P2D2 with P2-revB - taking orders!

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  • I'm thinking I will supply standard height female socket headers loose by default but I can solder them on if requested.

    I think that approach does make the most sense. I only know that I would definately want headers, but not yet sure whether male or female?

    Most small dev boards seem to come with loose male pin headers, which you often you want to solder pointing down (for plugging into a breadboard).

    If you're using duPont hook-up wires, then of course you can use either male or female duPont connectors, to allow connecting to either female or male headers.

    I'd also be happy to solder the header on myself.

    Sorry if I'm rambling... just my 2c thoughts. :smile:
  • Bear in mind that the dev board will have pin headers so the P2D2 would need female headers to plug-in bottoms up! I will release some dev boards details shortly!

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  • Peter,

    I would prefer that headers in question remain unsoldered.

    Thanks
  • After a hiccup in the ordering process the pcbs finally arrived today. They had queried about how the v-groove would cut into copper on the edge of the pcb and this was lost in my emails and not showing on the job status page. Once I eventually found it 5 days later after wondering what was happening, they proceeded by increasing the edges of the pcb by 0.2mm, hence the delays. I will make up a panel tomorrow and test, and then if it is all good I can proceed with getting these assembled and shipped.

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  • Looking good Peter :smiley:
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  • roglohrogloh Posts: 1,695
    edited 2019-12-11 - 10:08:58
    Nice. I hope things all proceed well with your new boards Peter. Hopefully it might be a XMAS present for the locals?
  • I know, I'm a bit late. Is there still one board left for me? What would shipping to Germany cost? Or is there anybody from Europe here so we could bundle shipping?
  • Very nice! That component density on the right hand side of the board is truly a work of Art! (perhaps some magic art?). :smile:
  • GregC wrote: »
    Very nice! That component density on the right hand side of the board is truly a work of Art! (perhaps some magic art?). :smile:

    Thanks! Placement is everything when it comes to laying out a pcb. Having connectors in the right place and accessible, crystals close and tight to the chips, "broad ways" from regulator to chips, and effective direct decoupling as well as choice of component and package. Multi-layer boards make it easy to get some of this right without even trying but I try to make it work just as well with cost effective 2 layer boards and minimal vias. Then I get sneaky and use resistor networks since they are like much smaller resistors but in an easy to manually handle package. I used to use 0805 components but now they look like hippos next to 0603, which even seem too big sometimes :)

    If I was definitely going to large volume runs and the design is proven I might even go to 4 layer and 0402 components even, but in the case of the P2D2, the size is dictated to a large extent by the P2 and the large number of header pins.

    However I am doing up P2PAL, an extra thin "layer" for the P2D2 that surface mounts to the entire back of the pcb up to the 50mil "smd" headers which includes an ESP32 module, HyperRAM, a proper spring loaded microSD socket, LEDs, reset etc. This can even be soldered on after-market.

    Then there is my P2LAB, the dev board that the P2D2 plugs into to which includes IOMOD and mikroBUS headers, a JAMMA edge connector etc, and all the connectors that you would expect such as audio, HDMI, VGA, USB etc. But if you want, you can still place this P2LAB into a standard enclosure for commercial projects. I like to flip the box and use the lid as the base so that I only need to notch holes from the edge of the box for the connectors and then this also hides the lid screws if I cut keyhole mounts in the lid (as a base). Then I can make up a nice durable label by laser printing onto polyester laser label sheets using my HP laser because the genuine black toner is a strong even shiny black.


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  • @Peter Jakacki Does your P2 PAL board need the ESP32 and other parts, or can there still be a basic HyperRAM only version? i.e. Can these be optional?

    How did you plan to map the pins? Were the ESP serial pins also going to work with P62/P63?

    If it is still thin enough and can interoperate with the existing pin mapping I have I may like Wifi as well, as I have a Wifi part on my board that could be replaced by ESP32, but possibly not if it uses up a lot of other P2 pins. I had some muxing logic on my board that allowed USB if it was plugged in, and Wifi if USB was not plugged in. This was controlled by an AVR on board, which also contained the USB - serial interface like your EFM part.
  • Peter JakackiPeter Jakacki Posts: 8,799
    edited 2019-12-11 - 23:54:21
    rogloh wrote: »
    @Peter Jakacki Does your P2 PAL board need the ESP32 and other parts, or can there still be a basic HyperRAM only version? i.e. Can these be optional?

    How did you plan to map the pins? Were the ESP serial pins also going to work with P62/P63?

    If it is still thin enough and can interoperate with the existing pin mapping I have I may like Wifi as well, as I have a Wifi part on my board that could be replaced by ESP32, but possibly not if it uses up a lot of other P2 pins. I had some muxing logic on my board that allowed USB if it was plugged in, and Wifi if USB was not plugged in. This was controlled by an AVR on board, which also contained the USB - serial interface like your EFM part.

