diff --git a/bsp/stm32_radio/sdcard.c b/bsp/stm32_radio/sdcard.c
index c9e94c244b0d52ef341f0aef92a22a8f01d804a8..fbbc42aab335aa878d3c699db101b24a23d374db 100644
--- a/bsp/stm32_radio/sdcard.c
+++ b/bsp/stm32_radio/sdcard.c
@@ -2966,6 +2966,7 @@ static void DMA_RxConfiguration(uint32_t *BufferDST, uint32_t BufferSize)
 static struct rt_device sdcard_device;
 static SD_CardInfo SDCardInfo;
 static struct dfs_partition part;
+static struct rt_semaphore sd_lock;
 
 /* RT-Thread Device Driver Interface */
 static rt_err_t rt_sdcard_init(rt_device_t dev)
@@ -2978,6 +2979,11 @@ static rt_err_t rt_sdcard_init(rt_device_t dev)
 	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
 	NVIC_Init(&NVIC_InitStructure);
 
+	if (rt_sem_init(&sd_lock, "sdlock", 1, RT_IPC_FLAG_FIFO) != RT_EOK)
+	{
+		rt_kprintf("init sd lock semaphore failed\n");
+	}
+
 	return RT_EOK;
 }
 
@@ -3001,6 +3007,7 @@ static rt_size_t rt_sdcard_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_
 
 	// rt_kprintf("read: 0x%x, size %d\n", pos, size);
 
+	rt_sem_take(&sd_lock, RT_WAITING_FOREVER);
 	retry = 3;
 	/* read all sectors */
 	for (i = 0; i < size / SECTOR_SIZE; i ++)
@@ -3012,14 +3019,15 @@ __retry:
 		if (status != SD_OK)
 		{
 			if (--retry != 0) goto __retry;
-			rt_kprintf("sd card read failed, status 0x%08x\n", status);
-			return 0;
+			break;
 		}
 	}
 
+	rt_sem_release(&sd_lock);
+
 	if (status == SD_OK) return size;
 
-	rt_kprintf("read failed: %d\n", status);
+	rt_kprintf("read failed: %d, buffer 0x%08x\n", status, buffer);
 	return 0;
 }
 
@@ -3030,7 +3038,9 @@ static rt_size_t rt_sdcard_write (rt_device_t dev, rt_off_t pos, const void* buf
 
 	// rt_kprintf("write: 0x%x, size %d\n", pos, size);
 
-	/* read all sectors */
+	rt_sem_take(&sd_lock, RT_WAITING_FOREVER);
+
+	/* write all sectors */
 	for (i = 0; i < size / SECTOR_SIZE; i ++)
 	{
 		status = SD_WriteBlock((part.offset + i)* SECTOR_SIZE + pos,
@@ -3039,13 +3049,14 @@ static rt_size_t rt_sdcard_write (rt_device_t dev, rt_off_t pos, const void* buf
 		if (status != SD_OK)
 		{
 			rt_kprintf("sd card write failed\n");
-			return 0;
+			break;
 		}
 	}
 
+	rt_sem_release(&sd_lock);
 	if (status == SD_OK) return size;
 
-	rt_kprintf("write failed: %d\n", status);
+	rt_kprintf("write failed: %d, buffer 0x%08x\n", status, buffer);
 	return 0;
 }
 
@@ -3119,3 +3130,4 @@ void rt_hw_sdcard_init()
 __return:
 	rt_kprintf("sdcard init failed\n");
 }
+
diff --git a/rtgui/common/asc16font.c b/rtgui/common/asc16font.c
index 4af71da2d660d41b4dfe9e2fceaad540de0e67b6..81ee349551f53c2e1eb9fd1a9d25557ec33b74fd 100644
--- a/rtgui/common/asc16font.c
+++ b/rtgui/common/asc16font.c
@@ -275,7 +275,7 @@ const unsigned char asc16_font[] = {
 
 struct rtgui_font_bitmap asc16 =
 {
-	asc16_font, 		/* bmp */
+	(const rt_uint8_t*)asc16_font, 		/* bmp */
 	8, 					/* width */
 	16, 				/* height */
 	0, 					/* first char */
diff --git a/rtgui/common/filerw.c b/rtgui/common/filerw.c
index 1e03dda7647511f6c18d42ff395efec3fbc5f6e7..3ad9e8305489b694f84e2accfdc1891bd13ccfd0 100644
--- a/rtgui/common/filerw.c
+++ b/rtgui/common/filerw.c
@@ -190,12 +190,12 @@ struct rtgui_filerw_mem
 	/* inherit from rtgui_filerw */
 	struct rtgui_filerw parent;
 
-	rt_uint8_t *mem_base, *mem_position, *mem_end;
+	const rt_uint8_t *mem_base, *mem_position, *mem_end;
 };
 
 static int mem_seek(struct rtgui_filerw *context, rt_off_t offset, int whence)
 {
-	rt_uint8_t* newpos;
+	const rt_uint8_t* newpos;
 	struct rtgui_filerw_mem* mem = (struct rtgui_filerw_mem*)context;
 
