add more warning option, also fix -Wconversion with rp2040

-Wuninitialized, -Wunused,  -Wredundant-decls

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/device/cdc_msc/src/usb_descriptors.c b/examples/device/cdc_msc/src/usb_descriptors.c
index 09894cf1b..6b59ed50f 100644
--- a/examples/device/cdc_msc/src/usb_descriptors.c
+++ b/examples/device/cdc_msc/src/usb_descriptors.c
@@ -282,7 +282,7 @@ uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid)
   }
 
   // first byte is length (including header), second byte is string type
-  _desc_str[0] = (TUSB_DESC_STRING << 8 ) | (2*chr_count + 2);
+  _desc_str[0] = (uint16_t) ((TUSB_DESC_STRING << 8 ) | (2*chr_count + 2));
 
   return _desc_str;
 }