Samuel Mokrani
USBMSD SD card Hello World for Mbed platforms
Dependencies: mbed USBMSD_SD USBDevice
USBDevice/USBMSD/AT45.cpp@2:27a7e7f8d399, 2011-11-11 (annotated)
- Committer:
- samux
- Date:
- Fri Nov 11 15:22:53 2011 +0000
- Revision:
- 2:27a7e7f8d399
we have 2MB with the sdcard!!
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| samux |
2:27a7e7f8d399 | 1 | #include "AT45.h" |
| samux |
2:27a7e7f8d399 | 2 | #include "mbed.h" |
| samux |
2:27a7e7f8d399 | 3 | |
| samux |
2:27a7e7f8d399 | 4 | /* mbed Library - AT45 |
| samux |
2:27a7e7f8d399 | 5 | * (c)2007, cstyles |
| samux |
2:27a7e7f8d399 | 6 | */ |
| samux |
2:27a7e7f8d399 | 7 | |
| samux |
2:27a7e7f8d399 | 8 | |
| samux |
2:27a7e7f8d399 | 9 | |
| samux |
2:27a7e7f8d399 | 10 | /* |
| samux |
2:27a7e7f8d399 | 11 | * Constructor |
| samux |
2:27a7e7f8d399 | 12 | */ |
| samux |
2:27a7e7f8d399 | 13 | |
| samux |
2:27a7e7f8d399 | 14 | AT45::AT45(PinName mosi, PinName miso, PinName clk, PinName ncs) |
| samux |
2:27a7e7f8d399 | 15 | : _spi(mosi, miso, clk), _ncs(ncs) { |
| samux |
2:27a7e7f8d399 | 16 | |
| samux |
2:27a7e7f8d399 | 17 | _pages = -1; // number of pages |
| samux |
2:27a7e7f8d399 | 18 | _pagesize = -1; // size of pages 256/264, 512/528, 1024/1056 |
| samux |
2:27a7e7f8d399 | 19 | _devicesize = -1; // In bytes |
| samux |
2:27a7e7f8d399 | 20 | |
| samux |
2:27a7e7f8d399 | 21 | _buffer1address = -1; // page address in buffer 1 |
| samux |
2:27a7e7f8d399 | 22 | _buffer2address = -1; // page address in buffer 2 |
| samux |
2:27a7e7f8d399 | 23 | _lru = -1; // leas recently used buffer (for eviction) |
| samux |
2:27a7e7f8d399 | 24 | |
| samux |
2:27a7e7f8d399 | 25 | _reset(); // Populate all this stuff |
| samux |
2:27a7e7f8d399 | 26 | |
| samux |
2:27a7e7f8d399 | 27 | } |
| samux |
2:27a7e7f8d399 | 28 | |
| samux |
2:27a7e7f8d399 | 29 | |
| samux |
2:27a7e7f8d399 | 30 | |
| samux |
2:27a7e7f8d399 | 31 | |
| samux |
2:27a7e7f8d399 | 32 | |
| samux |
2:27a7e7f8d399 | 33 | /* |
| samux |
2:27a7e7f8d399 | 34 | * This is the reset function of the constructor. |
| samux |
2:27a7e7f8d399 | 35 | * Interrogate the part and set up some variables. |
| samux |
2:27a7e7f8d399 | 36 | */ |
| samux |
2:27a7e7f8d399 | 37 | |
| samux |
2:27a7e7f8d399 | 38 | void AT45::_reset() { |
| samux |
2:27a7e7f8d399 | 39 | int _id = 0; |
| samux |
2:27a7e7f8d399 | 40 | int _status = 0; |
| samux |
2:27a7e7f8d399 | 41 | |
| samux |
2:27a7e7f8d399 | 42 | _spi.format(8,0); |
| samux |
2:27a7e7f8d399 | 43 | _spi.frequency(5000000); |
| samux |
2:27a7e7f8d399 | 44 | |
| samux |
2:27a7e7f8d399 | 45 | _id = id(); |
| samux |
2:27a7e7f8d399 | 46 | _status = status(); |
| samux |
2:27a7e7f8d399 | 47 | |
| samux |
2:27a7e7f8d399 | 48 | if ( (_id & 0x1f) == 0x2) { // 1Mbit |
| samux |
2:27a7e7f8d399 | 49 | _devicesize = 131072; // size in bytes |
| samux |
2:27a7e7f8d399 | 50 | _pages = 512; // number of pages |
| samux |
2:27a7e7f8d399 | 51 | _blocks = 256; // Number of 512 byte blocks |
| samux |
2:27a7e7f8d399 | 52 | if (_status & 0x1) { |
| samux |
2:27a7e7f8d399 | 53 | _pagesize = 256;} |
| samux |
2:27a7e7f8d399 | 54 | else { |
| samux |
2:27a7e7f8d399 | 55 | _pagesize = 264;} |
| samux |
2:27a7e7f8d399 | 56 | } |
| samux |
2:27a7e7f8d399 | 57 | |
| samux |
2:27a7e7f8d399 | 58 | else if ( (_id & 0x1f) == 0x3) { // 2M |
| samux |
2:27a7e7f8d399 | 59 | _devicesize = 262144; // Size in bytes |
| samux |
2:27a7e7f8d399 | 60 | _pages = 1024; // Number of pages |
| samux |
2:27a7e7f8d399 | 61 | _blocks = 512; // Number of 512 byte blocks |
| samux |
2:27a7e7f8d399 | 62 | if (_status & 0x1) { |
| samux |
2:27a7e7f8d399 | 63 | _pagesize = 256;} |
| samux |
2:27a7e7f8d399 | 64 | else { |
| samux |
2:27a7e7f8d399 | 65 | _pagesize = 264;} |
| samux |
2:27a7e7f8d399 | 66 | } |
| samux |
2:27a7e7f8d399 | 67 | |
| samux |
2:27a7e7f8d399 | 68 | else if ( (_id & 0x1f) == 0x4) { // 4M |
| samux |
2:27a7e7f8d399 | 69 | _devicesize = 524288; |
| samux |
2:27a7e7f8d399 | 70 | _pages = 2048; |
| samux |
2:27a7e7f8d399 | 71 | _blocks = 1024; // Number of 512 byte blocks |
| samux |
2:27a7e7f8d399 | 72 | if (_status & 0x1) { |
| samux |
2:27a7e7f8d399 | 73 | _pagesize = 256;} |
| samux |
2:27a7e7f8d399 | 74 | else { |
| samux |
2:27a7e7f8d399 | 75 | _pagesize = 264;} |
| samux |
2:27a7e7f8d399 | 76 | } |
| samux |
2:27a7e7f8d399 | 77 | |
| samux |
2:27a7e7f8d399 | 78 | else if ( (_id & 0x1f) == 0x5) { // 8M |
| samux |
2:27a7e7f8d399 | 79 | _devicesize = 1048576; |
| samux |
2:27a7e7f8d399 | 80 | _pages = 4096; |
| samux |
2:27a7e7f8d399 | 81 | _blocks = 2048; // Number of 512 byte blocks |
| samux |
2:27a7e7f8d399 | 82 | if (_status & 0x1) { |
| samux |
2:27a7e7f8d399 | 83 | _pagesize = 256;} |
| samux |
2:27a7e7f8d399 | 84 | else { |
| samux |
2:27a7e7f8d399 | 85 | _pagesize = 264;} |
| samux |
2:27a7e7f8d399 | 86 | } |
| samux |
2:27a7e7f8d399 | 87 | |
| samux |
2:27a7e7f8d399 | 88 | else if ( (_id & 0x1f) == 0x6) { // 16M |
| samux |
2:27a7e7f8d399 | 89 | _devicesize = 2097152; |
| samux |
2:27a7e7f8d399 | 90 | _pages = 4096; |
| samux |
2:27a7e7f8d399 | 91 | _blocks = 4096; // Number of 512 byte blocks |
| samux |
2:27a7e7f8d399 | 92 | if (_status & 0x1) { |
| samux |
2:27a7e7f8d399 | 93 | _pagesize = 512;} |
| samux |
2:27a7e7f8d399 | 94 | else { |
| samux |
2:27a7e7f8d399 | 95 | _pagesize = 528;} |
| samux |
2:27a7e7f8d399 | 96 | } |
