diff --git a/Inc/CanSerialPortFrame.h b/Inc/CanSerialPortFrame.h
index 398ba1e..329ba94 100644
--- a/Inc/CanSerialPortFrame.h
+++ b/Inc/CanSerialPortFrame.h
@@ -75,7 +75,7 @@ typedef struct {
     osMessageQueueId_t rxDataQueue[COUNT_QUEUE];
     osMessageQueueId_t rxDataSnifferQueue[COUNT_QUEUE];
 
-    osMutexId_t access;
+    osMutexId_t access[2];
 
     DMA_InitType dmaInitCfg_RX;
     DMA_ChannelCfgType chnCfg_RX;
@@ -157,7 +157,7 @@ bool vCanSerialPortFrameMbInit(
 
 );
 
-        void CAN_RxInterrupt_CallBack_Handler(tCanSerialPortFrameFlagchip *env, uint8_t u8CanIndex, FLEXCAN_RxMsgType *pRxCfg);
+void CAN_RxInterrupt_CallBack_Handler(tCanSerialPortFrameFlagchip *env, uint8_t u8CanIndex, FLEXCAN_RxMsgType *pRxCfg);
 
 void CanSerialPortFrameIrqRxProcessing(tCanSerialPortFrameFlagchip *env, uint32_t *pBuf);
 
diff --git a/Src/CanSerialPortFrame.c b/Src/CanSerialPortFrame.c
index 3d8ee96..653e13a 100644
--- a/Src/CanSerialPortFrame.c
+++ b/Src/CanSerialPortFrame.c
@@ -267,7 +267,8 @@ bool vCanSerialPortFrameDMAInit(
             env->reInitOne = true;
 
             env->txDataQueueCan = osMessageQueueNew(1, 1, NULL);
-            env->access = osMutexNew(NULL);
+            env->access[0] = osMutexNew(NULL);
+            env->access[1] = osMutexNew(NULL);
 
             vCanSerialPortFrameInitStructure(env, 10, 0);
 
@@ -423,7 +424,8 @@ bool vCanSerialPortFrameMbInit(
         if (!env->reInitOne) {
             env->reInitOne = true;
 
-            env->access = osMutexNew(NULL);
+            env->access[0] = osMutexNew(NULL);
+            env->access[1] = osMutexNew(NULL);
             env->txDataQueueCan = osMessageQueueNew(1, 1, NULL);
 
             vCanSerialPortFrameInitStructure(env, 10, 0);
@@ -715,7 +717,7 @@ FLEXCAN_ErrorType TransmitCan(tCanSerialPortFrameFlagchip *env, FLEXCAN_TxMsgTyp
     if (tRetval != FLEXCAN_ERROR_OK) {
         FLEXCAN_TransmitAbort(env->CAN_INDEX, tTxMsg->u8TxHandler);
     } else {
-
+/*
         if (tTxMsg->bWaitTxCompleted) {
 
             uint8_t u8TxHandler;
@@ -726,7 +728,7 @@ FLEXCAN_ErrorType TransmitCan(tCanSerialPortFrameFlagchip *env, FLEXCAN_TxMsgTyp
             }
 
         }
-
+*/
         FLEXCAN_TransmitProcess(env->CAN_INDEX, tTxMsg->u8TxHandler);
     }
 
@@ -735,11 +737,11 @@ FLEXCAN_ErrorType TransmitCan(tCanSerialPortFrameFlagchip *env, FLEXCAN_TxMsgTyp
 
 
 uint16_t vCanSerialPortFrameTransmit(tCanSerialPortFrameFlagchip *env, uint8_t *data, uint16_t size, uint32_t adr,
-                                     uint8_t canType, uint32_t timeout) {
+                                     uint8_t canType, uint32_t timeout, uint8_t u8TxHandler) {
 
     uint16_t sent = 0;
 
-    if (osMutexAcquire(env->access, 1000) == osOK) {
+    if (osMutexAcquire(env->access[u8TxHandler], 1000) == osOK) {
 
         env->id = adr;
         env->canTypeFrame = canType;
@@ -751,7 +753,7 @@ uint16_t vCanSerialPortFrameTransmit(tCanSerialPortFrameFlagchip *env, uint8_t *
         FLEXCAN_ErrorType tRetval;
 
         tTxMsg.u32CanId = env->id;
-        tTxMsg.u8TxHandler = 0U;
+        tTxMsg.u8TxHandler = u8TxHandler; //0U;
 
         tTxMsg.bEnFd = FALSE;
         tTxMsg.bEnBrs = FALSE;
@@ -760,7 +762,7 @@ uint16_t vCanSerialPortFrameTransmit(tCanSerialPortFrameFlagchip *env, uint8_t *
         tTxMsg.eDataType = FLEXCAN_FRAME_DATA;
         tTxMsg.eFrameType = (FLEXCAN_IdType) env->canTypeFrame;
         tTxMsg.bWaitTxCompleted = 1U;
-        tTxMsg.u16WaitTxTimeout = 50;
+        tTxMsg.u16WaitTxTimeout = 50000;
 
 
         uint16_t len = 0;
@@ -786,7 +788,7 @@ uint16_t vCanSerialPortFrameTransmit(tCanSerialPortFrameFlagchip *env, uint8_t *
             size -= tailSize;
         }
 
-        osMutexRelease(env->access);
+        osMutexRelease(env->access[u8TxHandler]);
     }
 
     return sent;