diff --git a/examples/usb/usb2uart/main.c b/examples/usb/usb2uart/main.c
index 7274f376..62c8eaf1 100644
--- a/examples/usb/usb2uart/main.c
+++ b/examples/usb/usb2uart/main.c
@@ -111,6 +111,7 @@ uint8_t cdc_descriptor[] = {
     'i', 0x00,                  /* wcChar20 */
     'a', 0x00,                  /* wcChar21 */
     'l', 0x00,                  /* wcChar22 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -124,11 +125,11 @@ uint8_t cdc_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 struct device *usb_fs;
-usbd_class_t cdc_class;
+
 uint8_t filter_buf[sizeof(USB_CDC_RESET_FILTER_PATTERN) + 1 + 1] = { 0 };
 
 static void hexarr2string(uint8_t *hexarray, int length, uint8_t *string)
diff --git a/examples/usb/usb_audio_mic_speaker/main.c b/examples/usb/usb_audio_mic_speaker/main.c
index 5fb9d440..cbe27a79 100644
--- a/examples/usb/usb_audio_mic_speaker/main.c
+++ b/examples/usb/usb_audio_mic_speaker/main.c
@@ -381,6 +381,7 @@ USB_DESC_SECTION const uint8_t audio_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -394,7 +395,7 @@ USB_DESC_SECTION const uint8_t audio_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
@@ -417,6 +418,8 @@ static uint8_t record_data_buff[2][BUFF_SIZE + 128] __attribute__((section(".sys
 volatile static uint8_t play_buff_using_num = 0, play_updata_flag = 0;
 static uint8_t play_data_buff[2][BUFF_SIZE + 128] __attribute__((section(".system_ram"), aligned(4)));
 
+static uint8_t vol_change_flag = 0;
+
 static ES8388_Cfg_Type ES8388Cfg = {
     .work_mode = ES8388_CODEC_MDOE,          /*!< ES8388 work mode */
     .role = ES8388_SLAVE,                    /*!< ES8388 role */
@@ -462,9 +465,9 @@ void usbd_audio_set_interface_callback(uint8_t value)
 {
     if (value) {
         play_status = 1;
-        MSG("OPEN\r\n");
         device_control(usb_fs, DEVICE_CTRL_USB_DC_SET_ACK, (void *)0x81);
         device_control(usb_fs, DEVICE_CTRL_USB_DC_SET_ACK, (void *)0x2);
+        MSG("OPEN\r\n");
     } else {
         play_status = 0;
         usb_data_offset = 0;
@@ -477,23 +480,14 @@ static usbd_endpoint_t audio_out_ep = {
     .ep_addr = AUDIO_OUT_EP
 };
 
-// static usbd_endpoint_t audio_in_ep = {
-//     .ep_cb = NULL,
-//     .ep_addr = AUDIO_IN_EP
-// };
 void usbd_audio_set_volume(uint8_t vol)
 {
-    ES8388_Set_Voice_Volume(vol);
+    vol_change_flag = vol;
 }
+
 extern struct device *usb_dc_init(void);
 struct device *dma_ch4_usb_tx;
 
-uint32_t audio_pos = 0;
-uint32_t musci_size = 0;
-uint32_t frame_count = 0;
-uint32_t frame_cnt = 0;
-uint32_t last_frame_size = 0;
-
 static void dma_ch2_i2s_tx_irq_callback(struct device *dev, void *args, uint32_t size, uint32_t state)
 {
     // if (play_updata_flag) {
@@ -561,8 +555,8 @@ void audio_init()
         device_control(i2s, DEVICE_CTRL_ATTACH_TX_DMA, (void *)dma_ch2_i2s_tx);
 
         /* Set the interrupt function, for double buffering*/
-        device_set_callback(dma_ch2_i2s_tx, dma_ch2_i2s_tx_irq_callback);
-        device_control(dma_ch2_i2s_tx, DEVICE_CTRL_SET_INT, NULL);
+        device_set_callback(I2S_DEV(i2s)->tx_dma, dma_ch2_i2s_tx_irq_callback);
+        device_control(I2S_DEV(i2s)->tx_dma, DEVICE_CTRL_SET_INT, NULL);
     }
 
     dma_register(DMA0_CH3_INDEX, "dma_ch3_i2s_rx");
@@ -582,8 +576,8 @@ void audio_init()
         device_control(i2s, DEVICE_CTRL_ATTACH_RX_DMA, (void *)dma_ch3_i2s_rx);
 
