1               		.file	"dataflash.c"
   2               	__SREG__ = 0x3f
   3               	__SP_H__ = 0x3e
   4               	__SP_L__ = 0x3d
   5               	__CCP__  = 0x34
   6               	__tmp_reg__ = 0
   7               	__zero_reg__ = 1
   8               		.global __do_copy_data
   9               		.global __do_clear_bss
  11               		.text
  12               	.Ltext0:
  91               	.global	dataflash_init
  93               	dataflash_init:
   1:io/dataflash.c **** /*
   2:io/dataflash.c **** ,-----------------------------------------------------------------------------------------.
   3:io/dataflash.c **** | io/dataflash
   4:io/dataflash.c **** |-----------------------------------------------------------------------------------------
   5:io/dataflash.c **** | this file implements the driver for a Atmel Dataflash (AT45DB041B)
   6:io/dataflash.c **** | - 
   7:io/dataflash.c **** |
   8:io/dataflash.c **** | Author   : Simon Schulz / avr{AT}auctionant.de
   9:io/dataflash.c **** |
  10:io/dataflash.c **** | 
  11:io/dataflash.c **** |
  12:io/dataflash.c **** |-----------------------------------------------------------------------------------------
  13:io/dataflash.c **** | License:
  14:io/dataflash.c **** | This program is free software; you can redistribute it and/or modify it under
  15:io/dataflash.c **** | the terms of the GNU General Public License as published by the Free Software
  16:io/dataflash.c **** | Foundation; either version 2 of the License, or (at your option) any later
  17:io/dataflash.c **** | version.
  18:io/dataflash.c **** | This program is distributed in the hope that it will be useful, but
  19:io/dataflash.c **** |
  20:io/dataflash.c **** | WITHOUT ANY WARRANTY;
  21:io/dataflash.c **** |
  22:io/dataflash.c **** | without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  23:io/dataflash.c **** | PURPOSE. See the GNU General Public License for more details.
  24:io/dataflash.c **** |
  25:io/dataflash.c **** | You should have received a copy of the GNU General Public License along with
  26:io/dataflash.c **** | this program; if not, write to the Free Software Foundation, Inc., 51
  27:io/dataflash.c **** | Franklin St, Fifth Floor, Boston, MA 02110, USA
  28:io/dataflash.c **** |
  29:io/dataflash.c **** | http://www.gnu.de/gpl-ger.html
  30:io/dataflash.c **** `-----------------------------------------------------------------------------------------*/
  31:io/dataflash.c **** #include "dataflash.h"
  32:io/dataflash.c **** #include "main.h"
  33:io/dataflash.c **** #include <avr/delay.h>
  34:io/dataflash.c **** 
  35:io/dataflash.c **** //ACTIVATE DEBUG by editing this file:
  36:io/dataflash.c **** #include "debug.h"
  37:io/dataflash.c **** 
  38:io/dataflash.c **** 
  39:io/dataflash.c **** //initialise dataflash
  40:io/dataflash.c **** // -> SPI must be initialised externally!
  41:io/dataflash.c **** void dataflash_init(void){
  94               	bn	68,0,43,.LM1-.LFBB1
  95               	.LM1:
  96               		in r24,52-32
  97               		ori r24,lo8(96)
  98               		out 52-32,r24
  42:io/dataflash.c ****  |= (1<<DATAFLASH_PIN_CS) | (1<<DATAFLASH_PIN_RST);
  43:io/dataflash.c **** 	
  99               	bn	68,0,72,.LM2-.LFBB1
 100               	.LM2:
 101 0000 84B3      		cbi 53-32,5
 103 0004 84BB      	.LM3:
  44:io/dataflash.c **** if DATAFLASH_DEBUG
  45:io/dataflash.c **** 	softuart_puts_progmem("DF  : dataflash init: ");
  46:io/dataflash.c **** 	#endif
  47:io/dataflash.c **** 
  48:io/dataflash.c **** 	//SPI init (is done in enc28j60...
