GAS LISTING /tmp/ccfEG7oP.s page 1 1 .file "I2CInterface.c" 2 __SREG__ = 0x3f 3 __SP_H__ = 0x3e 4 __SP_L__ = 0x3d 5 __tmp_reg__ = 0 6 __zero_reg__ = 1 7 .global __do_copy_data 8 .global __do_clear_bss 9 .stabs "/home/kaklik/projects/programy/C/avr/AVRcam/",100,0,2,.Ltext0 10 .stabs "I2CInterface.c",100,0,2,.Ltext0 11 .text 12 .Ltext0: 13 .stabs "gcc2_compiled.",60,0,0,0 14 .stabs "int:t(0,1)=r(0,1);-32768;32767;",128,0,0,0 15 .stabs "char:t(0,2)=@s8;r(0,2);0;255;",128,0,0,0 16 .stabs "long int:t(0,3)=@s32;r(0,3);020000000000;017777777777;",128,0,0,0 17 .stabs "unsigned int:t(0,4)=r(0,4);0;0177777;",128,0,0,0 18 .stabs "long unsigned int:t(0,5)=@s32;r(0,5);0;037777777777;",128,0,0,0 19 .stabs "long long int:t(0,6)=@s64;r(0,6);01000000000000000000000;0777777777777777777777;",128,0,0, 20 .stabs "long long unsigned int:t(0,7)=@s64;r(0,7);0;01777777777777777777777;",128,0,0,0 21 .stabs "short int:t(0,8)=r(0,8);-32768;32767;",128,0,0,0 22 .stabs "short unsigned int:t(0,9)=r(0,9);0;0177777;",128,0,0,0 23 .stabs "signed char:t(0,10)=@s8;r(0,10);-128;127;",128,0,0,0 24 .stabs "unsigned char:t(0,11)=@s8;r(0,11);0;255;",128,0,0,0 25 .stabs "float:t(0,12)=r(0,1);4;0;",128,0,0,0 26 .stabs "double:t(0,13)=r(0,1);4;0;",128,0,0,0 27 .stabs "long double:t(0,14)=r(0,1);4;0;",128,0,0,0 28 .stabs "void:t(0,15)=(0,15)",128,0,0,0 29 .stabs "/usr/lib/gcc/avr/4.2.1/../../../../avr/include/avr/io.h",130,0,0,0 30 .stabs "/usr/lib/gcc/avr/4.2.1/../../../../avr/include/avr/sfr_defs.h",130,0,0,0 31 .stabs "/usr/lib/gcc/avr/4.2.1/../../../../avr/include/inttypes.h",130,0,0,0 32 .stabs "/usr/lib/gcc/avr/4.2.1/../../../../avr/include/stdint.h",130,0,0,0 33 .stabs "int8_t:t(4,1)=(0,10)",128,0,116,0 34 .stabs "uint8_t:t(4,2)=(0,11)",128,0,117,0 35 .stabs "int16_t:t(4,3)=(0,1)",128,0,118,0 36 .stabs "uint16_t:t(4,4)=(0,4)",128,0,119,0 37 .stabs "int32_t:t(4,5)=(0,3)",128,0,120,0 38 .stabs "uint32_t:t(4,6)=(0,5)",128,0,121,0 39 .stabs "int64_t:t(4,7)=(0,6)",128,0,122,0 40 .stabs "uint64_t:t(4,8)=(0,7)",128,0,123,0 41 .stabs "intptr_t:t(4,9)=(4,3)",128,0,135,0 42 .stabs "uintptr_t:t(4,10)=(4,4)",128,0,140,0 43 .stabs "int_least8_t:t(4,11)=(4,1)",128,0,152,0 44 .stabs "uint_least8_t:t(4,12)=(4,2)",128,0,157,0 45 .stabs "int_least16_t:t(4,13)=(4,3)",128,0,162,0 46 .stabs "uint_least16_t:t(4,14)=(4,4)",128,0,167,0 47 .stabs "int_least32_t:t(4,15)=(4,5)",128,0,172,0 48 .stabs "uint_least32_t:t(4,16)=(4,6)",128,0,177,0 49 .stabs "int_least64_t:t(4,17)=(4,7)",128,0,182,0 50 .stabs "uint_least64_t:t(4,18)=(4,8)",128,0,187,0 51 .stabs "int_fast8_t:t(4,19)=(4,1)",128,0,200,0 52 .stabs "uint_fast8_t:t(4,20)=(4,2)",128,0,205,0 53 .stabs "int_fast16_t:t(4,21)=(4,3)",128,0,210,0 54 .stabs "uint_fast16_t:t(4,22)=(4,4)",128,0,215,0 55 .stabs "int_fast32_t:t(4,23)=(4,5)",128,0,220,0 56 .stabs "uint_fast32_t:t(4,24)=(4,6)",128,0,225,0 