#qi-hardware on 2012-08-30 — irc logs at freenode.irclog.whitequark.org

2011-11-28 00:09 Topic for #qi-hardware is now Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben / atusb 802.15.4 wireless, and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs

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14:51 <kristianpaul> xiangfu: what happended with the other only tx hdl code?

14:51 <kristianpaul> I was wondering if the fpga4fun one was the only avaliable core...

14:52 <kristianpaul> Btw i dint knew it about this BSCAN_SPARTAN6

14:52 <xiangfu> (what happended with the other only tx hdl code?) what do you mean?

14:53 <kristianpaul> it dint work for you?

14:54 <kristianpaul> or you need rx as well as tx?

14:54 <kristianpaul> i mean the serial/uart core you was looking last time

14:54 <xiangfu> oh.

14:55 <xiangfu> I look at fpga4fun serial code.

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14:56 <xiangfu> I connect the Rx_data under the verlog code. : http://pastebin.com/JqHSYnhq

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14:57 <xiangfu> kristianpaul, there is a quiet good example on BSCAN_... : https://github.com/progranism/Open-Source-FPGA-Bitcoin-Miner/blob/master/projects/X6000_ztex_comm4/hdl/jtag_comm.v

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14:58 <xiangfu> I try to input data form serial core. and read the data out by using jtag.

14:59 <xiangfu> I can control LED by using BSCAN.. but i want more exactly data.

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14:59 <kristianpaul> Yeah i was about to ask you that (control by bscan)

15:00 <xiangfu> BTW: I wrote a mini-jtag for learning: https://github.com/xiangfu/mini-jtag

15:01 <xiangfu> that can re-configure/read idcode/load bistream to slx9.

15:01 <xiangfu> I have tested the code with m1. it works fine with m1(slx45) :)

15:01 <kristianpaul> Yeah i noticed it too :-)

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15:01 <xiangfu> kristianpaul, (control by bscan) then take a look at : https://github.com/progranism/Open-Source-FPGA-Bitcoin-Miner/blob/master/projects/X6000_ztex_comm4/hdl/jtag_comm.v

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15:02 <kristianpaul> yup, looking at it

15:07 <kristianpaul> had you asked to azonenberg? perhaps you can use his uart core, so it can distributed in your examples

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15:08 <kristianpaul> n8 :)

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15:29 <whitequark> this is a capture from an UART between an STM32 chip and a CP2102 USB-to-UART transceiver

15:29 <whitequark> http://plasmon.rghost.ru/40100131/image.png

15:29 <whitequark> why could it look like this?

15:30 <whitequark> i.e. very high ripple

15:30 <qi-bot> The build was successful: http://fidelio.qi-hardware.com/~xiangfu/build-nanonote/openwrt-xburst.minimal-20120829-1259

15:32 <whitequark> I guess it's due to parasitic capacitors and inductors somewhere in the circuit

15:35 <kristianpaul> perhaps you could do a loop in both devices send data and repeat the capture again to isolate a posible problem in one of then?..

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15:36 <whitequark> hm, how would that help?

15:36 <whitequark> I don't quite get the idea

15:37 <kristianpaul> well you just said have to separate boards?

15:37 <kristianpaul> or both ICs are in the same pcb?

15:37 <kristianpaul> perhaps i was confused

15:37 <kristianpaul> help to debug..

15:38 <whitequark> same pcb

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15:53 <rzk> whitequark: place 10ohm inline

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