| samux |
2:27a7e7f8d399 | 97 | |
| samux |
2:27a7e7f8d399 | 98 | else if ( (_id & 0x1f) == 0x7) { // 32M |
| samux |
2:27a7e7f8d399 | 99 | _devicesize = 4194304; |
| samux |
2:27a7e7f8d399 | 100 | _pages = 8192; |
| samux |
2:27a7e7f8d399 | 101 | _blocks = 8192; // Number of 512 byte blocks |
| samux |
2:27a7e7f8d399 | 102 | if (_status & 0x1) { |
| samux |
2:27a7e7f8d399 | 103 | _pagesize = 512;} |
| samux |
2:27a7e7f8d399 | 104 | else { |
| samux |
2:27a7e7f8d399 | 105 | _pagesize = 528;} |
| samux |
2:27a7e7f8d399 | 106 | } |
| samux |
2:27a7e7f8d399 | 107 | |
| samux |
2:27a7e7f8d399 | 108 | else if ( (_id & 0x1f) == 0x8) { // 64M |
| samux |
2:27a7e7f8d399 | 109 | _devicesize = 8388608; |
| samux |
2:27a7e7f8d399 | 110 | _pages = 8192; |
| samux |
2:27a7e7f8d399 | 111 | _blocks = 16384; |
| samux |
2:27a7e7f8d399 | 112 | if (_status & 0x1) { |
| samux |
2:27a7e7f8d399 | 113 | _pagesize = 1024;} |
| samux |
2:27a7e7f8d399 | 114 | else { |
| samux |
2:27a7e7f8d399 | 115 | _pagesize = 1056;} |
| samux |
2:27a7e7f8d399 | 116 | } |
| samux |
2:27a7e7f8d399 | 117 | |
| samux |
2:27a7e7f8d399 | 118 | else { |
| samux |
2:27a7e7f8d399 | 119 | _devicesize = -1; |
| samux |
2:27a7e7f8d399 | 120 | _pages = -1; |
| samux |
2:27a7e7f8d399 | 121 | _pagesize = -1; |
| samux |
2:27a7e7f8d399 | 122 | } |
| samux |
2:27a7e7f8d399 | 123 | } |
| samux |
2:27a7e7f8d399 | 124 | |
| samux |
2:27a7e7f8d399 | 125 | |
| samux |
2:27a7e7f8d399 | 126 | |
| samux |
2:27a7e7f8d399 | 127 | |
| samux |
2:27a7e7f8d399 | 128 | |
| samux |
2:27a7e7f8d399 | 129 | /* |
| samux |
2:27a7e7f8d399 | 130 | * Select pulls nCS low, but also ensure SPI channel is formatted |
| samux |
2:27a7e7f8d399 | 131 | * This is so that another device sharing the same SPI pins |
| samux |
2:27a7e7f8d399 | 132 | * doenst leave it in an unknown state |
| samux |
2:27a7e7f8d399 | 133 | */ |
| samux |
2:27a7e7f8d399 | 134 | |
| samux |
2:27a7e7f8d399 | 135 | void AT45::_select() { |
| samux |
2:27a7e7f8d399 | 136 | // ensure that the SPI port is set up correctly still |
| samux |
2:27a7e7f8d399 | 137 | // This allows SPI channel sharing |
| samux |
2:27a7e7f8d399 | 138 | _spi.format(8,0); |
| samux |
2:27a7e7f8d399 | 139 | _spi.frequency(5000000); |
| samux |
2:27a7e7f8d399 | 140 | _ncs = 0; |
| samux |
2:27a7e7f8d399 | 141 | } |
| samux |
2:27a7e7f8d399 | 142 | |
| samux |
2:27a7e7f8d399 | 143 | |
| samux |
2:27a7e7f8d399 | 144 | |
| samux |
2:27a7e7f8d399 | 145 | |
| samux |
2:27a7e7f8d399 | 146 | |
| samux |
2:27a7e7f8d399 | 147 | /* |
| samux |
2:27a7e7f8d399 | 148 | * Deselect simply returns nCS to high |
| samux |
2:27a7e7f8d399 | 149 | */ |
| samux |
2:27a7e7f8d399 | 150 | void AT45::_deselect() { |
| samux |
2:27a7e7f8d399 | 151 | _ncs = 1; |
| samux |
2:27a7e7f8d399 | 152 | } |
| samux |
2:27a7e7f8d399 | 153 | |
| samux |
2:27a7e7f8d399 | 154 | |
| samux |
2:27a7e7f8d399 | 155 | |
| samux |
2:27a7e7f8d399 | 156 | |
| samux |
2:27a7e7f8d399 | 157 | |
| samux |
2:27a7e7f8d399 | 158 | /* |
| samux |
2:27a7e7f8d399 | 159 | * Work out the page address |
| samux |
2:27a7e7f8d399 | 160 | * If we have a 2^N page size, it is just the top N bits |
| samux |
2:27a7e7f8d399 | 161 | * If we have non-2^N, we use the shifted address |
| samux |
2:27a7e7f8d399 | 162 | */ |
| samux |
2:27a7e7f8d399 | 163 | |
| samux |
2:27a7e7f8d399 | 164 | int AT45::_getpaddr(int address) { |
| samux |
2:27a7e7f8d399 | 165 | |
| samux |
2:27a7e7f8d399 | 166 | int paddr; |
| samux |
2:27a7e7f8d399 | 167 | |
| samux |
2:27a7e7f8d399 | 168 | if (_pagesize == 256) { |
| samux |
2:27a7e7f8d399 | 169 | paddr = address & 0xffffff00;} |
| samux |
2:27a7e7f8d399 | 170 | else if (_pagesize == 264) { |
| samux |
2:27a7e7f8d399 | 171 | paddr = (address << 1) & 0xfffffe00;} |
| samux |
2:27a7e7f8d399 | 172 | else if (_pagesize == 512) { |
| samux |
2:27a7e7f8d399 | 173 | paddr = address & 0xfffffe00;} |
| samux |
2:27a7e7f8d399 | 174 | else if (_pagesize == 528 ) { |
| samux |
2:27a7e7f8d399 | 175 | paddr = (address << 1) & 0xfffffc00;} |
| samux |
2:27a7e7f8d399 | 176 | else if (_pagesize == 1024) { |
| samux |
2:27a7e7f8d399 | 177 | paddr = address & 0xfffffc00;} |
| samux |
2:27a7e7f8d399 | 178 | else if (_pagesize == 1056 ) { |
| samux |
2:27a7e7f8d399 | 179 | paddr = (address << 1) & 0xfffff800;} |
| samux |
2:27a7e7f8d399 | 180 | else { |
| samux |
2:27a7e7f8d399 | 181 | paddr = 0xdeadbeef;} |
| samux |
2:27a7e7f8d399 | 182 | |
| samux |
2:27a7e7f8d399 | 183 | return (paddr); |
| samux |
2:27a7e7f8d399 | 184 | |
| samux |
2:27a7e7f8d399 | 185 | } |
| samux |
2:27a7e7f8d399 | 186 | |
| samux |
2:27a7e7f8d399 | 187 | |
| samux |
2:27a7e7f8d399 | 188 | |
| samux |
2:27a7e7f8d399 | 189 | |
| samux |
2:27a7e7f8d399 | 190 | |
| samux |
2:27a7e7f8d399 | 191 | /* |
| samux |
2:27a7e7f8d399 | 192 | * Clean the buffer address. This is the 8/9/10 LSBs |
| samux |
2:27a7e7f8d399 | 193 | */ |
| samux |
2:27a7e7f8d399 | 194 | |
| samux |
2:27a7e7f8d399 | 195 | int AT45::_getbaddr(int address) { |
| samux |
2:27a7e7f8d399 | 196 | |
| samux |
2:27a7e7f8d399 | 197 | int baddr; |
| samux |
2:27a7e7f8d399 | 198 | |
| samux |
2:27a7e7f8d399 | 199 | if ((_pagesize == 256) || (_pagesize == 264 )) { |
| samux |
2:27a7e7f8d399 | 200 | baddr = address & 0xff;} |
| samux |
2:27a7e7f8d399 | 201 | else if ((_pagesize == 512) || (_pagesize == 528 )) { |
