diff --git a/sw/airborne/arm7/test/uart_tunel.c b/sw/airborne/arm7/test/uart_tunel.c
new file mode 100644
index 0000000000..e70466bea3
--- /dev/null
+++ b/sw/airborne/arm7/test/uart_tunel.c
@@ -0,0 +1,26 @@
+
+#include "lpc2138.h"
+
+#define TXD0_PIN 0
+#define RXD0_PIN 1
+#define TXD1_PIN 8
+#define RXD1_PIN 9
+
+int main (int argc, char** argv) {
+  /* TXD0 and TXD1 output */
+  IODIR0 |= (1<<TXD0_PIN)|(1<<TXD1_PIN);
+  /* RXD0 and RXD1 input */
+  IODIR0 &= ~((1<<RXD0_PIN)|(1<<RXD1_PIN));
+
+  while(1) {
+    if (IOPIN0 & (1<<RXD0_PIN))
+      IOSET0 = (1<<TXD1_PIN);
+    else
+      IOCLR0 = (1<<TXD1_PIN);
+    if (IOPIN0 & (1<<RXD1_PIN))
+      IOSET0 = (1<<TXD0_PIN);
+    else
+      IOCLR0 = (1<<TXD0_PIN);
+  }
+  return 0;
+}