STM32 M0 board with BLE $25

Any other STM32 based boards

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RogerClark
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Re: STM32 M0 board with BLE $25

Post by RogerClark » Tue Mar 08, 2016 9:24 pm

Small but expensive and lacks the 32khz crystal that allows it to operate in its very low power modes.

Waveshare do some slightly bigger but which has the 32khz crystal, and is a quarter of the price.

http://www.waveshare.com/product/module ... m?___SID=U

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mrburnette
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Re: STM32 M0 board with BLE $25

Post by mrburnette » Tue Mar 08, 2016 9:35 pm

Reminds me of the BASIC Stamp 1
- Ugly
- Very Ugly

Andcat $25 for an M0 uC... that's pricey!

Maybe a $6.50 inexpensive BLE and a $2.25 STM32F103C8T6 with an M3 core ... all under $10.

Unless having something very small is $15 important.

Ray

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RogerClark
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Re: STM32 M0 board with BLE $25

Post by RogerClark » Tue Mar 08, 2016 9:49 pm

Ray

Those CC2540 based modules are very limited in what you can do.

The "HM10" has more features than the one you linked to, but all of them are a pain to use, as they are controlled via Serial.

The only way to write code for the CC254x modules is using the IAR 8051 compiler, which is $$$$$$ ( because TI only release their BLE lib binaries in IAR format)

Actually, I am looking at developing for the CC254x devices at the moment, but the compiler price is a big problem, and although I downloaded the 30 day demo of IAR, I have not activated it, because Im too busy on other projects to have time to make full use of the 30 days in which to determine if its cost effective to buy the compiler.

Note. Just to be factually correct, I heard that if you approach TI and sign an NDA it may be possible to get the source for the BLE libs so that they could be compiled using an open source 8051 compiler, but I don't think this is a commercially viable option as there isnt GCC for 8051 and you would be reliant on an old unsupported compiler.

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mrburnette
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Re: STM32 M0 board with BLE $25

Post by mrburnette » Tue Mar 08, 2016 9:55 pm

RogerClark wrote:Ray

Those CC2540 based modules are very limited in what you can do.
<...>
:D
Just rattling stevech's chain :roll:

But, I do like the size of the module he linked and there is 32K SRAM, so more headroom. I used the M0 core with PSoC, adequate if one does not dream too much.

Ray

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RogerClark
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Re: STM32 M0 board with BLE $25

Post by RogerClark » Wed Mar 09, 2016 12:25 am

Its not the CC254x thats the problem, its the preflashed firmware, which is often poor quality with limited functionality

The CC254x its self is a very good chip, especially considering its using an 8051 as its core.

The key selling point for those type of modules is the price, as they are cheaper and more readily available than nRF51822 based modules.

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mrburnette
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Re: STM32 M0 board with BLE $25

Post by mrburnette » Wed Mar 09, 2016 12:34 am

Ah, ha. I'm not familiar with Bluetooth for comms on uC. But, it would seem that "buyer beware" is appropriate.

Ray

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Rintin
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Re: STM32 M0 board with BLE $25

Post by Rintin » Wed Mar 09, 2016 8:31 am

RogerClark wrote:as there isnt GCC for 8051
SDCC seems to have 8051 support. I don't know if this is an option.
#legalizeawoo

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Slammer
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Re: STM32 M0 board with BLE $25

Post by Slammer » Wed Mar 09, 2016 12:02 pm

SDCC for 8051 is working very well, not very effective like KEIL, but acceptable.
I was using SDCC some years ago for many projects.

stevech
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Re: STM32 M0 board with BLE $25

Post by stevech » Wed Mar 09, 2016 5:35 pm

mrburnette wrote:
RogerClark wrote:Ray

Those CC2540 based modules are very limited in what you can do.
<...>
:D
Just rattling stevech's chain :roll:

But, I do like the size of the module he linked and there is 32K SRAM, so more headroom. I used the M0 core with PSoC, adequate if one does not dream too much.

Ray
I'm not selling these! Geeze. Just window shopping.

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