| samux |
2:27a7e7f8d399 | 202 | baddr = address & 0x1ff;} |
| samux |
2:27a7e7f8d399 | 203 | else if ((_pagesize == 1024) || (_pagesize == 1056 )) { |
| samux |
2:27a7e7f8d399 | 204 | baddr = address & 0x3ff;} |
| samux |
2:27a7e7f8d399 | 205 | else { |
| samux |
2:27a7e7f8d399 | 206 | baddr = 0xcafebabe;} |
| samux |
2:27a7e7f8d399 | 207 | |
| samux |
2:27a7e7f8d399 | 208 | return (baddr); |
| samux |
2:27a7e7f8d399 | 209 | } |
| samux |
2:27a7e7f8d399 | 210 | |
| samux |
2:27a7e7f8d399 | 211 | |
| samux |
2:27a7e7f8d399 | 212 | |
| samux |
2:27a7e7f8d399 | 213 | |
| samux |
2:27a7e7f8d399 | 214 | |
| samux |
2:27a7e7f8d399 | 215 | /* |
| samux |
2:27a7e7f8d399 | 216 | * Return the Id of the part |
| samux |
2:27a7e7f8d399 | 217 | */ |
| samux |
2:27a7e7f8d399 | 218 | |
| samux |
2:27a7e7f8d399 | 219 | int AT45::id() { |
| samux |
2:27a7e7f8d399 | 220 | int id = 0; |
| samux |
2:27a7e7f8d399 | 221 | _select(); |
| samux |
2:27a7e7f8d399 | 222 | _spi.write(0x9f); |
| samux |
2:27a7e7f8d399 | 223 | id = (_spi.write(0x00) << 8); |
| samux |
2:27a7e7f8d399 | 224 | id |= _spi.write(0x00); |
| samux |
2:27a7e7f8d399 | 225 | _deselect(); |
| samux |
2:27a7e7f8d399 | 226 | return id; |
| samux |
2:27a7e7f8d399 | 227 | } |
| samux |
2:27a7e7f8d399 | 228 | |
| samux |
2:27a7e7f8d399 | 229 | |
| samux |
2:27a7e7f8d399 | 230 | |
| samux |
2:27a7e7f8d399 | 231 | |
| samux |
2:27a7e7f8d399 | 232 | |
| samux |
2:27a7e7f8d399 | 233 | /* |
| samux |
2:27a7e7f8d399 | 234 | * return the Status |
| samux |
2:27a7e7f8d399 | 235 | */ |
| samux |
2:27a7e7f8d399 | 236 | |
| samux |
2:27a7e7f8d399 | 237 | int AT45::status() { |
| samux |
2:27a7e7f8d399 | 238 | int status = 0; |
| samux |
2:27a7e7f8d399 | 239 | _select(); |
| samux |
2:27a7e7f8d399 | 240 | _spi.write(0xd7); |
| samux |
2:27a7e7f8d399 | 241 | status = (_spi.write(0x00) << 8 ); |
| samux |
2:27a7e7f8d399 | 242 | status |= _spi.write(0x00); |
| samux |
2:27a7e7f8d399 | 243 | _deselect(); |
| samux |
2:27a7e7f8d399 | 244 | return status; |
| samux |
2:27a7e7f8d399 | 245 | } |
| samux |
2:27a7e7f8d399 | 246 | |
| samux |
2:27a7e7f8d399 | 247 | |
| samux |
2:27a7e7f8d399 | 248 | |
| samux |
2:27a7e7f8d399 | 249 | |
| samux |
2:27a7e7f8d399 | 250 | |
| samux |
2:27a7e7f8d399 | 251 | /* |
| samux |
2:27a7e7f8d399 | 252 | * Erase the entire chip |
| samux |
2:27a7e7f8d399 | 253 | */ |
| samux |
2:27a7e7f8d399 | 254 | |
| samux |
2:27a7e7f8d399 | 255 | void AT45::erase() { |
| samux |
2:27a7e7f8d399 | 256 | |
| samux |
2:27a7e7f8d399 | 257 | _pollbusy(); // make sure flash isnt already in busy. |
| samux |
2:27a7e7f8d399 | 258 | |
| samux |
2:27a7e7f8d399 | 259 | // There are errata on this. For now, do itthe long way :-( |
| samux |
2:27a7e7f8d399 | 260 | _select(); |
| samux |
2:27a7e7f8d399 | 261 | // 4 byte command sequence |
| samux |
2:27a7e7f8d399 | 262 | _spi.write(0xc7); |
| samux |
2:27a7e7f8d399 | 263 | _spi.write(0x94); |
| samux |
2:27a7e7f8d399 | 264 | _spi.write(0x80); |
| samux |
2:27a7e7f8d399 | 265 | _spi.write(0x9a); |
| samux |
2:27a7e7f8d399 | 266 | _deselect(); |
| samux |
2:27a7e7f8d399 | 267 | |
| samux |
2:27a7e7f8d399 | 268 | _pollbusy(); // Make erase a blocking function |
| samux |
2:27a7e7f8d399 | 269 | |
| samux |
2:27a7e7f8d399 | 270 | } |
| samux |
2:27a7e7f8d399 | 271 | |
| samux |
2:27a7e7f8d399 | 272 | |
| samux |
2:27a7e7f8d399 | 273 | |
| samux |
2:27a7e7f8d399 | 274 | |
| samux |
2:27a7e7f8d399 | 275 | |
| samux |
2:27a7e7f8d399 | 276 | /* |
| samux |
2:27a7e7f8d399 | 277 | * return the size of the part in bytes |
| samux |
2:27a7e7f8d399 | 278 | */ |
| samux |
2:27a7e7f8d399 | 279 | |
| samux |
2:27a7e7f8d399 | 280 | int AT45::size() { |
| samux |
2:27a7e7f8d399 | 281 | return _devicesize; |
| samux |
2:27a7e7f8d399 | 282 | } |
| samux |
2:27a7e7f8d399 | 283 | |
| samux |
2:27a7e7f8d399 | 284 | |
| samux |
2:27a7e7f8d399 | 285 | |
| samux |
2:27a7e7f8d399 | 286 | |
| samux |
2:27a7e7f8d399 | 287 | |
| samux |
2:27a7e7f8d399 | 288 | /* |
| samux |
2:27a7e7f8d399 | 289 | * return the page size of the part in bytes |
| samux |
2:27a7e7f8d399 | 290 | */ |
| samux |
2:27a7e7f8d399 | 291 | |
| samux |
2:27a7e7f8d399 | 292 | int AT45::pagesize() { |
| samux |
2:27a7e7f8d399 | 293 | return _pagesize; |
| samux |
2:27a7e7f8d399 | 294 | } |
| samux |
2:27a7e7f8d399 | 295 | |
| samux |
2:27a7e7f8d399 | 296 | |
| samux |
2:27a7e7f8d399 | 297 | |
| samux |
2:27a7e7f8d399 | 298 | |
| samux |
2:27a7e7f8d399 | 299 | |
| samux |
2:27a7e7f8d399 | 300 | /* |
| samux |
2:27a7e7f8d399 | 301 | * return the numbers of pages |
| samux |
2:27a7e7f8d399 | 302 | */ |
| samux |
2:27a7e7f8d399 | 303 | |
| samux |
2:27a7e7f8d399 | 304 | int AT45::pages() { |
| samux |
2:27a7e7f8d399 | 305 | return _pages; |
| samux |
2:27a7e7f8d399 | 306 | } |
| samux |
2:27a7e7f8d399 | 307 | |
| samux |
2:27a7e7f8d399 | 308 | |
| samux |
2:27a7e7f8d399 | 309 | |
| samux |
2:27a7e7f8d399 | 310 | |
| samux |
2:27a7e7f8d399 | 311 | |
| samux |
2:27a7e7f8d399 | 312 | /* |
| samux |
2:27a7e7f8d399 | 313 | * Make sure the Flash isnt already doing something |
| samux |
2:27a7e7f8d399 | 314 | */ |
| samux |
2:27a7e7f8d399 | 315 | void AT45::_pollbusy() { |
| samux |
2:27a7e7f8d399 | 316 | volatile int busy = 1; |
| samux |
2:27a7e7f8d399 | 317 | while (busy) { |
| samux |
2:27a7e7f8d399 | 318 | // if bit 7 is set, we can proceed |
