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diff --git a/io-module/at91gpio.h b/io-module/at91gpio.h
index c2f8a77..d6328f1 100644
--- a/io-module/at91gpio.h
+++ b/io-module/at91gpio.h
@@ -179,4 +179,23 @@
#define AT91_PIN_PE30 (0x80 + 30)
#define AT91_PIN_PE31 (0x80 + 31)
+// MTCDT-0.2 I2C I/O Port expanders
+#define PCA9557_0_IO0 (0xa0 + 0)
+#define PCA9557_0_IO1 (0xa0 + 1)
+#define PCA9557_0_IO2 (0xa0 + 2)
+#define PCA9557_0_IO3 (0xa0 + 3)
+#define PCA9557_0_IO4 (0xa0 + 4)
+#define PCA9557_0_IO5 (0xa0 + 5)
+#define PCA9557_0_IO6 (0xa0 + 6)
+#define PCA9557_0_IO7 (0xa0 + 7)
+
+#define PCA9557_1_IO0 (0xa8 + 0)
+#define PCA9557_1_IO1 (0xa8 + 1)
+#define PCA9557_1_IO2 (0xa8 + 2)
+#define PCA9557_1_IO3 (0xa8 + 3)
+#define PCA9557_1_IO4 (0xa8 + 4)
+#define PCA9557_1_IO5 (0xa8 + 5)
+#define PCA9557_1_IO6 (0xa8 + 6)
+#define PCA9557_1_IO7 (0xa8 + 7)
+
#endif
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