[info] stm32f4 MPU module LQFP 100

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Re: stm32f4 MPU module LQFP 100

Post by russian » Wed Dec 21, 2016 2:18 am

I did not know about $3 ST-Link devices! I wonder how legal is them using ST firmware on these dongles?

PS: relevant article - http://www.taylorkillian.com/2013/01/re ... -from.html
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Re: stm32f4 MPU module LQFP 100

Post by russian » Wed Dec 21, 2016 5:07 am

Full wish list:
1) PA9 <> USB VBUS trace is needed to get USB functional
2) add vertical USB connector option (same as on Frankenso)
3) use stlink 5x2 header
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Re: stm32f4 MPU module LQFP 100

Post by kb1gtt » Sat Dec 24, 2016 12:13 am

Did I guess this correctly?
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sat Dec 24, 2016 1:05 am

no, SWDIO is PA13. SWCLK is PA14 is correct. Not sure why they call it SWIM but that one must be PB3 TRACESWO

Also do you think we would need to mirror the connector since their picture is probably if you look at the make pins from the bottom? Too bad it's some time till I get my device.
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sat Dec 24, 2016 1:17 am

Somehow I've missed the fact that similar thingy is available from a US seller, placed another order. Funny news is that there is another version of similarly looking device with a different pinout! But the one we've chosed seems to be more popular.
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Re: stm32f4 MPU module LQFP 100

Post by kb1gtt » Sat Dec 24, 2016 1:35 am

I think you mean IDC or header.
http://www.ebay.com/itm/New-10PCS-10-Pi ... 1411798788

Are you thinking short ribbon cable? If we put a female connector on the brain board, then you could plug the connector in directly. Something like this.
http://www.ebay.com/itm/Reliable-10PCS- ... 2437084318
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sat Dec 24, 2016 1:42 am

"key" was the keyword to get that notch

http://www.ebay.com/itm/10-Pcs-2-54mm-0 ... 1878091305
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Re: stm32f4 MPU module LQFP 100

Post by kb1gtt » Sat Dec 24, 2016 2:23 am

Is this correct?
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sat Dec 24, 2016 2:26 am

I believe your picture shows their connector and our connector would be mirrored, unless that would be taken care by the PCB or would you flip the connector and place it on the bottom of the board? The plan is to plug dongle from top.
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Re: stm32f4 MPU module LQFP 100

Post by kb1gtt » Sat Dec 24, 2016 10:10 am

I'm not sure if it's mirrored or not. I see pin 1 = reset so I made pin 1 reset, etc. Then I made the connector poke up not down on the layout. What I don't know for sure is if their pin 1 is the same pin as our pin 1. Based on the graphic which shows the key. I think our pin 1 is the same as their pin 1. So I think this is good, but I won't know for sure until we get the board and can verify. This is how it looks in the layout.
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Re: stm32f4 MPU module LQFP 100

Post by kb1gtt » Sat Dec 24, 2016 12:01 pm

Was there going to be a battery holder change on the back?
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sat Dec 24, 2016 2:44 pm

Look at the picture of the red device, pay attention at where the tab is located and where the tab is pictured on their schematics. Based on their picture I am sure we need to mirror the connector, as is it would work on the back of the board but I want it to work on top.

I am looking at my assembled LQFP 100 and LQFP 176 boards and both have battery holder soldered just fine, I think we are good with current location.
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Re: stm32f4 MPU module LQFP 100

Post by kb1gtt » Sun Dec 25, 2016 3:22 am

So how would you connect the USB? If this is to plug directly into the board, it would be hard to get the laptop connected to the USB. So it will either need an USB cable, or a ribbon cable. If it has a ribbon cable, would that ribbon cable mirror it? Would we expect they use a USB extension cable? Perhaps something like the below.

http://www.ebay.com/itm/2ft-60cm-Black- ... Sw6n5XrQ9C
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Re: stm32f4 MPU module LQFP 100

Post by kb1gtt » Sun Dec 25, 2016 12:48 pm

@russian, you got it through my thick head. The SWD is now mirrored and looks like this. It's kind of annoying because KICAD's pin 1 and the programming device's pin 1 are mirrored. But as far as I can tell this is now routed properly.
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sun Dec 25, 2016 2:09 pm

Thank you Santa! :)
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sun Jan 01, 2017 2:36 pm

8) Check if there is a chance to match discovery board reset button location
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sun Jan 15, 2017 12:35 am

Got the boards and we have a problem with vertical USB connectors - instead of slots they've produced little holes :(

Damn. Emailing oshpark support.
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Re: stm32f4 MPU module LQFP 100