| samux |
2:27a7e7f8d399 | 319 | if ( status() & 0x80 ) { |
| samux |
2:27a7e7f8d399 | 320 | busy = 0;} |
| samux |
2:27a7e7f8d399 | 321 | } |
| samux |
2:27a7e7f8d399 | 322 | } |
| samux |
2:27a7e7f8d399 | 323 | |
| samux |
2:27a7e7f8d399 | 324 | |
| samux |
2:27a7e7f8d399 | 325 | |
| samux |
2:27a7e7f8d399 | 326 | |
| samux |
2:27a7e7f8d399 | 327 | |
| samux |
2:27a7e7f8d399 | 328 | /* |
| samux |
2:27a7e7f8d399 | 329 | * Make sure the Flash isnt already doing something |
| samux |
2:27a7e7f8d399 | 330 | */ |
| samux |
2:27a7e7f8d399 | 331 | |
| samux |
2:27a7e7f8d399 | 332 | void AT45::pollbusy() { |
| samux |
2:27a7e7f8d399 | 333 | _pollbusy(); |
| samux |
2:27a7e7f8d399 | 334 | } |
| samux |
2:27a7e7f8d399 | 335 | |
| samux |
2:27a7e7f8d399 | 336 | |
| samux |
2:27a7e7f8d399 | 337 | |
| samux |
2:27a7e7f8d399 | 338 | |
| samux |
2:27a7e7f8d399 | 339 | |
| samux |
2:27a7e7f8d399 | 340 | /* |
| samux |
2:27a7e7f8d399 | 341 | * This function returns the char |
| samux |
2:27a7e7f8d399 | 342 | */ |
| samux |
2:27a7e7f8d399 | 343 | |
| samux |
2:27a7e7f8d399 | 344 | char AT45::read(int address) { |
| samux |
2:27a7e7f8d399 | 345 | // return byte from address |
| samux |
2:27a7e7f8d399 | 346 | return (_memread( address )); |
| samux |
2:27a7e7f8d399 | 347 | } |
| samux |
2:27a7e7f8d399 | 348 | |
| samux |
2:27a7e7f8d399 | 349 | |
| samux |
2:27a7e7f8d399 | 350 | |
| samux |
2:27a7e7f8d399 | 351 | |
| samux |
2:27a7e7f8d399 | 352 | |
| samux |
2:27a7e7f8d399 | 353 | /* |
| samux |
2:27a7e7f8d399 | 354 | * This function writes the char to the address supplied |
| samux |
2:27a7e7f8d399 | 355 | * Note : We pass the raw address to the underlying functions |
| samux |
2:27a7e7f8d399 | 356 | */ |
| samux |
2:27a7e7f8d399 | 357 | |
| samux |
2:27a7e7f8d399 | 358 | void AT45::write(int address, char data) { |
| samux |
2:27a7e7f8d399 | 359 | |
| samux |
2:27a7e7f8d399 | 360 | _pollbusy(); |
| samux |
2:27a7e7f8d399 | 361 | _flashread(1,address); // read the Flash page into SRAM buffer |
| samux |
2:27a7e7f8d399 | 362 | _pollbusy(); // wait for the read to complete |
| samux |
2:27a7e7f8d399 | 363 | _sramwrite(1,address,data); // Write new data into SRAM |
| samux |
2:27a7e7f8d399 | 364 | _pollbusy(); // Make sure flash isnt busy |
| samux |
2:27a7e7f8d399 | 365 | _flashwrite(1,address); // Write back to the page address |
| samux |
2:27a7e7f8d399 | 366 | } |
| samux |
2:27a7e7f8d399 | 367 | |
| samux |
2:27a7e7f8d399 | 368 | |
| samux |
2:27a7e7f8d399 | 369 | |
| samux |
2:27a7e7f8d399 | 370 | |
| samux |
2:27a7e7f8d399 | 371 | |
| samux |
2:27a7e7f8d399 | 372 | /* |
| samux |
2:27a7e7f8d399 | 373 | * Read from an SRAM buffer |
| samux |
2:27a7e7f8d399 | 374 | * Note : We create buffer and page addresses in _sram and _flash |
| samux |
2:27a7e7f8d399 | 375 | */ |
| samux |
2:27a7e7f8d399 | 376 | |
| samux |
2:27a7e7f8d399 | 377 | int AT45::_sramread(int buffer, int address) { |
| samux |
2:27a7e7f8d399 | 378 | |
| samux |
2:27a7e7f8d399 | 379 | int cmd = 0; |
| samux |
2:27a7e7f8d399 | 380 | int baddr = 0; |
| samux |
2:27a7e7f8d399 | 381 | |
| samux |
2:27a7e7f8d399 | 382 | baddr = _getbaddr(address); |
| samux |
2:27a7e7f8d399 | 383 | |
| samux |
2:27a7e7f8d399 | 384 | _select(); |
| samux |
2:27a7e7f8d399 | 385 | |
| samux |
2:27a7e7f8d399 | 386 | if(buffer == 1) |
| samux |
2:27a7e7f8d399 | 387 | {cmd = 0xd4;} |
| samux |
2:27a7e7f8d399 | 388 | else |
| samux |
2:27a7e7f8d399 | 389 | {cmd = 0xd6;} |
| samux |
2:27a7e7f8d399 | 390 | |
| samux |
2:27a7e7f8d399 | 391 | _spi.write(cmd); |
| samux |
2:27a7e7f8d399 | 392 | _sendaddr (baddr); |
| samux |
2:27a7e7f8d399 | 393 | _spi.write (0x0); // dont care byte |
| samux |
2:27a7e7f8d399 | 394 | cmd = _spi.write (0x0); |
| samux |
2:27a7e7f8d399 | 395 | |
| samux |
2:27a7e7f8d399 | 396 | _deselect(); |
| samux |
2:27a7e7f8d399 | 397 | |
| samux |
2:27a7e7f8d399 | 398 | return (cmd); |
| samux |
2:27a7e7f8d399 | 399 | } |
| samux |
2:27a7e7f8d399 | 400 | |
| samux |
2:27a7e7f8d399 | 401 | |
| samux |
2:27a7e7f8d399 | 402 | |
| samux |
2:27a7e7f8d399 | 403 | |
| samux |
2:27a7e7f8d399 | 404 | |
| samux |
2:27a7e7f8d399 | 405 | |
| samux |
2:27a7e7f8d399 | 406 | /* |
| samux |
2:27a7e7f8d399 | 407 | * Write to an SRAM buffer |
| samux |
2:27a7e7f8d399 | 408 | * Note : We create buffer and page addresses in _sram and _flash |
| samux |
2:27a7e7f8d399 | 409 | */ |
| samux |
2:27a7e7f8d399 | 410 | |
| samux |
2:27a7e7f8d399 | 411 | void AT45::_sramwrite(int buffer, int address, int data) { |
| samux |
2:27a7e7f8d399 | 412 | |
| samux |
2:27a7e7f8d399 | 413 | int cmd = 0; |
| samux |
2:27a7e7f8d399 | 414 | int baddr = 0; |
| samux |
2:27a7e7f8d399 | 415 | |
| samux |
2:27a7e7f8d399 | 416 | baddr = _getbaddr(address); |
| samux |
2:27a7e7f8d399 | 417 | |
| samux |
2:27a7e7f8d399 | 418 | _pollbusy(); |
| samux |
2:27a7e7f8d399 | 419 | |
| samux |
2:27a7e7f8d399 | 420 | _select(); |
| samux |
2:27a7e7f8d399 | 421 | |
| samux |
2:27a7e7f8d399 | 422 | if (buffer == 1) |
| samux |
2:27a7e7f8d399 | 423 | {cmd = 0x84;} |
| samux |
2:27a7e7f8d399 | 424 | else |
| samux |
2:27a7e7f8d399 | 425 | {cmd = 0x87;} |
| samux |
2:27a7e7f8d399 | 426 | |
| samux |
2:27a7e7f8d399 | 427 | _spi.write(cmd); |
| samux |
2:27a7e7f8d399 | 428 | _sendaddr (baddr); |
| samux |
2:27a7e7f8d399 | 429 | _spi.write (data); |
| samux |
