diff --git a/examples/acomp/main.c b/examples/acomp/main.c
new file mode 100644
index 00000000..2f354a83
--- /dev/null
+++ b/examples/acomp/main.c
@@ -0,0 +1,59 @@
+/**
+ * @file main.c
+ * @brief
+ *
+ * Copyright (c) 2021 Bouffalolab team
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+#include "hal_pm.h"
+#include "hal_acomp.h"
+#include "hal_uart.h"
+
+void pm_irq_callback(enum pm_event_type event)
+{
+    if (event == PM_HBN_ACOMP0_WAKEUP_EVENT) {
+        MSG("acomp0 int\r\n");
+    } else if (event == PM_HBN_ACOMP1_WAKEUP_EVENT) {
+        MSG("acomp1 int\r\n");
+    }
+}
+
+int main(void)
+{
+    bflb_platform_init(0);
+
+    pm_hbn_out1_irq_register();
+    acomp_device_t acomp_device;
+    acomp_device.id = 1;
+    acomp_device.pos_ch = ACOMP_CHANNEL_ADC_CHANNEL6; //GPIO7
+    acomp_device.neg_ch = ACOMP_CHANNEL_0P375VBAT;
+    acomp_device.pos_hysteresis_vol = ACOMP_HYSTERESIS_VOLT_50MV;
+    acomp_device.neg_hysteresis_vol = ACOMP_HYSTERESIS_VOLT_50MV;
+    acomp_init(&acomp_device);
+
+    acomp_device.id = 0;
+    acomp_device.pos_ch = ACOMP_CHANNEL_ADC_CHANNEL2; //GPIO17
+    acomp_device.neg_ch = ACOMP_CHANNEL_0P375VBAT;
+    acomp_device.pos_hysteresis_vol = ACOMP_HYSTERESIS_VOLT_50MV;
+    acomp_device.neg_hysteresis_vol = ACOMP_HYSTERESIS_VOLT_50MV;
+    acomp_init(&acomp_device);
+
+    while (1) {
+        bflb_platform_delay_ms(100);
+    }
+}
diff --git a/examples/gpio/gpio_int/main.c b/examples/gpio/gpio_int/main.c
index a3aaff3b..bf150a08 100644
--- a/examples/gpio/gpio_int/main.c
+++ b/examples/gpio/gpio_int/main.c
@@ -22,25 +22,28 @@
  */
 #include "hal_gpio.h"
 
-static void gpio11_int_callback(uint32_t pin)
+static void gpio_int_callback(uint32_t pin)
 {
-    MSG("gpio rising trigger !\r\n");
-}
-static void gpio12_int_callback(uint32_t pin)
-{
-    MSG("gpio high level int !\r\n");
+    MSG("gpio :%d rising trigger !\r\n", pin);
 }
 
 int main(void)
 {
     bflb_platform_init(0);
 
-    gpio_set_mode(GPIO_PIN_11, GPIO_SYNC_RISING_TRIGER_INT_MODE);
-    gpio_attach_irq(GPIO_PIN_11, gpio11_int_callback);
-    gpio_irq_enable(GPIO_PIN_11, ENABLE);
-    gpio_set_mode(GPIO_PIN_12, GPIO_SYNC_HIGH_LEVEL_INT_MODE);
-    gpio_attach_irq(GPIO_PIN_12, gpio12_int_callback);
-    gpio_irq_enable(GPIO_PIN_12, ENABLE);
+    gpio_set_mode(GPIO_PIN_18, GPIO_SYNC_FALLING_TRIGER_INT_MODE);
+    gpio_attach_irq(GPIO_PIN_18, gpio_int_callback);
+    gpio_irq_enable(GPIO_PIN_18, ENABLE);
+    gpio_set_mode(GPIO_PIN_19, GPIO_SYNC_FALLING_TRIGER_INT_MODE);
+    gpio_attach_irq(GPIO_PIN_19, gpio_int_callback);
+    gpio_irq_enable(GPIO_PIN_19, ENABLE);
+    gpio_set_mode(GPIO_PIN_20, GPIO_SYNC_RISING_TRIGER_INT_MODE);
+    gpio_attach_irq(GPIO_PIN_20, gpio_int_callback);
+    gpio_irq_enable(GPIO_PIN_20, ENABLE);
+    gpio_set_mode(GPIO_PIN_21, GPIO_SYNC_RISING_TRIGER_INT_MODE);
+    gpio_attach_irq(GPIO_PIN_21, gpio_int_callback);
+    gpio_irq_enable(GPIO_PIN_21, ENABLE);
+
     MSG("gpio int test !\r\n");
 
