STM32F207ZG?

Any other STM32 based boards
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mrmonteith
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STM32F207ZG?

Post by mrmonteith » Tue Nov 10, 2015 2:47 pm

I've been using the stm32f103c8t6 as they are dirt cheap. But I ran across this new baby.:
Image
STM32F207ZG module HY-STM32F2xxCore144 Core/Dev Board
It runs about $38 but lots of power and plenty of features to never get bored. lol

I wonder if there is any interest in this? I thought I'd share it at least.

Michael

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Re: STM32F207ZG?

Post by mrburnette » Tue Nov 10, 2015 4:13 pm

mrmonteith wrote: <...>
STM32F207ZG module HY-STM32F2xxCore144 Core/Dev Board
STM32F207ZG High-performance ARM Cortex-M3 MCU with 1 Mbyte Flash, 120 MHz CPU, ART Accelerator, Ethernet
... enhanced I/Os and peripherals connected to two APB buses, three AHB buses and a 32-bit multi-AHB bus matrix.
All devices offer three 12-bit ADCs, two DACs, a low-power RTC, twelve general-purpose 16-bit timers including two PWM timers for motor control, two general-purpose 32-bit timers. a true number random generator (RNG).
$38 USD
http://www.ebay.com/itm/STM32F207ZG-mod ... 0874320152
32-bit ARM Cortex M3 core processor, running at 120 MHz(150DMIPS) with 1MB flash and 128KB RAM
I am certain some will find it interesting. But from what I can see, there is no F2 support in the current github core:
https://github.com/rogerclarkmelbourne/Arduino_STM32


BUT I am a $4 F103 kind of dude and when I see $38 all I can think about is $38/4 = 9.5 Maple Mini's .... :lol:


Ray

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Re: STM32F207ZG?

Post by RogerClark » Tue Nov 10, 2015 8:08 pm

Ray is correct

We dont support the F2 at all with the libmaple core.
I think initially that Leaflabs did start building F2 support into the F1 core, but I think there are too many differences in the hardware to make that option viable.

You could roll your own version of the HALMX core, but it doesnt have any libraries, as its still at alpha stage ( and on hold due to lack of human resources to continue dev)

I suspect at $38 you could find a comparable F4 based board.

Or depending on you needs, a bigger F103 base board, like the F103ZET or even F103ZGT

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Re: STM32F207ZG?

Post by mrmonteith » Tue Nov 10, 2015 8:27 pm

I'm using the STM32F103C8T6 at $3.92. Much cheaper and they could just send them to me.

Well I may end up needing a few extras such as D/A. I have the 103ZE on my saved collection. Plus I may need the 32-bit timers. So Maple Mini doesn't compare here. lol I'm going to be using them in signal processing and RF work. For now I still have lots of tests to do to see what my limits are. I'm kind of keeping track of the different ones in my collection tool on e-bay until I get a better idea before I spend any money like that.
http://www.ebay.com/cln/mrmonteith/stm3 ... 7847404010

Thanks for the feedback on the F2 not supported here. Since I'm using the F103 already and it works great I'd rather stick with libraries that work nicely.

Michael

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Re: STM32F207ZG?

Post by RogerClark » Tue Nov 10, 2015 8:55 pm

Michael

If you need to do signal processing, I suspect you will need to use the F4 as it has hardware FPU, (albeit possibly only single precision)

I have seen F407Z boards on TaoBao for quite cheap prices.

e.g.

http://world.taobao.com/item/5232593899 ... 0.0.s1CAlx

Which seems to be $8 at current exchange rates. (Seems an unbelievable price)

But there are others at around $16

F4 support is not as extensive as F103, but ist not too bad.

There are a few people on the forum, like @martinayoette who use the F4 core and don't have any serious problems

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Re: STM32F207ZG?

Post by mrmonteith » Tue Nov 10, 2015 9:37 pm

Thanks all. That helps. I love the work everyone has done. Sure makes my life easier.

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Re: STM32F207ZG?

Post by stevech » Wed Nov 11, 2015 5:33 pm

I see lots here from folks struggling to get a serial port bootloader for the STM32F1xx.
Just a suggestion: The MCUs a step or more up have a bootloader in ROM on the chip. The
$8 STM32F4 board linked to below has a bootloader that can use serial, USB, SPI and IIRC, CAN.
And lots of flash, RAM and hardware floating point.

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Re: STM32F207ZG?

Post by mrmonteith » Thu Nov 19, 2015 3:42 pm

I left a message with @martinayotte about support for the last 3 on my E-Bay collection and what they're using. I mean if the support looks good, for the price I can hardly pass it up. Between processing and features it's unlikely to run out of either. lol

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Re: STM32F207ZG?

Post by martinayotte » Thu Nov 19, 2015 4:57 pm

Yes, I've reply to Micheal's PM, I suggested the STM32F407-DISCO, which should likely run stm32duino sketch easily since F407 are almost the same as F405 that I'm using, and since all DISCO boards have ST-Link built-in, it should ease development.

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