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<
DocScrutinizer05 >
lol!
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
02:28
<
DocScrutinizer05 >
>> [2013-08-25 19:56:33] <patchvonbraun1> bounce: I'm using a plethora of dongles on the SBRAC dish
02:29
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whitequark >
lol indeed
02:38
<
wpwrak >
and thus SETI (Summoning of ExtraTerrestrIals) enters an entirely new phase ...
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cde >
DocScrutinizer05 :)
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paul_boddie >
Hello! Does anyone have any opinions/experiences with the nanosleep system call on the NanoNote?
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16:39
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paul_boddie >
It doesn't seem very "nano", but I wonder if the NanoNote is fast enough to notice any intervals at that level.
16:40
<
larsc >
nano is GHz
16:41
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paul_boddie >
Indeed.
16:41
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paul_boddie >
Even hundreds of nano - tenths of micro - are probably asking a bit much from the poor Ben.
16:42
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paul_boddie >
I think the call itself is probably expensive enough to burn up any delay of that order.
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paul_boddie >
So I guess I should ask what the best way is to put delays into NanoNote programs.
16:43
<
larsc >
i = 100; while(--i);
16:43
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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. :-)
16:44
<
larsc >
I'd let the kernel handle I2C stuff
16:44
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paul_boddie >
I haven't really had this problem with SPI stuff before now.
16:44
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paul_boddie >
Can the kernel coordinate I2C stuff over the 8:10/MMC port?
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.)
16:45
<
mth >
if you configure the pins as plain GPIO pins, you should be able to use the i2c-gpio driver with them
16:46
<
mth >
configure -> making sure no MMC driver claims them is probably enough
16:46
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paul_boddie >
Thanks, mth! I suppose the only disadvantage that I can think of is that I'm then forced into "driver space".
16:46
<
mth >
you can send I2C messages from user space
16:47
<
mth >
with only the bitbanging done in kernel
16:47
<
mth >
see the i2c-tools package
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.
16:54
<
mth >
search for "i2c"
16:54
<
mth >
specifically, for CONFIG_I2C_GPIO
16:55
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paul_boddie >
Is this a recent kernel thing?
16:57
<
mth >
no, it has been there a few years at least
16:59
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paul_boddie >
Maybe I have to dig a bit more in my kernel sources.
16:59
<
paul_boddie >
Ah, I see it now!
17:16
<
paul_boddie >
Thanks for the help once again! :-)
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