diff --git a/examples/ymodem/echo.c b/examples/ymodem/echo.c
index 5ffa5ff4178248f611d9c7f31835fdd148152155..5cb807f519aeb7b8eaf997b807eb3b05b325e053 100644
--- a/examples/ymodem/echo.c
+++ b/examples/ymodem/echo.c
@@ -25,8 +25,8 @@ rt_err_t rym_cat_to_dev(rt_device_t idev, rt_device_t odev)
         rt_kprintf("open output device error: 0x%x", -res);
         return res;
     }
-    res = rym_recv_on_device(&rctx, idev,
-            RT_NULL, _rym_echo_data, RT_NULL, 1000);
+    res = rym_recv_on_device(&rctx, idev, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
+                             RT_NULL, _rym_echo_data, RT_NULL, 1000);
     rt_device_close(_odev);
     rt_kprintf("leaving RYM mode with code %X\n", res);
     return res;
diff --git a/examples/ymodem/null.c b/examples/ymodem/null.c
index 5e3baa9870bc19b1ff51a2ddcf16d86b962ebb8f..c72ea064f8cc063d05cf2f095446f922fb26b517 100644
--- a/examples/ymodem/null.c
+++ b/examples/ymodem/null.c
@@ -20,8 +20,8 @@ rt_err_t rym_null(char *devname)
         return -1;
     }
 
-    return rym_recv_on_device(&rctx, dev,
-            RT_NULL, _rym_dummy_write, RT_NULL, 1000);
+    return rym_recv_on_device(&rctx, dev, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
+                              RT_NULL, _rym_dummy_write, RT_NULL, 1000);
 }
 FINSH_FUNCTION_EXPORT(rym_null, dump data to null);
 #endif
diff --git a/examples/ymodem/tofile.c b/examples/ymodem/tofile.c
index 2deef73c2cd45b6df6e42199c8528b0caa17892d..4a3705ede79961e0fab1c15752074c32b252dce2 100644
--- a/examples/ymodem/tofile.c
+++ b/examples/ymodem/tofile.c
@@ -21,7 +21,7 @@ static enum rym_code _rym_bg(
     struct custom_ctx *cctx = (struct custom_ctx*)ctx;
     cctx->fpath[0] = '/';
     /* the buf should be the file name */
-    strcpy(&(cctx->fpath[1]), buf);
+    strcpy(&(cctx->fpath[1]), (const char*)buf);
     cctx->fd = open(cctx->fpath, O_CREAT | O_WRONLY | O_TRUNC, 0);
     if (cctx->fd < 0)
     {
@@ -31,7 +31,7 @@ static enum rym_code _rym_bg(
         return RYM_CODE_CAN;
     }
 
-    cctx->flen = atoi(buf+strlen(buf)+1);
+    cctx->flen = atoi((const char*)buf+strlen((const char*)buf)+1);
     if (cctx->flen == 0)
         cctx->flen = -1;
     return RYM_CODE_ACK;
@@ -80,8 +80,8 @@ rt_err_t rym_write_to_file(rt_device_t idev)
 
     rt_kprintf("entering RYM mode\n");
 
-    res = rym_recv_on_device(&ctx->parent, idev,
-            _rym_bg, _rym_tof, _rym_end, 1000);
+    res = rym_recv_on_device(&ctx->parent, idev, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
+                             _rym_bg, _rym_tof, _rym_end, 1000);
 
     /* there is no Ymodem traffic on the line so print out info. */
     rt_kprintf("leaving RYM mode with code %d\n", res);