GAS LISTING /tmp/ccZHfAgR.s page 1 1 .file "I2CInterface.c" 2 .arch atmega8 3 __SREG__ = 0x3f 4 __SP_H__ = 0x3e 5 __SP_L__ = 0x3d 6 __tmp_reg__ = 0 7 __zero_reg__ = 1 8 .global __do_copy_data 9 .global __do_clear_bss 10 .stabs "/home/kaklik/projects/programy/Atmel_C/AVRcam/",100,0,2,.Ltext0 11 .stabs "I2CInterface.c",100,0,2,.Ltext0 12 .text 13 .Ltext0: 14 .stabs "gcc2_compiled.",60,0,0,0 15 .stabs "int:t(0,1)=r(0,1);-32768;32767;",128,0,0,0 16 .stabs "char:t(0,2)=@s8;r(0,2);0;255;",128,0,0,0 17 .stabs "long int:t(0,3)=@s32;r(0,3);020000000000;017777777777;",128,0,0,0 18 .stabs "unsigned int:t(0,4)=r(0,4);0;0177777;",128,0,0,0 19 .stabs "long unsigned int:t(0,5)=@s32;r(0,5);0;037777777777;",128,0,0,0 20 .stabs "long long int:t(0,6)=@s64;r(0,6);01000000000000000000000;0777777777777777777777;",128,0,0, 21 .stabs "long long unsigned int:t(0,7)=@s64;r(0,7);0;01777777777777777777777;",128,0,0,0 22 .stabs "short int:t(0,8)=r(0,8);-32768;32767;",128,0,0,0 23 .stabs "short unsigned int:t(0,9)=r(0,9);0;0177777;",128,0,0,0 24 .stabs "signed char:t(0,10)=@s8;r(0,10);-128;127;",128,0,0,0 25 .stabs "unsigned char:t(0,11)=@s8;r(0,11);0;255;",128,0,0,0 26 .stabs "float:t(0,12)=r(0,1);4;0;",128,0,0,0 27 .stabs "double:t(0,13)=r(0,1);4;0;",128,0,0,0 28 .stabs "long double:t(0,14)=r(0,1);4;0;",128,0,0,0 29 .stabs "void:t(0,15)=(0,15)",128,0,0,0 30 .stabs "/usr/lib/gcc/avr/4.1.0/../../../../avr/include/avr/io.h",130,0,0,0 31 .stabs "/usr/lib/gcc/avr/4.1.0/../../../../avr/include/avr/sfr_defs.h",130,0,0,0 32 .stabs "/usr/lib/gcc/avr/4.1.0/../../../../avr/include/inttypes.h",130,0,0,0 33 .stabs "/usr/lib/gcc/avr/4.1.0/../../../../avr/include/stdint.h",130,0,0,0 34 .stabs "int8_t:t(4,1)=(0,10)",128,0,116,0 35 .stabs "uint8_t:t(4,2)=(0,11)",128,0,117,0 36 .stabs "int16_t:t(4,3)=(0,1)",128,0,118,0 37 .stabs "uint16_t:t(4,4)=(0,4)",128,0,119,0 38 .stabs "int32_t:t(4,5)=(0,3)",128,0,120,0 39 .stabs "uint32_t:t(4,6)=(0,5)",128,0,121,0 40 .stabs "int64_t:t(4,7)=(0,6)",128,0,122,0 41 .stabs "uint64_t:t(4,8)=(0,7)",128,0,123,0 42 .stabs "intptr_t:t(4,9)=(4,3)",128,0,135,0 43 .stabs "uintptr_t:t(4,10)=(4,4)",128,0,140,0 44 .stabs "int_least8_t:t(4,11)=(4,1)",128,0,152,0 45 .stabs "uint_least8_t:t(4,12)=(4,2)",128,0,157,0 46 .stabs "int_least16_t:t(4,13)=(4,3)",128,0,162,0 47 .stabs "uint_least16_t:t(4,14)=(4,4)",128,0,167,0 48 .stabs "int_least32_t:t(4,15)=(4,5)",128,0,172,0 49 .stabs "uint_least32_t:t(4,16)=(4,6)",128,0,177,0 50 .stabs "int_least64_t:t(4,17)=(4,7)",128,0,182,0 