[sdiy] Freescale Kinetis K2 Arm Cortex M4: 120MHz, FPU & I2S DAC/ADC interface

Tue Sep 16 05:08:26 CEST 2014

Hi Jay,

Thank you for your reply.

options, that is the key here.

For most of us we want to prototype up a board and BGA devices do make it a bit harder to do v.s. TQFP etc.

Compilers are rapidly becoming near free from IAR, Keil, Freescale based on certain memory sizes of course.

I agree, tools are a concern as are the debugging/JTAG parts of the puzzle.

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=CW-MCU10

http://www.keil.com

http://www.keil.com/pr/article/1266.htm

http://supp.iar.com/Download/SW/?item=EWARM-KS32

and so forth.

I hope this helps a little bit.

regards,

Terry
On Sep 15, 2014, at 7:27 PM, Jay Schwichtenberg <jays at aracnet.com> wrote:

> As Terry said in a lot of cases there are a number of options from a number
> of vendors. For my home projects lately I've been using mostly the MicroChip
> products. Right now I'm really interested in the PIC32MZ product line (I2S
> and 512KB RAM).
> 
> But for me the home stuff has to meet the criteria of:
> 
> Functionality - Does it do what I want.
> What can I buy from Mouser or Digikey? - If I can't buy it I can't use it.
> Can I get it in a package I can solder? - I stick with the SOP, TSOP type
> packages. I can't do BGA which a lot of the higher end chips use which is
> too bad.
> Are there good free SW tools for development? - Don't have the budget for
> expensive tools.
> 
> At work we've been using the Kinetis KL02 and KL16. But I can't solder the
> KL02 20 pin BGA that's about 1/8 square and afford the IAR compiler we use.
> 
> Happy coding.
> Jay S.
> 
> 
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Terry Shultz
> Sent: Monday, September 15, 2014 10:03 AM
> To: Robin Whittle
> Cc: Sdiy
> Subject: Re: [sdiy] Freescale Kinetis K2 Arm Cortex M4: 120MHz, FPU & I2S
> DAC/ADC interface
> 
> Hi Robin,
> 
> I see that Freescale have Kinetis "K" Series in various flavors up to 150
> MHz. and mention on their web page 180 MHz parts.
> 
> These devices ave SSi ports which are I2S and have Network/TDM and single
> ended I2S support.
> 
> These SSI ports are subsets of the DSP5637x series of Audio DSP and i.MX
> series.
> 
> I am betting that Ti and others are very similar.
> 
> What point is a ST superior over Freescale , Ti, etc.?
> 
> What we need is a Matrix of all the similar devices based on Memory, I/O.
> Speed, Cost, and footprint.
> 
> It not so obvious that one Cortex M4 is better than another. 
> 
> I have a great deal of experience with the Freescale devices as a previous
> employee of Freescale/ Motorola for almost 28 years.
> 
> I have a great deal of ARM based hardware from Freescale competitors and it
> all blurs a bit on who is best.
> 
> App notes and low-cost boards are not a sign of superior performance. I like
> to see us put our heads together and build a superior
> Arduino Audio platform that support more than stereo I/O.
> 
> Contact me off line if you wish to collaborate on a call . I would like to
> see your point of view before I go into a online dialog.
> 
> best regards,
> 
> Terry Shultz
> 
> thx1138 at earthlink.net
> On Sep 11, 2014, at 9:33 PM, Robin Whittle <rw at firstpr.com.au> wrote:
> 
>> Hi Noah,
>> 
>> Thanks for this information.  This has been a most interesting discussion.
>> 
>> The ST chips go to 180MHz and have dual I2S interfaces, including in
>> LQFP-100 packages.  For instance:
>> 
>> http://www.st.com/web/en/catalog/mmc/FM141/SC1169/SS1577/LN1789
>> 
>> with 256kB RAM and 1024kB or 2048kB FLASH.  This is superior to the
>> Freescale and Infineon chips I mentioned in earlier messages.
>> 
>> I tried accessing your page:
>> 
>> 
> https://drive.google.com/folderview?id=0B27wuPBwl_tbSGdkcGhtR1RiLVE&usp=shar
> ing
>> 
>> and even with a Google login, I had to request permission to view it,
>> which will supposedly come by email.
>> 
>> I haven't yet looked at the TI DSPs:
>> 
>> http://www.ti.com/lsds/ti/dsp/overview.page
>> 
>> I think TI's Arm Cortex M4 chips do not have either FPUs or I2S
>> interfaces.
>> 
>> 
>> - Robin
>> 
>> 
>> 
>> 
>> On 2014/09/12 12:23 AM, nvawter wrote:
>>> 
>>>> I don't know what the typical instruction cycle time of the Cortex M4
>>>> is, but if the MIPS and FLOPS is anything like the 120MHz clock
>>>> frequency, they would be able to do a great deal of work per audio
>>>> sample cycle.
>>> 
>>> 
>>> Kinetis vs. ST Cortex M4 is an area of interest for me.  The stm32f4 has
>>> been a favorite chip of
>>> mine for the last year and a half.  I've been documenting tons of
>>> information
>>> and demos with a slant toward music on it on my little website: 
>>> http://diydsp.com/livesite/pages/stm32f4
>>> 
>>> I've also developed a credit-card-sized Music-Optimized Breakout Board
>>> (MOBB) for it.  It works great in numerous
>>> instruments I've built, but could still be improved.  If anyone is
>>> interested in helping me with the DAC output filter
>>> or the analog noise reduction or getting one, please click this link to
>>> see my MOBB from my google drive
>>> (you don't need a google account):
>>> 
> https://drive.google.com/folderview?id=0B27wuPBwl_tbSGdkcGhtR1RiLVE&usp=shar
> ing
>>> 
>>> 
>>> Now onto the instruction times of the Cortex M4F!!
>>> (F = M4 w/ FPU, but is not consistently used)
>>> 
>>> Here are the highlights for the FPU, 32-bit floats:
>>> 
>>> Cycles, Operation
>>> 1, abs
>>> 1, add/sub
>>> 1, compare
>>> 1, convert int<->fixed<->float<->half precision
>>> 14, divide (you knew this would suck!)
>>> 1, multiply (heck, ya!)
>>> 3, mac (multiply and accumulate/subtract)
>>> 3, fused multiply and add
>>> 14, square root (a nice bonus)
>>> sin/cos/tan/etc not implemented
>>> There is also a 1 cycle load/store time associated with moving the
>>> values to/fro FPU registers.  (so you
>>> want to keep values hanging out in the 32x 32-bit FPU register file if
>>> at all possible.)
>>> If anyone is unfamiliar with fused multiply and add, it increases
>>> accuracy over doing a separate multiply and add.
>>> 
>>> Those numbers are from this doc which has the M4F cycle times:
>>> 
> http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0439b/CHDDIGA
> C.html
>>> 
>>> 
>>> 
>>> iiuc, several vendors such as ST put an "ARD" aka instruction cache
>>> in front for the slow flash so they can clock the core at up to 168 MHz.
>>> (some folks have overclocked to 250!)
>>> Many parts running at e.g. 72 MHz were really just limited by the flash
>>> instruction fetch iiuc.  I'm glad to see Kinetis reach 120 MHz.  Do you
>>> know if they're
>>> using a cache or if the core is @120 MHz.  Also, I couldn't find the
>>> specs on the A/D and D/A
>>> on the Kinetis chips.
>>> 
>>> -Noah
>>> 
>>> 
>>> _______________________________________________
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>>> Synth-diy at dropmix.xs4all.nl
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