2:27a7e7f8d399 | 430 | |
| samux |
2:27a7e7f8d399 | 431 | _deselect(); |
| samux |
2:27a7e7f8d399 | 432 | } |
| samux |
2:27a7e7f8d399 | 433 | |
| samux |
2:27a7e7f8d399 | 434 | |
| samux |
2:27a7e7f8d399 | 435 | |
| samux |
2:27a7e7f8d399 | 436 | |
| samux |
2:27a7e7f8d399 | 437 | |
| samux |
2:27a7e7f8d399 | 438 | /* |
| samux |
2:27a7e7f8d399 | 439 | * Read from Flash memory into SRAM buffer |
| samux |
2:27a7e7f8d399 | 440 | */ |
| samux |
2:27a7e7f8d399 | 441 | |
| samux |
2:27a7e7f8d399 | 442 | void AT45::_flashread (int buffer, int address) { |
| samux |
2:27a7e7f8d399 | 443 | |
| samux |
2:27a7e7f8d399 | 444 | int cmd = 0; |
| samux |
2:27a7e7f8d399 | 445 | int paddr = _getpaddr(address); // calculate page address |
| samux |
2:27a7e7f8d399 | 446 | |
| samux |
2:27a7e7f8d399 | 447 | _pollbusy(); // Check flash is not busy |
| samux |
2:27a7e7f8d399 | 448 | _select(); |
| samux |
2:27a7e7f8d399 | 449 | |
| samux |
2:27a7e7f8d399 | 450 | if (buffer == 1) |
| samux |
2:27a7e7f8d399 | 451 | {cmd = 0x53;} |
| samux |
2:27a7e7f8d399 | 452 | else |
| samux |
2:27a7e7f8d399 | 453 | {cmd = 0x55;} |
| samux |
2:27a7e7f8d399 | 454 | |
| samux |
2:27a7e7f8d399 | 455 | _spi.write (cmd); |
| samux |
2:27a7e7f8d399 | 456 | _sendaddr (paddr); |
| samux |
2:27a7e7f8d399 | 457 | _deselect(); |
| samux |
2:27a7e7f8d399 | 458 | |
| samux |
2:27a7e7f8d399 | 459 | } |
| samux |
2:27a7e7f8d399 | 460 | |
| samux |
2:27a7e7f8d399 | 461 | |
| samux |
2:27a7e7f8d399 | 462 | |
| samux |
2:27a7e7f8d399 | 463 | |
| samux |
2:27a7e7f8d399 | 464 | |
| samux |
2:27a7e7f8d399 | 465 | /* |
| samux |
2:27a7e7f8d399 | 466 | * Write and SRAM buffer back to main memory |
| samux |
2:27a7e7f8d399 | 467 | */ |
| samux |
2:27a7e7f8d399 | 468 | |
| samux |
2:27a7e7f8d399 | 469 | void AT45::_flashwrite (int buffer, int address) { |
| samux |
2:27a7e7f8d399 | 470 | |
| samux |
2:27a7e7f8d399 | 471 | int cmd = 0; |
| samux |
2:27a7e7f8d399 | 472 | int paddr = _getpaddr(address); |
| samux |
2:27a7e7f8d399 | 473 | |
| samux |
2:27a7e7f8d399 | 474 | _pollbusy(); // Check flash is not busy |
| samux |
2:27a7e7f8d399 | 475 | |
| samux |
2:27a7e7f8d399 | 476 | _select(); |
| samux |
2:27a7e7f8d399 | 477 | |
| samux |
2:27a7e7f8d399 | 478 | if (buffer == 1) |
| samux |
2:27a7e7f8d399 | 479 | {cmd = 0x83;} |
| samux |
2:27a7e7f8d399 | 480 | else |
| samux |
2:27a7e7f8d399 | 481 | {cmd = 0x86;} |
| samux |
2:27a7e7f8d399 | 482 | |
| samux |
2:27a7e7f8d399 | 483 | _spi.write (cmd); |
| samux |
2:27a7e7f8d399 | 484 | _sendaddr (paddr); |
| samux |
2:27a7e7f8d399 | 485 | _deselect(); |
| samux |
2:27a7e7f8d399 | 486 | |
| samux |
2:27a7e7f8d399 | 487 | _pollbusy(); // Check flash is not busy |
| samux |
2:27a7e7f8d399 | 488 | |
| samux |
2:27a7e7f8d399 | 489 | } |
| samux |
2:27a7e7f8d399 | 490 | |
| samux |
2:27a7e7f8d399 | 491 | |
| samux |
2:27a7e7f8d399 | 492 | |
| samux |
2:27a7e7f8d399 | 493 | |
| samux |
2:27a7e7f8d399 | 494 | |
| samux |
2:27a7e7f8d399 | 495 | /* |
| samux |
2:27a7e7f8d399 | 496 | * Read directly from main memory |
| samux |
2:27a7e7f8d399 | 497 | */ |
| samux |
2:27a7e7f8d399 | 498 | |
| samux |
2:27a7e7f8d399 | 499 | int AT45::_memread (int address) { |
| samux |
2:27a7e7f8d399 | 500 | |
| samux |
2:27a7e7f8d399 | 501 | int data = 0; |
| samux |
2:27a7e7f8d399 | 502 | int addr; |
| samux |
2:27a7e7f8d399 | 503 | |
| samux |
2:27a7e7f8d399 | 504 | addr = _getpaddr(address) | _getbaddr(address); |
| samux |
2:27a7e7f8d399 | 505 | |
| samux |
2:27a7e7f8d399 | 506 | _pollbusy(); |
| samux |
2:27a7e7f8d399 | 507 | |
| samux |
2:27a7e7f8d399 | 508 | _select(); |
| samux |
2:27a7e7f8d399 | 509 | |
| samux |
2:27a7e7f8d399 | 510 | _spi.write (0xd2); // Direct read command |
| samux |
2:27a7e7f8d399 | 511 | _sendaddr (addr); |
| samux |
2:27a7e7f8d399 | 512 | |
| samux |
2:27a7e7f8d399 | 513 | // 4 dont care bytes |
| samux |
2:27a7e7f8d399 | 514 | _spi.write (0x00); |
| samux |
2:27a7e7f8d399 | 515 | _spi.write (0x00); |
| samux |
2:27a7e7f8d399 | 516 | _spi.write (0x00); |
| samux |
2:27a7e7f8d399 | 517 | _spi.write (0x00); |
| samux |
2:27a7e7f8d399 | 518 | |
| samux |
2:27a7e7f8d399 | 519 | // this one clocks the data |
| samux |
2:27a7e7f8d399 | 520 | data = _spi.write (0x00); |
| samux |
2:27a7e7f8d399 | 521 | _deselect(); |
| samux |
2:27a7e7f8d399 | 522 | |
| samux |
2:27a7e7f8d399 | 523 | _pollbusy(); |
| samux |
2:27a7e7f8d399 | 524 | |
| samux |
2:27a7e7f8d399 | 525 | return data; |
| samux |
2:27a7e7f8d399 | 526 | } |
| samux |
2:27a7e7f8d399 | 527 | |
| samux |
2:27a7e7f8d399 | 528 | |
| samux |
2:27a7e7f8d399 | 529 | |
| samux |
2:27a7e7f8d399 | 530 | |
| samux |
2:27a7e7f8d399 | 531 | |
| samux |
2:27a7e7f8d399 | 532 | /* |
| samux |
2:27a7e7f8d399 | 533 | * Sends the three lest significant bytes of the supplied address |
| samux |
2:27a7e7f8d399 | 534 | */ |
| samux |
2:27a7e7f8d399 | 535 | |
| samux |
2:27a7e7f8d399 | 536 | void AT45::_sendaddr (int address) { |
| samux |
2:27a7e7f8d399 | 537 | _spi.write(address >> 16); |
| samux |
2:27a7e7f8d399 | 538 | _spi.write(address >> 8); |
| samux |
2:27a7e7f8d399 | 539 | _spi.write(address); |
| samux |
2:27a7e7f8d399 | 540 | } |
| samux |
2:27a7e7f8d399 | 541 | |
| samux |
2:27a7e7f8d399 | 542 | |
| samux |
2:27a7e7f8d399 | 543 | |
| samux |
2:27a7e7f8d399 | 544 | |
| samux |
2:27a7e7f8d399 | 545 | |
| samux |
