11:31 <whitequark> electronic_eel: https://www.nxp.com/products/interfaces/ic-spi-serial-interface-devices/ic-general-purpose-i-o/pcal6534-ultra-low-voltage-level-translating-34-bit-ic-bus-smbus-i-o-expander:PCAL6534

11:31 <whitequark> 34 bit pca expander

11:56 <_whitenotifier> [glasgow] whitequark commented on issue #169: revD minispec - https://git.io/JeCHn

12:23 <_whitenotifier> [glasgow] whitequark commented on issue #169: revD minispec - https://git.io/JeCHA

12:36 <_whitenotifier> [glasgow] whitequark commented on issue #169: revD minispec - https://git.io/JeCQt

13:06 <whitequark> electronic_eel: thinking about it again, i am strongly in favor of using INA233 and connecting its ALERT pin directly to the LDO. this goes well in line with other safety features of Glasgow.

13:07 <whitequark> in fact i now think this design should definitely be used for revD.

13:07 <whitequark> (and revC2 in the future)

13:25 <whitequark> electronic_eel: re INA233, did you mean we should reuse eg. R48 as existing high side shunt, or reuse the value of R48 to add an additional low side shunt?

13:46 <_whitenotifier> [GlasgowEmbedded/glasgow] whitequark pushed 1 commit to master [+0/-0/±1] https://git.io/JeC7E

13:46 <_whitenotifier> [GlasgowEmbedded/glasgow] whitequark bfe49be - applet.sensor.ina260: style/wording. NFC.

13:56 <gruetzkopf> organised as 5x8bit

14:03 <whitequark> yes but we expose the logical view, not the physical

14:03 <_whitenotifier> [glasgow] Success. The Travis CI build passed - https://travis-ci.org/GlasgowEmbedded/glasgow/builds/594604499?utm_source=github_status&utm_medium=notification

16:29 <mwk> so uh, I have an FPGA board with shit I/O capabilities and I want to transfer a lot of data to/from a host machine

16:30 <mwk> I'm thinking of using its GPIO pins to connect to glasgow and use it as a host interface

16:30 <mwk> is there some ready-made applet for such use-case or do I get to write my own?

16:31 <mwk> my requirements are: lotsa bandwith (as much as can be spared), but no realtime constraints (it's... let's call it a "compute" job); I want to transfer small request-reply packets (max 64 bytes I think) in both directions (with pipelining), roughly symmetric bandwidth requirements both ways

16:33 <emily> aww ye hyperspeed UART time

16:34 <mwk> sort of, yes

16:37 <mwk> oh, and: the target board cannot do LVDS, I just have 16 single-ended 3.3V I/Os

16:39 <mwk> correction, 32 single-ended I/Os

16:39 <mwk> and the FPGA can do LVDS, it's just that the board manufacturer didn't care about pairing anything

16:41 <mwk> this is the PoS: https://numato.com/product/mimas-v2-spartan-6-fpga-development-board-with-ddr-sdram

16:41 <mwk> it's a board so well-designed, they figured that including a 19200baud-only USB-to-UART is a good idea

17:46 <electronic_eel> whitequark: do you want to use the PCAL6534 on revD? If you let me, I'll certainly get some new circuit ideas to put all those 34 bits to use :)

17:49 <electronic_eel> whitequark: I thought of using R48 as high side shunt. Low side is calling for lots of trouble because you'd need to have per-port-GNDs and can't connect a DUT with one common GND to more than one port

17:54 <electronic_eel> now we wouldn't really need 34 extra GPIOs on revD, but a more reasonably sized io expander would still make sense: we could move all the leds onto it and free up some proper GPIO pins

18:08 <electronic_eel> on of these GPIOs could be used for a analog mux that connects all the ALERT pins of the INA233s together. That would allow the user to select between per-port shutoff and full hardware shutoff for all ports together

18:38 <electronic_eel> we could also consider using two of the now freed fx2 pins to create a second, low speed, bit banged i2c bus

18:39 <electronic_eel> that can then be used through the PCA9545 i2c switch to talk to the addon boards

18:40 <electronic_eel> as it is separate and software-only, it would have no chance to somehow interfere with the internal i2c of glasgow, which wouldn't be exposed at all

23:06 <esden> Ok, Glasgow CrowdSupply pre-launch page is now updated! Thank you all for all the corrections and improvements. :D (especially electronic_eel ;) ) https://www.crowdsupply.com/1bitsquared/glasgow