57 .stabs "int_fast64_t:t(4,25)=(4,7)",128,0,230,0 GAS LISTING /tmp/ccfEG7oP.s page 2 58 .stabs "uint_fast64_t:t(4,26)=(4,8)",128,0,235,0 59 .stabs "intmax_t:t(4,27)=(4,7)",128,0,249,0 60 .stabs "uintmax_t:t(4,28)=(4,8)",128,0,254,0 61 .stabn 162,0,0,0 62 .stabs "int_farptr_t:t(3,1)=(4,5)",128,0,76,0 63 .stabs "uint_farptr_t:t(3,2)=(4,6)",128,0,80,0 64 .stabn 162,0,0,0 65 .stabn 162,0,0,0 66 .stabn 162,0,0,0 67 .stabs "CamConfig.h",130,0,0,0 68 .stabs "I2CInterface.h",130,0,0,0 69 .stabs "CommonDefs.h",130,0,0,0 70 .stabs "bool_t:t(7,1)=(0,11)",128,0,56,0 71 .stabn 162,0,0,0 72 .stabs "i2cCmd_t:t(6,1)=(6,2)=s2configReg:(0,11),0,8;data:(0,11),8,8;;",128,0,53,0 73 .stabn 162,0,0,0 74 .stabn 162,0,0,0 75 .stabs "I2CInt_init:F(0,15)",36,0,85,I2CInt_init 76 .global I2CInt_init 77 .type I2CInt_init, @function 78 I2CInt_init: 79 .stabd 46,0,0 1:I2CInterface.c **** /* 2:I2CInterface.c **** Copyright (C) 2004 John Orlando 3:I2CInterface.c **** 4:I2CInterface.c **** AVRcam: a small real-time image processing engine. 5:I2CInterface.c **** 6:I2CInterface.c **** This program is free software; you can redistribute it and/or 7:I2CInterface.c **** modify it under the terms of the GNU General Public 8:I2CInterface.c **** License as published by the Free Software Foundation; either 9:I2CInterface.c **** version 2 of the License, or (at your option) any later version. 10:I2CInterface.c **** 11:I2CInterface.c **** This program is distributed in the hope that it will be useful, 12:I2CInterface.c **** but WITHOUT ANY WARRANTY; without even the implied warranty of 13:I2CInterface.c **** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14:I2CInterface.c **** General Public License for more details. 15:I2CInterface.c **** 16:I2CInterface.c **** You should have received a copy of the GNU General Public 17:I2CInterface.c **** License along with this program; if not, write to the Free Software 18:I2CInterface.c **** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19:I2CInterface.c **** 20:I2CInterface.c **** For more information on the AVRcam, please contact: 21:I2CInterface.c **** 22:I2CInterface.c **** john@jrobot.net 23:I2CInterface.c **** 24:I2CInterface.c **** or go to www.jrobot.net for more details regarding the system. 25:I2CInterface.c **** */ 26:I2CInterface.c **** /*********************************************************** 27:I2CInterface.c **** Module Name: I2CInterface.c 28:I2CInterface.c **** Module Date: 4/10/2004 29:I2CInterface.c **** Module Auth: John Orlando 30:I2CInterface.c **** 31:I2CInterface.c **** Description: This module is responsible for providing a 32:I2CInterface.c **** low-level interface to the I2C hardware resident on the 33:I2CInterface.c **** mega8 processor (also known as the Two-Wire Interface, 34:I2CInterface.c **** or TWI). The interface is needed to configure the 35:I2CInterface.c **** needed registers in the OV6620 camera. This interface GAS LISTING /tmp/ccfEG7oP.s page 3 36:I2CInterface.c **** is interrupt-driven based on the events that should 37:I2CInterface.c **** occur upon successful writing of an I2C register. 