51 .stabs "uint_least64_t:t(4,18)=(4,8)",128,0,187,0 52 .stabs "int_fast8_t:t(4,19)=(4,1)",128,0,200,0 53 .stabs "uint_fast8_t:t(4,20)=(4,2)",128,0,205,0 54 .stabs "int_fast16_t:t(4,21)=(4,3)",128,0,210,0 55 .stabs "uint_fast16_t:t(4,22)=(4,4)",128,0,215,0 56 .stabs "int_fast32_t:t(4,23)=(4,5)",128,0,220,0 57 .stabs "uint_fast32_t:t(4,24)=(4,6)",128,0,225,0 GAS LISTING /tmp/ccZHfAgR.s page 2 58 .stabs "int_fast64_t:t(4,25)=(4,7)",128,0,230,0 59 .stabs "uint_fast64_t:t(4,26)=(4,8)",128,0,235,0 60 .stabs "intmax_t:t(4,27)=(4,7)",128,0,249,0 61 .stabs "uintmax_t:t(4,28)=(4,8)",128,0,254,0 62 .stabn 162,0,0,0 63 .stabs "int_farptr_t:t(3,1)=(4,5)",128,0,76,0 64 .stabs "uint_farptr_t:t(3,2)=(4,6)",128,0,80,0 65 .stabn 162,0,0,0 66 .stabn 162,0,0,0 67 .stabn 162,0,0,0 68 .stabs "CamConfig.h",130,0,0,0 69 .stabs "I2CInterface.h",130,0,0,0 70 .stabs "CommonDefs.h",130,0,0,0 71 .stabs "bool_t:t(7,1)=(0,11)",128,0,56,0 72 .stabn 162,0,0,0 73 .stabs "i2cCmd_t:t(6,1)=(6,2)=s2configReg:(0,11),0,8;data:(0,11),8,8;;",128,0,53,0 74 .stabn 162,0,0,0 75 .stabn 162,0,0,0 76 .stabs "I2CInt_init:F(0,15)",36,0,85,I2CInt_init 77 .global I2CInt_init 78 .type I2CInt_init, @function 79 I2CInt_init: 80 .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 GAS LISTING /tmp/ccZHfAgR.s page 3 35:I2CInterface.c **** needed registers in the OV6620 camera. This interface 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 **** { 81 .stabn 68,0,85,.LM0-I2CInt_init 82 .LM0: 83 /* prologue: frame size=0 */ 84 /* prologue end (size=0) */ 86:I2CInterface.c **** TWSR = 0; 85 .stabn 68,0,86,.LM1-I2CInt_init GAS LISTING /tmp/ccZHfAgR.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-I2CInt_init 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 .Lscope0: 98 .stabs "",36,0,0,.Lscope0-I2CInt_init 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-I2CInt_writeData 109 .LM3: 110 /* prologue: frame size=0 */ 111 /* prologue end (size=0) */ 112 0008 982F mov r25,r24 113 .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 **** { 242 .stabn 68,0,185,.LM25-__vector_17 243 .LM25: 244 /* prologue: frame size=0 */ 245 0082 1F92 push __zero_reg__ 246 0084 0F92 push __tmp_reg__ 247 0086 0FB6 in __tmp_reg__,__SREG__ 248 0088 0F92 push __tmp_reg__ 249 008a 1124 clr __zero_reg__ 250 008c 8F93 push r24 251 008e 9F93 push r25 252 0090 AF93 push r26 253 0092 BF93 push r27 254 0094 EF93 push r30 255 0096 FF93 push r31 256 /* prologue end (size=11) */ 186:I2CInterface.c **** unsigned char TWI_status = TWSR & TW_STATUS_MASK; /* grab just the status bits */ 257 .stabn 68,0,186,.LM26-__vector_17 258 .LM26: 259 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) 260 .stabn 68,0,190,.LM27-__vector_17 261 .LM27: 262 009a 9927 clr r25 263 009c AA27 clr r26 264 009e BB27 clr r27 265 00a0 887F andi r24,lo8(248) 266 00a2 9070 andi r25,hi8(248) GAS LISTING /tmp/ccZHfAgR.s page 9 267 00a4 A070 andi r26,hlo8(248) 268 00a6 B070 andi r27,hhi8(248) 269 00a8 FC01 movw r30,r24 270 00aa 3897 sbiw r30,8 271 00ac E135 cpi r30,81 272 00ae F105 cpc r31,__zero_reg__ 273 00b0 08F0 brlo .+2 274 00b2 9AC0 rjmp .L42 275 .stabn 68,0,190,.LM28-__vector_17 276 .LM28: 277 00b4 E050 subi r30,lo8(-(pm(.L33))) 278 00b6 F040 sbci r31,hi8(-(pm(.L33))) 279 00b8 0994 ijmp 280 .data 281 .section .progmem.gcc_sw_table, "ax", @progbits 282 .p2align 1 283 .L33: 284 .data 285 .section .progmem.gcc_sw_table, "ax", @progbits 286 .p2align 1 287 0000 00C0 rjmp .L25 288 0002 00C0 rjmp .L42 289 0004 00C0 rjmp .L42 290 0006 00C0 rjmp .L42 291 0008 00C0 rjmp .L42 292 000a 00C0 rjmp .L42 293 000c 00C0 rjmp .L42 294 000e 00C0 rjmp .L42 295 0010 00C0 rjmp .L25 296 0012 00C0 rjmp .L42 297 0014 00C0 rjmp .L42 298 0016 00C0 rjmp .L42 299 0018 00C0 rjmp .L42 300 001a 00C0 rjmp .L42 301 001c 00C0 rjmp .L42 302 001e 00C0 rjmp .L42 303 0020 00C0 rjmp .L26 304 0022 00C0 rjmp .L42 305 0024 00C0 rjmp .L42 306 0026 00C0 rjmp .L42 307 0028 00C0 rjmp .L42 308 002a 00C0 rjmp .L42 309 002c 00C0 rjmp .L42 310 002e 00C0 rjmp .L42 311 0030 00C0 rjmp .L27 312 0032 00C0 rjmp .L42 313 0034 00C0 rjmp .L42 314 0036 00C0 rjmp .L42 315 0038 00C0 rjmp .L42 316 003a 00C0 rjmp .L42 317 003c 00C0 rjmp .L42 318 003e 00C0 rjmp .L42 319 0040 00C0 rjmp .L28 320 0042 00C0 rjmp .L42 321 0044 00C0 rjmp .L42 322 0046 00C0 rjmp .L42 323 0048 00C0 rjmp .L42 GAS LISTING /tmp/ccZHfAgR.s page 10 324 004a 00C0 rjmp .L42 325 004c 00C0 rjmp .L42 326 004e 00C0 rjmp .L42 327 0050 00C0 rjmp .L29 328 0052 00C0 rjmp .L42 329 0054 00C0 rjmp .L42 330 0056 00C0 rjmp .L42 331 0058 00C0 rjmp .L42 332 005a 00C0 rjmp .L42 333 005c 00C0 rjmp .L42 334 005e 00C0 rjmp .L42 335 0060 00C0 rjmp .L42 336 0062 00C0 rjmp .L42 337 0064 00C0 rjmp .L42 338 0066 00C0 rjmp .L42 339 0068 00C0 rjmp .L42 340 006a 00C0 rjmp .L42 341 006c 00C0 rjmp .L42 342 006e 00C0 rjmp .L42 343 0070 00C0 rjmp .L30 344 0072 00C0 rjmp .L42 345 0074 00C0 rjmp .L42 346 0076 00C0 rjmp .L42 347 0078 00C0 rjmp .L42 348 007a 00C0 rjmp .L42 349 007c 00C0 rjmp .L42 350 007e 00C0 rjmp .L42 351 