From 3fb88e3c0237379e32bd6d1d27465d5324726684 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <kwojtus@protonmail.com>
Date: Tue, 31 Dec 2019 20:21:06 +0100
Subject: make global.h more readable

---
 global.h | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

(limited to 'global.h')

diff --git a/global.h b/global.h
index 6fc19ed..202ca85 100644
--- a/global.h
+++ b/global.h
@@ -4,16 +4,23 @@
 // board type, raspi2
 #define RASPI 2
 
+// conditionally #define PERIF_BASE
 #if RASPI == 4
+
 #define PERIF_BASE 0xFE000000
-#else
-#if RASPI == 3 || RASPI == 2
+
+#elif RASPI == 3 || RASPI == 2
+
 #define PERIF_BASE 0x3F000000
-#else
+
+#else // if RASPI == 1
+
 #define PERIF_BASE 0x20000000
-#endif // RASPI == 3 || RASPI == 2
-#endif // RASPI == 4
 
+#endif
+
+// GPIO_BASE is #define'd in terms of PERIF_BASE
+// (as in sane kernels - like linux, not like in wiki.osdev codes...)
 #define GPIO_BASE (PERIF_BASE + 0x200000)
 
 #endif // GLOBAL_H
-- 
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