2:27a7e7f8d399 | 546 | /* |
| samux |
2:27a7e7f8d399 | 547 | * Return the number of 512 byte blocks in this device |
| samux |
2:27a7e7f8d399 | 548 | */ |
| samux |
2:27a7e7f8d399 | 549 | |
| samux |
2:27a7e7f8d399 | 550 | int AT45::blocks(void) { |
| samux |
2:27a7e7f8d399 | 551 | return _blocks; |
| samux |
2:27a7e7f8d399 | 552 | } |
| samux |
2:27a7e7f8d399 | 553 | |
| samux |
2:27a7e7f8d399 | 554 | |
| samux |
2:27a7e7f8d399 | 555 | |
| samux |
2:27a7e7f8d399 | 556 | |
| samux |
2:27a7e7f8d399 | 557 | |
| samux |
2:27a7e7f8d399 | 558 | /* |
| samux |
2:27a7e7f8d399 | 559 | * Read the numbered block into the data array supplied |
| samux |
2:27a7e7f8d399 | 560 | */ |
| samux |
2:27a7e7f8d399 | 561 | |
| samux |
2:27a7e7f8d399 | 562 | int AT45::blockread (char* data, int block) { |
| samux |
2:27a7e7f8d399 | 563 | |
| samux |
2:27a7e7f8d399 | 564 | // For 256 byte pages, we read two pages |
| samux |
2:27a7e7f8d399 | 565 | if((_pagesize == 256) || (_pagesize == 264)) { |
| samux |
2:27a7e7f8d399 | 566 | |
| samux |
2:27a7e7f8d399 | 567 | int address = block * 512; // This is the start address of the 512 byte block |
| samux |
2:27a7e7f8d399 | 568 | |
| samux |
2:27a7e7f8d399 | 569 | _flashread(1,address); // read the first page of the block into SRAM buffer 1 |
| samux |
2:27a7e7f8d399 | 570 | _pollbusy(); // Wait until First page has loaded into buffer 1 |
| samux |
2:27a7e7f8d399 | 571 | |
| samux |
2:27a7e7f8d399 | 572 | // I'll do this directly as we are reading back an entire buffer, and this can be done more optimally |
| samux |
2:27a7e7f8d399 | 573 | // than using _sramread |
| samux |
2:27a7e7f8d399 | 574 | _select(); |
| samux |
2:27a7e7f8d399 | 575 | _spi.write(0xd4); |
| samux |
2:27a7e7f8d399 | 576 | _sendaddr (0x0); |
| samux |
2:27a7e7f8d399 | 577 | _spi.write (0x0); // dont care byte |
| samux |
2:27a7e7f8d399 | 578 | |
| samux |
2:27a7e7f8d399 | 579 | for(int i=0;i<256;i++) { |
| samux |
2:27a7e7f8d399 | 580 | data[i] = _spi.write (0x0); |
| samux |
2:27a7e7f8d399 | 581 | } |
| samux |
2:27a7e7f8d399 | 582 | _deselect(); |
| samux |
2:27a7e7f8d399 | 583 | |
| samux |
2:27a7e7f8d399 | 584 | _flashread(1,address+256); // read the second page of the block into SRAM buffer 2 |
| samux |
2:27a7e7f8d399 | 585 | _pollbusy(); // Wait until second page has loaded into buffer 2 |
| samux |
2:27a7e7f8d399 | 586 | |
| samux |
2:27a7e7f8d399 | 587 | // Now the second page is loaded, pull this out into the second half of the data buffer |
| samux |
2:27a7e7f8d399 | 588 | // I'll do this directly as we are reading back an entire buffer, and this can be done more optimally |
| samux |
2:27a7e7f8d399 | 589 | // than using _sramread |
| samux |
2:27a7e7f8d399 | 590 | _select(); |
| samux |
2:27a7e7f8d399 | 591 | _spi.write(0xd4); |
| samux |
2:27a7e7f8d399 | 592 | _sendaddr (0x0); |
| samux |
2:27a7e7f8d399 | 593 | _spi.write (0x0); // dont care byte |
| samux |
2:27a7e7f8d399 | 594 | |
| samux |
2:27a7e7f8d399 | 595 | for(int i=0;i<256;i++) { |
| samux |
2:27a7e7f8d399 | 596 | data[256+i] = _spi.write (0x0); |
| samux |
2:27a7e7f8d399 | 597 | } |
| samux |
2:27a7e7f8d399 | 598 | _deselect(); |
| samux |
2:27a7e7f8d399 | 599 | return (0); |
| samux |
2:27a7e7f8d399 | 600 | } |
| samux |
2:27a7e7f8d399 | 601 | |
| samux |
2:27a7e7f8d399 | 602 | |
| samux |
2:27a7e7f8d399 | 603 | // For 512 byte pages, we read just the single page, transfer it |
| samux |
2:27a7e7f8d399 | 604 | else if((_pagesize == 512) || (_pagesize == 528)) { |
| samux |
2:27a7e7f8d399 | 605 | |
| samux |
2:27a7e7f8d399 | 606 | int address = block * 512; // This is the start address of the 512 byte block |
| samux |
2:27a7e7f8d399 | 607 | |
| samux |
2:27a7e7f8d399 | 608 | _pollbusy(); // Wait until First page has loaded into buffer 1 |
| samux |
2:27a7e7f8d399 | 609 | _flashread(1,address); // read the first page of the block into SRAM buffer 1 |
| samux |
2:27a7e7f8d399 | 610 | _pollbusy(); // Wait until First page has loaded into buffer 1 |
| samux |
2:27a7e7f8d399 | 611 | |
| samux |
2:27a7e7f8d399 | 612 | // Now the page has loaded, simply transfer it from the sram buffer to the data array |
| samux |
2:27a7e7f8d399 | 613 | // I'll do this directly as we are reading back an entire buffer, and this can be done more optimally |
| samux |
2:27a7e7f8d399 | 614 | // than using _sramread |
| samux |
2:27a7e7f8d399 | 615 | _select(); |
| samux |
2:27a7e7f8d399 | 616 | _spi.write(0xd4); |
| samux |
2:27a7e7f8d399 | 617 | _sendaddr (0x0); |
| samux |
2:27a7e7f8d399 | 618 | _spi.write (0x0); // dont care byte |
| samux |
2:27a7e7f8d399 | 619 | |
| samux |
2:27a7e7f8d399 | 620 | for(int i=0;i<512;i++) { |
| samux |
2:27a7e7f8d399 | 621 | data[i] = _spi.write (0x0); |
| samux |
2:27a7e7f8d399 | 622 | } |
| samux |
2:27a7e7f8d399 | 623 | _deselect(); |
| samux |
2:27a7e7f8d399 | 624 | return (0); |
| samux |
2:27a7e7f8d399 | 625 | } |
| samux |
2:27a7e7f8d399 | 626 | |
| samux |
2:27a7e7f8d399 | 627 | |
| samux |
2:27a7e7f8d399 | 628 | // For 1024 byte pages, we read just a single page, transfer half of it |
| samux |
2:27a7e7f8d399 | 629 | else if((_pagesize == 1024) || (_pagesize == 1056)) { |
| samux |
2:27a7e7f8d399 | 630 | int address = _getpaddr(block * 512); // This is the start address of the 512 byte block |
| samux |
2:27a7e7f8d399 | 631 | |
| samux |
