latigid on Posted August 6, 2017 Report Posted August 6, 2017 Here's a new STM32F4 Core: It has most of the functionality of the Discovery one, but has a few improvements: USB ports are on the breakout, so there's proper USB B USB A "host" - still need to test this, but it's normally done setting the ID pin low. I've put a panel switch for selecting host/slave and there's a jumper to power the slaved device if needed. LEDs and reset button on the panel; "blue button" as a jumper a 3.5mm socket for a footswitch or gate (or for other purposes) some connectors for +5V supply direct off the USB bus 3v3 Vreg is rated at 1000mA I think the panel connectors could be distant from the Core I haven't tested the AINs, but it is possible to use an external reference. At the moment I have the breakout mounted on female headers; I suppose they could be directly soldered if extra height is needed. The JTAG and other pin headers do take up a bit of vertical height. These could be cut off if needed; the breakout pins are still there on the headers. There is a realtime clock oscillator (and caps) that I removed as they overlapped with a port. A downside compared to Discovery is that there isn't any ST-Link. This is easily overcome with a cheap ST-link clone, or even an old Discovery board could be used. At least all of the functions for a SEQ are working well. I realise that some of the cabling etc. is a bit wonky for the moment. Best, Andy 3 Quote
Zam Posted August 7, 2017 Report Posted August 7, 2017 Hello Andy Interesting !!! I come back later with questions :) Best Zam Quote
Antichambre Posted August 7, 2017 Report Posted August 7, 2017 Smart! What is the total height with interconnection plugs? Best regards Quote
latigid on Posted August 7, 2017 Author Report Posted August 7, 2017 Hello, total height seems to be about 30-35mm: So even a bit higher than the Disco version with the bottom headers; about the same without. There's not much reason to keep the panel board close to the Core, although I will do it like that for the SEQ and everything aligns nicely. I suppose the signal integrity (USB, SD) is better with shorter cables. The panel connectors are themselves quite high. Honestly, I think the only way to do it shorter height-wise would be with a dedicated STM32F4 chip on a custom PCB. With a breakout it's fairly much plug-and-play, and probably cheaper. https://eckstein-shop.de/Core407V Quote
YannickD Posted August 7, 2017 Report Posted August 7, 2017 Looking really cool, can't wait to build this. Any ETA on this or is it tested and ready? Quote
Antichambre Posted August 7, 2017 Report Posted August 7, 2017 (edited) On 07/08/2017 at 8:00 PM, latigid on said: Honestly, I think the only way to do it shorter height-wise would be with a dedicated STM32F4 chip on a custom PCB. With a breakout it's fairly much plug-and-play, and probably cheaper. I did one but never manufacture the board then never test it. It's a good way to gain space, the board is really small, but if you're not afraid about small smd components. I have to remember exactly which package I use, but same CPU, there's exactly the same port as usual, except J11 which is a 6 midi ports and USB, two tact, micro-SD on board. I can share if you want it... Best Bruno Edited January 22, 2018 by Antichambre 1 Quote
latigid on Posted August 7, 2017 Author Report Posted August 7, 2017 Bruno, looks nice! Your offer is kind, but I think it will be okay with what I have. In my experience, builders have quite some trouble even with SOIC parts, so I try to go no smaller than SOIC/1206/SOT-23. And of course THT parts when possible as they make nice jumpers! I think the Waveshare paradigm is a good one to follow as they do a lot of STM chips: http://www.waveshare.com/product/mcu-tools/stm32/core/core429i.htm F4 I (with much more IO) and 1MB SD RAM onboard http://www.waveshare.com/product/mcu-tools/stm32/core/core746i.htm F7 Core etc. Yannick, I need some weeks at least to talk with the Bavarians. I also have to prioritise giving boards out to those interested in the SEQ. But hopefully more becomes clear soon. Best, Andy Quote
