Richard Thompson / FlashM25PSpi

Flash handler for M25P* chips with no Device ID.

Dependencies:   RTOS_SPI_Clean

Fork of flash25spi by Klaus Steinhammer

flash25spi.h@3:318fabd6708c, 2014-04-25 (annotated)

Committer:
Tomo2k
Date:
Fri Apr 25 12:25:08 2014 +0000
Revision:
3:318fabd6708c
Parent:
1:aa6409c599cb
Child:
4:af870c53c0e9
Now supports two M25P* flash chips that do not have Device ID info

Who changed what in which revision?

UserRevisionLine numberNew contents of line
stonie 0:d07f90d3c670 1 /* This library is based on the Ser25lcxxx library by Hendrik Lipka
stonie 0:d07f90d3c670 2 * It was adapted to flash memory chips on 19.2.2011 by Klaus Steinhammer
Tomo2k 3:318fabd6708c 3 *
Tomo2k 3:318fabd6708c 4 * It was further adapted to M25P* SPI Flash memory chips that do not
Tomo2k 3:318fabd6708c 5 * support the "RDID" device ID instructions on 25.03.2014 by Richard Thompson
Tomo2k 3:318fabd6708c 6 *
Tomo2k 3:318fabd6708c 7 * The BSD license also applies to this code - have fun.
stonie 0:d07f90d3c670 8 */
stonie 0:d07f90d3c670 9
stonie 0:d07f90d3c670 10 /*
stonie 0:d07f90d3c670 11 * Ser25lcxxx library
stonie 0:d07f90d3c670 12 * Copyright (c) 2010 Hendrik Lipka
Tomo2k 3:318fabd6708c 13 *
stonie 0:d07f90d3c670 14 * Permission is hereby granted, free of charge, to any person obtaining a copy
stonie 0:d07f90d3c670 15 * of this software and associated documentation files (the "Software"), to deal
stonie 0:d07f90d3c670 16 * in the Software without restriction, including without limitation the rights
stonie 0:d07f90d3c670 17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
stonie 0:d07f90d3c670 18 * copies of the Software, and to permit persons to whom the Software is
stonie 0:d07f90d3c670 19 * furnished to do so, subject to the following conditions:
Tomo2k 3:318fabd6708c 20 *
stonie 0:d07f90d3c670 21 * The above copyright notice and this permission notice shall be included in
stonie 0:d07f90d3c670 22 * all copies or substantial portions of the Software.
Tomo2k 3:318fabd6708c 23 *
stonie 0:d07f90d3c670 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
stonie 0:d07f90d3c670 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
stonie 0:d07f90d3c670 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
stonie 0:d07f90d3c670 27 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
stonie 0:d07f90d3c670 28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
stonie 0:d07f90d3c670 29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
stonie 0:d07f90d3c670 30 * THE SOFTWARE.
stonie 0:d07f90d3c670 31 */
stonie 0:d07f90d3c670 32
Tomo2k 3:318fabd6708c 33 #pragma once
Tomo2k 3:318fabd6708c 34 #include "mbed.h"
stonie 0:d07f90d3c670 35
Tomo2k 3:318fabd6708c 36 class CDI;
stonie 0:d07f90d3c670 37
stonie 0:d07f90d3c670 38 /**
Tomo2k 3:318fabd6708c 39 A class to read and write M25P* serial SPI flash devices.
stonie 0:d07f90d3c670 40 */
Tomo2k 3:318fabd6708c 41 class FlashM25PSpi
stonie 0:d07f90d3c670 42 {
Tomo2k 3:318fabd6708c 43 public:
Tomo2k 3:318fabd6708c 44 /**
Tomo2k 3:318fabd6708c 45 Create the handler class. it tries to autodetect your device. If your device is not recognized, add the devices parameters
Tomo2k 3:318fabd6708c 46 to the device data structure at the library sources.
Tomo2k 3:318fabd6708c 47 @param spi the SPI port where the flash is connected. Must be set to format(8,3), and with a speed matching the one of your device