Post by kb1gtt » Sun Jan 15, 2017 1:01 am

From here http://docs.oshpark.com/submitting-orde ... and-slots/
As mentioned above, there is no guarantee that this call out will produce the expected results, and the use of plated slots is discouraged.
It appears that OSHPark has some special and less standard expectations for plated slots. Even if you follow some funky rules, it's kind of a crap shoot if they happen to notice it's a plated slot.
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Re: stm32f4 MPU module LQFP 100

Post by kb1gtt » Sun Jan 15, 2017 1:21 am

As well, even if you follow the odd OSHPark rule(s), and you happen to have a slot that's less than 40mils wide, you still get drilled holes instead of a slot. In our case the slot is 20mil wide, and making the slot 20mils wider is a problem. See the original below. I'm not sure that OSHPark can MFG this board. Either that or we have to commit to either horizontal USB or vertical USB, but it appears we can't get both from OSHPark.
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sun Jan 15, 2017 1:23 am

discovery: button center is 27.5mm above lowest 25x2 pad hole center
discovery: 24mm between button centers

brain 0.2: button center is 24mm above lowerst 25x2 hole center
brain 0.2: 17.5mm between button centers

on the brain board, can we lift buttons 3.5mm higher?
on the brain board, can we place the buttons 6.5mm futher apart?

we only need oshpart for prototyping. I am planning to snip these stands off the connector and see how good it would hold with just the five vertical terminals
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Re: stm32f4 MPU module LQFP 100

Post by kb1gtt » Sun Jan 15, 2017 1:30 am

Per the below thread, OSHPark is aware that slots use a G85 command, and as of 2015 they were working on flagging this issue. However apparently that has not happened yet. See the drill file, which includes the G85 commands. Yet you got no warnings about this problem. This issue could be easily programically checked for and could easily prevent bad productions. I do not know why this is not part of the Dynamic Rule Checking (DRC). It's a simple items to check for when compared to the other stuff they do check for.

https://forum.kicad.info/t/oval-pads-no ... park/835/5
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sun Jan 15, 2017 2:36 pm

Another drilling issue - see how red Frankenso five holes are the right size while brainboard board five holes are smaller?
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Re: stm32f4 MPU module LQFP 100

Post by kb1gtt » Sun Jan 15, 2017 3:25 pm

Can you measure your wire lead?

I see Frankenso R0.4 has the drill at 0.015, same for the OSHPark. So I expect them to be the same. Is the fat-est part of your lead 0.015in? It's possible that the Chinese board used the 0.15 as the finish diameter, and that OSHPark used it as the drill, such that plating makes it smaller.

As far as I can tell, these hole diameters should have been the same.
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sun Jan 15, 2017 9:06 pm

Why so small pads for D5 and else Ds?
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Re: stm32f4 MPU module LQFP 100

Post by russian » Sat Jan 21, 2017 8:34 pm

Getting closer to reality! With the SD grand-daughter board we will have logs and tuning access via the top plastic cover.
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Re: stm32f4 MPU module LQFP 100

Post by sleepingAwake » Sat Jan 21, 2017 8:52 pm

This is relevant to my interests.

Can we put the the MCU right on Frankenso 0.4? I was wondering if i could just take off the discovery board and installmit right on the main board.

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Re: stm32f4 MPU module LQFP 100

Post by russian » Sat Jan 21, 2017 8:55 pm

sleepingAwake wrote:Can we put the the MCU right on Frankenso 0.4? I was wondering if i could just take off the discovery board and installmit right on the main board.
This was done. Once. Two years ago :)
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Re: stm32f4 MPU module LQFP 100

Post by tomiata » Sat Jan 21, 2017 9:49 pm

russian wrote:Getting closer to reality! With the SD grand-daughter board we will have logs and tuning access via the top plastic cover.
Where can I get one those SD card thingies, and how does it connect to the board?

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Re: stm32f4 MPU module LQFP 100

Post by russian » Sat Jan 21, 2017 9:59 pm

tomiata wrote:Where can I get one those SD card thingies, and how does it connect to the board?
Pictures coming very soon. Granddaughter board only works with rusEfi own brain board (not discovery), but actually now that you ask we can make a little adapter board for the SD card granddaughter board.
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Re: stm32f4 MPU module LQFP 100

Post by sleepingAwake » Sat Jan 21, 2017 10:30 pm

russian wrote:
sleepingAwake wrote:Can we put the the MCU right on Frankenso 0.4? I was wondering if i could just take off the discovery board and installmit right on the main board.
This was done. Once. Two years ago :)

Anyone reason it wasnt pursued further?

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