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/** @addtogroup crc_defines */
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/* THIS FILE SHOULD NOT BE INCLUDED DIRECTLY, BUT ONLY VIA SPI.H */
#ifndef LIBOPENCM3_CRC_COMMON_ALL_H
#define LIBOPENCM3_CRC_COMMON_ALL_H
#include <libopencm3/cm3/common.h>
/* --- CRC registers ------------------------------------------------------- */
/* Data register (CRC_DR) */
#define CRC_DR MMIO32(CRC_BASE + 0x00)
/* Independent data register (CRC_IDR) */
#define CRC_IDR MMIO32(CRC_BASE + 0x04)
/* Control register (CRC_CR) */
#define CRC_CR MMIO32(CRC_BASE + 0x08)
/* --- CRC_DR values ------------------------------------------------------- */
/* Bits [31:0]: Data register */
/* --- CRC_IDR values ------------------------------------------------------ */
/* Bits [31:8]: Reserved */
/* Bits [7:0]: General-purpose 8-bit data register bits */
/* --- CRC_CR values ------------------------------------------------------- */
/* Bits [31:1]: Reserved */
/* RESET bit */
#define CRC_CR_RESET (1 << 0)
/* --- CRC function prototypes --------------------------------------------- */
BEGIN_DECLS
/* TODO */
/**
* Reset the CRC calculator to initial values.
*/
void crc_reset(void);
/**
* Add a word to the crc calculator and return the result.
* @param data new word to add to the crc calculator
* @return final crc calculator value
*/
u32 crc_calculate(u32 data);
/**
* Add a block of data to the CRC calculator and return the final result
* @param datap pointer to the start of a block of 32bit data words
* @param size length of data, in 32bit increments
* @return final CRC calculator value
*/
u32 crc_calculate_block(u32 *datap, int size);
END_DECLS
#endif
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