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allenhuffman
Joined: 17 Jun 2019
Posts: 537
Location: Des Moines, Iowa, USA
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| #device ANSI |
 Posted: Wed Feb 26, 2020 2:46 pm |
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Here is what CCS reports using "#device ANSI" does (it includes a few things not listed in the PDF manual):
Default signed.
Default case sensitive.
Default overloading allowed.
const is treated as readonly, not our special rom thing.
All RAM is zeroed at the start of main().
Not sure what "default signed" implies. I did some tests, and "int/char/int16/etc." all appear to be signed in default (CCS4?) mode. Also, function overloads seem to be supported without specifying ANSI.
_________________
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 ? |
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allenhuffman
Joined: 17 Jun 2019
Posts: 537
Location: Des Moines, Iowa, USA
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| Posted: Wed Feb 26, 2020 3:08 pm |
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| Quote: | | All RAM is zeroed at the start of main(). |
I did a quick test with this and confirmed it works. I looked for a way to do this without using ANSI and found:
| Code: | #zero_ram
void main()
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Do that and it clears memory before it runs. The details say:
| Quote: | | This directive zero's out all of the internal registers that may be used to hold variables before program execution begins. |
...registers? But it does appear to clear RAM as the name says.
Update: And there is also #zero_local_ram, which just zeros out any uninitialized variables. This can generate much larger code than just clearing the entire memory, but may be useful if you are trying to keep some memory preserved between code restarts.
_________________
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 ?
Last edited by allenhuffman on Wed Feb 26, 2020 3:57 pm; edited 1 time in total |
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allenhuffman
Joined: 17 Jun 2019
Posts: 537
Location: Des Moines, Iowa, USA
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| Posted: Wed Feb 26, 2020 3:13 pm |
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| Quote: | | Default case sensitive. |
Using:
Will give you this without using ANSI.
_________________
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 ?
Last edited by allenhuffman on Wed Feb 26, 2020 3:16 pm; edited 1 time in total |
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allenhuffman
Joined: 17 Jun 2019
Posts: 537
Location: Des Moines, Iowa, USA
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| Posted: Wed Feb 26, 2020 3:15 pm |
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| Quote: | | const is treated as readonly, not our special rom thing. |
Likely, this will do the same thing w/o using ANSI:
| Quote: | #device CONST=READ_ONLY
Uses the ANSI keyword CONST definition, making CONST variables read only, rather than located in program memory. |
_________________
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 ? |
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temtronic
Joined: 01 Jul 2010
Posts: 9128
Location: Greensville,Ontario
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| Posted: Wed Feb 26, 2020 3:16 pm |
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16/18 series PICs, CCS defaults int8 to unsigned
from the manual 'data defintions, basic types'..
...Data is always positive. This is the default data type if not specified.
Pretty sure with PIC24s, the default is signed.... though I don't use PIC24s.
re: ZERO RAM, yes only affects RAM not SFRs.... Microchip tend to think of 'where stuff is stored' as 'registers'. RAM is also called GPR, or General Purpose Registers. |
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allenhuffman
Joined: 17 Jun 2019
Posts: 537
Location: Des Moines, Iowa, USA
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| Posted: Wed Feb 26, 2020 3:18 pm |
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| temtronic wrote: | | 16/18 series PICs, CCS defaults int8 to unsigned |
Thanks for the clarification. I notice manual sections will say [PCD] by some items. I believe that is what I am using (About says so) but I wondered if there was something that specified changes between PIC18/PIC24/PIC32/etc. I should be watching out for.
_________________
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 ? |
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temtronic
Joined: 01 Jul 2010
Posts: 9128
Location: Greensville,Ontario
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| Posted: Wed Feb 26, 2020 5:14 pm |
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Compiler version is based on PIC series....need to look at CCS site for what's what...
I know there's differences, size of words, default types, etc. but I'm sticking to PIC18F46K22s as my 'Swiss Army Knife' PIC. Too old to play with multiple PICs though at one time I was fluent with Z80 ASM, 68HC11 ASM, Intel 80C32 AMS/BASIC, 1802 ASM and 705KICS.....yeesh, that's only the ones I can name offhand....
I do have some Intel 8008s here...
one day I need to order a big bin..... |
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