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29 * Copyright 2007 Develer S.r.l. (http://www.develer.com/)
33 * \brief Function library for AT45DBXX Data Flash memory.
36 * \version $Id: dataflash.c 15379 2007-03-28 15:46:09Z asterix $
37 * \author Daniele Basile <asterix@develer.com>
41 #include <appconfig.h>
44 #include <cfg/macros.h>
45 #include <cfg/debug.h>
46 #include <cfg/module.h>
47 #include <drv/timer.h>
49 #include <drv/dataflash.h>
55 * Global variable for store current and previous data
56 * flash memory page address during operation of writing.
58 static dataflash_t previous_page = 0;
59 static bool page_modified = false;
63 * Send a generic command to data flash memory.
64 * This function send only 4 byte, for opcode, page address and
67 static void send_cmd(dataflash_t page_addr, dataflashOffset_t byte_addr, DataFlashOpcode opcode)
71 * Make sure to toggle CS signal in order,
72 * and reset dataflash command decoder.
74 * \note This is equivalent to CS_DISABLE() immediately followed by CS_ENABLE()
80 * To send one command to data flash memory, we send 4 byte.
81 * First byte is opcode command, second and third byte are
82 * page address, in last byte we write a byte page address.
83 * (see datasheet for more detail).
85 * \note Generaly a defaul memory page size is more than 256 byte.
86 * In this case we need for addressing a byte in one page more than
87 * 8 bit, so we put in fourth byte low part of address byte, and
88 * hight part of address byte in third byte togheter low par of page
101 spi_sendRecv((uint8_t)(page_addr >> (16 - DATAFLASH_PAGE_ADDRESS_BIT)));
102 spi_sendRecv((uint8_t)((page_addr << (DATAFLASH_PAGE_ADDRESS_BIT - 8)) + (byte_addr >> 8)));
105 * Send byte page address.
107 spi_sendRecv((uint8_t)byte_addr);
113 * Reset dataflash memory function.
115 * This function reset data flash memory
116 * with one pulse reset long about 10usec.
119 static void dataflash_reset(void)
123 timer_delayHp(us_to_hptime(RESET_PULSE_WIDTH));
126 timer_delayHp(us_to_hptime(RESET_PULSE_WIDTH));
130 * dataflash init function.
131 * This function initialize a micro pin and
132 * SPI driver, and test if data flash memory
133 * density is the same wich define in dataflash.h.
135 MOD_DEFINE(dataflash);
136 static bool dataflash_pin_init(void)
143 WRITE_ENABLE(); //pilot wp pin.
150 stat = dataflash_stat();
155 * 2,3,4,5 bits of 1 byte status register
156 * indicate a device density of dataflash memory
157 * (see datasheet for more detail.)
159 GET_ID_DESITY_DEVICE(stat);
161 if(stat == DATAFLASH_ID_DEVICE_DENSITY)
170 * Read status register of dataflah memory.
173 static uint8_t dataflash_stat(void)
178 * Make sure to toggle CS signal in order,
179 * and reset dataflash command decoder.
183 stat = spi_sendRecv(DFO_READ_STATUS);
184 stat = spi_sendRecv(0x00);
187 * Note: this function could be call one more time
188 * to check register status (es. check if memory has been
189 * teminate one operation), and so we don't disable CS to
190 * allow fast reading of register status.
197 * Send one command to data flash memory, and
198 * return status register value.
201 static uint8_t dataflash_cmd(dataflash_t page_addr, dataflashOffset_t byte_addr, DataFlashOpcode opcode)
206 send_cmd(page_addr, byte_addr, opcode);
211 * We chech data flash memory state, and wait until busy-flag
214 while(!(dataflash_stat() & BUSY_BIT));
216 stat = dataflash_stat();
219 * Data flash has been terminate a sent command, and so
229 * Read one byte from main data flash memory or buffer data
232 static uint8_t dataflash_read_byte(dataflash_t page_addr, dataflashOffset_t byte_addr, DataFlashOpcode opcode)
236 send_cmd(page_addr, byte_addr, opcode);
238 #if CONFIG_DATA_FLASH == DATAFLASH_AT45DB041B
239 if(opcode == DFO_READ_FLASH_MEM_BYTE)
242 * Send 24 don't care bit.
251 spi_sendRecv(0x00); //Send 8 don't care bit.
252 data = spi_sendRecv(0x00); //Read byte.
260 * Read \a len bytes from main data flash memory or buffer data
261 * flash memory, and put it in \a *block.
