diff --git a/drivers/afio.c b/drivers/afio.c
new file mode 100644
index 0000000..688bc20
--- /dev/null
+++ b/drivers/afio.c
@@ -0,0 +1,63 @@
+/** @file afio.c
+ * Module handling Alternate Functions for Inputs/Outputs
+ *
+ * The module provides functions to remap ios to diverse peripherals
+ */
+
+//--includes--------------------------------------------------------------------
+
+#include "afio.h"
+#include "afio_regs.h"
+
+#include "rcc.h"
+
+
+//--local definitions-----------------------------------------------------------
+
+//--local variables-------------------------------------------------------------
+
+static volatile struct AFIO* regs = (struct AFIO*)AFIO_BASE_ADDRESS;
+
+
+//--public functions------------------------------------------------------------
+
+void afio_map_exti(enum ExtiLine line_mask, enum GpioPort port)
+{
+	//ensure afio peripheral is enabled
+	rcc_enable(RCC_AHB_NONE, RCC_APB1_NONE, RCC_APB2_AFIO);
+
+	for (uint8_t i = 0; i < 4; ++i) {
+		if (line_mask & (0x1 << i)) {
+			regs->EXTICR1.word &= ~(0xF << (4 * i));
+			regs->EXTICR1.word |= (port << (4 * i));
+		}
+	}
+
+	line_mask = line_mask >> 4;
+	for (uint8_t i = 0; i < 4; ++i) {
+		if (line_mask & (0x1 << i)) {
+			regs->EXTICR2.word &= ~(0xF << (4 * i));
+			regs->EXTICR2.word |= (port << (4 * i));
+		}
+	}
+
+	line_mask = line_mask >> 4;
+	for (uint8_t i = 0; i < 4; ++i) {
+		if (line_mask & (0x1 << i)) {
+			regs->EXTICR3.word &= ~(0xF << (4 * i));
+			regs->EXTICR3.word |= (port << (4 * i));
+		}
+	}
+
+	line_mask = line_mask >> 4;
+	for (uint8_t i = 0; i < 4; ++i) {
+		if (line_mask & (0x1 << i)) {
+			regs->EXTICR4.word &= ~(0xF << (4 * i));
+			regs->EXTICR4.word |= (port << (4 * i));
+		}
+	}
+}
+
+
+//--local functions-------------------------------------------------------------
+
diff --git a/drivers/afio.h b/drivers/afio.h
new file mode 100644
index 0000000..961390c
--- /dev/null
+++ b/drivers/afio.h
@@ -0,0 +1,26 @@
+/** @file afio.h
+ * Module handling Alternate Functions for Inputs/Outputs
+ *
+ * The module provides functions to remap ios to diverse peripherals
+ */
+
+#ifndef _AFIO_H_
+#define _AFIO_H_
+
+//--includes--------------------------------------------------------------------
+
+#include "stdint.h"
+#include "stdbool.h"
+
+#include "exti.h"
+
+
+//--type definitions------------------------------------------------------------
+
+//--functions-------------------------------------------------------------------
+
+void afio_map_exti(enum ExtiLine line_mask, enum GpioPort port);
+
+
+#endif //_AFIO_H_
+