From: bernie <bernie@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Wed, 13 Sep 2006 18:29:54 +0000 (+0000)
Subject: e2addr(): New macro.
X-Git-Tag: 1.0.0~552
X-Git-Url: https://codewiz.org/gitweb?a=commitdiff_plain;h=0ec7a71ae68cbdc79718c5c165a615d943e03293;p=bertos.git

e2addr(): New macro.


git-svn-id: https://src.develer.com/svnoss/bertos/trunk@689 38d2e660-2303-0410-9eaa-f027e97ec537
---

diff --git a/drv/eeprom.h b/drv/eeprom.h
index c41519d7..7a80f177 100755
--- a/drv/eeprom.h
+++ b/drv/eeprom.h
@@ -15,6 +15,9 @@
 
 /*#*
  *#* $Log$
+ *#* Revision 1.10  2006/09/13 18:29:54  bernie
+ *#* e2addr(): New macro.
+ *#*
  *#* Revision 1.9  2006/07/19 12:56:25  bernie
  *#* Convert to new Doxygen style.
  *#*
@@ -70,6 +73,17 @@
 /// Type for EEPROM addresses
 typedef uint16_t e2addr_t;
 
+/**
+ * Macro for E2Layout offset calculation
+ *
+ * \note We can't just use offsetof() here because we could use
+ *       non-constant expressions to access array elements.
+ *
+ * \note E2Layout is a structure that must be defined in user files.
+ */
+#define e2addr(x) ((e2addr_t)&(((struct E2Layout *)0)->x))
+
+
 bool eeprom_write(e2addr_t addr, const void *buf, size_t count);
 bool eeprom_read(e2addr_t addr, void *buf, size_t count);
 bool eeprom_write_char(e2addr_t addr, char c);