2:27a7e7f8d399 | 632 | _pollbusy(); // Wait until First page has loaded into buffer 1 |
| samux |
2:27a7e7f8d399 | 633 | |
| samux |
2:27a7e7f8d399 | 634 | _flashread(1,address); // read the first page of the block into SRAM buffer 1 |
| samux |
2:27a7e7f8d399 | 635 | |
| samux |
2:27a7e7f8d399 | 636 | _pollbusy(); // Wait until First page has loaded into buffer 1 |
| samux |
2:27a7e7f8d399 | 637 | |
| samux |
2:27a7e7f8d399 | 638 | // Now the page has loaded, simply transfer it from the sram buffer to the data array |
| samux |
2:27a7e7f8d399 | 639 | // I'll do this directly as we are reading back an entire buffer, and this can be done more optimally |
| samux |
2:27a7e7f8d399 | 640 | // than using _sramread |
| samux |
2:27a7e7f8d399 | 641 | |
| samux |
2:27a7e7f8d399 | 642 | _select(); |
| samux |
2:27a7e7f8d399 | 643 | _spi.write(0xd4); |
| samux |
2:27a7e7f8d399 | 644 | |
| samux |
2:27a7e7f8d399 | 645 | if (block %2) { // odd numbered block, read from adress 0x200 |
| samux |
2:27a7e7f8d399 | 646 | _sendaddr (0x200); |
| samux |
2:27a7e7f8d399 | 647 | } |
| samux |
2:27a7e7f8d399 | 648 | else {// even numbered block, then we are reading from sram buffer 0x0 |
| samux |
2:27a7e7f8d399 | 649 | _sendaddr (0x0); |
| samux |
2:27a7e7f8d399 | 650 | } |
| samux |
2:27a7e7f8d399 | 651 | |
| samux |
2:27a7e7f8d399 | 652 | |
| samux |
2:27a7e7f8d399 | 653 | _spi.write (0x0); // dont care byte |
| samux |
2:27a7e7f8d399 | 654 | |
| samux |
2:27a7e7f8d399 | 655 | for(int i=0;i<512;i++) { |
| samux |
2:27a7e7f8d399 | 656 | data[i] = _spi.write (0x0); |
| samux |
2:27a7e7f8d399 | 657 | } |
| samux |
2:27a7e7f8d399 | 658 | _deselect(); |
| samux |
2:27a7e7f8d399 | 659 | return (0); |
| samux |
2:27a7e7f8d399 | 660 | } |
| samux |
2:27a7e7f8d399 | 661 | |
| samux |
2:27a7e7f8d399 | 662 | else { |
| samux |
2:27a7e7f8d399 | 663 | return (-1); // something isnt configured right |
| samux |
2:27a7e7f8d399 | 664 | } |
| samux |
2:27a7e7f8d399 | 665 | } |
| samux |
2:27a7e7f8d399 | 666 | |
| samux |
2:27a7e7f8d399 | 667 | |
| samux |
2:27a7e7f8d399 | 668 | |
| samux |
2:27a7e7f8d399 | 669 | |
| samux |
2:27a7e7f8d399 | 670 | |
| samux |
2:27a7e7f8d399 | 671 | /* |
| samux |
2:27a7e7f8d399 | 672 | * Write the buffer to the numbered block |
| samux |
2:27a7e7f8d399 | 673 | */ |
| samux |
2:27a7e7f8d399 | 674 | |
| samux |
2:27a7e7f8d399 | 675 | int AT45::blockwrite(char* data, int block) { |
| samux |
2:27a7e7f8d399 | 676 | |
| samux |
2:27a7e7f8d399 | 677 | // For 256 byte pages, we overwrite two pages |
| samux |
2:27a7e7f8d399 | 678 | if((_pagesize == 256) || (_pagesize == 264)) { |
| samux |
2:27a7e7f8d399 | 679 | |
| samux |
2:27a7e7f8d399 | 680 | // fill the first buffer with the first half of the block |
| samux |
2:27a7e7f8d399 | 681 | // do this directly, for better performance |
| samux |
2:27a7e7f8d399 | 682 | _select(); |
| samux |
2:27a7e7f8d399 | 683 | _spi.write(0x84); // writing to buffer #1 |
| samux |
2:27a7e7f8d399 | 684 | _sendaddr (0); // we are writing to the entire buffer |
| samux |
2:27a7e7f8d399 | 685 | |
| samux |
2:27a7e7f8d399 | 686 | for(int i=0;i<256;i++) { |
| samux |
2:27a7e7f8d399 | 687 | _spi.write (data[i]); |
| samux |
2:27a7e7f8d399 | 688 | } |
| samux |
2:27a7e7f8d399 | 689 | _deselect(); |
| samux |
2:27a7e7f8d399 | 690 | |
| samux |
2:27a7e7f8d399 | 691 | _flashwrite(1,(block*512)); |
| samux |
2:27a7e7f8d399 | 692 | |
| samux |
2:27a7e7f8d399 | 693 | // fill the buffer with the second half of the block |
| samux |
2:27a7e7f8d399 | 694 | // do this directly, for better performance |
| samux |
2:27a7e7f8d399 | 695 | _select(); |
| samux |
2:27a7e7f8d399 | 696 | _spi.write(0x84); // writing to buffer #1 |
| samux |
2:27a7e7f8d399 | 697 | _sendaddr (0); // we are writing to the entire buffer |
| samux |
2:27a7e7f8d399 | 698 | |
| samux |
2:27a7e7f8d399 | 699 | for(int i=0;i<256;i++) { |
| samux |
2:27a7e7f8d399 | 700 | _spi.write (data[256+i]); |
| samux |
2:27a7e7f8d399 | 701 | } |
| samux |
2:27a7e7f8d399 | 702 | _deselect(); |
| samux |
2:27a7e7f8d399 | 703 | |
| samux |
2:27a7e7f8d399 | 704 | _flashwrite(1,((block*512)+256)); |
| samux |
2:27a7e7f8d399 | 705 | } |
| samux |
2:27a7e7f8d399 | 706 | |
| samux |
2:27a7e7f8d399 | 707 | |
| samux |
2:27a7e7f8d399 | 708 | // For 512 byte pages, we overwrite a single page |
| samux |
2:27a7e7f8d399 | 709 | else if((_pagesize == 512) || (_pagesize == 528)) { |
| samux |
2:27a7e7f8d399 | 710 | |
| samux |
2:27a7e7f8d399 | 711 | // fill the first buffer with the block data |
| samux |
2:27a7e7f8d399 | 712 | // do this directly, for better performance |
| samux |
2:27a7e7f8d399 | 713 | _select(); |
| samux |
2:27a7e7f8d399 | 714 | _spi.write(0x84); // writing to buffer #1 |
| samux |
2:27a7e7f8d399 | 715 | _sendaddr (0); // we are writing to the entire buffer |
| samux |
2:27a7e7f8d399 | 716 | |
| samux |
2:27a7e7f8d399 | 717 | for(int i=0;i<512;i++) { |
| samux |
2:27a7e7f8d399 | 718 | _spi.write (data[i]); |
| samux |
2:27a7e7f8d399 | 719 | } |
| samux |
2:27a7e7f8d399 | 720 | _deselect(); |
| samux |
2:27a7e7f8d399 | 721 | |
| samux |
2:27a7e7f8d399 | 722 | _pollbusy(); // make sure the Flahs isnt busy |
| samux |
2:27a7e7f8d399 | 723 | |
| samux |
2:27a7e7f8d399 | 724 | // issue command to write buffer 1 to the appropraite flash page |
| samux |
2:27a7e7f8d399 | 725 | _select(); |
| samux |
