diff --git a/platform/mcu/MK22FN512xxx12/drivers/usb/usb_osa_bm.c b/platform/mcu/MK22FN512xxx12/drivers/usb/usb_osa_bm.c
index 4033089b..a1b7fa32 100644
--- a/platform/mcu/MK22FN512xxx12/drivers/usb/usb_osa_bm.c
+++ b/platform/mcu/MK22FN512xxx12/drivers/usb/usb_osa_bm.c
@@ -92,448 +92,14 @@ USB_GLOBAL static usb_osa_msgq_struct_t s_UsbBmMsgqStruct[USB_OSA_BM_MSGQ_COUNT]
  * Code
  ******************************************************************************/
 
-void *USB_OsaMemoryAllocate(uint32_t length)
-{
-    void *p = (void *)malloc(length);
-    uint8_t *temp = (uint8_t *)p;
-    if (p)
-    {
-        for (uint32_t count = 0U; count < length; count++)
-        {
-            temp[count] = 0U;
-        }
-    }
-    return p;
-}
-
-void USB_OsaMemoryFree(void *p)
-{
-    free(p);
-}
-
 void USB_OsaEnterCritical(uint32_t *sr)
 {
-    *sr = DisableGlobalIRQ();
+    *sr = __get_PRIMASK();
+    __disable_irq();
     __ASM("CPSID I");
 }
 
 void USB_OsaExitCritical(uint32_t sr)
 {
-    EnableGlobalIRQ(sr);
-}
-
-usb_osa_status_t USB_OsaEventCreate(usb_osa_event_handle *handle, uint32_t flag)
-{
-    usb_osa_event_struct_t *event = NULL;
-    USB_OSA_SR_ALLOC();
-
-    if (!handle)
-    {
-        return kStatus_USB_OSA_Error;
-    }
-
-    USB_OSA_ENTER_CRITICAL();
-    for (uint32_t i = 0; i < USB_OSA_BM_EVENT_COUNT; i++)
-    {
-        if (0 == s_UsbBmEventStruct[i].isUsed)
-        {
-            event = &s_UsbBmEventStruct[i];
-            break;
-        }
-    }
-
-    if (NULL == event)
-    {
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_Error;
-    }
-
-    event->value = 0U;
-    event->flag = flag;
-    event->isUsed = 1;
-    *handle = event;
-    USB_OSA_EXIT_CRITICAL();
-    return kStatus_USB_OSA_Success;
-}
-
-usb_osa_status_t USB_OsaEventDestroy(usb_osa_event_handle handle)
-{
-    usb_osa_event_struct_t *event = (usb_osa_event_struct_t *)handle;
-    USB_OSA_SR_ALLOC();
-
-    if (handle)
-    {
-        USB_OSA_ENTER_CRITICAL();
-        event->isUsed = 0;
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_Success;
-    }
-    return kStatus_USB_OSA_Error;
-}
-
-usb_osa_status_t USB_OsaEventSet(usb_osa_event_handle handle, uint32_t bitMask)
-{
-    usb_osa_event_struct_t *event = (usb_osa_event_struct_t *)handle;
-    USB_OSA_SR_ALLOC();
-
-    if (handle)
-    {
-        USB_OSA_ENTER_CRITICAL();
-        event->value |= bitMask;
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_Success;
-    }
-    return kStatus_USB_OSA_Error;
-}
-
-usb_osa_status_t USB_OsaEventWait(
-    usb_osa_event_handle handle, uint32_t bitMask, uint32_t flag, uint32_t timeout, uint32_t *bitSet)
-{
-    usb_osa_event_struct_t *event = (usb_osa_event_struct_t *)handle;
-    uint32_t bits;
-    USB_OSA_SR_ALLOC();
-
-    if (handle)
-    {
-        USB_OSA_ENTER_CRITICAL();
-        bits = event->value & bitMask;
-        if (flag)
-        {
-            if (bits != bitMask)
-            {
-                USB_OSA_EXIT_CRITICAL();
-                return kStatus_USB_OSA_TimeOut;
-            }
-        }
-        else
-        {
-            if (!bits)
-            {
-                USB_OSA_EXIT_CRITICAL();
-                return kStatus_USB_OSA_TimeOut;
-            }
-        }
-        if (bitSet)
-        {
-            *bitSet = bits;
-        }
-        if (event->flag)
-        {
-            event->value &= ~bits;
-        }
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_Success;