38:I2CInterface.c **** 39:I2CInterface.c **** Revision History: 40:I2CInterface.c **** Date Rel Ver. Notes 41:I2CInterface.c **** 4/10/2004 0.1 Module created 42:I2CInterface.c **** 6/30/2004 1.0 Initial release for Circuit Cellar 43:I2CInterface.c **** contest. 44:I2CInterface.c **** 45:I2CInterface.c **** ***********************************************************/ 46:I2CInterface.c **** 47:I2CInterface.c **** /* Includes */ 48:I2CInterface.c **** #include 49:I2CInterface.c **** #include 50:I2CInterface.c **** #include 51:I2CInterface.c **** #include "CamConfig.h" 52:I2CInterface.c **** #include "CommonDefs.h" 53:I2CInterface.c **** 54:I2CInterface.c **** /* Local Variables */ 55:I2CInterface.c **** 56:I2CInterface.c **** /* These variables are used as storage space for the current 57:I2CInterface.c **** I2C command being sent over the interface. They need to 58:I2CInterface.c **** be volatile since they are dealt with an the TWI ISR */ 59:I2CInterface.c **** volatile static unsigned char twi_address; 60:I2CInterface.c **** volatile static unsigned char *twi_data; 61:I2CInterface.c **** volatile static unsigned char twi_ddr; 62:I2CInterface.c **** volatile static unsigned char twi_bytes; 63:I2CInterface.c **** volatile static unsigned char status; 64:I2CInterface.c **** volatile static unsigned char retry_cnt; 65:I2CInterface.c **** 66:I2CInterface.c **** /* Local Structures and Typedefs */ 67:I2CInterface.c **** 68:I2CInterface.c **** /* Extern Variables */ 69:I2CInterface.c **** 70:I2CInterface.c **** /* Definitions */ 71:I2CInterface.c **** /* Bit definitions for the tw_status register */ 72:I2CInterface.c **** #define MAX_TWI_RETRIES 2 73:I2CInterface.c **** #define BUSY 7 74:I2CInterface.c **** 75:I2CInterface.c **** /*********************************************************** 76:I2CInterface.c **** Function Name: I2CInt_init 77:I2CInterface.c **** Function Description: This function is responsible 78:I2CInterface.c **** for setting up the registers needed for the TWI 79:I2CInterface.c **** interface 80:I2CInterface.c **** 81:I2CInterface.c **** Inputs: none 82:I2CInterface.c **** Outputs: none 83:I2CInterface.c **** ***********************************************************/ 84:I2CInterface.c **** void I2CInt_init(void) 85:I2CInterface.c **** { 80 .stabn 68,0,85,.LM0-.LFBB1 81 .LM0: 82 .LFBB1: 83 /* prologue: frame size=0 */ 84 /* prologue end (size=0) */ 86:I2CInterface.c **** TWSR = 0; 85 .stabn 68,0,86,.LM1-.LFBB1 GAS LISTING /tmp/ccfEG7oP.s page 4 86 .LM1: 87 0000 11B8 out 33-0x20,__zero_reg__ 87:I2CInterface.c **** 88:I2CInterface.c **** /* init the speed of the I2C interface, running at 89:I2CInterface.c **** 100 Kbps */ 90:I2CInterface.c **** TWBR = (FOSC / I2C_SPEED - 16)/2; 88 .stabn 68,0,90,.LM2-.LFBB1 89 .LM2: 90 0002 88E4 ldi r24,lo8(72) 91 0004 80B9 out 32-0x20,r24 92 /* epilogue: frame size=0 */ 93 0006 0895 ret 94 /* epilogue end (size=1) */ 95 /* function I2CInt_init size 4 (3) */ 96 .size I2CInt_init, .