diff --git a/global.h b/global.h
index 07fd195..7511165 100644
--- a/global.h
+++ b/global.h
@@ -35,6 +35,10 @@
  */
 /** get GPIO based on GPIO identifier */
 #define GPIO(x) CAT2(GPIO,x)
+/** get GPIO based on identifier */
+#define GPIO_(x) CAT2(GPIO_,x)
+/** get GPIO based on bank identifier */
+#define GPIO_BANK_(x) CAT2(GPIO_BANK_,x)
 /** get RCC for GPIO based on GPIO identifier */
 #define RCC_GPIO(x) CAT2(RCC_GPIO,x)
 /** get TIM based on TIM identifier */