         /* Set the interrupt function, for double buffering*/
-        device_set_callback(dma_ch3_i2s_rx, dma_ch3_i2s_rx_irq_callback);
-        device_control(dma_ch3_i2s_rx, DEVICE_CTRL_SET_INT, NULL);
+        device_set_callback(I2S_DEV(i2s)->rx_dma, dma_ch3_i2s_rx_irq_callback);
+        device_control(I2S_DEV(i2s)->rx_dma, DEVICE_CTRL_SET_INT, NULL);
     }
 }
 
@@ -646,6 +640,11 @@ int main(void)
             usb_data_offset = 0;
         }
 
+        if (vol_change_flag) {
+            ES8388_Set_Voice_Volume(vol_change_flag);
+            vol_change_flag = 0;
+        }
+
         __asm volatile("nop");
         __asm volatile("nop");
     }
diff --git a/examples/usb/usb_audio_mouse/main.c b/examples/usb/usb_audio_mouse/main.c
index 1a847ade..8d3abd69 100644
--- a/examples/usb/usb_audio_mouse/main.c
+++ b/examples/usb/usb_audio_mouse/main.c
@@ -297,6 +297,7 @@ USB_DESC_SECTION const uint8_t audio_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -310,7 +311,7 @@ USB_DESC_SECTION const uint8_t audio_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
diff --git a/examples/usb/usb_cdc_acm2/main.c b/examples/usb/usb_cdc_acm2/main.c
index 44bc30e4..764906df 100644
--- a/examples/usb/usb_cdc_acm2/main.c
+++ b/examples/usb/usb_cdc_acm2/main.c
@@ -94,6 +94,7 @@ USB_DESC_SECTION const uint8_t cdc_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -107,7 +108,7 @@ USB_DESC_SECTION const uint8_t cdc_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
diff --git a/examples/usb/usb_cdc_loopback/main.c b/examples/usb/usb_cdc_loopback/main.c
index eb463388..808ae35c 100644
--- a/examples/usb/usb_cdc_loopback/main.c
+++ b/examples/usb/usb_cdc_loopback/main.c
@@ -93,6 +93,7 @@ USB_DESC_SECTION const uint8_t cdc_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -106,7 +107,7 @@ USB_DESC_SECTION const uint8_t cdc_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
diff --git a/examples/usb/usb_cdc_msc/CMakeLists.txt b/examples/usb/usb_cdc_msc/CMakeLists.txt
index 0c2da92b..2c7cc5fd 100644
--- a/examples/usb/usb_cdc_msc/CMakeLists.txt
+++ b/examples/usb/usb_cdc_msc/CMakeLists.txt
@@ -1,6 +1,5 @@
 set(BSP_COMMON_DIR ${CMAKE_SOURCE_DIR}/bsp/bsp_common)
 set(TARGET_REQUIRED_LIBS usb_stack)
-set(LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/usb_cdc_msc.ld)
 set(TARGET_REQUIRED_PRIVATE_INCLUDE ${BSP_COMMON_DIR}/usb ${BSP_COMMON_DIR}/spi_sd)
 set(TARGET_REQUIRED_SRCS ${BSP_COMMON_DIR}/usb/usb_dc.c ${BSP_COMMON_DIR}/usb/uart_interface.c ${BSP_COMMON_DIR}/spi_sd/bsp_spi_sd.c)
 set(mains main.c)
diff --git a/examples/usb/usb_cdc_msc/main.c b/examples/usb/usb_cdc_msc/main.c
index d2a42ed6..76bb379f 100644
--- a/examples/usb/usb_cdc_msc/main.c
+++ b/examples/usb/usb_cdc_msc/main.c
@@ -109,6 +109,7 @@ USB_DESC_SECTION const uint8_t cdc_msc_descriptor[] = {
     '3', 0x00,                  /* wcChar7 */
     '4', 0x00,                  /* wcChar8 */
     '5', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -122,7 +123,7 @@ USB_DESC_SECTION const uint8_t cdc_msc_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
diff --git a/examples/usb/usb_cdc_shell/CMakeLists.txt b/examples/usb/usb_cdc_shell/CMakeLists.txt
index 68a4f1e2..d01063ce 100644
--- a/examples/usb/usb_cdc_shell/CMakeLists.txt
+++ b/examples/usb/usb_cdc_shell/CMakeLists.txt
@@ -1,7 +1,7 @@
 set(BSP_COMMON_DIR ${CMAKE_SOURCE_DIR}/bsp/bsp_common)
 set(TARGET_REQUIRED_LIBS usb_stack shell)
 set(TARGET_REQUIRED_PRIVATE_INCLUDE ${BSP_COMMON_DIR}/usb)
-set(TARGET_REQUIRED_SRCS ${BSP_COMMON_DIR}/usb/usb_dc.c ${BSP_COMMON_DIR}/usb/uart_interface.c)
+set(TARGET_REQUIRED_SRCS ${BSP_COMMON_DIR}/usb/usb_dc.c)
 set(mains main.c)
 generate_bin()
 