-I2CInt_init 97 .Lscope1: 98 .stabs "",36,0,0,.Lscope1-.LFBB1 99 .stabd 78,0,0 100 .stabs "I2CInt_writeData:F(0,15)",36,0,108,I2CInt_writeData 101 .stabs "address:P(0,11)",64,0,107,25 102 .stabs "data:P(0,16)=*(0,11)",64,0,107,22 103 .stabs "bytes:P(0,11)",64,0,107,20 104 .global I2CInt_writeData 105 .type I2CInt_writeData, @function 106 I2CInt_writeData: 107 .stabd 46,0,0 91:I2CInterface.c **** } 92:I2CInterface.c **** 93:I2CInterface.c **** /*********************************************************** 94:I2CInterface.c **** Function Name: I2CInt_writeData 95:I2CInterface.c **** Function Description: This function is responsible for 96:I2CInterface.c **** initiating the process of writing a sequence of bytes 97:I2CInterface.c **** an I2C slave address. This function will try to write 98:I2CInterface.c **** the data three times before giving up. 99:I2CInterface.c **** Inputs: address: the address of the I2C slave device 100:I2CInterface.c **** data: a pointer to the data to be written 101:I2CInterface.c **** to the slave...for camera interfacing, 102:I2CInterface.c **** the data follows a 103:I2CInterface.c **** format 104:I2CInterface.c **** bytes: the number of bytes to write 105:I2CInterface.c **** Outputs: none 106:I2CInterface.c **** ***********************************************************/ 107:I2CInterface.c **** void I2CInt_writeData(unsigned char address, unsigned char *data, unsigned char bytes) 108:I2CInterface.c **** { 108 .stabn 68,0,108,.LM3-.LFBB2 109 .LM3: 110 .LFBB2: 111 /* prologue: frame size=0 */ 112 /* prologue end (size=0) */ 113 0008 982F mov r25,r24 114 .L5: 109:I2CInterface.c **** while(status & (1< 178:I2CInterface.c **** Function Description: This function is responsible for 179:I2CInterface.c **** implementing the control logic needed to perform a 180:I2CInterface.c **** read or write operation with an I2C slave. 181:I2CInterface.c **** Inputs: none 182:I2CInterface.c **** Outputs: none 183:I2CInterface.c **** ***********************************************************/ 184:I2CInterface.c **** SIGNAL(SIG_2WIRE_SERIAL) 185:I2CInterface.c **** { 245 .stabn 68,0,185,.LM25-.LFBB5 246 .LM25: 247 .LFBB5: 248 /* prologue: frame size=0 */ 249 0082 1F92 push __zero_reg__ 250 0084 0F92 push __tmp_reg__ 251 0086 0FB6 in __tmp_reg__,__SREG__ 252 0088 0F92 push __tmp_reg__ 253 008a 1124 clr __zero_reg__ 254 008c 8F93 push r24 255 008e 9F93 push r25 256 0090 AF93 push