Diff: targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_crc.c

Revision:

50:a417edff4437

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_crc.c	Fri Jan 15 07:45:16 2016 +0000
@@ -0,0 +1,122 @@
+/***************************************************************************//**
+ * @file
+ * @brief Cyclic Redundancy Check (CRC) API.
+ * @version 4.2.1
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
+ * obligation to support this Software. Silicon Labs is providing the
+ * Software "AS IS", with no express or implied warranties of any kind,
+ * including, but not limited to, any implied warranties of merchantability
+ * or fitness for any particular purpose or warranties against infringement
+ * of any proprietary rights of a third party.
+ *
+ * Silicon Labs will not be liable for any consequential, incidental, or
+ * special damages, or any other relief, or for any claim by any third party,
+ * arising from your use of this Software.
+ *
+ ******************************************************************************/
+
+#include "em_crc.h"
+#include "em_assert.h"
+
+#if defined(CRC_COUNT) && (CRC_COUNT > 0)
+
+/***************************************************************************//**
+ * @addtogroup EM_Library
+ * @{
+ ******************************************************************************/
+
+/***************************************************************************//**
+ * @addtogroup CRC
+ * @{
+ ******************************************************************************/
+
+/*******************************************************************************
+ ********************************   ENUMS   ************************************
+ ******************************************************************************/
+
+
+/*******************************************************************************
+ *******************************   STRUCTS   ***********************************
+ ******************************************************************************/
+
+
+/*******************************************************************************
+ ***************************   GLOBAL FUNCTIONS   ******************************
+ ******************************************************************************/
+
+/***************************************************************************//**
+ * @brief
+ *   Initialize the Cyclic Redundancy Check (CRC) module of EFR.
+ *
+ * @details
+ *   Use this function to configure the main operational parameters of the CRC
+ *   such as CRC bytes, number of valid input bits, input/output bit- and bit
+ *   order reversing.
+ *   Refer to EFR Reference Manual Chapter 14 and the configuration structure
+ *   CRC_Init_TypeDef for more details.
+ *
+ * @note
+ *   Internal notes:
+ *   - Initialize the CRC in the Init() function or let users use the separate
+ *   command function?
+ *
+ * @param[in] init
+ *   Pointer to initialization structure used to configure the CRC.
+ ******************************************************************************/
+void CRC_Init(CRC_Init_TypeDef const *init)
+{
+  /* Sanity check of bitsPerWord. */
+  EFM_ASSERT(init->bitsPerWord < 16U);
+
+  /* Set CRC control configuration parameters such as CRC width, byte and bit
+   * bit order, the number of bits per word, inverting input/output, etc. */
+  CRC->CTRL = (uint32_t)init->crcWidth
+              | (uint32_t)init->byteReverse
+              | (uint32_t)init->inputBitOrder
+              | (uint32_t)init->bitReverse
+              | ((uint32_t)init->bitsPerWord >> _CRC_CTRL_BITSPERWORD_SHIFT)
+              | ((uint32_t)init->inputPadding >> _CRC_CTRL_PADCRCINPUT_SHIFT)
+              | ((uint32_t)init->invInput >> _CRC_CTRL_INPUTINV_SHIFT)
+              | ((uint32_t)init->invOutput >> _CRC_CTRL_OUTPUTINV_SHIFT);
+
+  /* Set CRC polynomial value. */
+  CRC->POLY = init->crcPoly;
+
+  /* Load CRC initialization value to CRC_INIT. Please note, that the
+   * initialization is not performed here! */
+  CRC->INIT = init->initValue;
+}
+
+
+/***************************************************************************//**
+ * @brief
+ *   Reset CRC registers to the hardware reset state.
+ ******************************************************************************/
+void CRC_Reset(void)
+{
+  /* Reset CRC registers to their default value. */
+  CRC->CTRL = _CRC_CTRL_RESETVALUE;
+  CRC->POLY = _CRC_POLY_RESETVALUE;
+  CRC->INIT = _CRC_INIT_RESETVALUE;
+}
+
+
+/** @} (end addtogroup CRC) */
+/** @} (end addtogroup EM_Library) */
+
+#endif /* defined(CRC_COUNT) && (CRC_COUNT > 0) */