Tomo2k 3:318fabd6708c 48 @param enable the pin name for the port where /CS is connected
Tomo2k 3:318fabd6708c 49 */
Tomo2k 3:318fabd6708c 50 FlashM25PSpi(SPI *spi, PinName enable, CDI *cdi = 0);
Tomo2k 3:318fabd6708c 51
Tomo2k 3:318fabd6708c 52 /**
Tomo2k 3:318fabd6708c 53 Destroy the handler and powers down the flash chip
Tomo2k 3:318fabd6708c 54 */
Tomo2k 3:318fabd6708c 55 ~FlashM25PSpi();
Tomo2k 3:318fabd6708c 56
Tomo2k 3:318fabd6708c 57 /**
Tomo2k 3:318fabd6708c 58 Read a part of the flash memory into destination.
Tomo2k 3:318fabd6708c 59 The buffer must be pre-allocated by the caller
Tomo2k 3:318fabd6708c 60 @param startAdr Flash address to start reading from. Doesn't need to match a page boundary
Tomo2k 3:318fabd6708c 61 @param destination Destination buffer
Tomo2k 3:318fabd6708c 62 @param len Number of bytes to read (must not exceed the end of memory)
Tomo2k 3:318fabd6708c 63 @return true if succeeded
Tomo2k 3:318fabd6708c 64 */
Tomo2k 3:318fabd6708c 65 bool read(uint32_t startAddr, void* destination, size_t len);
stonie 0:d07f90d3c670 66
Tomo2k 3:318fabd6708c 67 /**
Tomo2k 3:318fabd6708c 68 Write the give buffer into the memory.
Tomo2k 3:318fabd6708c 69 This function handles dividing the write into pages until the physical write has finished.
Tomo2k 3:318fabd6708c 70 @note The flash must be erased before starting a write cycle.
Tomo2k 3:318fabd6708c 71 @param startAdr Address to start writing. Doesn't need to match a page boundary
Tomo2k 3:318fabd6708c 72 @param data Source data buffer
Tomo2k 3:318fabd6708c 73 @param len the number of bytes to write (must not exceed the end of memory)
Tomo2k 3:318fabd6708c 74 @return false if the adresses are out of range
Tomo2k 3:318fabd6708c 75 */
Tomo2k 3:318fabd6708c 76 bool write(uint32_t startAddr, const void* data, size_t len);
Tomo2k 3:318fabd6708c 77
Tomo2k 3:318fabd6708c 78 /**
Tomo2k 3:318fabd6708c 79 Erases the sector containing the given address to 0xFF - this erases several pages.
Tomo2k 3:318fabd6708c 80 Refer to the IC datasheet or Size() methods for memory organisation.
Tomo2k 3:318fabd6708c 81 @param addr Any address within the sector to be cleared
Tomo2k 3:318fabd6708c 82 */
Tomo2k 3:318fabd6708c 83 void eraseSector(uint32_t addr);
stonie 0:d07f90d3c670 84
Tomo2k 3:318fabd6708c 85 //! Erases the whole flash to 0xFF
Tomo2k 3:318fabd6708c 86 void eraseMem();
Tomo2k 3:318fabd6708c 87
Tomo2k 3:318fabd6708c 88 //! Read detected flash size
Tomo2k 3:318fabd6708c 89 size_t flashSize() const {return _size;}
Tomo2k 3:318fabd6708c 90
Tomo2k 3:318fabd6708c 91 //! Read detected flash sector size
Tomo2k 3:318fabd6708c 92 size_t sectorSize() const {return _sectorSize;}
Tomo2k 3:318fabd6708c 93
Tomo2k 3:318fabd6708c 94 //! Read detected flash page size
Tomo2k 3:318fabd6708c 95 size_t pageSize() const {return _pageSize;}
stonie 0:d07f90d3c670 96
Tomo2k 3:318fabd6708c 97 private:
Tomo2k 3:318fabd6708c 98 bool writePage(uint32_t startAddr, const char* data, size_t len);
Tomo2k 3:318fabd6708c 99 int readStatus();
Tomo2k 3:318fabd6708c 100 void waitForWrite();
Tomo2k 3:318fabd6708c 101 void enableWrite();
stonie 0:d07f90d3c670 102
stonie 0:d07f90d3c670 103
Tomo2k 3:318fabd6708c 104 SPI* _spi;
Tomo2k 3:318fabd6708c 105 DigitalOut _enable;
Tomo2k 3:318fabd6708c 106 size_t _size, _pageSize, _sectorSize;
Tomo2k 3:318fabd6708c 107 };