r26 257 0092 BF93 push r27 258 0094 EF93 push r30 259 0096 FF93 push r31 260 /* prologue end (size=11) */ 186:I2CInterface.c **** unsigned char TWI_status = TWSR & TW_STATUS_MASK; /* grab just the status bits */ 261 .stabn 68,0,186,.LM26-.LFBB5 262 .LM26: 263 0098 81B1 in r24,33-0x20 187:I2CInterface.c **** 188:I2CInterface.c **** /* the entire I2C handler is state-based...determine 189:I2CInterface.c **** what needs to be done based on TWI_status */ 190:I2CInterface.c **** switch(TWI_status) 264 .stabn 68,0,190,.LM27-.LFBB5 265 .LM27: 266 009a 9927 clr r25 GAS LISTING /tmp/ccfEG7oP.s page 9 267 009c AA27 clr r26 268 009e BB27 clr r27 269 00a0 887F andi r24,lo8(248) 270 00a2 9070 andi r25,hi8(248) 271 00a4 A070 andi r26,hlo8(248) 272 00a6 B070 andi r27,hhi8(248) 273 00a8 FC01 movw r30,r24 274 00aa 3897 sbiw r30,8 275 00ac E135 cpi r30,81 276 00ae F105 cpc r31,__zero_reg__ 277 00b0 00F0 brlo .+2 278 00b2 00C0 rjmp .L42 279 .stabn 68,0,190,.LM28-.LFBB5 280 .LM28: 281 00b4 E050 subi r30,lo8(-(pm(.L33))) 282 00b6 F040 sbci r31,hi8(-(pm(.L33))) 283 00b8 0994 ijmp 284 .data 285 .section .progmem.gcc_sw_table, "ax", @progbits 286 .p2align 1 287 .L33: 288 .data 289 .section .progmem.gcc_sw_table, "ax", @progbits 290 .p2align 1 291 0000 00C0 rjmp .L25 292 0002 00C0 rjmp .L42 293 0004 00C0 rjmp .L42 294 0006 00C0 rjmp .L42 295 0008 00C0 rjmp .L42 296 000a 00C0 rjmp .L42 297 000c 00C0 rjmp .L42 298 000e 00C0 rjmp .L42 299 0010 00C0 rjmp .L25 300 0012 00C0 rjmp .L42 301 0014 00C0 rjmp .L42 302 0016 00C0 rjmp .L42 303 0018 00C0 rjmp .L42 304 001a 00C0 rjmp .L42 305 001c 00C0 rjmp .L42 306 001e 00C0 rjmp .L42 307 0020 00C0 rjmp .L26 308 0022 00C0 rjmp .L42 309 0024 00C0 rjmp .L42 310 0026 00C0 rjmp .L42 311 0028 00C0 rjmp .L42 312 002a 00C0 rjmp .L42 313 002c 00C0 rjmp .L42 314 002e 00C0 rjmp .L42 315 0030 00C0 rjmp .L27 316 0032 00C0 rjmp .L42 317 0034 00C0 rjmp .L42 318 0036 00C0 rjmp .L42 319 0038 00C0 rjmp .L42 320 003a 00C0 rjmp .L42 321 003c 00C0 rjmp .L42 322 003e 00C0 rjmp .L42 323 0040 00C0 rjmp .L28 GAS LISTING /tmp/ccfEG7oP.s page 10 324 0042 00C0 rjmp .L42 325 0044 00C0 rjmp .L42 326 0046 00C0 rjmp .L42 327 0048 00C0 rjmp .L42 328 004a 00C0 rjmp .L42 329 004c 00C0 rjmp .L42 330 004e 00C0 rjmp .L42 331 0050 00C0 rjmp .L29 332 0052 00C0 rjmp .L42 333 0054 00C0 rjmp .L42 334 0056 00C0 rjmp .L42 335 0058 00C0 rjmp .L42 336 005a 00C0 rjmp .L42 337 005c 00C0 rjmp .L42 338 005e 00C0 rjmp .L42 339 0060 00C0 rjmp .L42 340 0062 00C0 rjmp .L42 341 0064 00C0 rjmp .L42 342 0066 00C0 rjmp .L42 343 0068 00C0 rjmp .L42 344 006a 00C0 rjmp .L42 345 006c 00C0 rjmp .L42 346 006e 00C0 rjmp .L42 347 0070 00C0 rjmp .L30 348 0072 00C0 rjmp .L42 349 0074 00C0 rjmp .L42 350 0076 00C0 rjmp .L42 351 0078 00C0 rjmp .L42 352 007a 00C0 rjmp .L42 353 007c 00C0 rjmp .L42 354 007e 00C0 rjmp .L42 355 0080 00C0 rjmp .L27 