librae8226
Member
Hey brilliant guys,
NuttX is a very cool RTOS for *nix enthusiasts.
http://nuttx.org
I would like to port it on maple/mini.
Here some of the work has been done:
https://github.com/librae8226/nuttx-git/tree/leach
"leach (mini)" is just a board name, it is a 2-layer designed board based on maple-mini. It can be downloaded at:
https://github.com/LeafGrass/Maple-mini-r2-evolution-board.
Any suggestion or just saying hello could be meaningful :)
Thanks,
Librae
gbulmer
Moderator
librae8226 - Thank you for sharing information about NuttX. That has an amazing list of features.
I for one would be very interested to understand your experience using it. Approximately how much space does it consume?
Do the ports to Cortex-M3 use the ARM CMSIS device libraries, or are they all specific ports to peripherals for NuttX?
AFAICT the board is:
http://www.ebay.com/itm/AC016-MAPLE-Mini-Nano-STM32F103CB-ARM-Cortex-M3-Support-Arduino-Maple-IDE-/121151457560
or
http://www.ebay.com/itm/WVTEK-MAPLE-Mini-Nano-STM32F103CB-ARM-Cortex-M3-Support-Arduino-Maple-IDE-/121151934997
Is that correct?
It looks like the original Maple-mini electronic schematic, on a two layer board. It looks very good.
Thank you very much for sharing this. I am always delighted to learn from other peoples designs.
My comments are:
1. Four analogue inputs (8-11) run under the crystal. I'd be a little concerned about noise. Have you done any noise measurements?
2. It uses double sided SMD construction, which some of us have been avoiding to enable easier DIY assembly.
3. It uses 0402 components, which are challenging for DIY assembly. I aim for much larger part size.
4. It has quite tight copper to board edge (dimension) clearance. I have heard horror stories about debugging boards with tiny filaments of copper, caused by too small dimension clearance, shorting tracks. So I would be nervous about that. Would you share with us which PCB manufacturer you use?
Some of use have departed from the original schematic to improve several aspects of the original LeafLabs Maple mini, while remaining pin or signal compatible.
The ideas for improvements are mentioned on several threads, but the most recent thread is:
http://forums.leaflabs.com/topic.php?id=10410
For example, a repo for some of the boards that implement improvements are at:
https://github.com/gbulmer/openstm32hw
or
https://github.com/siy/openstm32hw
Improvements include, for example:
- Electrostatic discharge (ESD) protection on the USB socket, protecting the host PC when the board is plugged in, and the board when its not,
- 'Beefier' power supply, because several people have reported 'smoking' the Maple-mini regulators
- Easier DIY
Siy has released several designs, including single-sided PCB's, which are well-worth investigating. Also, my orone-mini has been made successfully by other people, including Ventosus who has very helpfully published details of ADC noise testing.
Once again, thank you very much for sharing.
(Full disclosure: I am not a member of LeafLabs staff)
As an aside there appears to be a Maple Bacon board at:
http://www.ebay.com/itm/WVTEK-MAPLE-Mini-R3-STM32F103CB-ARM-Cortex-M3-Bootloader-Ready-For-Arduino-IDE-/121105162285?pt=Vintage_Electronics_R2&hash=item1c326e202d
librae8226
Member
Hello gbulmer,
Your comment is *really* detailed, it is so cool that you can give us so many suggestions. Thank you a lot!
1. Approximately how much space does it consume?
- Less than 6k ram for running a NuttShell example. And less than 8k for a USB console NuttShell example. Say "less than", because I turned on some extra features that is not essential for running the NuttX kernel.
2. Do the ports to Cortex-M3 use the ARM CMSIS device libraries, or are they all specific ports to peripherals for NuttX?
- It does not use CMSIS. NuttX supports these stuffs in its own way.
3. The boards on "ebay".
- Frankly speaking, I don't know when & how this board goes to ebay.... Anyway, it's fine to be there at least people thought it is valuable in some point of view.
4. Have you done any noise measurements?
- Not really, just used it to run some rtos, didn't meet any related issues. But I agree with you and there could be some problem if facing some high frequency applications.
5. Would you share with us which PCB manufacturer you use?
- A small manufacturer in Shenzhen, China. In fact, at our very first start, we designed this two layer board just for a lower price, compared with a four layer one.
librae8226
Member
Hi guys,
I've been working on this for some time, and finally, the maple board porting has been involved into NuttX mainline. And here great appreciates for Greg, owner of NuttX.
We can now checkout NuttX code and see it in the release "nuttx-6.30".
Browse NuttX code:
http://sourceforge.net/p/nuttx/git/ci/master/tree
Maple porting commit:
http://sourceforge.net/p/nuttx/git/ci/c33ff64a29d5dcb9893cc0a93680628c73b50bb2
A brief introduction to this commit:
1. Two examples: nsh & usbnsh. Both running NuttShell application, and the former one uses USART for console and the latter one uses USB CDC/ACM.
2. We can use maple bootloader to download the nuttx.bin built from nuttx source tree.
Thanks,
Librae
denis4inet
Member
@librae8226, I flashed latest nuttx using contributed by you maple sample config with small changes "maple/usbnsh" (http://pastebin.com/7DTsw1Xn). But USB still doesn't work.
Host system: ArchLnux x64. lsusb and dmesg hasn't any information about new USB device. I'm slightly familiar with the usb programming. But several years ago I was playing with libusb. But it is all my experience which is connected with USB.
Could you help me?!
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