diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_IMX/spi_api.c b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_IMX/spi_api.c
old mode 100644
new mode 100755
index 0d7a7921137..69417e0b055
--- a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_IMX/spi_api.c
+++ b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_IMX/spi_api.c
@@ -123,16 +123,21 @@ int spi_master_write(spi_t *obj, int value)
 int spi_master_block_write(spi_t *obj, const char *tx_buffer, int tx_length,
                            char *rx_buffer, int rx_length, char write_fill) {
     int total = (tx_length > rx_length) ? tx_length : rx_length;
+    int ret;
 
     // Default write is done in each and every call, in future can create HAL API instead
     LPSPI_SetDummyData(spi_address[obj->instance], write_fill);
 
-    LPSPI_MasterTransferBlocking(spi_address[obj->instance], &(lpspi_transfer_t){
-          .txData = (uint8_t *)tx_buffer,
-          .rxData = (uint8_t *)rx_buffer,
-          .dataSize = total,
-          .configFlags = kLPSPI_MasterPcs0 | kLPSPI_MasterPcsContinuous | kLPSPI_SlaveByteSwap,
-    });
+    do
+    {
+        ret = LPSPI_MasterTransferBlocking(spi_address[obj->instance], &(lpspi_transfer_t){
+                .txData = (uint8_t *)tx_buffer,
+                .rxData = (uint8_t *)rx_buffer,
+                .dataSize = total,
+                .configFlags = kLPSPI_MasterPcs0 | kLPSPI_MasterPcsContinuous | kLPSPI_SlaveByteSwap,
+        });
+
+    } while((ret == kStatus_LPSPI_Busy));
 
     return total;
 }
diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/PeripheralPins.c b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/PeripheralPins.c
index c1b108c24c9..113e9b0d3cb 100644
--- a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/PeripheralPins.c
+++ b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/TARGET_EVK/PeripheralPins.c
@@ -51,11 +51,13 @@ const PinMap PinMap_I2C_SCL[] = {
 /************UART***************/
 const PinMap PinMap_UART_TX[] = {
     {GPIO_AD_B0_12, UART_1, 2},
+    {GPIO_AD_B1_06, UART_3, 2},
     {NC  ,  NC    , 0}
 };
 
 const PinMap PinMap_UART_RX[] = {
     {GPIO_AD_B0_13, UART_1, 2},
+    {GPIO_AD_B1_07, UART_3, 2},
     {NC  ,  NC    , 0}
 };
 
diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/drivers/fsl_lpspi.c b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/drivers/fsl_lpspi.c
old mode 100644
new mode 100755
index dbfbe38c980..13b902877a8
--- a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/drivers/fsl_lpspi.c
+++ b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_MIMXRT1050/drivers/fsl_lpspi.c
@@ -258,9 +258,9 @@ void LPSPI_MasterGetDefaultConfig(lpspi_master_config_t *masterConfig)
     masterConfig->cpha         = kLPSPI_ClockPhaseFirstEdge;
     masterConfig->direction    = kLPSPI_MsbFirst;
 
-    masterConfig->pcsToSckDelayInNanoSec        = 1000000000 / masterConfig->baudRate * 2;
-    masterConfig->lastSckToPcsDelayInNanoSec    = 1000000000 / masterConfig->baudRate * 2;
-    masterConfig->betweenTransferDelayInNanoSec = 1000000000 / masterConfig->baudRate * 2;
+    masterConfig->pcsToSckDelayInNanoSec        = 80;
+    masterConfig->lastSckToPcsDelayInNanoSec    = 60;
+    masterConfig->betweenTransferDelayInNanoSec = 160;
 
     masterConfig->whichPcs           = kLPSPI_Pcs0;
     masterConfig->pcsActiveHighOrLow = kLPSPI_PcsActiveLow;
@@ -871,14 +871,18 @@ status_t LPSPI_MasterTransferBlocking(LPSPI_Type *base, lpspi_transfer_t *transf
         {
         }
 
-        if (txData)
+        /* To prevent rxfifo overflow, ensure transmitting and receiving are executed in parallel */
+        if(((NULL == rxData) || (rxRemainingByteCount - txRemainingByteCount)/bytesEachRead < fifoSize))
         {
-            wordToSend = LPSPI_CombineWriteData(txData, bytesEachWrite, isByteSwap);
-            txData += bytesEachWrite;
-        }
+            if (txData)
+            {
+                wordToSend = LPSPI_CombineWriteData(txData, bytesEachWrite, isByteSwap);
+                txData += bytesEachWrite;
+            }
 
-        LPSPI_WriteData(base, wordToSend);
-        txRemainingByteCount -= bytesEachWrite;
+            LPSPI_WriteData(base, wordToSend);
+            txRemainingByteCount -= bytesEachWrite;
+        }
 
         /*Check whether there is RX data in RX FIFO . Read out the RX data so that the RX FIFO would not overrun.*/
         if (rxData)