0080 00C0 rjmp .L27 352 0082 00C0 rjmp .L42 353 0084 00C0 rjmp .L42 354 0086 00C0 rjmp .L42 355 0088 00C0 rjmp .L42 356 008a 00C0 rjmp .L42 357 008c 00C0 rjmp .L42 358 008e 00C0 rjmp .L42 359 0090 00C0 rjmp .L31 360 0092 00C0 rjmp .L42 361 0094 00C0 rjmp .L42 362 0096 00C0 rjmp .L42 363 0098 00C0 rjmp .L42 364 009a 00C0 rjmp .L42 365 009c 00C0 rjmp .L42 366 009e 00C0 rjmp .L42 367 00a0 00C0 rjmp .L32 368 .text 369 .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) 370 .stabn 68,0,194,.LM29-__vector_17 371 .LM29: 372 00ba 8091 0000 lds r24,retry_cnt 373 00be 8330 cpi r24,lo8(3) 374 00c0 48F0 brlo .L34 195:I2CInterface.c **** { 196:I2CInterface.c **** /* generate stop condition if we've reached our retry limit */ GAS LISTING /tmp/ccZHfAgR.s page 11 197:I2CInterface.c **** TWCR |= (1< 0) 434 .stabn 68,0,226,.LM40-__vector_17 435 .LM40: 436 011e 8091 0000 lds r24,twi_bytes 437 0122 8150 subi r24,lo8(-(-1)) 438 0124 8093 0000 sts twi_bytes,r24 439 0128 8091 0000 lds r24,twi_bytes 440 012c 8823 tst r24 441 012e 79F0 breq .L36 227:I2CInterface.c **** { 228:I2CInterface.c **** /* more data to send, so send it */ 229:I2CInterface.c **** TWDR = *twi_data; 442 .stabn 68,0,229,.LM41-__vector_17 443 .LM41: 444 0130 E091 0000 lds r30,twi_data 445 0134 F091 0000 lds r31,(twi_data)+1 446 0138 8081 ld r24,Z 447 013a 83B9 out 35-0x20,r24 230:I2CInterface.c **** twi_data++; 448 .stabn 68,0,230,.LM42-__vector_17 449 .LM42: 450 013c 3196 adiw r30,1 451 013e F093 0000 sts (twi_data)+1,r31 452 0142 E093 0000 sts twi_data,r30 231:I2CInterface.c **** TWCR |= (1< 0) 484 .stabn 68,0,248,.LM48-__vector_17 485 .LM48: 486 0172 8091 0000 lds r24,twi_bytes 487 0176 8150 subi r24,lo8(-(-1)) 488 0178 8093 0000 sts twi_bytes,r24 489 017c 8091 0000 lds r24,twi_bytes 490 0180 8823 tst r24 491 0182 21F0 breq .L38 249:I2CInterface.c **** { 250:I2CInterface.c **** /* if there is more than one byte to read, acknowledge */ GAS LISTING /tmp/ccZHfAgR.s page 14 251:I2CInterface.c **** TWCR |= (1< 0) 517 .stabn 68,0,265,.LM53-__vector_17 518 .LM53: 519 01aa 8091 0000 lds r24,twi_bytes 520 01ae 8150 subi r24,lo8(-(-1)) 521 01b0 8093 0000 sts twi_bytes,r24 522 01b4 8091 0000 lds r24,twi_bytes 523 01b8 8823 tst r24 524 01ba 21F0 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; 539 .stabn 68,0,279,.LM56-__vector_17 540 .LM56: 541 01cc E091 0000 lds r30,twi_data 542 01d0 F091 0000 lds r31,(twi_data)+1 543 01d4 83B1 in r24,35-0x20 544 01d6 8083 st Z,r24 280:I2CInterface.c **** TWCR |= (1<