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2012-08-12 13:37 <valhalla> I've flashed the latest uboot (2012-07-11) on the nanonote and now it isn't booting from SD anymore (I press M+power it cycles inside uboot until I release M, and then starts from the nand)
2012-08-12 13:42 <xiangfu> valhalla, sorry about the bug, the code is same, after we update the gcc/uclibc, it woldn't  boot from sd anymore
2012-08-12 13:43 <kristianpaul> :o
2012-08-12 13:43 <xiangfu> valhalla, please revert back to : http://downloads.qi-hardware.com/software/images/NanoNote/Ben/2011-11-13/openwrt-xburst-qi_lb60-u-boot.bin
2012-08-12 13:43 <xiangfu> valhalla, I will try to fix that bug next few days. (I am slow)
2012-08-12 13:46 <xiangfu> kristianpaul, Hi
2012-08-12 13:46 <xiangfu> kristianpaul, I have one fpga question.
2012-08-12 13:47 <kristianpaul> oh sure
2012-08-12 13:47 <kristianpaul> Hi !
2012-08-12 13:48 <valhalla> xiangfu: ok, so it is a known problem, thanks
2012-08-12 13:48 <xiangfu> kristianpaul, here is a simple verlog code.
2012-08-12 13:50 <xiangfu> kristianpaul, if I don't connect any oscillator, the 'y'(which I connect a led) will flash. where is the clock from?
2012-08-12 13:50 <kristianpaul> i think i missed your pastebin..
2012-08-12 13:51 <kristianpaul> you dont need an oscillator all times, it varies from what you want to synthesize
2012-08-12 13:52 <xiangfu> kristianpaul, here: http://pastebin.com/kLTn9JS2
2012-08-12 13:54 <kristianpaul> and the .ucf?
2012-08-12 13:54 <xiangfu> kristianpaul, http://pastebin.com/bA6sxiKj
2012-08-12 13:55 <xiangfu> kristianpaul, there is nothing connect to P55.
2012-08-12 13:56 <kristianpaul> okay but is unconeected?
2012-08-12 13:56 <kristianpaul> not even grounded?
2012-08-12 13:56 <xiangfu> no ground. nothing.
2012-08-12 13:56 <kristianpaul> wich would made me think thats where you clock came from :)
2012-08-12 13:56 <kristianpaul> ah
2012-08-12 13:57 <xiangfu> that is my question. I use jtag load the bitstream to chip.
2012-08-12 13:58 <kristianpaul> i *think* your "clock" just came from the static,
2012-08-12 13:59 <kristianpaul> if you have a scope around you could try to see the LED input from fpga
2012-08-12 13:59 <kristianpaul> i bet is not that stable clock at all
2012-08-12 14:00 <kristianpaul> jtag have its own clock, not to be related with any other clock source used on your verilog project
2012-08-12 14:00 <kristianpaul> xiangfu: u there?
2012-08-12 14:00 <xiangfu> yes
2012-08-12 14:01 <kristianpaul> why you not try to ground that P50
2012-08-12 14:01 <xiangfu> you mean P55?
2012-08-12 14:01 <kristianpaul> ah yes sorry
2012-08-12 14:01 <xiangfu> kristianpaul, here is my board: http://en.qi-hardware.com/wiki/Mini-slx9
2012-08-12 14:02 <kristianpaul> from the verilog it self or externally
2012-08-12 14:02 <xiangfu> kristianpaul, all pins are not ground . I only connect the pins I am using.
2012-08-12 14:02 <kristianpaul> well, in your UCF file you claim that will use that P55
2012-08-12 14:02 <kristianpaul> you dint.. but you either ground it..
2012-08-12 14:03 <kristianpaul> so this could lead to unknow behavior i think
2012-08-12 14:03 <kristianpaul> ah nice board !
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2012-08-12 14:04 <kristianpaul> xiangfu: what i said answer your question?
2012-08-12 14:05 <xiangfu> (lead to unknow behavior i think). ok.
2012-08-12 14:05 <kristianpaul> i'm not 100% certain
2012-08-12 14:05 <kristianpaul> but just what i learn from milkymist, ie this https://github.com/milkymist/milkymist/blob/master/boards/milkymist-one/rtl/system.v#L1103
2012-08-12 14:06 <xiangfu> ok. I have 40M,20M,8M,6M,2M  oscillator
2012-08-12 14:06 <kristianpaul> made me think if not using it you should ground it "assign mc_clk = 1'b0;"
2012-08-12 14:06 <xiangfu> I try to connect 40M/20M to P55.
2012-08-12 14:06 <kristianpaul> in your case externally
2012-08-12 14:07 <kristianpaul> what happen when you connect it?
2012-08-12 14:08 <xiangfu> but the mc_clk is output. not like my P55(input)
2012-08-12 14:08 <kristianpaul> ahh true
2012-08-12 14:08 <xiangfu> kristianpaul, nothing happen. I keep get 0 from 'x'
2012-08-12 14:08 <xiangfu> I also not sure if my little  oscillator board is working.
2012-08-12 14:09 <xiangfu> I just connect 3.3v and GND to the osc. and connect one wire to P55.
