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Re: PJRC Teensy 4.0 announced, small 600 mhz Cortex M7 board

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On 8/7/2019 6:58 PM, Paul Rubin wrote:
> In case anyone cares about this sort of thing.  I find it cool.
> 
> Teensy 4.0 is announced:
> 
>    - NXP iMXRT1062 Cortex M7 MCU, 1024k ram (512k tightly coupled,
>      i.e. on a special fast internal bus that allows 2 accesses in the
>      same cycle), 2048k flash, RNG, RTC, crypto acceleration, ports and
>      timers galore.  Includes many analog in and PWM out (no true analog
>      out), CAN, USB host, SDIO, etc.  SPDIF audio in and out.  FPU
>      supports single and double precision and has transcendentals.
> 
>    - Same form factor as Teensy 3.2 (0.7*1.4 inch), mostly compatible
>      pinout, similar price ($20).
> 
>    - Uses 100 mA current (3.3v) at 600 mhz.  Supposedly fastest
>      microcontroller available today, whatever that means.  I calculate
>      166 μA/MHz which is decent, probably beating most Cortex M4's in
>      compute efficiency because of the M7's superscalar capability.  But
>      the Ambiq M4's at 6(!) μA/MHz are in a different class of low power
>      if you don't mind 48 mhz speed.
> 
>    - more details and benchmarks: https://www.pjrc.com/store/teensy40.html
>      Also available from Adafruit which is where I first saw the
>      announcement.
> 
> In raw speed and capacity this is slower and more limited than a $5
> Raspberry Pi Zero, but it's smaller, lower powered, uses MCU-style
> programming rather than Linux, has lots of analog I/O (Raspberry has
> none), etc.  So it's better suited than the Raspberry for realtime and
> mixed signal applications.
> 
> The Pocket Beagle is bigger, more power hungry, and costs a bit more
> ($25?), but has comparable I/O and a pair of on-chip realtime
> coprocessors, so it may also be of interest.
> 
> Overall I don't have an immediate use for one of these, but I
> appreciated seeing the announcement and think it's nice to know about.
> It will be great for MicroPython and maybe overkill for Forth.
> 

Pretty nice for not much money, useful when you want bare metal and 
having to deal with the Linux overhead. I2S would be handy for 
implementing a SDR radio.


-- 

Cecil - k5nwa

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PJRC Teensy 4.0 announced, small 600 mhz Cortex M7 board Paul Rubin <no.email@nospam.invalid> - 2019-08-07 16:58 -0700
  Re: PJRC Teensy 4.0 announced, small 600 mhz Cortex M7 board Cecil - k5nwa <cbayona@cbayona.com> - 2019-08-07 23:16 -0500

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