  49:io/dataflash.c **** 	#if 0 
  50:io/dataflash.c **** 		// initialize I/O
  51:io/dataflash.c **** 		//SPI init
  52:io/dataflash.c **** 		// initialize I/O
  53:io/dataflash.c **** 		PORTB |= (1<<7); //sck = hi
  54:io/dataflash.c **** 	
  55:io/dataflash.c **** 		//spi = output
  56:io/dataflash.c **** 		//mega8//DDRB |= (1<<2)|(1<<3)|(1<<5); //SS,MOSI,SCK = OUT
  57:io/dataflash.c **** 		DDRB |= (1<<4)|(1<<5)|(1<<7); //SS,MOSI,SCK = OUT
  58:io/dataflash.c **** 		DDRB &= ~(1<<6); //MISO = IN
  59:io/dataflash.c **** 	
  60:io/dataflash.c **** 		//SPI init:
  61:io/dataflash.c **** 		// - master mode
  62:io/dataflash.c **** 		// - positive clock phase
  63:io/dataflash.c **** 		// - msb first
  64:io/dataflash.c **** 		// - maximum SPI speed (fosc/2)
  65:io/dataflash.c **** 		// - enable spi
  66:io/dataflash.c **** 		SPCR = (0<<CPOL)|(1<<MSTR)|(0<<DORD)|(0<<SPR1)|(0<<SPR0)|(1<<SPE);
  67:io/dataflash.c **** 		SPSR = (1<<SPI2X);
  68:io/dataflash.c **** 	#endif
  69:io/dataflash.c **** 
  70:io/dataflash.c **** 	//reset dataflash:
  71:io/dataflash.c **** 	DATAFLASH_RESET_LO();
  72:io/dataflash.c **** 	DATAFLASH_CS_LO();
 104               	53-32,6
 105               		ldi r24,lo8(0)
 106 0006 AD98      	.L3:
  73:io/dataflash.c **** or(unsigned char i=0; i<20; i++)
 107               	B176:
 108               	.LBB177:
 109 0008 AE98      	.LBB178:
 111               	.LM4:
 112               		out 47-32,__zero_reg__
 113               	.L2:
  74:io/dataflash.c **** 	dataflash_spi_writeread_byte(0x00);
  75:io/dataflash.c **** 
  76:io/dataflash.c **** 	_delay_us(20); //min 10us
  77:io/dataflash.c **** 	DATAFLASH_CS_HI();
  78:io/dataflash.c **** 	_delay_us(1); //min 200ns		
  79:io/dataflash.c **** 	DATAFLASH_RESET_HI();
  80:io/dataflash.c **** 
  81:io/dataflash.c **** 	//dataflash is now in SPI Mode 3
  82:io/dataflash.c **** 	#if DATAFLASH_DEBUG
  83:io/dataflash.c **** 	softuart_puts_progmem("done.");
  84:io/dataflash.c **** 	softuart_putnewline();
  85:io/dataflash.c **** 	#endif
  86:io/dataflash.c **** }
  87:io/dataflash.c **** 
  88:io/dataflash.c **** void dataflash_dump(){
  89:io/dataflash.c **** 	for (int a=0; a<DATAFLASH_MAX_PAGE; a++){
  90:io/dataflash.c **** 		dataflash_copy_page_to_buffer(a, 0);
  91:io/dataflash.c **** 		for(int b=0; b<(256+8); b++){
  92:io/dataflash.c **** 			softuart_putc(dataflash_read_buffer(b,0));
  93:io/dataflash.c **** 		}
  94:io/dataflash.c **** 	}
  95:io/dataflash.c **** }
  96:io/dataflash.c **** 
  97:io/dataflash.c **** 
  98:io/dataflash.c **** //copy given buffer to flash page
  99:io/dataflash.c **** void dataflash_copy_buffer_to_page(unsigned int page, unsigned char buffer){
 100:io/dataflash.c **** 	//wait for device ready
 101:io/dataflash.c **** 	dataflash_busy_wait();
 102:io/dataflash.c **** 
 103:io/dataflash.c **** 	//select device again:
 104:io/dataflash.c **** 	DATAFLASH_CS_LO();
 105:io/dataflash.c **** 