-    }
-    return kStatus_USB_OSA_Error;
-}
-
-usb_osa_status_t USB_OsaEventCheck(usb_osa_event_handle handle, uint32_t bitMask, uint32_t *bitSet)
-{
-    usb_osa_event_struct_t *event = (usb_osa_event_struct_t *)handle;
-    uint32_t bits;
-    USB_OSA_SR_ALLOC();
-
-    if (handle)
-    {
-        USB_OSA_ENTER_CRITICAL();
-        bits = event->value & bitMask;
-
-        if (!bits)
-        {
-            USB_OSA_EXIT_CRITICAL();
-            return kStatus_USB_OSA_Error;
-        }
-
-        if (bitSet)
-        {
-            *bitSet = bits;
-        }
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_Success;
-    }
-    return kStatus_USB_OSA_Error;
-}
-
-usb_osa_status_t USB_OsaEventClear(usb_osa_event_handle handle, uint32_t bitMask)
-{
-    usb_osa_event_struct_t *event = (usb_osa_event_struct_t *)handle;
-    uint32_t bits;
-    USB_OSA_SR_ALLOC();
-
-    if (handle)
-    {
-        USB_OSA_ENTER_CRITICAL();
-        bits = event->value & bitMask;
-        event->value &= ~bits;
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_Success;
-    }
-    return kStatus_USB_OSA_Error;
-}
-
-usb_osa_status_t USB_OsaSemCreate(usb_osa_sem_handle *handle, uint32_t count)
-{
-    usb_osa_sem_struct_t *sem = NULL;
-    USB_OSA_SR_ALLOC();
-
-    if (!handle)
-    {
-        return kStatus_USB_OSA_Error;
-    }
-
-    USB_OSA_ENTER_CRITICAL();
-    for (uint32_t i = 0; i < USB_OSA_BM_SEM_COUNT; i++)
-    {
-        if (0 == s_UsbBmSemStruct[i].isUsed)
-        {
-            sem = &s_UsbBmSemStruct[i];
-            break;
-        }
-    }
-    if (NULL == sem)
-    {
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_Error;
-    }
-
-    sem->value = count;
-    sem->isUsed = 1;
-    *handle = sem;
-    USB_OSA_EXIT_CRITICAL();
-    return kStatus_USB_OSA_Success;
-}
-
-usb_osa_status_t USB_OsaSemDestroy(usb_osa_sem_handle handle)
-{
-    usb_osa_sem_struct_t *sem = (usb_osa_sem_struct_t *)handle;
-    USB_OSA_SR_ALLOC();
-
-    if (handle)
-    {
-        USB_OSA_ENTER_CRITICAL();
-        sem->isUsed = 0;
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_Success;
-    }
-    return kStatus_USB_OSA_Error;
-}
-
-usb_osa_status_t USB_OsaSemPost(usb_osa_sem_handle handle)
-{
-    usb_osa_sem_struct_t *sem = (usb_osa_sem_struct_t *)handle;
-    USB_OSA_SR_ALLOC();
-
-    if (!handle)
-    {
-        return kStatus_USB_OSA_Error;
-    }
-
-    USB_OSA_ENTER_CRITICAL();
-    sem->value++;
-    USB_OSA_EXIT_CRITICAL();
-    return kStatus_USB_OSA_Success;
-}
-
-usb_osa_status_t USB_OsaSemWait(usb_osa_sem_handle handle, uint32_t timeout)
-{
-    usb_osa_sem_struct_t *sem = (usb_osa_sem_struct_t *)handle;
-    USB_OSA_SR_ALLOC();
-
-    if (!handle)
-    {
-        return kStatus_USB_OSA_Error;
-    }
-
-    USB_OSA_ENTER_CRITICAL();
-    if (sem->value)
-    {
-        sem->value--;
-    }
-    else
-    {
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_TimeOut;
-    }
-    USB_OSA_EXIT_CRITICAL();
-    return kStatus_USB_OSA_Success;
-}
-
-usb_osa_status_t USB_OsaMutexCreate(usb_osa_mutex_handle *handle)
-{
-    if (!handle)
-    {
-        return kStatus_USB_OSA_Error;
-    }
-    *handle = (usb_osa_mutex_handle)0xFFFF0000U;
-    return kStatus_USB_OSA_Success;
-}
-
-usb_osa_status_t USB_OsaMutexDestroy(usb_osa_mutex_handle handle)
-{
-    return kStatus_USB_OSA_Success;
-}
-usb_osa_status_t USB_OsaMutexLock(usb_osa_mutex_handle handle)
