diff --git a/Inc/SerialPortFlagchip.h b/Inc/SerialPortFlagchip.h
index 02b3a6f..4c4dd97 100644
--- a/Inc/SerialPortFlagchip.h
+++ b/Inc/SerialPortFlagchip.h
@@ -36,7 +36,8 @@ typedef struct {
     DMA_ChannelCfgType chnCfg;
     DMA_InterruptCfgType interruptCfg;
 
-    uint8_t dataBufTransmit[512];
+    uint8_t *dataBufTransmit;
+    uint32_t dataBufTransmitLen;
 
     osMessageQueueId_t txAccessQueue;
     osMessageQueueId_t rxDataQueue;
@@ -55,6 +56,9 @@ void vSerialPortInitDMA(
         IRQn_Type IRQ_UART, // FCUART0_IRQn ... FCUART7_IRQn
         uint8 UART_PRIORITY,
 
+        uint8_t *dataBufTransmit,
+        uint32_t dataBufTransmitLen,
+
         DMA_ChannelType RX_DMA_CHANNEL,
         DMA_RequestSourceType RX_DMA_CHANNEL_REQ,
 
diff --git a/Src/SerialPortFlagchip.c b/Src/SerialPortFlagchip.c
index c7f8172..a07d58d 100644
--- a/Src/SerialPortFlagchip.c
+++ b/Src/SerialPortFlagchip.c
@@ -28,6 +28,9 @@ void vSerialPortInitDMA(
         IRQn_Type IRQ_UART, // FCUART0_IRQn ... FCUART7_IRQn
         uint8 UART_PRIORITY,
 
+        uint8_t *dataBufTransmit,
+        uint32_t dataBufTransmitLen,
+
         DMA_ChannelType RX_DMA_CHANNEL,
         DMA_RequestSourceType RX_DMA_CHANNEL_REQ,
 
@@ -59,6 +62,9 @@ void vSerialPortInitDMA(
 
     env->UART_DMA_RECEIVED_LEN_BUF = 0;
 
+    env->dataBufTransmit = dataBufTransmit;
+    env->dataBufTransmitLen = dataBufTransmitLen;
+
     env->txAccessQueue = osMessageQueueNew(1, 1, NULL);
     env->rxDataQueue = osMessageQueueNew(rxBufferLength, 1, NULL);
 
@@ -69,7 +75,6 @@ void vSerialPortInitDMA(
     }
 
 
-
     FCUART_InitMemory(UART_INDEX);
 
     env->dmaInitCfg.eArbitrationAlgorithm = DMA_ARBITRATION_ALGORITHM_FIXED_PRIORITY;
@@ -231,7 +236,7 @@ vSerialPortTransmitOverCore(tSerialPortFlagchip *env, uint8_t *data, uint16_t si
 
     FCUART_ErrorType tRetVal;
 
-    memcpy(env->dataBufTransmit, data, size);
+//    memcpy(env->dataBufTransmit, data, size);
     tRetVal = FCUART_AssignTxInterruptData(env->UART_INDEX, env->dataBufTransmit, size);
 
     tRetVal = FCUART_StartTransmit(env->UART_INDEX);
@@ -252,9 +257,9 @@ void SerialPort_TxEndTransmitted(tSerialPortFlagchip *env, uint8_t data) {
 void SerialPort_RxDmaBufToQueue(tSerialPortFlagchip *env, const void *pSrcBuffer) {
 
     for (uint32_t i = 0; i < env->UART_DMA_RECEIVED_LEN_BUF; ++i) {
-        osMessageQueuePut(env->rxDataQueue, &((uint8 *)pSrcBuffer)[i], 0x0, 0U);
+        osMessageQueuePut(env->rxDataQueue, &((uint8 *) pSrcBuffer)[i], 0x0, 0U);
         if (env->rxDataSnifferQueue) {
-            osMessageQueuePut(env->rxDataSnifferQueue, &((uint8 *)pSrcBuffer)[i], 0x0, 0U);
+            osMessageQueuePut(env->rxDataSnifferQueue, &((uint8 *) pSrcBuffer)[i], 0x0, 0U);
         }
     }