Antichambre Posted August 7, 2017 Report Posted August 7, 2017 1 minute ago, latigid on said: In my experience, builders have quite some trouble even with SOIC parts Yes i know that's one of the reason i didn't share it, some soldering experience and a lot of flux paste is necessary, obviously some good equipment and tool too. 4 minutes ago, latigid on said: F4 I (with much more IO) and 1MB SD RAM onboard oh yes this is great! my OLRE16 will be happy! 5 minutes ago, latigid on said: http://www.waveshare.com/product/mcu-tools/stm32/core/core746i.htm F7 Core In PM ;) Great work! Quote
Antichambre Posted September 26, 2017 Report Posted September 26, 2017 Even the box is a solid thing! Quote
Smithy Posted September 26, 2017 Report Posted September 26, 2017 This was the aliexpress seller I mentioned a few weeks back for people wanting to save a few bucks: https://www.aliexpress.com/item/Core407V-STM32F407VET6-STM32F407-STM32-ARM-Cortex-M4-Evaluation-Development-Core-Board-with-Full-IOs/753381244.html?spm=2114.12010608.0.0.47b75a57MQkZDO Andy you were saying it would be fine to order from them if i remember correctly? Going to place an order with them if all is in order. Better sooner than later! Quote
latigid on Posted September 26, 2017 Author Report Posted September 26, 2017 I've never actually ordered anything from Aliexpr., but I know others have. The build info/parts etc. have been on the wiki for a while now: http://wiki.midibox.org/doku.php?id=wcore Looks like it's about the same to purchase through eBay (recommended over Ali). Best, Andy Quote
tedysuwarnady Posted October 19, 2017 Report Posted October 19, 2017 can i give schematic layout pcb brd file or i want to buy this one new dedicated STM32F4 chip on a custom PCB. With a breakout please Quote
tedysuwarnady Posted October 19, 2017 Report Posted October 19, 2017 On 8/7/2017 at 3:40 AM, latigid on said: can i give schematic layout pcb brd file or i want to buy this one new dedicated STM32F4 chip on a custom PCB. With a breakout please Quote
Antichambre Posted October 19, 2017 Report Posted October 19, 2017 Hi, Purple layout and picture are not the same. Purple one is a prototype and not for sale. Picture is the new one, Andy’s Design! Around Waveshare core. Best regards Quote
tedysuwarnady Posted October 26, 2017 Report Posted October 26, 2017 Andy’s Design! Around Waveshare core. what obout detail schemathis for this Quote
latigid on Posted October 26, 2017 Author Report Posted October 26, 2017 http://wiki.midibox.org/doku.php?id=wcorehttp://wiki.midibox.org/doku.php?id=wcoref4_pcb Quote
tedysuwarnady Posted October 30, 2017 Report Posted October 30, 2017 whatobout detail all of components mbhp_core_stm32f4(1).pdf Quote
latigid on Posted October 30, 2017 Author Report Posted October 30, 2017 Meh, all of the details are there if you look. Quote
Antichambre Posted January 29, 2018 Report Posted January 29, 2018 (edited) Hi everybody! I'm lucky to be able to try the first boards, thank you Andy! They work perfectly. But as I use it in development mode (all naked) I took the initiative to make a small and simple support, it keeps the boards together and protects it from a short circuit. the devPlate. I use plastic spacers to support the boards, the spacers are filed so that the cards fit inside a little bit less than 1 mm. This is the dxf file, you can use it freely:1801_wCore_devPlate_v1b.dxf Best regards Bruno Edited January 29, 2018 by Antichambre 1 Quote
Hawkeye Posted January 29, 2018 Report Posted January 29, 2018 That's really awesome and helpful during development, great job, Bruno! :) Quote
latigid on Posted January 29, 2018 Author Report Posted January 29, 2018 Looks ace, thanks for your work Bruno. Quote
slo Posted January 29, 2018 Report Posted January 29, 2018 That is very sweet & tidy.....I like it a lot! Quote
Phatline Posted January 30, 2018 Report Posted January 30, 2018 where to connect the "bootloader-mode" switch? -btw- like this small one. Quote
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