 	RT_ASSERT(mem != RT_NULL);
@@ -250,7 +250,8 @@ static int mem_read(struct rtgui_filerw *context, void *ptr, rt_size_t size, rt_
 }
 
 static int mem_write(struct rtgui_filerw *context, const void *ptr, rt_size_t size, rt_size_t num)
-{
+{
+#if 0
 	struct rtgui_filerw_mem* mem = (struct rtgui_filerw_mem*)context;
 
 	if ((mem->mem_position + (num * size)) > mem->mem_end)
@@ -261,7 +262,10 @@ static int mem_write(struct rtgui_filerw *context, const void *ptr, rt_size_t si
 	rt_memcpy(mem->mem_position, ptr, num*size);
 	mem->mem_position += num*size;
 
-	return num;
+	return num;
+#else
+	return 0; /* not support memory write */
+#endif
 }
 
 static int mem_tell(struct rtgui_filerw* context)
@@ -291,7 +295,7 @@ static int mem_close(struct rtgui_filerw *context)
 	return -1;
 }
 
-rt_uint8_t* rtgui_filerw_mem_getdata(struct rtgui_filerw* context)
+const rt_uint8_t* rtgui_filerw_mem_getdata(struct rtgui_filerw* context)
 {
 	struct rtgui_filerw_mem* mem = (struct rtgui_filerw_mem*)context;
 
@@ -383,7 +387,7 @@ struct rtgui_filerw* rtgui_filerw_create_file(const char* filename, const char*
 }
 #endif
 
-struct rtgui_filerw* rtgui_filerw_create_mem(rt_uint8_t* mem, rt_size_t size)
+struct rtgui_filerw* rtgui_filerw_create_mem(const rt_uint8_t* mem, rt_size_t size)
 {
 	struct rtgui_filerw_mem* rw;
 	RT_ASSERT(mem != RT_NULL);
diff --git a/rtgui/common/image.c b/rtgui/common/image.c
index 64e2c992e2dfbda8b2daf153f6e4db3be2b06701..40c1363029acba8ffe55838768cbfae3a968160c 100644
--- a/rtgui/common/image.c
+++ b/rtgui/common/image.c
@@ -122,7 +122,7 @@ struct rtgui_image* rtgui_image_create_from_mem(const char* type, const rt_uint8
 	struct rtgui_image* image = RT_NULL;
 
 	/* create filerw context */
-	filerw = rtgui_filerw_create_mem((rt_uint8_t*)data, length);
+	filerw = rtgui_filerw_create_mem(data, length);
 	if (filerw == RT_NULL) return RT_NULL;
 
 	/* get image engine */
diff --git a/rtgui/include/rtgui/filerw.h b/rtgui/include/rtgui/filerw.h
index 0a9395fbb611ff67c3ec2e9297d7f7e25a7a36b1..b05ce3f8e98e4924450a15ff778371fe151b2320 100644
--- a/rtgui/include/rtgui/filerw.h
+++ b/rtgui/include/rtgui/filerw.h
@@ -32,7 +32,7 @@ struct rtgui_filerw
 typedef struct rtgui_filerw rtgui_filerw_t;
 
 struct rtgui_filerw* rtgui_filerw_create_file(const char* filename, const char* mode);
-struct rtgui_filerw* rtgui_filerw_create_mem(rt_uint8_t* mem, rt_size_t size);
+struct rtgui_filerw* rtgui_filerw_create_mem(const rt_uint8_t* mem, rt_size_t size);
 
 int rtgui_filerw_seek (struct rtgui_filerw* context, rt_off_t offset, int whence);
 int rtgui_filerw_read (struct rtgui_filerw* context, void* buffer, rt_size_t size, rt_size_t count);
@@ -42,6 +42,6 @@ int rtgui_filerw_eof  (struct rtgui_filerw* context);
 int rtgui_filerw_close(struct rtgui_filerw* context);
 
 /* get memory data from filerw memory object */
-rt_uint8_t* rtgui_filerw_mem_getdata(struct rtgui_filerw* context);
+const rt_uint8_t* rtgui_filerw_mem_getdata(struct rtgui_filerw* context);
 
 #endif
diff --git a/rtgui/widgets/window.c b/rtgui/widgets/window.c
index ae0c708b3cd15a316f7f6b3a3cd2f12b1fb620ac..b006b2e75dc1b19cb052de1ff62727b433bdaf43 100644
--- a/rtgui/widgets/window.c
+++ b/rtgui/widgets/window.c
@@ -430,6 +430,13 @@ rt_bool_t rtgui_win_event_handler(struct rtgui_widget* widget, struct rtgui_even
 #endif
 		break;
 
+    case RTGUI_EVENT_KBD:
+		if (RTGUI_CONTAINER(win)->focused != widget)
+		{
+			RTGUI_CONTAINER(win)->focused->event_handler(RTGUI_CONTAINER(win)->focused, event);
+		}
+        break;
+
 	default:
 		/* call parent event handler */
 		return rtgui_toplevel_event_handler(widget, event);