-{
-    return kStatus_USB_OSA_Success;
-}
-usb_osa_status_t USB_OsaMutexUnlock(usb_osa_mutex_handle handle)
-{
-    return kStatus_USB_OSA_Success;
-}
-
-usb_osa_status_t USB_OsaMsgqCreate(usb_osa_msgq_handle *handle, uint32_t count, uint32_t size)
-{
-    usb_osa_msgq_struct_t *msgq = NULL;
-    USB_OSA_SR_ALLOC();
-
-    if (!handle)
-    {
-        return kStatus_USB_OSA_Error;
-    }
-    USB_OSA_ENTER_CRITICAL();
-
-    for (uint32_t i = 0; i < USB_OSA_BM_MSGQ_COUNT; i++)
-    {
-        if (0 == s_UsbBmMsgqStruct[i].isUsed)
-        {
-            msgq = &s_UsbBmMsgqStruct[i];
-            break;
-        }
-    }
-    if ((NULL == msgq) || (count > USB_OSA_BM_MSG_COUNT) || (size > USB_OSA_BM_MSG_SIZE))
-    {
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_Error;
-    }
-    msgq->count = count;
-    msgq->msgSize = size;
-    msgq->msgCount = 0U;
-    msgq->index = 0U;
-    msgq->current = 0U;
-    msgq->isUsed = 1;
-    *handle = msgq;
-    USB_OSA_EXIT_CRITICAL();
-    return kStatus_USB_OSA_Success;
-}
-
-usb_osa_status_t USB_OsaMsgqDestroy(usb_osa_msgq_handle handle)
-{
-    usb_osa_msgq_struct_t *msgq = (usb_osa_msgq_struct_t *)handle;
-    USB_OSA_SR_ALLOC();
-
-    if (!handle)
-    {
-        return kStatus_USB_OSA_Error;
-    }
-    USB_OSA_ENTER_CRITICAL();
-    msgq->isUsed = 0;
-    USB_OSA_EXIT_CRITICAL();
-    return kStatus_USB_OSA_Success;
-}
-
-usb_osa_status_t USB_OsaMsgqSend(usb_osa_msgq_handle handle, void *msg)
-{
-    usb_osa_msgq_struct_t *msgq = (usb_osa_msgq_struct_t *)handle;
-    usb_osa_msg_struct_t *msgEntity;
-    uint32_t *p;
-    uint32_t *q;
-    uint32_t count;
-    USB_OSA_SR_ALLOC();
-
-    if (!handle)
-    {
-        return kStatus_USB_OSA_Error;
-    }
-    USB_OSA_ENTER_CRITICAL();
-    if (msgq->msgCount >= msgq->count)
-    {
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_Error;
-    }
-
-    msgEntity = &msgq->msgs[msgq->index];
-    p = (uint32_t *)&msgEntity->msg[0];
-    q = (uint32_t *)msg;
-
-    for (count = 0U; count < msgq->msgSize; count++)
-    {
-        p[count] = q[count];
-    }
-
-    if (0U == msgq->msgCount)
-    {
-        msgq->current = msgq->index;
-    }
-
-    msgq->msgCount++;
-    msgq->index++;
-    msgq->index = msgq->index % msgq->count;
-
-    USB_OSA_EXIT_CRITICAL();
-
-    return kStatus_USB_OSA_Success;
-}
-
-usb_osa_status_t USB_OsaMsgqRecv(usb_osa_msgq_handle handle, void *msg, uint32_t timeout)
-{
-    usb_osa_msgq_struct_t *msgq = (usb_osa_msgq_struct_t *)handle;
-    usb_osa_msg_struct_t *msgEntity;
-    uint32_t *p;
-    uint32_t *q;
-    uint32_t count;
-    USB_OSA_SR_ALLOC();
-
-    if (!handle)
-    {
-        return kStatus_USB_OSA_Error;
-    }
-    USB_OSA_ENTER_CRITICAL();
-    if (msgq->msgCount < 1U)
-    {
-        USB_OSA_EXIT_CRITICAL();
-        return kStatus_USB_OSA_TimeOut;
-    }
-
-    msgEntity = &msgq->msgs[msgq->current];
-    q = (uint32_t *)&msgEntity->msg[0];
-    p = (uint32_t *)msg;
-
-    for (count = 0U; count < msgq->msgSize; count++)
-    {
-        p[count] = q[count];
-    }
-
-    msgq->msgCount--;
-    msgq->current++;
-    msgq->current = msgq->current % msgq->count;
-
-    USB_OSA_EXIT_CRITICAL();
-
-    return kStatus_USB_OSA_Success;
-}
-
-usb_osa_status_t USB_OsaMsgqCheck(usb_osa_msgq_handle handle, void *msg)
-{
-    usb_osa_msgq_struct_t *msgq = (usb_osa_msgq_struct_t *)handle;
-    uint32_t msgCount;
-    USB_OSA_SR_ALLOC();