2:27a7e7f8d399 | 726 | _spi.write (0x83); |
| samux |
2:27a7e7f8d399 | 727 | _sendaddr (_getpaddr(block * 512)); |
| samux |
2:27a7e7f8d399 | 728 | _deselect(); |
| samux |
2:27a7e7f8d399 | 729 | _pollbusy(); // make sure the Flahs isnt busy |
| samux |
2:27a7e7f8d399 | 730 | } |
| samux |
2:27a7e7f8d399 | 731 | |
| samux |
2:27a7e7f8d399 | 732 | |
| samux |
2:27a7e7f8d399 | 733 | // For 1024 byte pages, we do a read modify write |
| samux |
2:27a7e7f8d399 | 734 | // must make sure we overwrite the right half of the page! |
| samux |
2:27a7e7f8d399 | 735 | else if((_pagesize == 1024) || (_pagesize == 1056)) { |
| samux |
2:27a7e7f8d399 | 736 | |
| samux |
2:27a7e7f8d399 | 737 | _pollbusy(); // make sure the flash isnt busy |
| samux |
2:27a7e7f8d399 | 738 | |
| samux |
2:27a7e7f8d399 | 739 | int address = _getpaddr(block*512); |
| samux |
2:27a7e7f8d399 | 740 | |
| samux |
2:27a7e7f8d399 | 741 | // Read the page into sram |
| samux |
2:27a7e7f8d399 | 742 | _flashread(1,address); |
| samux |
2:27a7e7f8d399 | 743 | |
| samux |
2:27a7e7f8d399 | 744 | // wait for this operation to complete |
| samux |
2:27a7e7f8d399 | 745 | _pollbusy(); |
| samux |
2:27a7e7f8d399 | 746 | |
| samux |
2:27a7e7f8d399 | 747 | // Overwrite the appropriate half |
| samux |
2:27a7e7f8d399 | 748 | // do this directly, for better performance |
| samux |
2:27a7e7f8d399 | 749 | _select(); |
| samux |
2:27a7e7f8d399 | 750 | _spi.write(0x84); // writing to buffer #1 |
| samux |
2:27a7e7f8d399 | 751 | |
| samux |
2:27a7e7f8d399 | 752 | if(block%2) { // this is an odd block number, overwrite second half of buffer |
| samux |
2:27a7e7f8d399 | 753 | _sendaddr (0x200); // we are writing to the entire buffer |
| samux |
2:27a7e7f8d399 | 754 | } |
| samux |
2:27a7e7f8d399 | 755 | else { // this is an even block, overwrite the first half |
| samux |
2:27a7e7f8d399 | 756 | _sendaddr (0x0); // we are writing to the entire buffer |
| samux |
2:27a7e7f8d399 | 757 | } |
| samux |
2:27a7e7f8d399 | 758 | |
| samux |
2:27a7e7f8d399 | 759 | for(int i=0;i<512;i++) { |
| samux |
2:27a7e7f8d399 | 760 | _spi.write (data[i]); |
| samux |
2:27a7e7f8d399 | 761 | } |
| samux |
2:27a7e7f8d399 | 762 | _deselect(); |
| samux |
2:27a7e7f8d399 | 763 | |
| samux |
2:27a7e7f8d399 | 764 | // Write the page back |
| samux |
2:27a7e7f8d399 | 765 | _pollbusy(); |
| samux |
2:27a7e7f8d399 | 766 | _flashwrite(1,address); |
| samux |
2:27a7e7f8d399 | 767 | |
| samux |
2:27a7e7f8d399 | 768 | } |
| samux |
2:27a7e7f8d399 | 769 | |
| samux |
2:27a7e7f8d399 | 770 | |
| samux |
2:27a7e7f8d399 | 771 | // Something has gone wrong |
| samux |
2:27a7e7f8d399 | 772 | else { |
| samux |
2:27a7e7f8d399 | 773 | return (-1); |
| samux |
2:27a7e7f8d399 | 774 | } |
| samux |
2:27a7e7f8d399 | 775 | |
| samux |
2:27a7e7f8d399 | 776 | return (0); |
| samux |
2:27a7e7f8d399 | 777 | } |
| samux |
2:27a7e7f8d399 | 778 | |
| samux |
2:27a7e7f8d399 | 779 | |
| samux |
2:27a7e7f8d399 | 780 | /* |
| samux |
2:27a7e7f8d399 | 781 | * Return the number of 512 byte blocks in this device |
| samux |
2:27a7e7f8d399 | 782 | */ |
| samux |
2:27a7e7f8d399 | 783 | void blockerase (int block) {} |
| samux |
2:27a7e7f8d399 | 784 | |
| samux |
2:27a7e7f8d399 | 785 | |
| samux |
2:27a7e7f8d399 | 786 | |
| samux |
2:27a7e7f8d399 | 787 | /* |
| samux |
2:27a7e7f8d399 | 788 | * returns the number of buffer to use |
| samux |
2:27a7e7f8d399 | 789 | * If page is already open, use it |
| samux |
2:27a7e7f8d399 | 790 | * If one of the buffers is unused, use it |
| samux |
2:27a7e7f8d399 | 791 | * else evict the least recently used. |
| samux |
2:27a7e7f8d399 | 792 | |
| samux |
2:27a7e7f8d399 | 793 | */ |
| samux |
2:27a7e7f8d399 | 794 | int _allocatebuffer (int address) { |
| samux |
2:27a7e7f8d399 | 795 | |
| samux |
2:27a7e7f8d399 | 796 | int buf = 0; |
| samux |
2:27a7e7f8d399 | 797 | // is page already open in buffer 1? |
| samux |
2:27a7e7f8d399 | 798 | // is page already open in buffer 2 |
| samux |
2:27a7e7f8d399 | 799 | // is buffer 1 unusued? |
| samux |
2:27a7e7f8d399 | 800 | // is buffer 2 unused |
| samux |
2:27a7e7f8d399 | 801 | // evict LRU |
| samux |
2:27a7e7f8d399 | 802 | |
| samux |
2:27a7e7f8d399 | 803 | return (buf); |
| samux |
2:27a7e7f8d399 | 804 | |
| samux |
2:27a7e7f8d399 | 805 | } |
| samux |
2:27a7e7f8d399 | 806 | |
| samux |
2:27a7e7f8d399 | 807 | |
| samux |
2:27a7e7f8d399 | 808 | |
| samux |
2:27a7e7f8d399 | 809 | /* |
| samux |
2:27a7e7f8d399 | 810 | * write the buffer back to flash |
| samux |
2:27a7e7f8d399 | 811 | * set it as LRU |
| samux |
2:27a7e7f8d399 | 812 | * make _bufferNaddress = -1 |
| samux |
2:27a7e7f8d399 | 813 | */ |
| samux |
2:27a7e7f8d399 | 814 | void _flushbuffer (int buffer) { |
| samux |
2:27a7e7f8d399 | 815 | |
| samux |
2:27a7e7f8d399 | 816 | // is page already open in buffer 1? |
| samux |
2:27a7e7f8d399 | 817 | // is page already open in buffer 2 |
| samux |
2:27a7e7f8d399 | 818 | // is buffer 1 unusued? |
| samux |
2:27a7e7f8d399 | 819 | // is buffer 2 unused |
| samux |
2:27a7e7f8d399 | 820 | // evict LRU |
| samux |
2:27a7e7f8d399 | 821 | |
| samux |
2:27a7e7f8d399 | 822 | } |
| samux |
2:27a7e7f8d399 | 823 | |
| samux |
2:27a7e7f8d399 | 824 | |
| samux |
2:27a7e7f8d399 | 825 | |
| samux |
2:27a7e7f8d399 | 826 | |
| samux |
2:27a7e7f8d399 | 827 | |
| samux |
2:27a7e7f8d399 | 828 | |
| samux |
2:27a7e7f8d399 | 829 |