2012-08-12 14:09 <kristianpaul> you have scope?
2012-08-12 14:10 <xiangfu> from the datasheet. it says the userclk must be short then 0.8cm (Stubs, if necessary, must be shorter than 8 mm (0.3 inches).)
2012-08-12 14:10 <kristianpaul> hmm
2012-08-12 14:10 <xiangfu> kristianpaul, I have a usb scope. dso2090. but after update my system the 'openhantek' command not working any more.
2012-08-12 14:11 <wpwrak> your little board probably violates a 1000 design recommendations already. what's one more ? ;-))
2012-08-12 14:11 <xiangfu> wpwrak, :-)
2012-08-12 14:11 <kristianpaul> xD
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2012-08-12 14:11 <wpwrak> just try to run things at slow clocks and slow I/O (QUIETIO sounds good), then you should be able to get away with most things.
2012-08-12 14:14 <xiangfu> wpwrak, yes. I have 40M/20M osc on my desk. the 8M/6M/2M osc is one the way to my desk. :)
2012-08-12 14:15 <xiangfu> hope the 2M is slow enough.
2012-08-12 14:16 <xiangfu> the hdl code is interesting. is not running line by line. once power on. all lines code are running. :)
2012-08-12 14:16 <kristianpaul> yup
2012-08-12 14:17 <kristianpaul> as it is sinthesized
2012-08-12 14:17 <xiangfu> wpwrak, I read the QUIETIO is better for LED.
2012-08-12 14:17 <xiangfu> in fact I am not question understand. when should i use QUIETIO/SLOW/FAST
2012-08-12 14:18 <xiangfu> kristianpaul, wpwrak : after I remove 'clk/P55' the led still flashing.  the code is like: http://pastebin.com/rYb33fVS
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2012-08-12 14:19 <kristianpaul> how you connected a and b?
2012-08-12 14:20 <xiangfu> to 3.3v
2012-08-12 14:21 <kristianpaul> btw your counter missed a reset.. guess not matter much here but just to get used to use it :)
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2012-08-12 14:23 <kristianpaul> but is flashing under the espected freq?
2012-08-12 14:24 <kristianpaul> if you ground 1 or b, it should stop
2012-08-12 14:24 <kristianpaul> s/1/a
2012-08-12 14:24 <qi-bot> kristianpaul meant: "if you ground a or b, it should stop"
2012-08-12 14:25 <xiangfu> it's flashing at expected freq.
2012-08-12 14:25 <xiangfu> if I ground b or a to GND, it will stop.
2012-08-12 14:26 <xiangfu> all works like there is a clock somewhere.
2012-08-12 14:28 <kristianpaul> the counter :-)
2012-08-12 14:32 <kristianpaul> thats your clock source
2012-08-12 14:34 <xiangfu> what you mean?
2012-08-12 14:34 <kristianpaul> your hdl code describe something that looks like a counter
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2012-08-12 14:37 <kristianpaul> you have the build log at hand?
2012-08-12 14:38 <xiangfu> kristianpaul, I can rebuild it now. wait
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2012-08-12 14:42 <xiangfu> kristianpaul, here is the full log: http://pastebin.com/6aGMku8k
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2012-08-12 14:45 <kristianpaul> ah look line 111
2012-08-12 14:45 <kristianpaul> that is a loop aka your clock source :-)
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2012-08-12 14:52 <xiangfu> still don't understand :(
2012-08-12 14:53 <kristianpaul> you could make a clock using combinational logic
2012-08-12 14:53 <kristianpaul> thats a circuit input is fed by it own output
2012-08-12 14:54 <kristianpaul> so is a loop
2012-08-12 14:54 <xiangfu> ok
2012-08-12 14:54 <xiangfu> kristianpaul, thanks. I got it.
2012-08-12 14:54 <kristianpaul> sure? ..
2012-08-12 14:55 <kristianpaul> i still thinkking.. well i dont know how xst sinthesized it..
2012-08-12 14:55 <xiangfu> I got some idea. not very clear. my goal is connect the external osc. this is not very important for now. :)
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2012-08-12 14:55 <kristianpaul> ah ok
2012-08-12 14:55 <kristianpaul> you could even made an osc of the fpga, using a couple not gates in a loop :)
2012-08-12 14:56 <xiangfu> kristianpaul, is there some code? :)
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2012-08-12 14:57 <kristianpaul> second
2012-08-12 14:57 <kristianpaul> oops, better minute i'm looking
2012-08-12 15:13 <kristianpaul> damn, so far i just found this ilustration http://goo.gl/oibwQ
2012-08-12 15:15 <xiangfu> sure I just take a look. and learn
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2012-08-12 15:28 <Fallenou> xiangfu: hey :) experimenting some fpga design ? :)
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2012-08-12 15:46 <LunaVorax> hi
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2012-08-12 20:14 <Jay7> http://youtu.be/ikD_3Vemkf0
2012-08-12 20:14 <Jay7> 3d tracking interface
2012-08-12 20:14 <Jay7> even so: http://makeprojects.com/Project/A-Touchless-3D-Tracking-Interface/2233/1#.UCgOnztlyXI
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