     BL_CASE_SUCCESS;
diff --git a/examples/i2c/i2c_ssd1306/main.c b/examples/i2c/i2c_ssd1306/main.c
new file mode 100644
index 00000000..9d712892
--- /dev/null
+++ b/examples/i2c/i2c_ssd1306/main.c
@@ -0,0 +1,41 @@
+/**
+ * @file main.c
+ * @brief
+ *
+ * Copyright (c) 2021 Bouffalolab team
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+#include "ssd1306.h"
+#include "hal_uart.h"
+
+int main(void)
+{
+    bflb_platform_init(0);
+    ssd1306_init();
+    ssd1306_clear_screen(0x00);
+    ssd1306_display_off();
+
+    ssd1306_display_string(2, 0, "hello, bouffalo!", 16, 1);
+    ssd1306_display_string(2, 18, "this is an i2c driver demo!", 16, 1);
+    ssd1306_refresh_gram();
+    ssd1306_display_on();
+
+    while (1) {
+        bflb_platform_delay_ms(100);
+    }
+}
\ No newline at end of file
diff --git a/examples/i2s/i2s_play_from_flash/CMakeLists.txt b/examples/i2s/i2s_play_from_flash/CMakeLists.txt
index 240ea3d5..8a8d27bd 100644
--- a/examples/i2s/i2s_play_from_flash/CMakeLists.txt
+++ b/examples/i2s/i2s_play_from_flash/CMakeLists.txt
@@ -1,7 +1,7 @@
 set(BSP_COMMON_DIR ${CMAKE_SOURCE_DIR}/bsp/bsp_common)
 set(TARGET_REQUIRED_LIBS fatfs)
-set(TARGET_REQUIRED_PRIVATE_INCLUDE ${BSP_COMMON_DIR}/es8388 ${BSP_COMMON_DIR}/spi_sd)
-set(TARGET_REQUIRED_SRCS ${BSP_COMMON_DIR}/es8388/bsp_es8388.c ${BSP_COMMON_DIR}/fatfs/fatfs_spi_sd.c ${BSP_COMMON_DIR}/spi_sd/bsp_spi_sd.c)
+set(TARGET_REQUIRED_PRIVATE_INCLUDE ${BSP_COMMON_DIR}/es8388 ${BSP_COMMON_DIR}/wm8978 ${BSP_COMMON_DIR}/spi_sd)
+set(TARGET_REQUIRED_SRCS ${BSP_COMMON_DIR}/es8388/bsp_es8388.c ${BSP_COMMON_DIR}/wm8978/wm8978.c ${BSP_COMMON_DIR}/fatfs/fatfs_spi_sd.c ${BSP_COMMON_DIR}/spi_sd/bsp_spi_sd.c)
 set(mains main.c)
 generate_bin()
 