263 static void dataflash_read_block(dataflash_t page_addr, dataflashOffset_t byte_addr, DataFlashOpcode opcode, uint8_t *block, dataflashSize_t len)
266 send_cmd(page_addr, byte_addr, opcode);
268 if(opcode == DFO_READ_FLASH_MEM_BYTE)
271 * Send 24 don't care bit.
279 spi_sendRecv(0x00); //Send 8 don't care bit.
280 spi_read(block, len); //Read len bytes ad put in block buffer.
289 * Write \a len bytes in buffer buffer data flash memory.
291 * \note Isn't possible to write bytes directly in main memory data
292 * flash. To perform write in main memory you must before write in buffer
293 * data flash memory, an then send command to write page in main memory.
295 static void dataflash_write_block(dataflashOffset_t byte_addr, DataFlashOpcode opcode, uint8_t *block, dataflashSize_t len)
298 send_cmd(0x00, byte_addr, opcode);
300 spi_write(block, len); //Write len bytes.
308 * Load selct page from dataflash memory to buffer.
310 static void dataflash_loadPage(dataflash_t page_addr)
312 dataflash_cmd(page_addr, 0x00, DFO_MOV_MEM_TO_BUFF1);
316 * Flush select page (stored in buffer) in data flash main memory page.
318 void dataflash_flush(void)
322 dataflash_cmd(previous_page, 0x00, DFO_WRITE_BUFF1_TO_MEM_E);
324 page_modified = false;
326 kprintf("\n::=> Flush page:... <%ld>\n", previous_page);
330 /* Kfile interface section */
333 * Open data flash file \a fd
334 * \a name and \a mode are unused, cause flash memory is
335 * threated like one file.
337 static bool dataflash_open(struct _KFile *fd, UNUSED_ARG(const char *, name), UNUSED_ARG(int, mode))
339 MOD_CHECK(dataflash);
343 fd->size = (dataflashAddr_t)DATAFLASH_PAGE_SIZE * (dataflashAddr_t)DATAFLASH_NUM_PAGE;
345 /* Load select page memory from data flash memory*/
346 dataflash_loadPage(previous_page);
348 kprintf("dataflash file opened\n");
355 static bool dataflash_close(UNUSED_ARG(struct _KFile *,fd))
358 kprintf("dataflash file closed\n");
363 * Move \a fd file seek position of \a offset bytes
364 * from current position.
366 static int32_t dataflash_seek(struct _KFile *fd, int32_t offset, KSeekMode whence)
376 seek_pos = fd->size - 1;
379 seek_pos = fd->seek_pos;
388 if (seek_pos + offset > fd->size)
394 fd->seek_pos = seek_pos + offset;
395 kprintf("Flash seek to [%u]\n", fd->seek_pos);
401 * Read from file \a fd \a size bytes and put it in buffer \a buf
402 * \return the number of bytes read.
404 static size_t dataflash_read(struct _KFile *fd, void *buf, size_t size)
406 dataflashOffset_t byte_addr;
407 dataflashAddr_t page_addr;
408 uin8_t *data = (uint8_t *)buf;
411 ASSERT(fd->seek_pos + size <= fd->size);
412 size = MIN((uint32_t)size, fd->size - fd->seek_pos);
414 kprintf("Reading at pos[%u]\n", fd->seek_pos);
417 * We select from absolute address page address
418 * and byte address in page.
420 page_addr = fd->seek_pos / (dataflashAddr_t)DATAFLASH_PAGE_SIZE;
421 byte_addr = fd->seek_pos % (dataflashAddr_t)DATAFLASH_PAGE_SIZE;
424 kprintf(" [page-<%ld>, byte-<%ld>]", page_addr, byte_addr);
427 * Flush current page in main memory if
428 * we had been written a byte in memory
433 * Read byte in main page data flash memory.
435 dataflash_read_block(page_addr, byte_addr, DFO_READ_FLASH_MEM_BYTE, data, size);
437 fd->seek_pos += size;
438 kprintf(" ::=> Read data: %02x\n",data);
444 * Write program memory.
445 * Write \a size bytes from buffer \a _buf to file \a fd
446 * \note Write operations are buffered.
448 static size_t dataflash_write(struct _KFile *fd, const void *_buf, size_t size)
451 dataflashOffset_t byte_addr;
452 dataflashAddr_t current_page;
454 uint8_t *data = (uint8_t *) _buf;
456 ASSERT(fd->seek_pos + size <= fd->size);
457 size = MIN((uint32_t)size, fd->size - fd->seek_pos);
459 kprintf("Writing at pos[%u]\n", fd->seek_pos);
464 * We select from absolute address page address
465 * and byte address in page.
