 |
 |
| View previous topic :: View next topic |
| Author |
Message |
allenhuffman
Joined: 17 Jun 2019
Posts: 552
Location: Des Moines, Iowa, USA
|
| Is source for I2C functions provided? |
 Posted: Thu Aug 22, 2019 1:46 pm |
 |
|
Is the source code for any of the built in library functions, specifically I2C, available?
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ? |
|
 |
newguy
Joined: 24 Jun 2004
Posts: 1907
|
|
| Posted: Thu Aug 22, 2019 2:02 pm |
|
|
Near the top of each processor's include file, for example "18F452.h" will be a #nolist. Comment that out and recompile. I believe that whatever built-in functions you use will then be visible in the list file (disassembly).
Also note that the compiler can be set to use register names/variable names in the list file. Project->Output Files->List File. Relevant boxes are SFR Names, Symbols, Interpret. |
|
|
temtronic
Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario
|
|
| Posted: Thu Aug 22, 2019 2:04 pm |
|
|
Yes, all compiled code can be seen in the listing, though you may need to delete the '#nolist' option for some drivers.
also
the listing is NOT in 'program memory' order |
|
|
allenhuffman
Joined: 17 Jun 2019
Posts: 552
Location: Des Moines, Iowa, USA
|
|
| Posted: Thu Aug 22, 2019 2:49 pm |
|
|
Thanks ... I'm not sure I am looking in the proper place. I commented out #nolist, then it wanted me to save it with the project. I did that, and then even put a #error line in to make sure it was reference MY copy (it is -- I changed the #include <file> to "file" like normal C, which might not have been necessary).
I don't think I saw the generated asm from this. I do see a bunch (half a dozen or more) blank "....." lines with the _bif prototype of i2c_read() but no related assembly. I searched through the 82,000+ lines of the list file for the "i2c_read" references but didn't find any asm that wasn't for the calls in our code.
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ? |
|
|
temtronic
Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario
|
|
| Posted: Thu Aug 22, 2019 3:09 pm |
|
|
Here's a snippet from my modified DS3231 RTC driver..It's similar to the DS1307 driver and the 1st one that know has I2C functions in it...
from the .lst file...
| Code: |
.................... rtcsec = bcd2bin(i2c_read() & 0x7f);
03656: MOVLW 01
03658: MOVWF 00
0365A: CALL 0148
0365E: MOVF 01,W
03660: ANDLW 7F
03662: MOVWF xBD
03664: MOVWF xC2
03666: CALL 0196
0366A: MOVFF 01,10 |
I know the code works... |
|
|
allenhuffman
Joined: 17 Jun 2019
Posts: 552
Location: Des Moines, Iowa, USA
|
|
| Posted: Thu Aug 22, 2019 3:44 pm |
|
|
Ah, I see. I'm seeing the code in-lined, rather than finding the i2c_read() function somewhere else?
_________________
Allen C. Huffman, Sub-Etha Software (est. 1990) http://www.subethasoftware.com
Embedded C, Arduino, MSP430, ESP8266/32, BASIC Stamp and PIC24 programmer.
http://www.whywouldyouwanttodothat.com ? |
|
|
jeremiah
Joined: 20 Jul 2010
Posts: 1346
|
|
| Posted: Thu Aug 22, 2019 4:53 pm |
|
|
| In some cases yes. For situations that they use non inlined functions, at least for me in the PCD compiler, it shows the functions under their respective "#use" directive in the disassembly. |
|
|
temtronic
Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario
|
|
| Posted: Thu Aug 22, 2019 5:04 pm |
|
|
Here's what the code at CALL 0148 looks like.
