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-rw-r--r--cores/arduino/HardwareSerial.h4
-rw-r--r--cores/arduino/USBAPI.h2
2 files changed, 3 insertions, 3 deletions
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index 1beafc5..8a5bf95 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -40,14 +40,14 @@
// often work, but occasionally a race condition can occur that makes
// Serial behave erratically. See https://github.com/arduino/Arduino/issues/2405
#if !defined(SERIAL_TX_BUFFER_SIZE)
-#if (RAMEND < 1000)
+#if ((RAMEND - RAMSTART) < 1023)
#define SERIAL_TX_BUFFER_SIZE 16
#else
#define SERIAL_TX_BUFFER_SIZE 64
#endif
#endif
#if !defined(SERIAL_RX_BUFFER_SIZE)
-#if (RAMEND < 1000)
+#if ((RAMEND - RAMSTART) < 1023)
#define SERIAL_RX_BUFFER_SIZE 16
#else
#define SERIAL_RX_BUFFER_SIZE 64
diff --git a/cores/arduino/USBAPI.h b/cores/arduino/USBAPI.h
index 4072772..f22ab6a 100644
--- a/cores/arduino/USBAPI.h
+++ b/cores/arduino/USBAPI.h
@@ -75,7 +75,7 @@ extern USBDevice_ USBDevice;
struct ring_buffer;
#ifndef SERIAL_BUFFER_SIZE
-#if (RAMEND < 1000)
+#if ((RAMEND - RAMSTART) < 1023)
#define SERIAL_BUFFER_SIZE 16
#else
#define SERIAL_BUFFER_SIZE 64