| View previous topic :: View next topic |
| Author |
Message |
Torello
Joined: 29 Sep 2006
Posts: 120
|
| getenv("BIT:EN") |
 Posted: Wed Jun 19, 2024 7:47 am |
 |
|
Hi,
The bit-name "EN" can be found in a lot of SFR
So if I declare: #bit TMR0EN = getenv("BIT:EN") . And the complier does complie this, which "EN" has been assigned?
And there are much more of these common names. like GO, ON ...
Workaround would be:
#bit TMR0EN = getenv("SFR:T0CON0").7
But the "7" could be completely wrong for an other PIC.
What is the best option for portability?
_________________
Regards, Edwin. PCWHD v5.114 |
|
 |
Ttelmah
Joined: 11 Mar 2010
Posts: 19529
|
|
| Posted: Wed Jun 19, 2024 10:11 am |
|
|
I think you have already answered yourself. Using the names is the more
portable method. Also reduces chances of errors. |
|
|
jeremiah
Joined: 20 Jul 2010
Posts: 1351
|
| Re: getenv("BIT:EN") |
| Posted: Mon Jun 24, 2024 7:30 am |
|
|
| Torello wrote: | Hi,
The bit-name "EN" can be found in a lot of SFR
So if I declare: #bit TMR0EN = getenv("BIT:EN") . And the complier does complie this, which "EN" has been assigned?
And there are much more of these common names. like GO, ON ...
Workaround would be:
#bit TMR0EN = getenv("SFR:T0CON0").7
But the "7" could be completely wrong for an other PIC.
What is the best option for portability? |
My preferred method in this case is to use the "." within the name:
EX:
| Code: |
#bit U2_TXEN = getenv("BIT:U2STA.UTXEN")
|
So your example would be:
| Code: |
#bit TMR0EN = getenv("BIT:T0CON0.EN")
|
Assuming all the names are correct.
I find this the most useful way as it would give a compiler error if either the register or the bit were named wrong or if the chip database for that micro has a bad name in it.
Last edited by jeremiah on Mon Jun 24, 2024 8:01 am; edited 1 time in total |
|
|
Ttelmah
Joined: 11 Mar 2010
Posts: 19529
|
|
| Posted: Mon Jun 24, 2024 7:33 am |
|
|
Yes, and this makes it much easier to distinguish the bits on multiple
peripherals (UART1, IART2 etc..).
Much preferred. |
|
|
Torello
Joined: 29 Sep 2006
Posts: 120
|
|
| Posted: Wed Jul 17, 2024 1:42 am |
|
|
Thanx both!
I like the below option! Diidn't know that is also possible.
#bit TMR0EN = getenv("BIT:T0CON0.EN")
_________________
Regards, Edwin. PCWHD v5.114 |
|
|
Torello
Joined: 29 Sep 2006
Posts: 120
|
|
| Posted: Mon Jul 22, 2024 1:52 am |
|
|
Mmm, too handy to be true?
For compiler 5114: | Code: | | #bit TMR0EN = getenv("BIT:T0CON0.EN") |
raises a compiler error: Expecting an identifier Bad SFR name
Tried some other variartion I could think of. Like:
| Code: | #bit TMR0EN = getenv("BIT:T0CON0:EN")
#bit TMR0EN = getenv("SFR:T0CON0.EN")
#bit TMR0EN = getenv("SFR:T0CON0.BIT:EN")
#bit TMR0EN = getenv("SFR:T0CON0,BIT:EN")
#bit TMR0EN = getenv("SFR:T0CON0:BIT:EN")
#bit TMR0EN = getenv("SFR:T0CON0 BIT:EN")
|
Nada..
Only one that works for 5114 is:
| Code: | | #bit TMR0EN = getenv("SFR:T0CON0").7 |
_________________
Regards, Edwin. PCWHD v5.114 |
|
|
jeremiah
Joined: 20 Jul 2010
Posts: 1351
|
|
| Posted: Mon Jul 22, 2024 9:19 am |
|
|
| Torello wrote: | Mmm, too handy to be true?
For compiler 5114: | Code: | | #bit TMR0EN = getenv("BIT:T0CON0.EN") |
raises a compiler error: Expecting an identifier Bad SFR name
Tried some other variartion I could think of. Like:
| Code: | #bit TMR0EN = getenv("BIT:T0CON0:EN")
#bit TMR0EN = getenv("SFR:T0CON0.EN")
#bit TMR0EN = getenv("SFR:T0CON0.BIT:EN")
#bit TMR0EN = getenv("SFR:T0CON0,BIT:EN")
#bit TMR0EN = getenv("SFR:T0CON0:BIT:EN")
#bit TMR0EN = getenv("SFR:T0CON0 BIT:EN")
|
Nada..
Only one that works for 5114 is:
| Code: | | #bit TMR0EN = getenv("SFR:T0CON0").7 |
|
Which chip is it? I know the format of the command works (I am looking at it in my code right now). But perhaps the chip database has a bug in it?
Sorry if you mentioned it before, but didn't see it, which micro are you using?
EDIT2: Try this:
| Code: |
#bit TMR1EN = getenv("BIT:T0CON0.T0EN")
|
I just looked up a few pic16 and pick18's and noticed they had duplicate entries for T0CON0 in their database. When they did then .EN didn't work but .T0EN did. Maybe your chip is similar.
See image at the bottom of the post.
EDIT1:
Here is an example that compiles for me in 5.113. It's a different chip, but just so you can see it for yourself.
| Code: |
#case
#include <24FJ1024GB610.h>
#bit TMR1EN = getenv("BIT:T1CON.TON")
void main(){
}
|
I can try your chip out if you see this in the next few hours (out for 2 weeks after that)
 |
|
|
Ttelmah
Joined: 11 Mar 2010
Posts: 19529
|
|
| Posted: Tue Jul 23, 2024 9:11 am |
|
|
Yes.
The system is a bit 'odd' here. If you look a couple of lines below, it has the
EN syntax also shown. You''d rather expect it to accept this when you
access a bit in an already named register, but require the T0EN syntax
to access the bit "on it's own", but in fact it seems to work the other way
round. Does seem to be a database fault here really!.
Anyway, that is why the poster was having problems.  |
|
|
Torello
Joined: 29 Sep 2006
Posts: 120
|
|
| Posted: Wed Jul 31, 2024 8:07 am |
|
|
Hi Jeremiah, Ttlemah,
The part is PIC18F26Q83 and with the Device Table Editor indeed the bit seems to be referenced as T0EN
So
| Code: | | #bit TMR0EN = getenv("BIT:T0CON0.T0EN") |
Now works. Thanks!
So about the Device Table Editor; I see 3 lines for T0CON0. same address, same name but different bit assingments.
 <sorry, I don't get it done to add a picture.. >
I more a less understand lines 2 and 3. 2 beeing the datasheet naming and 3 the compiler.
But then what is line 1?
_________________
Regards, Edwin. PCWHD v5.114 |
|
|
Ttelmah
Joined: 11 Mar 2010
Posts: 19529
|
|
| Posted: Thu Aug 01, 2024 3:00 am |
|
|
The multiple lines are just alternative names that can be used. However
the 'bit' selection version only works on the first line in each case.
It makes sense when you look at T1CON0 instead. It only has the first
line, which avoids 'EN' existing for the second timer. |
|
|
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
