Hi Danilo Yeah, I guess being a very bare metal programmer from the old 128 byte RAM days, , I dislike MALLOCs in embedded code on principal.
However, because the heap usage would be deterministic, it should be fairly safe. ******************************************************************************* Take a look at the memory management routine heap2.c in freertos.c (in fact, there are heap1,2,3,4,5 .c - a few options... try heap4, also) -this is a much smarter memory alloc and dealloc routine that is fairly cheap. much better than usual brain dead malloc. ******************************************************************************** I'd recommend using that. It looks for blocks same size, existing used etc I would expect the same improvements on the F4 as the F7 using the CMSIS library. The F7 is much faster on that sort of code. I only got rid of the FFT malloc stuff the huge stack additions are still in there and you could save 50% there ... -glen On 16/09/2016 12:06 PM, Danilo Beuche wrote: > Hi Glen, > > nice, would be interesting to see how much the STM32F4 gains by use of > CMSIS FFT routines. > > BTW, I am not sure, but I think you mentioned the removal of malloc as > one of your changes. For us with the mcHF it would not be good to have > the memory for FreeDV code statically allocated since FreeDV is just one > operation mode of the mcHF, and we need the memory at other times for > other stuff, especially since it really eats a lot of memory (in > relation to the STM32F4 RAM sizes). Even half of it is still a lot. > > Looking forward to gain some more free cycles with your work. > > Regards, > Danilo > > > Am 16.09.2016 um 03:53 schrieb glen english: >> Hi Danilo >> >> yeah, you have plenty in hand. >> >> OK so M7 and CMSIS FFT, about 2 x speed (same clock) 7.74mS (1200bps) >> for decode. >> >> On 16/09/2016 11:49 AM, Danilo Beuche wrote: >>> H >>> >>> regarding the times @mcHF (STM32F4, 168Mhz) some clarifications: We >>> measured 17.3ms per 40ms interval for the voice decode part only (this >>> is only happening once the modem is synced) and roughly 5ms of >>> fdmdv_demod per 20ms interval (happens all the time). Which gives us in >>> total some 27ms per 40ms once synced. This is about 68% load. >>> >>> Regards, >>> >>> Danilo >>> >>> >>> >>> >>> >>> ------------------------------------------------------------------------------ >>> _______________________________________________ >>> Freetel-codec2 mailing list >>> Freetel-codec2@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >>> >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> Freetel-codec2 mailing list >> Freetel-codec2@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > ------------------------------------------------------------------------------ > _______________________________________________ > Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > ------------------------------------------------------------------------------ _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
