPeakData, iPeakLen, _ptComCtrl->m_iDevIndex) >= 0)
-//        {
-//            _ptComCtrl->m_iDevIndex = -1;
-//            char temp[1];
-//            rd_RingbufferGet(_ptComCtrl->m_stComBuf.m_ptRecv, temp, 1);
-//            return RD_FAILURE;
-//        }
         
         if (iPackLen > 0 && iPackLen <= iPeakLen)
         {
-            int iLen = (_iSize > iPackLen) ? iPackLen : _iSize;
-            int iRet = rd_RingbufferGet(_ptComCtrl->m_stComBuf.m_ptRecv, _pBuffer, iLen);
+            if (_iSize < iPackLen)
+            {
+                // 用户 buffer 太小，直接丢弃完整包，避免污染后续解析
+                char *dropBuf = RD_CALLOC(1, iPackLen);
+                if (dropBuf != NULL)
+                {
+                    rd_RingbufferGet(_ptComCtrl->m_stComBuf.m_ptRecv, dropBuf, iPackLen);
+                    RD_FREE(dropBuf);
+                }
+                else
+                {
+                    char temp[1];
+                    rd_RingbufferGet(_ptComCtrl->m_stComBuf.m_ptRecv, temp, 1);
+                }
+
+                _ptComCtrl->m_iDevIndex = -1;
+                ptMutiDev->m_uiLastRecvTime = 0;
+                return RD_INVALUE;
+            }
+            int iRet = rd_RingbufferGet(_ptComCtrl->m_stComBuf.m_ptRecv, _pBuffer, iPackLen);
             
             if (iRet > 0)
             {
@@ -364,7 +355,7 @@ int rd_ComRead(TComCtrl *_ptComCtrl, char *_pBuffer, uint32_t _iSize)
                 if(NULL != ptMutiDev->m_pfDecode) 
                 {
                     ptMutiDev->m_uiLastRecvTime = 0;
-                    ptMutiDev->m_pfDecode(_pBuffer, iLen);                    
+                    ptMutiDev->m_pfDecode(_pBuffer, iRet);                    
                 }
                 return iRet;
             }
@@ -374,11 +365,30 @@ int rd_ComRead(TComCtrl *_ptComCtrl, char *_pBuffer, uint32_t _iSize)
                 return RD_FAILURE;
             }
         }
+        else if (iPackLen == 0 || iPackLen > iPeakLen)
+        {
+            if (ptMutiDev->m_uiLastRecvTime == 0)
+            {
+                ptMutiDev->m_uiLastRecvTime = u32CurrentTime;
+            }
+
+            if ((u32CurrentTime - ptMutiDev->m_uiLastRecvTime) > RECV_TIMEOUT)
+            {
+                char temp[1];
+                rd_RingbufferGet(_ptComCtrl->m_stComBuf.m_ptRecv, temp, 1);
+                ptMutiDev->m_uiLastRecvTime = 0;
+                _ptComCtrl->m_iDevIndex = -1;
+                return RD_FAILURE;
+            }
+
+            return 0;
+        }
         else 
         {
             // 长度错误或异常
             char temp[1];
             rd_RingbufferGet(_ptComCtrl->m_stComBuf.m_ptRecv, temp, 1);
+            ptMutiDev->m_uiLastRecvTime = 0;
             _ptComCtrl->m_iDevIndex = -1;
             return RD_FAILURE; 
         }
diff --git a/peripheral/include/com.h b/peripheral/include/com.h
index bd1b230..a28064d 100644
--- a/peripheral/include/com.h
+++ b/peripheral/include/com.h
@@ -95,6 +95,7 @@ typedef struct
 typedef struct
 {
     TComBuffer m_stComBuf;
+    char *m_pSendTempBuffer;
     int m_iBufferSize;
     int m_iDevIndex; // 表示当前正在接收的设备索引,-1表示当前无设备在处理
     UT_array *m_pMutiDevArray;