-
-    if (!handle)
-    {
-        return kStatus_USB_OSA_Error;
-    }
-
-    USB_OSA_ENTER_CRITICAL();
-    msgCount = msgq->msgCount;
-    USB_OSA_EXIT_CRITICAL();
-
-    if (msgCount)
-    {
-        if (kStatus_USB_OSA_Success == USB_OsaMsgqRecv(msgq, msg, 0U))
-        {
-            return kStatus_USB_OSA_Success;
-        }
-    }
-
-    return kStatus_USB_OSA_Error;
+    __set_PRIMASK(sr);
 }
diff --git a/platform/mcu/MK22FN512xxx12/drivers/usb/virtual_com.c b/platform/mcu/MK22FN512xxx12/drivers/usb/virtual_com.c
index 11651b1d..74aa30c6 100644
--- a/platform/mcu/MK22FN512xxx12/drivers/usb/virtual_com.c
+++ b/platform/mcu/MK22FN512xxx12/drivers/usb/virtual_com.c
@@ -44,27 +44,8 @@
 
 #include "usb_device_descriptor.h"
 #include "virtual_com.h"
-#if (defined(FSL_FEATURE_SOC_SYSMPU_COUNT) && (FSL_FEATURE_SOC_SYSMPU_COUNT > 0U))
-#include "fsl_sysmpu.h"
-#endif /* FSL_FEATURE_SOC_SYSMPU_COUNT */
-#if defined(USB_DEVICE_CONFIG_EHCI) && (USB_DEVICE_CONFIG_EHCI > 0)
-#include "usb_phy.h"
-#endif
-#if defined(FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED) && (FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED > 0U) && \
-    defined(USB_DEVICE_CONFIG_KEEP_ALIVE_MODE) && (USB_DEVICE_CONFIG_KEEP_ALIVE_MODE > 0U) &&             \
-    defined(FSL_FEATURE_USB_KHCI_USB_RAM) && (FSL_FEATURE_USB_KHCI_USB_RAM > 0U)
-#include "fsl_smc.h"
-#endif
-
 #include "fsl_common.h"
 
-/*******************************************************************************
-* Definitions
-******************************************************************************/
-/* USB clock source and frequency*/
-#define USB_FS_CLK_SRC kCLOCK_UsbSrcIrc48M
-#define USB_FS_CLK_FREQ 48000000U
-
 /*******************************************************************************
 * Variables
 ******************************************************************************/
@@ -98,12 +79,7 @@ USB_DATA_ALIGNMENT static uint8_t s_currSendBuf[DATA_BUFF_SIZE];
 volatile static uint32_t s_recvSize = 0;
 volatile static uint32_t s_sendSize = 0;
 static uint32_t s_usbBulkMaxPacketSize = FS_CDC_VCOM_BULK_OUT_PACKET_SIZE;
-#if defined(FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED) && (FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED > 0U) && \
-    defined(USB_DEVICE_CONFIG_KEEP_ALIVE_MODE) && (USB_DEVICE_CONFIG_KEEP_ALIVE_MODE > 0U) &&             \
-    defined(FSL_FEATURE_USB_KHCI_USB_RAM) && (FSL_FEATURE_USB_KHCI_USB_RAM > 0U)
-volatile static uint8_t s_waitForDataReceive = 0;
-volatile static uint8_t s_comOpen = 0;
-#endif
+
 /*******************************************************************************
 * Prototypes
 ******************************************************************************/
@@ -163,12 +139,6 @@ usb_status_t USB_DeviceCdcAcmBulkIn(usb_device_handle handle,
             /* User: add your own code for send complete event */
             /* Schedule buffer for next receive event */
             USB_DeviceRecvRequest(handle, USB_CDC_VCOM_BULK_OUT_ENDPOINT, s_currRecvBuf, s_usbBulkMaxPacketSize);
-#if defined(FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED) && (FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED > 0U) && \
-    defined(USB_DEVICE_CONFIG_KEEP_ALIVE_MODE) && (USB_DEVICE_CONFIG_KEEP_ALIVE_MODE > 0U) &&             \
-    defined(FSL_FEATURE_USB_KHCI_USB_RAM) && (FSL_FEATURE_USB_KHCI_USB_RAM > 0U)
-            s_waitForDataReceive = 1;
