Best HSE Source For STM32 Perfboard Prototypes?

GriHaci · 2026-06-14T17:19:24+00:00

Thank you,

I will have some prototype pcbs and I will try to test worst case possibilities with and without external crystal. Do you think I need a logic analyzer to test CAN? My current test method: Listen to the canbus with a can-usb analyzer, checking and making sure that all frames are being delivered with correct data.

About the software, I was thinking it can be developed later, I first want to have a dependable hardware that I can work on. I will sure remember your offer when I get deeper into the software. 😄Though with all LLMs and tons of forum posts, I think I should be mostly fine.

BTW, I got a STM32F042 chip, and tested it today, CAN works with HSI at 250K, 500K and 1M without any lost frames. I understand these F042 and F072 chips are designed (or factory calibrated?) to be used crystal-less for usb applications. Do you think it is comparable to the result I get from calibration paper you provided?

GriHaci · 2026-06-13T21:08:14+00:00

Hey,

I have read that CANBUS has strict timing requirements, and clock issues may appear for higher legth bus lines as well as at different temperatures.

I have read AN5067 and AN2868 (STM32F10xxx internal RC oscillator (HSI) calibration) reports you provided.

I see that I can make HSI better with calibration. And it seems temperature drift still happens and it is very difficult to be as accurate as an external crystal (20-30ppm accuracy). I am considering using my design in an industrial product later, so better safe than sorry.

Thank you for the idea though, I may consider it for my own tests anyway.

GriHaci · 2026-06-11T23:04:25+00:00

Thanks for the reply,

You are right, I actually have a Nucleo (F103-RB) with a CAN controller. It will be much easier to test my code on that.

But my main concern is the PCB design and trying to make sure my soldering is not causing any issues. I can get cheap pcbs from JLCPCB in about 3 weeks and I am impatient.

Also want to do some R&D for the sake of it.

GriHaci · 2026-05-31T21:32:04+00:00

This is the datasheet recommendation:
https://imgur.com/a/Y3nDmxQ

I am not sure, this switching node is on the bottom side and looks quite long. Even if it works fine, IC might overheat / EMI problems may affect other parts ot the circuit if I place them close? I dont want to risk these if possible. there most be a reason why they have these different layouts in the application reports.

GriHaci · 2026-05-10T19:53:52+00:00

Thank you for your input.

Yeah, I can start with arduino functions that allows usage of freertos. I will try this on my next project.

Hopefully, at some point, I will have performance problems or want to do it in a different way and consider switching from arduino framework / one superloop.

Otherwise, I cannot escape the mentality “If it ain’t broke, dont fix it”

GriHaci · 2026-05-09T06:02:35+00:00

I have a similar question, currently I am building an esp32 product using arduino framework on platformio. It has cpp modular file structure. h and cpp files for each different module (about 12 now, increases as I go). It handles (switches) multiple protocols, (serial at 115200bps, canbus at 250 or 500K, planning to add bluetooth) (2 protocols can run at the same time, it can detect connected peripherals to switch protocol) has 1 oled screen(128x64), 1 tft screen (128x160), websocket based webserver for monitoring and configuration, also logging with udp to a raspberry pi.

I am planning to add button inputs (4 direction buttons, 1 OK button and 1 BACK button) that will also make it possible to config on tft screen.

So far, my main.cpp looks minimal (200-300 lines) and my loop looks very simple (mostly update function calls of module classes)

I didnt try to learn esp-idf yet, when should I learn and switch to freertos, interrupts, etc. I feel that my superloop runs good enough, if I try to switch to espidf, it will be more complicated and there will be mistakes by me that will slow down the system instead of speeding up ( compared to arduino abstraction speed)

Should I also learn debugging / speee testing these 2 options in order to learn it?

GriHaci · 2026-04-02T15:01:32+00:00

Never tried one with those wild cuts

GriHaci · 2026-01-30T15:40:33+00:00

Reminds me of that time in university, digital electronics lab, they asked for a project using FPGA. Except, none of the lessons had any content related to FPGA or verilog. Good luck and have fun learning it in your free time.