356 0082 00C0 rjmp .L42 357 0084 00C0 rjmp .L42 358 0086 00C0 rjmp .L42 359 0088 00C0 rjmp .L42 360 008a 00C0 rjmp .L42 361 008c 00C0 rjmp .L42 362 008e 00C0 rjmp .L42 363 0090 00C0 rjmp .L31 364 0092 00C0 rjmp .L42 365 0094 00C0 rjmp .L42 366 0096 00C0 rjmp .L42 367 0098 00C0 rjmp .L42 368 009a 00C0 rjmp .L42 369 009c 00C0 rjmp .L42 370 009e 00C0 rjmp .L42 371 00a0 00C0 rjmp .L32 372 .text 373 .L25: 191:I2CInterface.c **** { 192:I2CInterface.c **** case TW_START: /* Start condition */ 193:I2CInterface.c **** case TW_REP_START: /* Repeated start condition */ 194:I2CInterface.c **** if(retry_cnt > MAX_TWI_RETRIES) 374 .stabn 68,0,194,.LM29-.LFBB5 375 .LM29: 376 00ba 8091 0000 lds r24,retry_cnt GAS LISTING /tmp/ccfEG7oP.s page 11 377 00be 8330 cpi r24,lo8(3) 378 00c0 00F0 brlo .L34 195:I2CInterface.c **** { 196:I2CInterface.c **** /* generate stop condition if we've reached our retry limit */ 197:I2CInterface.c **** TWCR |= (1< 0) 437 .stabn 68,0,226,.LM40-.LFBB5 438 .LM40: 439 011c 8091 0000 lds r24,twi_bytes 440 0120 8150 subi r24,lo8(-(-1)) 441 0122 8093 0000 sts twi_bytes,r24 442 0126 8091 0000 lds r24,twi_bytes 443 012a 8823 tst r24 444 012c 01F0 breq .L36 227:I2CInterface.c **** { 228:I2CInterface.c **** /* more data to send, so send it */ 229:I2CInterface.c **** TWDR = *twi_data; 445 .stabn 68,0,229,.LM41-.LFBB5 446 .LM41: 447 012e E091 0000 lds r30,twi_data 448 0132 F091 0000 lds r31,(twi_data)+1 449 0136 8191 ld r24,Z+ 450 0138 83B9 out 35-0x20,r24 230:I2CInterface.c **** twi_data++; 451 .stabn 68,0,230,.LM42-.LFBB5 452 .LM42: 453 013a F093 0000 sts (twi_data)+1,r31 454 013e E093 0000 sts twi_data,r30 GAS LISTING /tmp/ccfEG7oP.s page 13 231:I2CInterface.c **** TWCR |= (1< 0) 486 .stabn 68,0,248,.LM48-.LFBB5 487 .LM48: 488 016e 8091 0000 lds r24,twi_bytes 489 0172 8150 subi r24,lo8(-(-1)) 490 0174 8093 0000 sts twi_bytes,r24 491 0178 8091 0000 lds r24,twi_bytes 492 017c 8823 tst r24 493 017e 01F0 breq .L38 GAS LISTING /tmp/ccfEG7oP.s page 14 249:I2CInterface.c **** { 250:I2CInterface.c **** /* if there is more than one byte to read, acknowledge */ 251:I2CInterface.c **** TWCR |= (1< 0) 518 .stabn 68,0,265,.LM53-.LFBB5 519 .LM53: 520 01a4 8091 0000 lds r24,twi_bytes 521 01a8 8150 subi r24,lo8(-(-1)) 522 01aa 8093 0000 sts twi_bytes,r24 523 01ae 8091 0000 lds r24,twi_bytes 524 01b2 8823 tst r24 525 01b4 01F0 breq .L40 266:I2CInterface.c **** { 267:I2CInterface.c **** /* get the next data byte and ack */ 268:I2CInterface.c **** TWCR |= (1< end of read process */ 278:I2CInterface.c **** /* read data, and generate the stop condition */ 279:I2CInterface.c **** *twi_data = TWDR; 540 .stabn 68,0,279,.LM56-.LFBB5 541 .LM56: 542 01c6 E091 0000 lds r30,twi_data 543 01ca F091 0000 lds r31,(twi_data)+1 544 01ce 83B1 in r24,35-0x20 545 01d0 8083 st Z,r24 280:I2CInterface.c **** TWCR |= (1<