Re: [EE] New projects on Github

Hi Isaac,

I understand.  The do{;} while(0) is neat. Thankyou for taking the time.

Cheers Justin






On Thu, Feb 13, 2025 at 10:11 PM Isaac Marino Bavaresco <
[email protected]> wrote:

> Hi Justin!
>
>
> Em 13/02/2025 10:28, Justin Richards escreveu:
> > Hi Isaac,
> >
> > Thanks for sharing.
> >
> > Always on the lookout for other people's code to learn from  Yours
> > certainly is a level up for me. So naturally I have many questions but
> will
> > keep it short.
> >
> > Snip from Co-Routines/Source/CoRoutines.h
> > #else /* defined ARDUINO */
> > #include <xc.h>
> > #define DISABLEINTERRUPT() do{INTCONbits.GIE=0;}while(0)
> > #define ENABLEINTERRUPT() do{INTCONbits.GIE=1;}while(0)
> > #define CLEARWATCHDOG() CLRWDT()
> > tickcount_t GetTickCount( void );
> > #endif /* defined ARDUINO */*
>
> > 1.I am guessing The first line should read /*defined PIC */
>
>
> I put in the #else's and #endif's comment the same condition as in the
> #if so it is easy to identify to which #if they belong, not what
> condition it would represent.
>
> I do it that way because often some blocks of code take several pages
> and can have a lot of nested #ifs and it is more important to know to
> what #if the #else is subordinated than the condition it represents.
>
> Each #elif obviously needs its own condition.
>
> If the #else or #elif follows another #elif, then I put in the comment
> the condition of the previous #elif. The #endif always takes the comment
> of the initial #if.
>
>
> > 2. 3rd and 4th lines - are the do ()while(0) a way to make the macros
> look
> > function like so it is consistent across platforms.
>
> It is a necessity created by C's syntax. The semicolon signals the end
> of an statement, but a bracketed block ends with the close-brace. For
> instance:
>
> #define SomeMacro()    some_statement;another_statement
> ...
> if( some_condition )  SomeMacro();
>
> Is *WRONG* because it will produce: "if( some_condition )
> some_statement;another_statement;" and "another_statement" is not inside
> the 'if'.
>
>
> #define SomeMacro()    {some_statement;another_statement;}
> ...
> if( some_condition )  SomeMacro();
>
> Works OK, produces: "if( some_condition )
> {some_statement;another_statement;};"
>
> *BUT*:
>
> if( some_condition )
>      SomeMacro();
> else
>      one_more_statement;
>
> Will produce:
>
> if( some_condition )
>      {some_statement;another_statement;};  // <<<=== *ERROR*
> else        // <<<=== dangling 'else'
>      one_more_statement;
>
> The bracketed block ends at the '}', but there is an extra semicolon
> that ends the entire 'if' statement making the 'else' becoming orphaned.
>
> *BUT*:
>
> #define SomeMacro()    do{some_statement;another_statement;}while(0)
> Works OK in every situation, because it produces:
>
> if( some_condition )
>      do{some_statement;another_statement;}while(0);    // <<<=== now the
> semicolon ends the 'do/while' statement, not the 'if'
> else
>      one_more_statement;
>
>
> Cheers,
>
> Isaac
>
>
> >
> > Or perhaps you did what you did because the following would not work. If
> > so, I  just cant work out why.
> > #if         defined ARDUINO
> > ...
> >      #define DISABLEINTERRUPT noInterrupts()
> > ...
> > #elif       defined AVR
> > ...
> >      #define DISABLEINTERRUPT asm("cli")
> > ...
> > #else   /*  defined PIC */
> > ...
> >      #define DISABLEINTERRUPT INTCONbits.GIE=0...
> > ...
> > There are many other lines of your code that are intriguing but I will
> try
> > to puzzle them out.
> >
> > Thanks again.
> > justin
> >
> > On Thu, Feb 13, 2025 at 8:07 PM Isaac M. Bavaresco <
> [email protected]>
> > wrote:
> >
> >>   Dear All,
> >>
> >>
> >> I published some more projects on Github, perhaps some may be of
> interest
> >> to the members of the list.
> >>
> >> <https://github.com/Ibavaresco> <https://github.com/Ibavaresco>
> >>
> >> A few of them I simply copied from my Piclist page, others are being
> >> published now for the first time.
> >>
> >> Cheers,
> >>
> >> Isaac
> >>
> >>
> >> Their descriptions are as follow:
> >>
> >> PCADSch2KiCAD
> >> Program to convert ASCII P-CAD 2006 Schematics to KiCAD v8.0 format. It
> can
> >> also output P-CAD format with all the fields sorted.
> >>
> >> BCDFloat
> >> Routines to implement calculations with very long floating-point
> numbers in
> >> BCD format. Not particularly efficient but good for didactical purposes.
> >>
> >> Co-Routines
> >> A simple co-routines framework
> >>
> >> SimpleRTOS
> >> RTOS for microcrontrollers
> >>
> >> LCD-HD44780
> >> Routines to interface microcrontrollers to LCD modules based on the
> HD44780
> >> and HD44780U controller
> >>
> >> HX711
> >> Routines to interface microcrontrollers to the HX711 24-bit differential
> >> ADC
> >>
> >> OneWire
> >> Routines to interface microcrontrollers to 1-Wire (iButton) devices
> >>
> >> wxSimCM0
> >> Simulator for a generic ARM Cortex-M0 processor with a few onboard
> >> peripherals - Work in progress
> >>
> >> wxCesar
> >> Simulator for the abstract computer 'Cesar'
> >> <https://www.inf.ufrgs.br/arq/wiki/doku.php?id=cesar>
> >> <https://www.inf.ufrgs.br/arq/wiki/doku.php?id=cesar>
> >>
> >> NewFATFS
> >> POSIX and NewLib compatible FAT filesystem based on Chan's FatFs
> >>
> >> FileSystem
> >> Simple FLASH file system for embedded systems. This implementation is
> for
> >> PIC18F87J60 and AT45DB642D.
> >>
> >> <
> >>
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