Diff: flash25spi.cpp

Revision:

0:d07f90d3c670

Child:

1:aa6409c599cb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flash25spi.cpp	Sun Feb 20 09:19:04 2011 +0000
@@ -0,0 +1,261 @@
+/* This library is based on the Ser25lcxxx library by Hendrik Lipka
+* It was adapted to flash memory chips on 19.2.2011 by Klaus Steinhammer
+* the BSD license also applies to this code - have fun. 
+*/
+
+/*
+* Ser25lcxxx library
+* Copyright (c) 2010 Hendrik Lipka
+* 
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to deal
+* in the Software without restriction, including without limitation the rights
+* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+* copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+* 
+* The above copyright notice and this permission notice shall be included in
+* all copies or substantial portions of the Software.
+* 
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+* THE SOFTWARE.
+*/
+
+
+#include "flash25spi.h"
+#include "wait_api.h"
+
+//#define DEBUG
+
+struct dataBase {
+unsigned char vendor;
+unsigned char device;
+unsigned char capacity;
+unsigned int memsize;
+unsigned int blocksize;
+unsigned int sectorsize;
+unsigned int pagesize;
+};
+
+const struct dataBase devices[] = {
+// vendor, device, capacity,   memsize, blocksize, sectorsize, pagesize
+{    0x1c,   0x31,     0x10,   0x10000,    0x8000,     0x1000,    0x100}, // Manufacturer: EON, Device: EN25F05 (untested)
+{    0x1c,   0x31,     0x11,   0x20000,    0x8000,     0x1000,    0x100}, // Manufacturer: EON, Device: EN25F10 (untested)
+{    0x1c,   0x31,     0x12,   0x40000,   0x10000,     0x1000,    0x100}, // Manufacturer: EON, Device: EN25F20 (untested)
+{    0x1c,   0x31,     0x13,   0x80000,   0x10000,     0x1000,    0x100}, // Manufacturer: EON, Device: EN25F40 (untested)
+{    0x1c,   0x31,     0x14,  0x100000,   0x10000,     0x1000,    0x100}, // Manufacturer: EON, Device: EN25F80 (untested)
+{    0x1c,   0x31,     0x15,  0x200000,   0x10000,     0x1000,    0x100}, // Manufacturer: EON, Device: EN25F16 (untested)
+{    0x1c,   0x30,     0x15,  0x200000,   0x10000,     0x1000,    0x100}, // Manufacturer: EON, Device: EN25Q16 (untested)
+{    0x1c,   0x31,     0x16,  0x400000,   0x10000,     0x1000,    0x100}, // Manufacturer: EON, Device: EN25F32 (untested)
+{    0x1c,   0x30,     0x16,  0x400000,   0x10000,     0x1000,    0x100}, // Manufacturer: EON, Device: EN25Q32A
+{    0x1c,   0x30,     0x17,  0x800000,   0x10000,     0x1000,    0x100}, // Manufacturer: EON, Device: EN25Q64 (untested)
+{    0x1c,   0x30,     0x18, 0x1000000,   0x10000,     0x1000,    0x100}, // Manufacturer: EON, Device: EN25Q128 (untested)
+
+{    0x20,   0x20,     0x10,  0x10000,    0x8000,          0,    0x100}, // Manufacturer: Numonyx, Device: M25P05-A (untested)
+{    0x20,   0x20,     0x16, 0x400000,   0x10000,          0,    0x100}, // Manufacturer: Numonyx, Device: M25P32 (untested)
+{    0x00,   0x00,     0x00,     0x00,      0x00,       0x00,     0x00}, // end of table
+};
+
+
+#define HIGH(x) ((x&0xff0000)>>16)
+#define MID(x) ((x&0xff00)>>8)
+#define LOW(x) (x&0xff)
+
+flash25spi::flash25spi(SPI *spi, PinName enable, unsigned int bytes, unsigned int pagesize, unsigned int sectorsize) {
+    unsigned char chipid[3];
+    unsigned int i = 0;
+    _spi=spi;
+    _enable=new DigitalOut(enable);
+    _enable->write(1);
+    
+    wait_us(1000);
+     
+    _enable->write(0);
+    wait_us(1);
+    // send address
+    _spi->write(0x9f);
+    chipid[0] = _spi->write(0); // get vendor ID
+    chipid[1] = _spi->write(0); // get device ID
+    chipid[2] = _spi->write(0); // get capacity
+    wait_us(1);
+    _enable->write(1);
+    
+    _size = 0;
+
+#ifdef DEBUG
+    printf ("got flash ids: %x, %x, %x\n", chipid[0], chipid[1], chipid[2]);
+#endif
+
+    while (_size == 0) {
+#ifdef DEBUG
