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-rw-r--r--cores/arduino/HardwareSerial.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index 7dc2aa9..7f4f162 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -34,12 +34,17 @@
// location from which to read.
// NOTE: a "power of 2" buffer size is reccomended to dramatically
// optimize all the modulo operations for ring buffers.
-#if !(defined(SERIAL_TX_BUFFER_SIZE) && defined(SERIAL_RX_BUFFER_SIZE))
+#if !defined(SERIAL_TX_BUFFER_SIZE)
#if (RAMEND < 1000)
#define SERIAL_TX_BUFFER_SIZE 16
-#define SERIAL_RX_BUFFER_SIZE 16
#else
#define SERIAL_TX_BUFFER_SIZE 64
+#endif
+#endif
+#if !defined(SERIAL_RX_BUFFER_SIZE)
+#if (RAMEND < 1000)
+#define SERIAL_RX_BUFFER_SIZE 16
+#else
#define SERIAL_RX_BUFFER_SIZE 64
#endif
#endif