diff --git a/src/irq.c b/src/irq.c
new file mode 100644
index 0000000..b4f3ee8
--- /dev/null
+++ b/src/irq.c
@@ -0,0 +1,15 @@
+#include <arm/NXP/LPC17xx/LPC17xx.h>
+#include "bits.h"
+#include "config.h"
+#include "sdnative.h"
+#include "uart.h"
+
+void EINT3_IRQHandler(void) {
+  NVIC_ClearPendingIRQ(EINT3_IRQn);
+  if(SD_CHANGE_DETECT) {
+    SD_CHANGE_CLR();
+    sdn_changed();
+  }
+}
+
+