diff --git a/examples/lvgl/CMakeLists.txt b/examples/lvgl/CMakeLists.txt
index e8818fcc..2057d8b4 100644
--- a/examples/lvgl/CMakeLists.txt
+++ b/examples/lvgl/CMakeLists.txt
@@ -1,9 +1,9 @@
 set(BSP_COMMON_DIR ${CMAKE_SOURCE_DIR}/bsp/bsp_common)
 set(TARGET_REQUIRED_LIBS fatfs lvgl)
-set(LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/lvgl_flash.ld)
-set(TARGET_REQUIRED_PRIVATE_INCLUDE ${BSP_COMMON_DIR}/il9341 ${BSP_COMMON_DIR}/lvgl ${BSP_COMMON_DIR}/touch ${BSP_COMMON_DIR}/spi_sd)
+set(TARGET_REQUIRED_PRIVATE_INCLUDE ${BSP_COMMON_DIR}/mcu_lcd  ${BSP_COMMON_DIR}/lvgl ${BSP_COMMON_DIR}/touch ${BSP_COMMON_DIR}/spi_sd)
 file(GLOB_RECURSE sources "${CMAKE_CURRENT_SOURCE_DIR}/demo/*.c")
-set(TARGET_REQUIRED_SRCS ${sources} ${BSP_COMMON_DIR}/il9341/bsp_il9341.c ${BSP_COMMON_DIR}/lvgl/lv_port_disp.c ${BSP_COMMON_DIR}/lvgl/lv_port_indev.c ${BSP_COMMON_DIR}/lvgl/lv_port_fs.c
+set(TARGET_REQUIRED_SRCS ${BSP_COMMON_DIR}/lvgl/lv_port_disp.c ${sources} ${BSP_COMMON_DIR}/mcu_lcd/mcu_lcd.c ${BSP_COMMON_DIR}/mcu_lcd/ili9341.c ${BSP_COMMON_DIR}/mcu_lcd/st7735s.c ${BSP_COMMON_DIR}/mcu_lcd/st7789v.c ${BSP_COMMON_DIR}/mcu_lcd/font.c
+ ${BSP_COMMON_DIR}/lvgl/lv_port_indev.c ${BSP_COMMON_DIR}/lvgl/lv_port_fs.c
 ${BSP_COMMON_DIR}/touch/xpt2046.c ${BSP_COMMON_DIR}/touch/touch.c ${BSP_COMMON_DIR}/fatfs/fatfs_spi_sd.c ${BSP_COMMON_DIR}/spi_sd/bsp_spi_sd.c)
 set(mains main.c)
 generate_bin()
diff --git a/examples/lvgl/main.c b/examples/lvgl/main.c
index 0a2497dd..b98834ec 100644
--- a/examples/lvgl/main.c
+++ b/examples/lvgl/main.c
@@ -34,7 +34,6 @@
 #include "hal_gpio.h"
 #include "hal_dma.h"
 
