From 9c0ca88c2ef9702be6cfa13a3a1b085e733580af Mon Sep 17 00:00:00 2001
From: Frantisek Burian <BuFran@seznam.cz>
Date: Wed, 5 Feb 2014 23:48:33 +0100
Subject: [PATCH] [F0] Update CRCto be compatible wih RM0091 Rev. 5

---
 .../libopencm3/stm32/common/crc_common_all.h  | 20 +++++++++++++++++--
 include/libopencm3/stm32/f0/crc.h             | 17 ++++++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/include/libopencm3/stm32/common/crc_common_all.h b/include/libopencm3/stm32/common/crc_common_all.h
index 99af39a9..7dfeca52 100644
--- a/include/libopencm3/stm32/common/crc_common_all.h
+++ b/include/libopencm3/stm32/common/crc_common_all.h
@@ -37,7 +37,13 @@ specific memorymap.h header before including this header file.*/
 
 #include <libopencm3/cm3/common.h>
 
-/* --- CRC registers ------------------------------------------------------- */
+/*****************************************************************************/
+/* Module definitions                                                        */
+/*****************************************************************************/
+
+/*****************************************************************************/
+/* Register definitions                                                      */
+/*****************************************************************************/
 
 /* Data register (CRC_DR) */
 #define CRC_DR				MMIO32(CRC_BASE + 0x00)
@@ -48,6 +54,10 @@ specific memorymap.h header before including this header file.*/
 /* Control register (CRC_CR) */
 #define CRC_CR				MMIO32(CRC_BASE + 0x08)
 
+/*****************************************************************************/
+/* Register values                                                           */
+/*****************************************************************************/
+
 /* --- CRC_DR values ------------------------------------------------------- */
 
 /* Bits [31:0]: Data register */
@@ -65,7 +75,13 @@ specific memorymap.h header before including this header file.*/
 /* RESET bit */
 #define CRC_CR_RESET			(1 << 0)
 
-/* --- CRC function prototypes --------------------------------------------- */
+/*****************************************************************************/
+/* API definitions                                                           */
+/*****************************************************************************/
+
+/*****************************************************************************/
+/* API Functions                                                             */
+/*****************************************************************************/
 
 BEGIN_DECLS
 
diff --git a/include/libopencm3/stm32/f0/crc.h b/include/libopencm3/stm32/f0/crc.h
index 4c1ee9bb..efa1380c 100644
--- a/include/libopencm3/stm32/f0/crc.h
+++ b/include/libopencm3/stm32/f0/crc.h
@@ -45,11 +45,18 @@
 /* Register definitions                                                      */
 /*****************************************************************************/
 
+/* Initial CRC Value */
+#define CRC_INIT			MMIO32(CRC_BASE + 0x10)
+
+/* CRC Polynomial */
+#define CRC_POL				MMIO32(CRC_BASE + 0x14)
+
 /*****************************************************************************/
 /* Register values                                                           */
 /*****************************************************************************/
 
 #define CRC_CR_REV_OUT			(1 << 7)
+
 #define CRC_CR_REV_IN_SHIFT		5
 #define CRC_CR_REV_IN			(3 << CRC_CR_REV_IN_SHIFT)
 #define CRC_CR_REV_IN_NONE		(0 << CRC_CR_REV_IN_SHIFT)
@@ -57,6 +64,16 @@
 #define CRC_CR_REV_IN_HALF		(2 << CRC_CR_REV_IN_SHIFT)
 #define CRC_CR_REV_IN_WORD		(3 << CRC_CR_REV_IN_SHIFT)
 
+#define CRC_CR_POLYSIZE_SHIFT		3
+#define CRC_CR_POLYSIZE			(3 << CRC_CR_POLYSIZE_SHIFT)
+#define CRC_CR_POLYSIZE_32BIT		(0 << CRC_CR_POLYSIZE_SHIFT)
+#define CRC_CR_POLYSIZE_16BIT		(1 << CRC_CR_POLYSIZE_SHIFT)
+#define CRC_CR_POLYSIZE_8BIT		(2 << CRC_CR_POLYSIZE_SHIFT)
+#define CRC_CR_POLYSIZE_7BIT		(3 << CRC_CR_POLYSIZE_SHIFT)
+
+/* Default polynomial */
+#define CRC_POL_DEFAULT			0x04C11DB7
+
 /*****************************************************************************/
 /* API definitions                                                           */
 /*****************************************************************************/