-            USB0->INTEN &= ~USB_INTEN_SOFTOKEN_MASK;
-#endif
         }
     }
     else
@@ -198,22 +168,10 @@ usb_status_t USB_DeviceCdcAcmBulkOut(usb_device_handle handle,
     {
         s_recvSize = message->length;
 
-#if defined(FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED) && (FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED > 0U) && \
-    defined(USB_DEVICE_CONFIG_KEEP_ALIVE_MODE) && (USB_DEVICE_CONFIG_KEEP_ALIVE_MODE > 0U) &&             \
-    defined(FSL_FEATURE_USB_KHCI_USB_RAM) && (FSL_FEATURE_USB_KHCI_USB_RAM > 0U)
-        s_waitForDataReceive = 0;
-        USB0->INTEN |= USB_INTEN_SOFTOKEN_MASK;
-#endif
         if (!s_recvSize)
         {
             /* Schedule buffer for next receive event */
             USB_DeviceRecvRequest(handle, USB_CDC_VCOM_BULK_OUT_ENDPOINT, s_currRecvBuf, s_usbBulkMaxPacketSize);
-#if defined(FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED) && (FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED > 0U) && \
-    defined(USB_DEVICE_CONFIG_KEEP_ALIVE_MODE) && (USB_DEVICE_CONFIG_KEEP_ALIVE_MODE > 0U) &&             \
-    defined(FSL_FEATURE_USB_KHCI_USB_RAM) && (FSL_FEATURE_USB_KHCI_USB_RAM > 0U)
-            s_waitForDataReceive = 1;
-            USB0->INTEN &= ~USB_INTEN_SOFTOKEN_MASK;
-#endif
         }
     }
     return error;
@@ -421,14 +379,6 @@ usb_status_t USB_DeviceProcessClassRequest(usb_device_handle handle,
                 if (1 == s_cdcVcom.attach)
                 {
                     s_cdcVcom.startTransactions = 1;
-#if defined(FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED) && (FSL_FEATURE_USB_KHCI_KEEP_ALIVE_ENABLED > 0U) && \
-    defined(USB_DEVICE_CONFIG_KEEP_ALIVE_MODE) && (USB_DEVICE_CONFIG_KEEP_ALIVE_MODE > 0U) &&             \
-    defined(FSL_FEATURE_USB_KHCI_USB_RAM) && (FSL_FEATURE_USB_KHCI_USB_RAM > 0U)
-                    s_waitForDataReceive = 1;
-                    USB0->INTEN &= ~USB_INTEN_SOFTOKEN_MASK;
-                    s_comOpen = 1;
-                    usb_echo("USB_APP_CDC_DTE_ACTIVATED\r\n");
-#endif
                 }
             }
             else
diff --git a/platform/mcu/MK22FN512xxx12/drivers/usb/virtual_com.h b/platform/mcu/MK22FN512xxx12/drivers/usb/virtual_com.h
index ab50c7b9..467438cd 100644
--- a/platform/mcu/MK22FN512xxx12/drivers/usb/virtual_com.h
+++ b/platform/mcu/MK22FN512xxx12/drivers/usb/virtual_com.h
@@ -36,27 +36,10 @@
 /*******************************************************************************
 * Definitions
 ******************************************************************************/
-#if defined(USB_DEVICE_CONFIG_EHCI) && (USB_DEVICE_CONFIG_EHCI > 0)
-#define CONTROLLER_ID kUSB_ControllerEhci0
-#define DATA_BUFF_SIZE HS_CDC_VCOM_BULK_OUT_PACKET_SIZE
 
-#endif
-#if defined(USB_DEVICE_CONFIG_KHCI) && (USB_DEVICE_CONFIG_KHCI > 0)
 #define CONTROLLER_ID kUSB_ControllerKhci0
 #define DATA_BUFF_SIZE FS_CDC_VCOM_BULK_OUT_PACKET_SIZE
 
-#endif
-#if defined(USB_DEVICE_CONFIG_LPCIP3511FS) && (USB_DEVICE_CONFIG_LPCIP3511FS > 0U)
-#define CONTROLLER_ID kUSB_ControllerLpcIp3511Fs0
-#define DATA_BUFF_SIZE FS_CDC_VCOM_BULK_OUT_PACKET_SIZE
-
-#endif
-
-#if defined(USB_DEVICE_CONFIG_LPCIP3511HS) && (USB_DEVICE_CONFIG_LPCIP3511HS > 0U)
-#define CONTROLLER_ID kUSB_ControllerLpcIp3511Hs0
-#define DATA_BUFF_SIZE HS_CDC_VCOM_BULK_OUT_PACKET_SIZE
-#endif
-
 #define USB_DEVICE_INTERRUPT_PRIORITY (3U)
 
 /* Currently configured line coding */