diff --git a/examples/usb/usb_cdc_shell/main.c b/examples/usb/usb_cdc_shell/main.c
index 0c43d1b5..c46165e7 100644
--- a/examples/usb/usb_cdc_shell/main.c
+++ b/examples/usb/usb_cdc_shell/main.c
@@ -94,6 +94,7 @@ USB_DESC_SECTION const uint8_t cdc_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -107,7 +108,7 @@ USB_DESC_SECTION const uint8_t cdc_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
@@ -185,3 +186,10 @@ int main(void)
     while (1) {
     }
 }
+
+int enter_ota(int argc, char *argv[])
+{
+    hal_enter_usb_iap();
+    return 0;
+}
+SHELL_CMD_EXPORT(enter_ota, enter_ota test)
\ No newline at end of file
diff --git a/examples/usb/usb_cdc_video_psram/main.c b/examples/usb/usb_cdc_video_psram/main.c
index 2d470cee..351f7166 100644
--- a/examples/usb/usb_cdc_video_psram/main.c
+++ b/examples/usb/usb_cdc_video_psram/main.c
@@ -146,6 +146,7 @@ USB_DESC_SECTION const uint8_t cdc_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -159,7 +160,7 @@ USB_DESC_SECTION const uint8_t cdc_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
diff --git a/examples/usb/usb_hid_custom_keyboard/main.c b/examples/usb/usb_hid_custom_keyboard/main.c
index c70e86b4..30d7e202 100644
--- a/examples/usb/usb_hid_custom_keyboard/main.c
+++ b/examples/usb/usb_hid_custom_keyboard/main.c
@@ -164,6 +164,7 @@ USB_DESC_SECTION const uint8_t hid_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -177,7 +178,7 @@ USB_DESC_SECTION const uint8_t hid_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
diff --git a/examples/usb/usb_hid_keyboard/main.c b/examples/usb/usb_hid_keyboard/main.c
index ff689c24..a9cfb879 100644
--- a/examples/usb/usb_hid_keyboard/main.c
+++ b/examples/usb/usb_hid_keyboard/main.c
@@ -128,6 +128,7 @@ USB_DESC_SECTION const uint8_t hid_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -141,7 +142,7 @@ USB_DESC_SECTION const uint8_t hid_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
diff --git a/examples/usb/usb_hid_mouse/main.c b/examples/usb/usb_hid_mouse/main.c
index 0ce58888..bc027d93 100644
--- a/examples/usb/usb_hid_mouse/main.c
+++ b/examples/usb/usb_hid_mouse/main.c
@@ -128,6 +128,7 @@ USB_DESC_SECTION const uint8_t hid_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -141,7 +142,7 @@ USB_DESC_SECTION const uint8_t hid_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
diff --git a/examples/usb/usb_msc_ram/CMakeLists.txt b/examples/usb/usb_msc_ram/CMakeLists.txt
index 17a56ffb..38a71770 100644
--- a/examples/usb/usb_msc_ram/CMakeLists.txt
+++ b/examples/usb/usb_msc_ram/CMakeLists.txt
@@ -1,8 +1,7 @@
 set(BSP_COMMON_DIR ${CMAKE_SOURCE_DIR}/bsp/bsp_common)
 set(TARGET_REQUIRED_LIBS usb_stack)
-set(LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/usb_msc_ram.ld)
-set(TARGET_REQUIRED_PRIVATE_INCLUDE ${BSP_COMMON_DIR}/usb ${BSP_COMMON_DIR}/spi_sd)
-set(TARGET_REQUIRED_SRCS ${BSP_COMMON_DIR}/usb/usb_dc.c ${BSP_COMMON_DIR}/usb/uart_interface.c ${BSP_COMMON_DIR}/spi_sd/bsp_spi_sd.c)
+set(TARGET_REQUIRED_PRIVATE_INCLUDE ${BSP_COMMON_DIR}/usb)
+set(TARGET_REQUIRED_SRCS ${BSP_COMMON_DIR}/usb/usb_dc.c)
 set(mains main.c)
 generate_bin()
 
