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-rw-r--r--examples/device/cdc_msc/src/tusb_config.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/examples/device/cdc_msc/src/tusb_config.h b/examples/device/cdc_msc/src/tusb_config.h
index 1370e61c5..e0099785b 100644
--- a/examples/device/cdc_msc/src/tusb_config.h
+++ b/examples/device/cdc_msc/src/tusb_config.h
@@ -65,7 +65,9 @@
#endif
// This example doesn't use an RTOS
+#ifndef CFG_TUSB_OS
#define CFG_TUSB_OS OPT_OS_NONE
+#endif
// CFG_TUSB_DEBUG is defined by compiler in DEBUG build
// #define CFG_TUSB_DEBUG 0