[Arm-netbook] stress! and working with libopencm3, stm32sprog and an STM32F103

[krasi gichev]

Yes, difference is that those specialized chips are fixed, non-flexible -
but ready. Yes, with FW, but those FWs are already done and tested.
Overwriting entire flash is also OK, if it is specified for 10K cycles. I
remembet the times when embedded program flash was rated for 100 cycles.

How about tracking the reason for this "interrupt-causes-a-problem"?


2013/10/20 luke.leighton <luke.leighton at gmail.com>

> On Sun, Oct 20, 2013 at 9:42 AM, krasi gichev <krasimirr at gmail.com> wrote:
> > Not sure what particulat problem this could be, but I know that "BOOT0"
> > selects the boot mode.
>
>  yes.  what i've assumed is that it's ok to just completely overwrite
> the entire flash on each dev-cycle (no flash-based usb-based
> bootloader like the one used on the leaflabs maple).  as long as i
> don't hit a flash block write-cycle limit within the development
> period it'll be ok.
>
> > About your last statement - wasn't it clear the doing things on
> general-purpose
> > MCU means trading off development resources for freedom/flexibility?
>
>  in a word, yes.  but it's been an absolute sod for hardware verification.
>  Q ODM: we want to sign off the development of the hardware!
>  A: err... you can't.  there's no firmware yet.
>  Q: well how can we test if the board we put together is correct or not
>  A: err... you' can't!
>
>  so it was a bit of a risk.
>
> > If it was easier/cheaper that why would someone the earth make
> specialized
> > chips
>
>  because it's possible with those specialised chips (USB-audio IC,
> USB-camera IC) to just... plug them in and go.  the irony is that most
> USB-camera ICs have an 8051 embedded microcontroller with on-board ROM
> or flash, and most good Audio CODEC ICs have a Tensilica DSP with
> on-board ROM or flash!
>
>  so there are companies out there selling exactly the software that's
> required to do the job, using exactly the same kind of solution, it's
> just that they're entirely proprietary and ready-to-go.  but the fact
> that these ICs have an on-board MCU/DSP means that they're going to be
> the same order of magnitude of cost.
>
>  *sigh* i'd _really_ like to use the STM32F207 with DCMI but the
> pricing out of HK is $5.50 for 10k units: nearly 20% *higher* than the
> 10k pricing off of digikey in EU/USA!  which is nuts.
>
> l.
>
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