 106:io/dataflash.c **** 	//send buffer select cmd:
 107:io/dataflash.c **** 	if (buffer == 0)
 108:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_BUFFER0_TO_MEM_WE);
 109:io/dataflash.c **** 	else
 110:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_BUFFER1_TO_MEM_WE);
 111:io/dataflash.c **** 
 112:io/dataflash.c **** 	//send 0000 0ppp pppp pppp 
 113:io/dataflash.c **** 	dataflash_spi_writeread_byte((page>>7)&0x0F);
 114:io/dataflash.c **** 	dataflash_spi_writeread_byte((page<<1)&0xFE);
 115:io/dataflash.c **** 
 116:io/dataflash.c **** 	//send 8 dont care bits:
 117:io/dataflash.c **** 	dataflash_spi_writeread_byte(0x00);
 118:io/dataflash.c **** 
 119:io/dataflash.c **** 	DATAFLASH_CS_HI();
 120:io/dataflash.c **** }
 121:io/dataflash.c **** 
 122:io/dataflash.c **** //write len bytes to given page buffer starting at <byte> 
 123:io/dataflash.c **** void dataflash_write_n_to_page_buffer(unsigned int byte, unsigned char buffer, unsigned char *data,
 124:io/dataflash.c **** 	//wait for device ready
 125:io/dataflash.c **** 	dataflash_busy_wait();
 126:io/dataflash.c **** 
 127:io/dataflash.c **** 	//select device again:
 128:io/dataflash.c **** 	DATAFLASH_CS_LO();
 129:io/dataflash.c **** 
 130:io/dataflash.c **** 	//send buffer select cmd:
 131:io/dataflash.c **** 	if (buffer == 0)
 132:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_WRITE_BUFFER0);
 133:io/dataflash.c **** 	else
 134:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_WRITE_BUFFER1);
 135:io/dataflash.c **** 
 136:io/dataflash.c **** 	//15 dont care + 9 adress bits:
 137:io/dataflash.c **** 	
 138:io/dataflash.c **** 	//send 8 dont care bits:
 139:io/dataflash.c **** 	dataflash_spi_writeread_byte(0x00);
 140:io/dataflash.c **** 	
 141:io/dataflash.c **** 	//send 0000 000b bbbb bbbb
 142:io/dataflash.c **** 	dataflash_spi_writeread_byte((byte>>8)&0x01);
 143:io/dataflash.c **** 	dataflash_spi_writeread_byte((byte)&0xFF);
 144:io/dataflash.c **** 
 145:io/dataflash.c **** 	//send data
 146:io/dataflash.c **** 	while(len>0){
 147:io/dataflash.c **** 		dataflash_spi_writeread_byte((*data));
 148:io/dataflash.c **** 		*data++;
 149:io/dataflash.c **** 		len--;
 150:io/dataflash.c **** 	}
 151:io/dataflash.c **** 
 152:io/dataflash.c **** 	//deselect device:
 153:io/dataflash.c **** 	DATAFLASH_CS_HI();
 154:io/dataflash.c **** }
 155:io/dataflash.c **** 
 156:io/dataflash.c **** 
 157:io/dataflash.c **** //write one byte to given page buffer
 158:io/dataflash.c **** void dataflash_write_to_page_buffer(unsigned int byte, unsigned char buffer, unsigned char data){
 159:io/dataflash.c **** 	//wait for device ready
 160:io/dataflash.c **** 	dataflash_busy_wait();
 161:io/dataflash.c **** 
 162:io/dataflash.c **** 	//select device again:
 163:io/dataflash.c **** 	DATAFLASH_CS_LO();
 164:io/dataflash.c **** 
 165:io/dataflash.c **** 	//send buffer select cmd:
 166:io/dataflash.c **** 	if (buffer == 0)
