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-rw-r--r--src/class/cdc/cdc_device.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/class/cdc/cdc_device.h b/src/class/cdc/cdc_device.h
index 20e908451..db709b3bc 100644
--- a/src/class/cdc/cdc_device.h
+++ b/src/class/cdc/cdc_device.h
@@ -41,6 +41,12 @@
#define CFG_TUD_CDC_EP_BUFSIZE (TUD_OPT_HIGH_SPEED ? 512 : 64)
#endif
+// By default the TX fifo buffer is cleared on connect / bus reset.
+// Enable this to persist any data in the fifo instead.
+#ifndef CFG_TUD_CDC_PERSISTENT_TX_BUFF
+ #define CFG_TUD_CDC_PERSISTENT_TX_BUFF (0)
+#endif
+
#ifdef __cplusplus
extern "C" {
#endif