Obviously no comments, though if you look at the PIC instruction set and SFR list, you can decode what is happening.
| Code: |
00148: MOVLW 08
0014A: MOVWF xC2
0014C: MOVFF 00,C3
00150: BSF F94.4
00152: BRA 0154
00154: NOP
00156: BSF F94.3
00158: BTFSS F82.3
0015A: BRA 0158
0015C: BTFSC F82.4
0015E: BSF FD8.0
00160: BTFSS F82.4
00162: BCF FD8.0
00164: RLCF 01,F
00166: BRA 0168
00168: BCF F94.3
0016A: BCF F8B.3
0016C: DECFSZ xC2,F
0016E: BRA 0150
00170: BSF F94.4
00172: BRA 0174
00174: NOP
00176: BCF F8B.4
00178: MOVF xC3,W
0017A: BTFSS FD8.2
0017C: BCF F94.4
0017E: NOP
00180: BSF F94.3
00182: BTFSS F82.3
00184: BRA 0182
00186: BRA 0188
00188: BCF F8B.3
0018A: BCF F94.3
0018C: BRA 018E
0018E: NOP
00190: BCF F8B.4
00192: BCF F94.4
00194: RETLW 00
|
Hopefully I'm not breaking the 'rules'...this code is available for all to see. If I have please let me know.
The other call (196 ?) goes to the BINBCD routines.
Jay |
|
|
Ttelmah
Joined: 11 Mar 2010
Posts: 19505
|
|
| Posted: Fri Aug 23, 2019 1:22 am |
|
|
and (of course) if you switch the compiler to 'symbolic' mode, it'll tell
you the register names etc.. |
|
|
PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
|
| Posted: Fri Aug 23, 2019 2:34 am |
|
|
| allenhuffman wrote: |
I don't think I saw the generated asm from this. I do see a bunch (half a
dozen or more) blank "....." lines with the _bif prototype of i2c_read() but
no related assembly. |
In the .LST file, the i2c code will be placed underneath the #use i2c()
statement. Example:
| Code: | .................... #use i2c(master, i2c1, slow)
000AE: BCF SSP1CON1.SSPOV
000B0: BSF SSP1CON2.RCEN
000B2: BTFSC SSP1CON2.RCEN
000B4: BRA 00B2
000B6: BTFSC 00.0
000B8: BCF SSP1CON2.ACKDT
000BA: BTFSS 00.0
000BC: BSF SSP1CON2.ACKDT
000BE: BSF SSP1CON2.ACKEN
000C0: BTFSC SSP1CON2.ACKEN
000C2: BRA 00C0
000C4: MOVFF SSP1BUF,01
000C8: RETURN 0 |
The above code is for i2c_read() for the 18F46K22.
| allenhuffman wrote: |
I searched through the 82,000+ lines of the list file for the "i2c_read"
references but didn't find any asm that wasn't for the calls in our code. |
You won't see labels for the CCS Library code in the .LST file or
in the View / Assembly Listing. You will see them in View / Program
Memory. (This is in MPLAB vs. 8.92) Here is the beginning of the code,
to show how the label is displayed:
| Code: |
Line Address Opcode Label Disassembly
88 00AE 9CC6 @I2C_READU_ BCF SSP1CON1, 0x06, ACCESS
89 00B0 86C5 BCF SSP1CON2, 0x03, ACCESS
90 00B2 B6C5 BTFSC SSP1CON2, 0x3, ACCESS
91 00B4 D7FE BRA 0xb2
|
|
|
|
Ttelmah
Joined: 11 Mar 2010
Posts: 19505
|
|
| Posted: Fri Aug 23, 2019 3:34 am |
|
|
Just a slight 'eppend' to this.
The labels are present in the .sym file. So (for example), on a project of mine:
In the sym:
00110A @I2C_WRITEU_1
and (compiled with SFR names selected), the .lst gives:
| Code: |
.................... #USE I2C(I2C1, FAST=400000, STREAM=EEPROM) //EEPROM uses ALTI2C1 connections
*
0110A: MOV #FFFF,W0
0110C: BTSS.B I2C1STAT.S
0110E: BRA 111A
01110: BTSC.B I2C1STAT.TRSTAT
01112: BRA 1110
01114: MOV W1,I2C1TRN
01116: BTSC.B I2C1STAT.TRSTAT
01118: BRA 1116
0111A: MOV #0,W0
0111C: BTSC.B I2C1STAT.ACKSTAT
0111E: INC W0,W0
01120: RETURN
|
So 'where' the routine is is in the .sym file, and the code for this is in
the .lst file. |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