diff --git a/examples/usb/usb_msc_ram/main.c b/examples/usb/usb_msc_ram/main.c
index 34182303..a01a1632 100644
--- a/examples/usb/usb_msc_ram/main.c
+++ b/examples/usb/usb_msc_ram/main.c
@@ -92,6 +92,7 @@ USB_DESC_SECTION const uint8_t msc_ram_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -105,7 +106,7 @@ USB_DESC_SECTION const uint8_t msc_ram_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
diff --git a/examples/usb/usb_msc_sd/main.c b/examples/usb/usb_msc_sd/main.c
index ce29a789..68c66e14 100644
--- a/examples/usb/usb_msc_sd/main.c
+++ b/examples/usb/usb_msc_sd/main.c
@@ -95,6 +95,7 @@ USB_DESC_SECTION const uint8_t msc_ram_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -108,7 +109,7 @@ USB_DESC_SECTION const uint8_t msc_ram_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
diff --git a/examples/usb/usb_video/main.c b/examples/usb/usb_video/main.c
index 3ea0f4c7..30b90125 100644
--- a/examples/usb/usb_video/main.c
+++ b/examples/usb/usb_video/main.c
@@ -319,6 +319,7 @@ USB_DESC_SECTION const uint8_t video_descriptor[] = {
     '0', 0x00,                  /* wcChar7 */
     '0', 0x00,                  /* wcChar8 */
     '0', 0x00,                  /* wcChar9 */
+#ifdef CONFIG_USB_HS
     ///////////////////////////////////////
     /// device qualifier descriptor
     ///////////////////////////////////////
@@ -332,7 +333,7 @@ USB_DESC_SECTION const uint8_t video_descriptor[] = {
     0x40,
     0x01,
     0x00,
-
+#endif
     0x00
 };
 
@@ -340,8 +341,8 @@ static struct device *usb_fs;
 static struct device *dma_ch2;
 
 // static uint8_t header[2] = {0x02,0x00};
-uint8_t packet_buffer1[VIDEO_PACKET_SIZE] __attribute__((section(".tcm_code"))) = { 0x02, 0x00 };
-uint8_t packet_buffer2[VIDEO_PACKET_SIZE] __attribute__((section(".tcm_code"))) = { 0x02, 0x00 };
+ATTR_DTCM_SECTION uint8_t packet_buffer1[VIDEO_PACKET_SIZE] = { 0x02, 0x00 };
+ATTR_DTCM_SECTION uint8_t packet_buffer2[VIDEO_PACKET_SIZE] = { 0x02, 0x00 };
 static uint32_t picture_pos = 0;
 static uint32_t packets_cnt = 0;
 static uint32_t packets_in_frame;
diff --git a/examples/usb/usb_video/readme.md b/examples/usb/usb_video/readme.md
index 2e93acc5..fbf1ad9f 100644
--- a/examples/usb/usb_video/readme.md
+++ b/examples/usb/usb_video/readme.md
@@ -1,5 +1,3 @@
-**board/bl706_avb/pinmux_config.h** 中 **PINMUX_SELECT** 选择 **PINMUX_UVC**
-
 **bsp_common/image_sensor/bsp_image_sensor.c** 中**FORMAT_SEL** 选择 **UYVY**
 
 ```bash