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-rw-r--r--src/core/ao_stdio.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/core/ao_stdio.c b/src/core/ao_stdio.c
index 2967e705..18fa913e 100644
--- a/src/core/ao_stdio.c
+++ b/src/core/ao_stdio.c
@@ -21,6 +21,12 @@
* Basic I/O functions to support SDCC stdio package
*/
+#ifdef SERIAL_STDIN_PORT
+#define USE_SERIAL_STDIN 1
+#else
+#define USE_SERIAL_STDIN 0
+#endif
+
#define AO_NUM_STDIOS (HAS_USB + PACKET_HAS_SLAVE + USE_SERIAL_STDIN)
__xdata struct ao_stdio ao_stdios[AO_NUM_STDIOS];