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#ifndef _STM32F4_VROM_H_
#define _STM32F4_VROM_H_
/*!
* STM32F4 Virtual EEPROM driver
*
* This module implements a crude virtual EEPROM device stored in on-board
* flash. The STM32F405 has 4 16kB flash sectors starting at address
* 0x80000000, followed by a 64kB sector, then 128kB sectors.
*
* The Cortex M4 core maps these all to address 0x00000000 when booting
* from normal flash, so the first sector is reserved for interrupt
* vectors.
*
* Everything else however is free game, and so we use these smaller
* sectors to store our configuration.
*
* Author Stuart Longland <[email protected]>
* Copyright (C) 2015 FreeDV project.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 2.1,
* as published by the Free Software Foundation. This program 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 General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see
* <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <errno.h>
/*!
* Read data from a virtual EEPROM.
* @param rom ROM ID to start reading.
* @param offset Address offset into ROM to start reading.
* @param size Number of bytes to read from ROM.
* @param out Buffer to write ROM content to.
* @returns Number of bytes read from ROM.
* @retval -ENXIO No valid data found for address.
* @retval -ESPIPE Offset past end of ROM.
*/
int vrom_read(uint8_t rom, uint16_t offset, uint16_t size, void* out);
/*!
* Write data to a virtual EEPROM.
* @param rom ROM ID to start writing.
* @param offset Address offset into ROM to start writing.
* @param size Number of bytes to write to ROM.
* @param in Buffer to write ROM content from.
* @returns Number of bytes written to ROM.
* @retval -EIO Programming failed
* @retval -ENOSPC No free blocks available
*/
int vrom_write(uint8_t rom, uint16_t offset, uint16_t size,
const void* in);
/*!
* Erase a virtual EEPROM.
* @param rom ROM ID to erase.
* @returns Number of bytes written to ROM.
* @retval -EIO Programming failed
* @retval -ENOSPC No free blocks available
*/
int vrom_erase(uint8_t rom);
#endif
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