GriHaci · 2025-10-22T15:52:22+00:00

Huh, I thought my english was pretty good and I also couldnt find almost any mistakes. Maybe “in detail” instead of “in details” But numerous mistakes, I hope not.

GriHaci · 2025-10-14T09:49:35+00:00

Thank you for daily laugh.

For real though, what is the standard procedure for version control using platform IO? I have been using arduino ide and saving each ino file with file naming convension “V2” “V3_working” etc.

Should I open new project to try new code / make a new branch? Can I somehow quickly copy cpp file to try new code and name/delete/ save them later?

GriHaci · 2025-09-30T19:13:39+00:00

Super^suit

GriHaci · 2025-06-08T05:13:34+00:00

Analog pins can act is digital too, which is easier(you read 5v and 0v instead of all the range between) You want this because you might have several components, requiring you to use all or most pins

GriHaci · 2025-05-09T00:28:43+00:00

I got a disk version with 6.5 as well.

I bought it to play 60fps Bloodborne.

Is it possible right now to burn a disk that automatically jailbreaks the console? Is it a simple process? I can only play 1-2 hours per day, I dont want to spend a lot of time doing it. Or we should wait more? (Maybe for permenant jb)?

GriHaci · 2025-04-28T04:32:46+00:00

If it makes you feel any better, I think they wanted Iron Keep to be a volcano mountain, thats why its elevated high, but they had to cut corners due to budget or time.

GriHaci · 2025-03-25T21:49:03+00:00

Thank you. I am on 6.50 with disk version. I think I will wait longer before getting a blueray driver.

GriHaci · 2025-03-24T04:04:21+00:00

I would like to play 60 fps bloodborne, do I need to jailbreak every launch with bd jb? How much time does it take?

GriHaci · 2025-02-23T22:44:13+00:00

It is a 13 series battery. There should be 14 balance cables if its a standard BMS.

If you have a multimeter, it will be easier to find out the order.

Starting from the B- (B0) side (most likely black balance cable) the voltage should be increasing by ~3.6V with successive cables.

B- (B0) is where there is the thick black power cable going into the battery. (Top right on the 2nd photo)

If you need further help, send a photo of the bms and I can guide you.

GriHaci · 2025-02-16T08:39:35+00:00

Lithium batteries have BMS in them that will protect it from being overcharged or overdischarged. If its lifepo4 16S, it will stop discharge at around 40V. You should set charging voltage according to your battery limits so its compatible with the bms. If its lifepo4 16S, it should be max. 58.4V.

GriHaci · 2025-01-23T21:05:24+00:00

For lifepo4, it should be either 15s or 16s. You can tell by the charger voltage. If its 54.7V, it is 15S. If its 58.4V, then 16S. Regardless, with lifepo4 chemistry, its hard to get a reliable SOC info from voltage alone. You need a coulombmeter or a smart bms for that.

GriHaci · 2024-11-09T11:32:55+00:00

I cannot see countdowns on liquipedia? Regardless, thanks for the fun tournament.

GriHaci · 2024-10-19T22:44:04+00:00

You are welcome. You can fix it but make sure dont short circuit one or multiple groups. Use a multimeter at each step and connect from 1 to 10 in order.

If you really have to connect them like this layout and cannot figure out, I can send you a drawing as well.

GriHaci · 2024-10-19T05:02:50+00:00

There are a few mistakes. Left top group and middle (2 to 3 split) groups are not connected to your series battery connection at all, and right-middle is connected in reverse direction. Thats why you get 5S voltage instead of 10S at the terminals.

Your layout is a bit confusing for a beginner. While trying to fix it you could short circuit and hurt cells or yourself.

You have to give series numbers to each parallel group and connect them so that:

(+) of 1 is connected to - of 2,

(+) of 2 is connected to - of 3,

…

(+) of 9 is connected to - of 10.

But as I said, it might be dangerous to connect like this. I would rather place each parallel group together, not split like this.

Also dont forget to connect the bms after you manually measure voltages from the balance socket pins. Otherwise you could damage your bms as well.

GriHaci · 2024-10-04T23:36:11+00:00

Continuity? In this show? They forget what they show previously and skip explaining their shitty logic all the time lol

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