 167:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_WRITE_BUFFER0);
 168:io/dataflash.c **** 	else
 169:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_WRITE_BUFFER1);
 170:io/dataflash.c **** 
 171:io/dataflash.c **** 	//15 dont care + 9 adress bits:
 172:io/dataflash.c **** 	
 173:io/dataflash.c **** 	//send 8 dont care bits:
 174:io/dataflash.c **** 	dataflash_spi_writeread_byte(0x00);
 175:io/dataflash.c **** 	
 176:io/dataflash.c **** 	//send 0000 000b bbbb bbbb
 177:io/dataflash.c **** 	dataflash_spi_writeread_byte((byte>>8)&0x01);
 178:io/dataflash.c **** 	dataflash_spi_writeread_byte((byte)&0xFF);
 179:io/dataflash.c **** 
 180:io/dataflash.c **** 	//send data
 181:io/dataflash.c **** 	dataflash_spi_writeread_byte(data);
 182:io/dataflash.c **** 
 183:io/dataflash.c **** 	//deselect device:
 184:io/dataflash.c **** 	DATAFLASH_CS_HI();
 185:io/dataflash.c **** }
 186:io/dataflash.c **** 
 187:io/dataflash.c **** //copy flash page to given buffer
 188:io/dataflash.c **** void dataflash_copy_page_to_buffer(unsigned int page, unsigned char buffer){
 189:io/dataflash.c **** 	//wait for device ready
 190:io/dataflash.c **** 	dataflash_busy_wait();
 191:io/dataflash.c **** 
 192:io/dataflash.c **** 	//select device again:
 193:io/dataflash.c **** 	DATAFLASH_CS_LO();
 194:io/dataflash.c **** 
 195:io/dataflash.c **** 	//send buffer select cmd:
 196:io/dataflash.c **** 	if (buffer == 0)
 197:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_MEM_TO_BUFFER0);
 198:io/dataflash.c **** 	else
 199:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_MEM_TO_BUFFER1);
 200:io/dataflash.c **** 
 201:io/dataflash.c **** 	//send 0000 pppp pppp ppp0 
 202:io/dataflash.c **** 	dataflash_spi_writeread_byte((page>>7)&0x0F);
 203:io/dataflash.c **** 	dataflash_spi_writeread_byte((page<<1)&0xFE);
 204:io/dataflash.c **** 
 205:io/dataflash.c **** 	//send 8 dont care bits:
 206:io/dataflash.c **** 	dataflash_spi_writeread_byte(0x00);
 207:io/dataflash.c **** 
 208:io/dataflash.c **** 	DATAFLASH_CS_HI();
 209:io/dataflash.c **** }
 210:io/dataflash.c **** 
 211:io/dataflash.c **** //read one byte from buffer
 212:io/dataflash.c **** unsigned char dataflash_read_buffer(unsigned int byte, unsigned char buffer){
 213:io/dataflash.c **** 	unsigned char data;
 214:io/dataflash.c **** 
 215:io/dataflash.c **** 	//wait for device ready
 216:io/dataflash.c **** 	dataflash_busy_wait();
 217:io/dataflash.c **** 
 218:io/dataflash.c **** 	//select device again:
 219:io/dataflash.c **** 	DATAFLASH_CS_LO();
 220:io/dataflash.c **** 
 221:io/dataflash.c **** 	//send buffer select cmd:
 222:io/dataflash.c **** 	if (buffer == 0)
 223:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_READ_BUFFER0);
 224:io/dataflash.c **** 	else
 225:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_READ_BUFFER1);
 226:io/dataflash.c **** 
 227:io/dataflash.c **** 	//15 dont care + 9 address + 8 dont care:
