eeprom.cpp
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1 /*
2  * Copyright (c) 2017, James Jackson and Trey Henrichsen
3  *
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * * Redistributions of source code must retain the above copyright notice, this
10  * list of conditions and the following disclaimer.
11  *
12  * * Redistributions in binary form must reproduce the above copyright notice,
13  * this list of conditions and the following disclaimer in the documentation
14  * and/or other materials provided with the distribution.
15  *
16  * * Neither the name of the copyright holder nor the names of its
17  * contributors may be used to endorse or promote products derived from
18  * this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
23  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
26  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
27  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include "string.h"
33 #include "system.h"
34 
35 #include "eeprom.h"
36 
38 {
39  return;//nothing needed
40 }
41 //Reads the data stored in flash sector 11
42 bool eeprom_read(void * dest, uint8_t len)
43 {
44  memcpy(dest, FLASH_SECTOR11_START, len);
45  return true;
46 }
47 //writes to the 11th sector, which is used for persistant storage
48 bool eeprom_write(const void* src, uint8_t len)
49 {
50  return flash_write(FLASH_SECTOR11_START, src,len);
51 }
52 //Reads from the specified location. Note that there is no error checking
53 bool flash_read(void* flash_loc,void* dest, uint8_t len)
54 {
55  memcpy(dest, flash_loc, len);
56  return true;
57 }
58 //Erases the 11th sector, which is used for persistent storage
60 {
61  FLASH_Unlock();
63  return true;
64 }
65 //writes data to the given location. Note that there is no error checking
66 bool flash_write(void const* flash_loc, void const* data, uint8_t len)
67 {
68  flash_erase();
69  FLASH->CR|=FLASH_CR_PG;
70  uint32_t const* dataPtr = static_cast<uint32_t const*>(data);
71  uint32_t flash_address= reinterpret_cast<uint32_t>(flash_loc);
72  for (uint32_t i=0;i<len;i+=4)
73  FLASH_ProgramWord(flash_address+i,*(dataPtr++));
74  return true;
75 }
bool flash_write(void const *flash_loc, void const *data, uint8_t len)
Definition: eeprom.cpp:66
void eeprom_init()
Definition: eeprom.cpp:37
void FLASH_Unlock(void)
Unlocks the FLASH control register access.
bool flash_read(void *flash_loc, void *dest, uint8_t len)
Definition: eeprom.cpp:53
#define VoltageRange_3
#define FLASH_CR_PG
Definition: stm32f4xx.h:4570
bool flash_erase()
Definition: eeprom.cpp:59
bool eeprom_write(const void *src, uint8_t len)
Definition: eeprom.cpp:48
#define FLASH
Definition: stm32f4xx.h:2123
bool eeprom_read(void *dest, uint8_t len)
Definition: eeprom.cpp:42
#define FLASH_SECTOR11_START
Definition: eeprom.h:38
#define FLASH_Sector_11
FLASH_Status FLASH_ProgramWord(uint32_t Address, uint32_t Data)
Programs a word at a specified address.
FLASH_Status FLASH_EraseSector(uint32_t FLASH_Sector, uint8_t VoltageRange)
Erases a specified FLASH Sector.


rosflight_firmware
Author(s): Daniel Koch , James Jackson
autogenerated on Thu Oct 24 2019 03:17:18