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29 * Copyright 2007 Develer S.r.l. (http://www.develer.com/)
33 * \brief Function library for AT45DB081D Flash memory.
36 * \version $Id: dflash.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/dflash.h>
54 * Send a generic command to data flash memory.
55 * This function send only 4 byte, for opcode, page address and
58 static void send_cmd(dflashAddr_t page_addr, dflashAddr_t byte_addr, DFlashOpcode opcode)
62 * Make sure to toggle CS signal in order,
63 * and reset dflash command decoder.
71 * To send one command to data flash memory, we send 4 byte.
72 * First byte is opcode command, second and third byte are
73 * page address, in last byte we write a byte page address.
74 * (see datasheet for more detail).
76 * \note Generaly a defaul memory page size is more than 256 byte.
77 * In this case we need for addressing a byte in one page more than
78 * 8 bit, so we put in fourth byte low part of address byte, and
79 * hight part of address byte in third byte togheter low par of page
94 spi_sendRecv((uint8_t)(page_addr >> (16 - DFLASH_PAGE_ADDRESS_BIT)));
95 spi_sendRecv((uint8_t)((page_addr << (DFLASH_PAGE_ADDRESS_BIT - 8)) + (byte_addr >> 8)));
99 * Send byte page address.
101 spi_sendRecv((uint8_t)byte_addr);
108 //TODO: deve ritornare un bool?
110 * Init data flash memory interface.
112 void dflash_init(struct _KFile *fd)
114 // Set up data flash programming functions.
115 fd->open = dflash_open;
116 fd->close = dflash_close;
117 fd->read = dflash_read;
118 fd->write = dflash_write;
119 fd->seek = dflash_seek;
121 // Init data flash memory and micro pin.
127 * Reset dataflash memory function.
129 * This function reset data flash memory
130 * with one pulse reset long about 10usec.
133 void dflash_reset(void)
137 timer_delayHp(us_to_hptime(RESET_PULSE_WIDTH));
140 timer_delayHp(us_to_hptime(RESET_PULSE_WIDTH));
144 * dflash init function.
145 * This function initialize a micro pin and
146 * SPI driver, and test if data flash memory
147 * density is the same wich define in dflash.h.
150 static bool dflash_pin_init(void)
157 WRITE_ENABLE(); //pilot wp pin.
164 stat = dflash_stat();
169 * 2,3,4,5 bit of 1 byte status register
170 * indicate a device density of dflash memory
171 * (see datasheet for more detail.)
173 GET_ID_DESITY_DEVICE(stat);
175 if(stat == DFLASH_ID_DEVICE_DENSITY)
184 * Read status register of dataflah memory.
187 static uint8_t dflash_stat(void)
192 * Make sure to toggle CS signal in order,
193 * and reset dflash command decoder.
200 stat = spi_sendRecv(DFO_READ_STATUS);
201 stat = spi_sendRecv(0x00);
208 * Send one command to data flash memory, and
209 * return status register value.
212 static uint8_t dflash_cmd(dflashAddr_t page_addr, dflashAddr_t byte_addr, DFlashOpcode opcode)
215 send_cmd(page_addr, byte_addr, opcode);
221 * We chech data flash memory state, and wait until busy-flag
224 while(!(dflash_stat() & BUSY_BIT));
226 return (dflash_stat());
231 * Read one byte from main data flash memory or buffer data
234 static uint8_t dflash_read_byte(dflashAddr_t page_addr, dflashAddr_t byte_addr, DFlashOpcode opcode)
238 send_cmd(page_addr, byte_addr, opcode);
240 #if CONFIG_DATA_FLASH == AT45DB041B
241 if(opcode == DFO_READ_FLASH_MEM_BYTE)
244 * Send 24 don't care bit.
255 spi_sendRecv(0x00); //Send 8 don't care bit.
256 data = spi_sendRecv(0x00); //Read byte.
263 * Read \param len bytes from main data flash memory or buffer data
264 * flash memory, and put it in \param *block.
266 static void dflash_read_block(dflashAddr_t page_addr, dflashAddr_t byte_addr, DFlashOpcode opcode, uint8_t *block, dflashSize_t len)
269 send_cmd(page_addr, byte_addr, opcode);
271 if(opcode == DFO_READ_FLASH_MEM_BYTE)
274 * Send 24 don't care bit.
283 spi_sendRecv(0x00); //Send 8 don't care bit.
284 spi_read(block, len); //Read len bytes ad put in block buffer.
292 * Write one byte in buffer buffer data flash memory.
294 * \note Isn't possible to write byte directly in main memory data
295 * flash. To perform write in main memory you must before write in buffer
296 * data flash memory, an then send command to write page in main memory.
298 static void dflash_write_byte(dflashAddr_t byte_addr, DFlashOpcode opcode, uint8_t data)
300 send_cmd(0x00, byte_addr, opcode);
302 spi_sendRecv(data); //Write data byte.
308 * Write \param len bytes in buffer buffer data flash memory.
310 * \note Isn't possible to write bytes directly in main memory data
311 * flash. To perform write in main memory you must before write in buffer
312 * data flash memory, an then send command to write page in main memory.
314 static void dflash_write_block(dflashAddr_t byte_addr, DFlashOpcode opcode, uint8_t *block, dflashSize_t len)
318 send_cmd(0x00, byte_addr, opcode);
320 spi_write(block, len); //Write len bytes.