 228:io/dataflash.c **** 
 229:io/dataflash.c **** 	//send address: 0000 0000 0000 000b bbbb bbbb 
 230:io/dataflash.c **** 	dataflash_spi_writeread_byte(0x00);
 231:io/dataflash.c **** 	dataflash_spi_writeread_byte((byte>>8)&0x01);
 232:io/dataflash.c **** 	dataflash_spi_writeread_byte((byte)&0xFF);
 233:io/dataflash.c **** 
 234:io/dataflash.c **** 	//send one dummy byte
 235:io/dataflash.c **** 	dataflash_spi_writeread_byte(0x00);
 236:io/dataflash.c **** 
 237:io/dataflash.c **** 	//now read the data
 238:io/dataflash.c **** 	data = dataflash_spi_writeread_byte(0x00);
 239:io/dataflash.c **** 
 240:io/dataflash.c **** 	//deselect device
 241:io/dataflash.c **** 	DATAFLASH_CS_HI();
 242:io/dataflash.c **** 
 243:io/dataflash.c **** 	//return data
 244:io/dataflash.c **** 	return (data);
 245:io/dataflash.c **** }
 246:io/dataflash.c **** 
 247:io/dataflash.c **** //read n byte from buffer
 248:io/dataflash.c **** void dataflash_read_n_to_buffer(unsigned char *buffer, unsigned char selbuf){
 249:io/dataflash.c **** 	//wait for device ready
 250:io/dataflash.c **** 	dataflash_busy_wait();
 251:io/dataflash.c **** 
 252:io/dataflash.c **** 	//select device again:
 253:io/dataflash.c **** 	DATAFLASH_CS_LO();
 254:io/dataflash.c **** 
 255:io/dataflash.c **** 	//send buffer select cmd:
 256:io/dataflash.c **** 	if (selbuf == 0)
 257:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_READ_BUFFER0);
 258:io/dataflash.c **** 	else
 259:io/dataflash.c **** 		dataflash_spi_writeread_byte(DATAFLASH_READ_BUFFER1);
 260:io/dataflash.c **** 
 261:io/dataflash.c **** 	//15 dont care + 9 address + 8 dont care:
 262:io/dataflash.c **** 
 263:io/dataflash.c **** 	//send address: 0000 0000 0000 000b bbbb bbbb 
 264:io/dataflash.c **** 	dataflash_spi_writeread_byte(0x00);
 265:io/dataflash.c **** 	dataflash_spi_writeread_byte(0);//start with first byte
 266:io/dataflash.c **** 	dataflash_spi_writeread_byte(0);
 267:io/dataflash.c **** 
 268:io/dataflash.c **** 	//send one dummy byte
 269:io/dataflash.c **** 	dataflash_spi_writeread_byte(0x00);
 270:io/dataflash.c **** 
 271:io/dataflash.c **** 	//now read the data
 272:io/dataflash.c **** 	*buffer++ = dataflash_spi_writeread_byte(0x00);
 273:io/dataflash.c **** 	for(unsigned char c=0; c<255; c++){
 274:io/dataflash.c **** 		*buffer++ = dataflash_spi_writeread_byte(0x00);
 275:io/dataflash.c **** 	}
 276:io/dataflash.c **** 
 277:io/dataflash.c **** 	//deselect device
 278:io/dataflash.c **** 	DATAFLASH_CS_HI();
 279:io/dataflash.c **** }
 280:io/dataflash.c **** 
 281:io/dataflash.c **** 
 282:io/dataflash.c **** //read 1 byte directly from flash:
 283:io/dataflash.c **** unsigned char dataflash_read_flash(unsigned int page, unsigned int byte){
 284:io/dataflash.c **** 	unsigned char data;
 285:io/dataflash.c **** 
 286:io/dataflash.c **** 	//wait for device ready
 287:io/dataflash.c **** 	dataflash_busy_wait();
 288:io/dataflash.c ****