+        printf ("checking: %x, %x, %x\n", devices[i].vendor, devices[i].device, devices[i].capacity);
+#endif
+        if (devices[i].vendor == 0) {
+            printf("flash device not found\n");
+            return;
+        }
+        if ((chipid[0] == devices[i].vendor) &&
+            (chipid[1] == devices[i].device) &&
+            (chipid[2] == devices[i].capacity)) {
+                _size=devices[i].memsize;
+                _blockSize=devices[i].blocksize;
+                _sectorSize=devices[i].sectorsize;
+                _pageSize=devices[i].pagesize;
+#ifdef DEBUG
+                printf("device found: %x - %x, %x, %x, %x\n",i, _size, _blockSize, _sectorSize, _pageSize);
+#endif
+        }
+        else
+            i++;
+    }
+    return;
+}
+
+flash25spi::~flash25spi() {
+    delete _enable;
+}
+
+char* flash25spi::read(unsigned int startAdr, unsigned int len) {
+    // assertion
+    if (startAdr+len>_size)
+        return NULL;
+    char* ret=(char*)malloc(len);
+    if (!len) return NULL;
+    
+    _enable->write(0);
+    wait_us(1);
+    // send address
+    _spi->write(0x03);
+    _spi->write(HIGH(startAdr));
+    _spi->write(MID(startAdr));
+    _spi->write(LOW(startAdr));
+
+    // read data into buffer
+    for (unsigned int i=0;i<len;i++) {
+        ret[i]=_spi->write(0);
+    }
+    wait_us(1);
+    _enable->write(1);
+    return ret;
+}
+
+bool flash25spi::write(unsigned int startAdr, unsigned int len, const char* data) {
+    if (startAdr+len>_size)
+        return -1;
+
+    unsigned int ofs=0;
+    while (ofs<len) {
+        // calculate amount of data to write into current page
+        int pageLen=_pageSize-((startAdr+ofs)%_pageSize);
+        if (ofs+pageLen>len)
+            pageLen=len-ofs;
+        // write single page
+        bool b=writePage(startAdr+ofs,pageLen,data+ofs);
+        if (!b)
+            return false;
+        // and switch to next page
+        ofs+=pageLen;
+    }
+    return true;
+}
+
+bool flash25spi::writePage(unsigned int startAdr, unsigned int len, const char* data) {
+    enableWrite();
+
+    _enable->write(0);
+    wait_us(1);
+
+    _spi->write(0x02);
+    _spi->write(HIGH(startAdr));
+    _spi->write(MID(startAdr));
+    _spi->write(LOW(startAdr));
+
+    // do real write
+    for (unsigned int i=0;i<len;i++) {
+        _spi->write(data[i]);
+    }
+    wait_us(1);
+    // disable to start physical write
+    _enable->write(1);
+    
+    waitForWrite();
+
+    return true;
+}
+
+void flash25spi::clearSector(unsigned int addr) {
+    if (_sectorSize == 0) {
+        clearBlock(addr);
+        return;
+    }
+        
+    addr &= ~(_sectorSize-1);
+
+    enableWrite();
+    _enable->write(0);
+    wait_us(1);
+    _spi->write(0x20);
+    _spi->write(HIGH(addr));
+    _spi->write(MID(addr));
+    _spi->write(LOW(addr));
+    wait_us(1);
+    _enable->write(1);
+    waitForWrite();
+}
+
+void flash25spi::clearBlock(unsigned int addr) {
+    addr &= ~(_blockSize-1);
+
+    enableWrite();
+    _enable->write(0);
+    wait_us(1);
+    _spi->write(0xd8);
+    _spi->write(HIGH(addr));
+    _spi->write(MID(addr));
+    _spi->write(LOW(addr));
+    wait_us(1);
+    _enable->write(1);
+    waitForWrite();
+}
+
+void flash25spi::clearMem() {
+    enableWrite();
+    _enable->write(0);
+    wait_us(1);
+    _spi->write(0xc7);
+    wait_us(1);
+    _enable->write(1);
+    waitForWrite();
+}
+
+int flash25spi::readStatus() {
+    _enable->write(0);
+    wait_us(1);
+    _spi->write(0x5);
+    int status=_spi->write(0x00);
+    wait_us(1);
+    _enable->write(1);
+    return status;
+}
+
+void flash25spi::waitForWrite() {
+    while (true) {
+        if (0==readStatus()&1)
+            break;
+        wait_us(10);
+    }
+}
+
+void flash25spi::enableWrite()
+{
+    _enable->write(0);
+    wait_us(1);
+    _spi->write(0x06);
+    wait_us(1);
+    _enable->write(1);
+}