librecube - Public Room Timeline

	librecube	259 Members
	open source space exploration: https://librecube.org/	31 Servers

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Sender	Message	Time
25 Sep 2024
mimansha09	hello! a freshman here from india! i'd be glad to help in beginner friendly projects and explore this place.	11:23:16
cajt	In reply to @artur.librecube:matrix.org @room Calling for advice on microcontrollers! Currently we use pyboards on the prototype boards for interfacing. We want to change to low cost, low power STM32 MCU, with low pin count (32 or even TSSOP20). Any recommendations? Also, there must be a Nucleo board for it available, which is supported in Platformio. What are the constraints and requirements?	12:47:08
Artur Scholz	In reply to @artur.librecube:matrix.org Also, we will now be using the wordpress newsletter plugin for the newsletter (instead of the announce mailing list). So please make sure you are subscribed here: https://librecube.org/newsletter/ @room @room Kind reminder. You not subscribe -> You not get newsletter 😭	13:57:04
Red	In reply to @mimansha09:matrix.org hello! a freshman here from india! i'd be glad to help in beginner friendly projects and explore this place. Welcome mimansha09 "beginner friendly" depends what you can do already 🙂 So what do you have some experience with: git bash python flying a spacecraft to the moon ...	14:04:11
Red	In reply to @artur.librecube:matrix.org @room Kind reminder. You not subscribe -> You not get newsletter 😭 I just accepted the link sent by email - now I an fullly in the news-let-ter !	14:16:44
cajt	If micropython is important, there are not that many stm32 with a reasonale amount of flash&ram. If C++ is fine, there are many parts in the F0 Family. Also Dual CAN I/F might be a limitation. The NUCLEO_L432KC is mentioned in the micropython repo. So is the NUCLEO_G474RE which is a bit faster, and has more memory and more than one CAN I/F.	19:44:51
ck0n3	In reply to @cajt:matrix.org If micropython is important, there are not that many stm32 with a reasonale amount of flash&ram. If C++ is fine, there are many parts in the F0 Family. Also Dual CAN I/F might be a limitation. The NUCLEO_L432KC is mentioned in the micropython repo. So is the NUCLEO_G474RE which is a bit faster, and has more memory and more than one CAN I/F. STM32G474RE is LQFP48. 48 pins > 32 pins	19:55:58
cajt	That's why I was asking for constratins and reqs., a bit of context would help. Also I don't think the 32 pins is a hard or particularly usfull criteria.	20:29:17
Artur Scholz	There is no real hard requirement. The idea is to replace the oversized pyboard with a small low-cost low-pin (handsoldering!) microcontroller. Initially I was so focused on having dual CAN support in the MCU, but actually there are very few available. So instead, an external CAN controller shall be used to offload the MCU.	20:45:52
Artur Scholz	So, I am going to buy the F031K6 Nucleo board for experimenting. In particular using the Platformio plugin (I am using Code OSS, ie. VS Code without any Microsoft telemetry).	20:47:21
Artur Scholz	If someone has experience in that, would be great to share here. Let's say, starting with a LED blinky program.	20:47:53
Artur Scholz	At some point later we will port SpaceCAN (https://gitlab.com/librecube/lib/mbed-spacecan) to that MCU.	20:48:39
Artur Scholz	Note that MBed is being stopped - I cant understand why... https://os.mbed.com/	20:49:26
Artur Scholz	So we would need another framework I guess, unless we want to write everything from ground up.	20:49:46
Artur Scholz	There is stm32cube, which already by the name sounds fitting. I have zero experience with it though...	20:50:19
cajt	modm.io is that framework	20:50:23
Artur Scholz	In reply to @cajt:matrix.org modm.io is that framework Ok cool! That is the input I am looking for :)	20:51:02
cajt	That external CAN peripheral is a huge impact on the PCB size, cost and BoM length. I'm totally aware of the limitation of needing dual CAN. We picked a multi-drop UART Bus because of that .. some time ago, for not so unsimilar application.	20:53:46
Artur Scholz	Yes, in particular since that famous MCP25625 is so huge, it's already twice the size of the MCU ! There must be alternatives.... I hope	20:55:03
cajt	.. but hey, dual 10base-t1s via some macphys would be a small step, starting from two CAN peripherals.	20:55:32
cajt	Here: STM32H523 it got 2xfdcan, <= 512kib flash, 272 Kibyte ram and some smallish pacakges: LQFP48, UFQFPN48, UFBGA100 (all 7x7mm). The WLCSP39 (2.76 x 2.78 mm, pitch 0.4mm is just too far)	21:07:42
cajt	not sure how many the layers the bga100 actually needs, but it'll require fine vias.	21:08:44
cajt	... and for those who care, it got ETM too	21:09:49
cajt	What is the target application of all of this?	21:21:24
Artur Scholz	To be used as responder nodes that are located on each board. The controller node will be raspi or beagle board or the like.	21:23:00
cajt	how patterns repeat ;-) Two things to concider: Is the redundant bus attachment actually required? Maybe redundant nodea might be a good design choice anyways, each connected to only on of the busses. UART multi-drop bus is probably an option. a single-initiator/multi-responder pattern is not too terrible to implement.	21:27:14
cajt	maybe the uavcan, opencyphal and dronecan people have similar requirements to their hardware. Might be an area to browse around.	21:33:16
26 Sep 2024
Red	* I just accepted the link sent by email - now I am fullly in the news-let-ter !	04:42:09
27 Sep 2024
Artur Scholz	Hi all! In an effort to add/update assembly guides, we are starting with an easy one, the 1U structure. Have a look; and if you can, re-build one at home and share your experience! https://gitlab.com/librecube/elements/LC2101/-/blob/main/docs/assembly/README.md?ref_type=heads	13:59:27
mimansha09	In reply to @redsharpbyte:matrix.org Welcome mimansha09 "beginner friendly" depends what you can do already 🙂 So what do you have some experience with: git bash python flying a spacecraft to the moon ... python :D	14:23:25

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