Re: [fpc-pascal] AVR Busy Wait implementation

Am 24.01.2016 um 00:00 schrieb Simon Ameis: > Would it be possible to issue a hint why a procedure can't be inlined at > a specific call? > This could change with the compiler and the user knows what to change > for inlining. The compiler tries to do this as debug info (-vd), see also

Re: [fpc-pascal] AVR Busy Wait implementation

On Sa, 2016-01-23 at 11:53 +0100, Florian Klaempfl wrote: > IMO the only proper solution is to implement delaying as compiler > intrinsics as it is done by gcc as well. Besides using a hardware timer on embedded platforms. Older µC like AVR do not have too much hardware timers, but modern ones

Re: [fpc-pascal] AVR Busy Wait implementation

Am 18.01.2016 um 23:04 schrieb Simon Ameis: > Thanks for the hint! I've had declared delay_loop_1 and delay_loop_2 > just inside the implementation section. > > Maybe these points should be added to documentation for inlining? I am against documenting this: - inline is only a hint to the

Re: [fpc-pascal] AVR Busy Wait implementation

Am 23.01.2016 um 14:17 schrieb Marc Santhoff: > On Sa, 2016-01-23 at 11:53 +0100, Florian Klaempfl wrote: > >> IMO the only proper solution is to implement delaying as compiler >> intrinsics as it is done by gcc as well. > > Besides using a hardware timer on embedded platforms. Older µC like AVR

Re: [fpc-pascal] AVR Busy Wait implementation

Would it be possible to issue a hint why a procedure can't be inlined at a specific call? This could change with the compiler and the user knows what to change for inlining. Where do I find documentation/examples on how to define a compiler intrinsic procedure? Am 23.01.2016 um 11:53 schrieb

Re: [fpc-pascal] AVR Busy Wait implementation

Thanks for the hint! I've had declared delay_loop_1 and delay_loop_2 just inside the implementation section. Maybe these points should be added to documentation for inlining? - assembler procecedure currently can't be inlined (may change) - all procedures called by the procedure and all types

Re: [fpc-pascal] AVR Busy Wait implementation

Am 17.01.2016 um 22:01 schrieb Simon Ameis: > I've now come up with the code below. > > The main problem is, that FPC doesn't inline the procedure _delay_ms. > Thus the calculation of the required ticks is done at runtime wich > timing is merely unpredictable. > > What must be done to get this

Re: [fpc-pascal] AVR Busy Wait implementation

I've now come up with the code below. The main problem is, that FPC doesn't inline the procedure _delay_ms. Thus the calculation of the required ticks is done at runtime wich timing is merely unpredictable. What must be done to get this procedure inlined? The documentation isn't very extensive

Re: [fpc-pascal] AVR Busy Wait implementation

On 01/17/2016 11:15 PM, Florian Klämpfl wrote: Am 17.01.2016 um 22:01 schrieb Simon Ameis: I've now come up with the code below. The main problem is, that FPC doesn't inline the procedure _delay_ms. Thus the calculation of the required ticks is done at runtime wich timing is merely

Re: [fpc-pascal] AVR Busy Wait implementation

On Sa, 2016-01-16 at 01:26 +0100, Simon Ameis wrote: > Am 14.01.2016 um 23:57 schrieb Marc Santhoff: > > On Do, 2016-01-14 at 21:33 +0100, Simon Ameis wrote: > >> In general I already know these documents; what I'm looking for is an > >> implementation of a busy wait, not how to use it. > >> For

Re: [fpc-pascal] AVR Busy Wait implementation

On 01/15/2016 07:48 AM, Christo Crause wrote: The focus of the code is to get accurate delays down to a few cpu cycles. This is impossible when running in any normal OS.(Of course you can run an fpc project "bare bone" without an OS), -Michael ___

Re: [fpc-pascal] AVR Busy Wait implementation

The Linux sleep system call provides a microsecond "busy" wait ,but only when used with root privilege . -Michael ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal

Re: [fpc-pascal] AVR Busy Wait implementation

On Fr, 2016-01-15 at 12:55 +0100, Michael Schnell wrote: > On 01/15/2016 07:48 AM, Christo Crause wrote: > > > > The focus of the code is to get accurate delays down to a few cpu cycles. > > > This is impossible when running in any normal OS.(Of course you can run > an fpc project "bare bone"

Re: [fpc-pascal] AVR Busy Wait implementation

Am 15.01.2016 18:10 schrieb "Michael Schnell" : > > On 01/15/2016 07:48 AM, Christo Crause wrote: >> >> >> The focus of the code is to get accurate delays down to a few cpu cycles. >> > This is impossible when running in any normal OS.(Of course you can run an fpc project "bare

Re: [fpc-pascal] AVR Busy Wait implementation

Am 14.01.2016 um 23:57 schrieb Marc Santhoff: > On Do, 2016-01-14 at 21:33 +0100, Simon Ameis wrote: >> In general I already know these documents; what I'm looking for is an >> implementation of a busy wait, not how to use it. >> For C/C++ it's easy to get the code files. But I don't know where to

Re: [fpc-pascal] AVR Busy Wait implementation

Am 15.01.2016 um 10:38 schrieb Michael Schnell: > The Linux sleep system call provides a microsecond "busy" wait ,but > only when used with root privilege . Nice to know, but I asked for an AVR implementation. Although I've seen a report describing an ARM emulation on AVR running Linux I don't

Re: [fpc-pascal] AVR Busy Wait implementation

On Do, 2016-01-14 at 21:33 +0100, Simon Ameis wrote: > In general I already know these documents; what I'm looking for is an > implementation of a busy wait, not how to use it. > For C/C++ it's easy to get the code files. But I don't know where to get > compiler built-in procedures for gcc or

Re: [fpc-pascal] AVR Busy Wait implementation

There is a lot of useful information in avr-gcc code, once you can see past the peculiarities of C. See the implementation of avr-gcc's delay here: cvs.savannah.gnu.org/viewvc/avr-libc/include/util/delay.h and delay_basic.h in the same folder. Basically they use op codes with fixed cpu cycles to

Re: [fpc-pascal] AVR Busy Wait implementation

In general I already know these documents; what I'm looking for is an implementation of a busy wait, not how to use it. For C/C++ it's easy to get the code files. But I don't know where to get compiler built-in procedures for gcc or other language's compilers. The algorithm itself isn't that

Re: [fpc-pascal] AVR Busy Wait implementation

On Mo, 2016-01-11 at 23:19 +0100, Simon Ameis wrote: > Hello, > > has anyone already written a busy wait procedure for AVR or any other > embedded processors? > I'm currently facing issues converting Arduino's calculation of time > (millisecons/microseconds) to cpu cycles as they rely on compile