-#include "bsp_il9341.h"
 #include "xpt2046.h"
 #include "lv_port_disp.h"
 #include "lv_port_indev.h"
diff --git a/examples/pm/hbn_mode_wakeup/CMakeLists.txt b/examples/pm/hbn_mode_wakeup/CMakeLists.txt
new file mode 100644
index 00000000..27d34535
--- /dev/null
+++ b/examples/pm/hbn_mode_wakeup/CMakeLists.txt
@@ -0,0 +1,4 @@
+set(TARGET_REQUIRED_LIBS shell)
+set(mains main.c)
+generate_bin()
+
diff --git a/examples/pm/pds_mode_wakeup/CMakeLists.txt b/examples/pm/pds_mode_wakeup/CMakeLists.txt
new file mode 100644
index 00000000..27d34535
--- /dev/null
+++ b/examples/pm/pds_mode_wakeup/CMakeLists.txt
@@ -0,0 +1,4 @@
+set(TARGET_REQUIRED_LIBS shell)
+set(mains main.c)
+generate_bin()
+
diff --git a/examples/pm/pds_mode_wakeup/main.c b/examples/pm/pds_mode_wakeup/main.c
new file mode 100644
index 00000000..94f6de3e
--- /dev/null
+++ b/examples/pm/pds_mode_wakeup/main.c
@@ -0,0 +1,77 @@
+/**
+ * @file main.c
+ * @brief
+ *
+ * Copyright (c) 2021 Bouffalolab team
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+#include "hal_uart.h"
+#include "hal_pm.h"
+#include "hal_gpio.h"
+#include "shell.h"
+
+void shell_irq_callback(struct device *dev, void *args, uint32_t size, uint32_t state)
+{
+    uint8_t data;
+    if (state == UART_EVENT_RX_FIFO) {
+        data = *(uint8_t *)args;
+        shell_handler(data);
+    }
+}
+
+static void gpio_int_callback(uint32_t pin)
+{
+    MSG("gpio :%d rising trigger !\r\n", pin);
+}
+
+int main(void)
+{
+    bflb_platform_init(0);
+    shell_init();
+    struct device *uart = device_find("debug_log");
+    if (uart) {
+        device_set_callback(uart, shell_irq_callback);
+        device_control(uart, DEVICE_CTRL_SET_INT, (void *)(UART_RX_FIFO_IT));
+    }
+    gpio_attach_irq(GPIO_PIN_10, gpio_int_callback);
+    gpio_irq_enable(GPIO_PIN_10, ENABLE); //only used for level3
+    while (1) {
+        bflb_platform_delay_ms(100);
+    }
+}
+
+int pds3_enter(int argc, char *argv[])
+{
+    MSG("gpio wake up case,enter pds3 mode\r\n");
+    bflb_platform_delay_ms(50);
+
+    pm_pds_mode_enter(PM_PDS_LEVEL_3, 0); /*hbn、pds、exti gpio can wakeup*/
+    BL_CASE_SUCCESS;                      /*level 3 can run here*/
+    return 0;
+}
+int pds31_enter(int argc, char *argv[])
+{
+    MSG("gpio wake up case,enter pds31 mode\r\n");
+    bflb_platform_delay_ms(50);
+
+    pm_pds_mode_enter(PM_PDS_LEVEL_31, 0); /*hbn、pds gpio can wakeup*/
+
+    return 0;
+}
+SHELL_CMD_EXPORT(pds3_enter, pds3 gpio wakeup test)
+SHELL_CMD_EXPORT(pds31_enter, pds31 gpio wakeup test)
\ No newline at end of file
diff --git a/examples/usb/usb2uart/dev_cfg.h b/examples/usb/usb2uart/dev_cfg.h
new file mode 100644
index 00000000..c4d40268
--- /dev/null
+++ b/examples/usb/usb2uart/dev_cfg.h
@@ -0,0 +1,7 @@
+#ifndef DEV_CFG_H
+#define DEV_CFG_H
+
+#define UART_DTR_PIN GPIO_PIN_22
+#define UART_RTS_PIN GPIO_PIN_21
+
+#endif
\ No newline at end of file
diff --git a/examples/usb/usb2uart/main.c b/examples/usb/usb2uart/main.c
index 7cf2e559..7274f376 100644
--- a/examples/usb/usb2uart/main.c
+++ b/examples/usb/usb2uart/main.c
@@ -27,6 +27,7 @@
 #include "bl702_ef_ctrl.h"
 #include "bl702_glb.h"
 #include "hal_gpio.h"
+#include "dev_cfg.h"
 
 #define CDC_IN_EP  0x82
 #define CDC_OUT_EP 0x01
@@ -256,9 +257,6 @@ usbd_endpoint_t cdc_in_ep = {
 
 extern struct device *usb_dc_init(void);
 
-#define UART_DTR_PIN GPIO_PIN_22
-#define UART_RTS_PIN GPIO_PIN_21
-
 int main(void)
 {
     uint8_t chipid[8];
diff --git a/examples/usb/usb_cdc_loopback/main.c b/examples/usb/usb_cdc_loopback/main.c
index 7801bc92..eb463388 100644
--- a/examples/usb/usb_cdc_loopback/main.c
+++ b/examples/usb/usb_cdc_loopback/main.c
@@ -124,6 +124,8 @@ void usbd_cdc_acm_bulk_out(uint8_t ep)
     usbd_ep_read(ep, NULL, 0, NULL);
 
     usbd_ep_write(CDC_IN_EP, out_buffer, actual_read_length, NULL);
+    if (actual_read_length == 64)
+        usbd_ep_write(CDC_IN_EP, NULL, 0, NULL);
 }
 
 void usbd_cdc_acm_bulk_in(uint8_t ep)