467 current_page = fd->seek_pos / (dataflashAddr_t)DATAFLASH_PAGE_SIZE;
468 byte_addr = fd->seek_pos % (dataflashAddr_t)DATAFLASH_PAGE_SIZE;
471 size_t wr_len = MIN(size, DATAFLASH_PAGE_SIZE - byte_addr);
473 kprintf(" [page-<%ld>, byte-<%ld>]",current_page, byte_addr);
475 if (current_page != previous_page)
477 /* Flush current page in main memory*/
479 /* Load select page memory from data flash memory*/
480 dataflash_loadPage(current_page);
482 previous_page = current_page;
483 kprintf(" >> Load page: <%ld> ",current_page);
486 * Write byte in current page, and set true
487 * page_modified flag.
489 dataflash_write_byte(byte_addr, DFO_WRITE_BUFF1, data);
490 page_modified = true;
494 fd->seek_pos += wr_len;
496 total_write += wr_len;
499 kprintf("written %u bytes\n", total_write);
504 * Init data flash memory interface.
506 void dataflash_init(struct _KFile *fd)
508 // Set up data flash programming functions.
509 fd->open = dataflash_open;
510 fd->close = dataflash_close;
511 fd->read = dataflash_read;
512 fd->write = dataflash_write;
513 fd->seek = dataflash_seek;
515 // Init data flash memory and micro pin.
516 ASSERT(dataflash_pin_init());
520 * Test function for dataflash.
522 * This function test check low level driver for
523 * AT45xx (see dataflash.h for more info) data flash memory.
524 * We write a string in memory in some page ad read it.
526 void dataflash_test(void)
532 uint8_t test_buf[] = "0123456789 Develer s.r.l.";
535 kprintf("\n======= Data Flash test function =========================================\n");
536 kprintf("\nThe string test is: %s\n\n", test_buf);
538 fd.open(&fd, NULL, 0);
543 if (fd.seek(&fd, 0, SEEK_SET) != 0)
544 goto dataflash_test_end;
546 // Test flash write to address 0 (page 0)
547 if (!fd->write(&fd, test_buf, sizeof(test_buf)))
548 goto dataflash_test_end;
551 if (fd.seek(&fd, 0, SEEK_SET) != 0)
552 goto dataflash_test_end;
554 // Test flash read to address 0 (page 0)
555 if (!fd->read(&fd, cmp_buf, sizeof(test_buf)))
556 goto dataflash_test_end;
558 // Compare if are egual.
559 if ((memcmp(cmp_buf,test_buf, sizeof(test_buf)) == 0)
560 goto dataflash_test_end;
564 // Go to middle address memory.
565 fd.seek(&fd, (((dataflashAddr_t)DFLASH_PAGE_SIZE * (dataflashAddr_t)DFLASH_NUM_PAGE) / 2), SEEK_CUR);
567 // Test flash write at the middle of memory
568 if (!fd->write(&fd, test_buf, sizeof(test_buf)))
569 goto dataflash_test_end;
571 // Go to middle address memory.
572 fd.seek(&fd, (((dataflashAddr_t)DFLASH_PAGE_SIZE * (dataflashAddr_t)DFLASH_NUM_PAGE) / 2), SEEK_CUR);
574 // Test flash read at the middle of memory
575 if (!fd->read(&fd, cmp_buf, sizeof(test_buf)))
576 goto dataflash_test_end;
578 // Compare if are egual.
579 if ((memcmp(cmp_buf,test_buf, sizeof(test_buf)) == 0)
580 goto dataflash_test_end;
584 // Go to end of data flash.
585 fd.seek(&fd, ((dataflashAddr_t)DFLASH_PAGE_SIZE * (dataflashAddr_t)DFLASH_NUM_PAGE) - sizeof(test_buf), SEEK_END);
587 // Test flash write at the end of memory
588 if (!fd->write(&fd, test_buf, sizeof(test_buf)))
589 goto dataflash_test_end;
591 // Go to end of data flash.
592 fd.seek(&fd, ((dataflashAddr_t)DFLASH_PAGE_SIZE * (dataflashAddr_t)DFLASH_NUM_PAGE) - sizeof(test_buf), SEEK_END);
594 // Test flash read at the end of memory
595 if (!fd->read(&fd, cmp_buf, sizeof(test_buf)))
596 goto dataflash_test_end;
598 // Compare if are egual.
599 if ((memcmp(cmp_buf,test_buf, sizeof(test_buf)) == 0)
600 goto dataflash_test_end;
604 kprintf("\n====== Test end ===========================================================\n");