    I'm still thinking about how the ESP32 module will connect but certainly the serial port is a no-brainer. But the serial transmit from the ESP32 would be resistor coupled so that it can be overridden from the USB or from the direct Prop plug connection. In fact, I may get the UB3 chip to disconnect it's serial with a pullup still connected whenever it is not plugged into USB (attn: jmg!)

    Here is a basic plan of the P2PAL pcb as I am moving components around the board until I'm happy with it. I had swapped the microSD and ESP positions since HyperRAM also needed to be up closer to the P32 group but could connect to the P40 group if that works out as a better choice.

    Of course, you can have a P2PAL with just the HyperRAM if you want. It is also easy enough to hand solder the ESP32 module on afterwards too. I sourced some microSD sockets from LCSC at a very very good price, so that's why I allowed for it on the P2PAL just so I can easily get to the card and once it is inserted it is well protected.



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  • Here is how I did it on my board, but some of this design is untested as I was waiting for the P2D2.
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  • jmgjmg Posts: 14,152
    .. In fact, I may get the UB3 chip to disconnect it's serial with a pullup still connected whenever it is not plugged into USB (attn: jmg!)
    Good idea, I've added that. Light pullup until OPEN, then CMOS drive, and restores light pullup on CLOSE.

  • Peter JakackiPeter Jakacki Posts: 8,799
    edited 2019-12-12 - 00:44:38
    @rogloh - do you have a plain pdf of your schematic? I noticed that you use 22r series termination for USB. I know that the P2 has built-in 1.5k and 15k and it doesn't hurt to allow for termination, but do we still need them?

    Rather than a buffered and jumpered serial mux option I like the automatic override that comes from plugging in USB or a Prop Plug. It shouldn't matter if the WiFi receives data even when USB is plugged in either.

    Is there a preference for the HyperRAM on P32 etc or can they go elsewhere. I'm guessing that the 32-bit alignment helps though.

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  • P32..P39 data bus alignment really helps with this optimization ozpropdev found and uses in the HyperRAM code, allows writing data in a single instruction without the streamer. If you can put it there too, all the better.

    wfbyte inb (or ina)

  • @rogloh - do you have a plain pdf of your schematic? I noticed that you use 22r series termination for USB. I know that the P2 has built-in 1.5k and 15k and it doesn't hurt to allow for termination, but do we still need them?

    Rather than a buffered and jumpered serial mux option I like the automatic override that comes from plugging in USB or a Prop Plug. It shouldn't matter if the WiFi receives data even when USB is plugged in either.

    I do have a pdf schematic but (for now anyway) don't want to release the entire thing. Yeah the automatic override is nicer. I put in those jumpers that way really just for experimenting with. No need to require strapping options in the final thing. One thing that could be good though is to allow USB connection without always losing the wifi (for debug testing of wifi applications while you still download with USB etc), in that case having the ability to still be able to send wifi data to other P2 pins is handy, so perhaps some holes for optional jumpers to strap wifi to P2 pins would be good there.

    Those resistors are recommended for the ATMEL micro's USB IIRC, that was not a USB prop interface.
  • jmgjmg Posts: 14,152
    .. I noticed that you use 22r series termination for USB. I know that the P2 has built-in 1.5k and 15k and it doesn't hurt to allow for termination, but do we still need them?
    I think those 22R can also be used as jumpers, eg the Eval A IIRC had them, to allow USB-for-Power alone, so errant P2 pins do not fire some USB charger into a higher power mode....
    Looks like Eval B has removed those entirely, so it is safer, and purely USB 2A AUX only.
    Some vendors use 22R/27R to improve ESD and RFI.
    The EFM8UB3 has 8kV ESD spec, but I see SiLabs still suggest an ESD part, perhaps to get to 15kV ratings ?

  • jmg wrote: »
    .. I noticed that you use 22r series termination for USB. I know that the P2 has built-in 1.5k and 15k and it doesn't hurt to allow for termination, but do we still need them?
    I think those 22R can also be used as jumpers, eg the Eval A IIRC had them, to allow USB-for-Power alone, so errant P2 pins do not fire some USB charger into a higher power mode....
    Looks like Eval B has removed those entirely, so it is safer, and purely USB 2A AUX only.
    Some vendors use 22R/27R to improve ESD and RFI.
    The EFM8UB3 has 8kV ESD spec, but I see SiLabs still suggest an ESD part, perhaps to get to 15kV ratings ?

    I sourced some esd diodes from LCSC at a very good price. The part that is used on the EVAL USB is frightfully expensive for such a tiny component.

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  • While we wait with baited breath for Peter's new rev boards, is there going to be a Europe mass buying effort?
  • Peter mentioned a few post back that there would be an European distributor.

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  • Peter JakackiPeter Jakacki Posts: 8,799
    edited 2019-12-16 - 01:54:55
    After glitches and delays with getting the new pcbs and stencil back, I am about to start assembling the first panel for testing. I expect all to go well but I was just trying out a new stencil alignment checker using a mounted smartphone set up for super macro so that I can get precise alignment although next time I will have fiducials on a the edge strips of the paneled pcbs.


    BTW, even though this stencil looked like it was aligned, the camera revealed it was not so::
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