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2013-08-26 02:27 <DocScrutinizer05> lol!
2013-08-26 02:28 <DocScrutinizer05> >> [2013-08-25 19:56:06] <patchvonbraun1> bounce: But to be honest, these dongles are just fine for radio astronomy, provided you have adequate filtering in front of them, and some low-noise gain.  Which you always need anyway
2013-08-26 02:28 <DocScrutinizer05> >> [2013-08-25 19:56:33] <patchvonbraun1> bounce: I'm using a plethora of dongles on the SBRAC dish
2013-08-26 02:29 <whitequark> lol indeed
2013-08-26 02:30 <DocScrutinizer05> the dongle:  http://sdr.osmocom.org/trac/wiki/rtl-sdr   The dish: http://www.sbrac.org
2013-08-26 02:38 <wpwrak> and thus SETI (Summoning of ExtraTerrestrIals) enters an entirely new phase ...
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2013-08-26 07:27 <cde> DocScrutinizer05 :)
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2013-08-26 16:37 <paul_boddie> Hello! Does anyone have any opinions/experiences with the nanosleep system call on the NanoNote?
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2013-08-26 16:39 <paul_boddie> It doesn't seem very "nano", but I wonder if the NanoNote is fast enough to notice any intervals at that level.
2013-08-26 16:40 <larsc> nano is GHz
2013-08-26 16:41 <paul_boddie> Indeed.
2013-08-26 16:41 <paul_boddie> Even hundreds of nano - tenths of micro - are probably asking a bit much from the poor Ben.
2013-08-26 16:42 <paul_boddie> I think the call itself is probably expensive enough to burn up any delay of that order.
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2013-08-26 16:42 <larsc> yes
2013-08-26 16:43 <paul_boddie> So I guess I should ask what the best way is to put delays into NanoNote programs.
2013-08-26 16:43 <larsc> i = 100; while(--i);
2013-08-26 16:43 <larsc> ;)
2013-08-26 16:43 <paul_boddie> I've been doing I2C stuff, and without any delay I manage to race ahead of the slave unless I do an empty for loop. :-)
2013-08-26 16:44 <larsc> I'd let the kernel handle I2C stuff
2013-08-26 16:44 <paul_boddie> I haven't really had this problem with SPI stuff before now.
2013-08-26 16:44 <paul_boddie> Can the kernel coordinate I2C stuff over the 8:10/MMC port?
2013-08-26 16:45 <paul_boddie> I saw that wpwrak had done some SPI drivers which I should perhaps be looking at for my SPI experiments. (Or maybe I misremember.)
2013-08-26 16:45 <mth> if you configure the pins as plain GPIO pins, you should be able to use the i2c-gpio driver with them
2013-08-26 16:46 <mth> configure -> making sure no MMC driver claims them is probably enough
2013-08-26 16:46 <paul_boddie> Thanks, mth! I suppose the only disadvantage that I can think of is that I'm then forced into "driver space".
2013-08-26 16:46 <mth> you can send I2C messages from user space
2013-08-26 16:47 <mth> with only the bitbanging done in kernel
2013-08-26 16:47 <mth> see the i2c-tools package
2013-08-26 16:48 <paul_boddie> Useful to know, thanks! If I ever get to the point of wanting to migrate some of this into a driver, it'd be a nice first step.
2013-08-26 16:50 <paul_boddie> I guess it is this: http://www.lm-sensors.org/wiki/I2CTools
2013-08-26 16:50 <paul_boddie> And this: http://elinux.org/Interfacing_with_I2C_Devices
2013-08-26 16:51 <mth> yes
2013-08-26 16:54 <mth> here is an example of the configuration of the kernel side: http://projects.qi-hardware.com/index.php/p/qi-kernel/source/tree/jz-3.9/arch/mips/jz4740/board-a320.c
2013-08-26 16:54 <mth> search for "i2c"
2013-08-26 16:54 <mth> specifically, for CONFIG_I2C_GPIO
2013-08-26 16:55 <paul_boddie> Is this a recent kernel thing?
2013-08-26 16:57 <mth> no, it has been there a few years at least
2013-08-26 16:59 <paul_boddie> Maybe I have to dig a bit more in my kernel sources.
2013-08-26 16:59 <paul_boddie> Ah, I see it now!
2013-08-26 17:16 <paul_boddie> Thanks for the help once again! :-)
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