diff --git a/boards/ngx/board_ngx4330.h b/boards/ngx/board_ngx4330.h
index 3ac30ecb..7d913231 100644
--- a/boards/ngx/board_ngx4330.h
+++ b/boards/ngx/board_ngx4330.h
@@ -57,6 +57,7 @@
 #endif
 
 #define CFG_PRINTF_TARGET       PRINTF_TARGET_UART
+//#define CFG_PRINTF_TARGET       PRINTF_TARGET_SWO
 
 #ifdef __cplusplus
  }
diff --git a/demos/host/host_freertos/host_freertos.uvopt b/demos/host/host_freertos/host_freertos.uvopt
index ea04b496..c72b1b5f 100644
--- a/demos/host/host_freertos/host_freertos.uvopt
+++ b/demos/host/host_freertos/host_freertos.uvopt
@@ -706,7 +706,7 @@
       <Focus>0</Focus>
       <ColumnNumber>9</ColumnNumber>
       <tvExpOptDlg>0</tvExpOptDlg>
-      <TopLine>5</TopLine>
+      <TopLine>6</TopLine>
       <CurrentLine>11</CurrentLine>
       <bDave2>0</bDave2>
       <PathWithFileName>..\src\main.c</PathWithFileName>
@@ -1168,10 +1168,10 @@
       <FileType>1</FileType>
       <tvExp>0</tvExp>
       <Focus>0</Focus>
-      <ColumnNumber>0</ColumnNumber>
+      <ColumnNumber>19</ColumnNumber>
       <tvExpOptDlg>0</tvExpOptDlg>
-      <TopLine>41</TopLine>
-      <CurrentLine>49</CurrentLine>
+      <TopLine>42</TopLine>
+      <CurrentLine>51</CurrentLine>
       <bDave2>0</bDave2>
       <PathWithFileName>..\..\..\vendor\freertos\freertoslpc\FreeRTOSCommonHooks.c</PathWithFileName>
       <FilenameWithoutPath>FreeRTOSCommonHooks.c</FilenameWithoutPath>
diff --git a/demos/host/host_os_none/host_os_none.uvopt b/demos/host/host_os_none/host_os_none.uvopt
index 5b7d1826..fb45378e 100644
--- a/demos/host/host_os_none/host_os_none.uvopt
+++ b/demos/host/host_os_none/host_os_none.uvopt
@@ -918,7 +918,7 @@
       <Focus>0</Focus>
       <ColumnNumber>1</ColumnNumber>
       <tvExpOptDlg>0</tvExpOptDlg>
-      <TopLine>106</TopLine>
+      <TopLine>107</TopLine>
       <CurrentLine>114</CurrentLine>
       <bDave2>0</bDave2>
       <PathWithFileName>..\src\main.c</PathWithFileName>
@@ -998,7 +998,7 @@
       <Focus>0</Focus>
       <ColumnNumber>0</ColumnNumber>
       <tvExpOptDlg>0</tvExpOptDlg>
-      <TopLine>139</TopLine>
+      <TopLine>140</TopLine>
       <CurrentLine>149</CurrentLine>
       <bDave2>0</bDave2>
       <PathWithFileName>..\src\msc_app.c</PathWithFileName>
@@ -1014,7 +1014,7 @@
       <Focus>0</Focus>
       <ColumnNumber>40</ColumnNumber>
       <tvExpOptDlg>0</tvExpOptDlg>
-      <TopLine>228</TopLine>
+      <TopLine>229</TopLine>
       <CurrentLine>238</CurrentLine>
       <bDave2>0</bDave2>
       <PathWithFileName>..\src\cli.c</PathWithFileName>
@@ -1462,7 +1462,7 @@
       <Focus>0</Focus>
       <ColumnNumber>43</ColumnNumber>
       <tvExpOptDlg>0</tvExpOptDlg>
-      <TopLine>5</TopLine>
+      <TopLine>6</TopLine>
       <CurrentLine>15</CurrentLine>
       <bDave2>0</bDave2>
       <PathWithFileName>..\..\..\vendor\fatfs\diskio.c</PathWithFileName>
diff --git a/demos/host/src/keyboard_app.c b/demos/host/src/keyboard_app.c
index c004059e..07e65ce7 100644
--- a/demos/host/src/keyboard_app.c
+++ b/demos/host/src/keyboard_app.c
@@ -115,12 +115,13 @@ void keyboard_app_init(void)
 //------------- main task -------------//
 OSAL_TASK_FUNCTION( keyboard_app_task ) (void* p_task_para)
 {
-  tusb_error_t error;
   hid_keyboard_report_t kbd_report;
+  tusb_error_t error;
 
   OSAL_TASK_LOOP_BEGIN
 
   osal_queue_receive(queue_kbd_hdl, &kbd_report, OSAL_TIMEOUT_WAIT_FOREVER, &error);
+  (void) error; // suppress compiler warning
 
   process_kbd_report(&kbd_report);
 
diff --git a/demos/host/src/tusb_config.h b/demos/host/src/tusb_config.h
index 82e8124a..13362054 100644
--- a/demos/host/src/tusb_config.h
+++ b/demos/host/src/tusb_config.h
@@ -102,7 +102,7 @@
 #elif defined __ICCARM__ // compiled with IAR
 
   #if  (TUSB_CFG_MCU == MCU_LPC43XX)
-    #define TUSB_CFG_ATTR_USBRAM _Pragma("location=\".ahb_sram2\"") // some mcu like 4330 ahb_sram1 is used for heap/stack in IAR
+    #define TUSB_CFG_ATTR_USBRAM _Pragma("location=\".ahb_sram1\"")
   #elif (TUSB_CFG_MCU == MCU_LPC175X_6X)
     #define TUSB_CFG_ATTR_USBRAM
   #endif