| 23:00 | Bertl | check out the C tools which access registers
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| 23:00 | BAndiT1983 | also it's called everytime and maps over and over, which is a little disturbing
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| 23:00 | BAndiT1983 | which tools do you mean?
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| 23:01 | Bertl | like the cmv_snap3
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| 23:01 | BAndiT1983 | se6astian showed me also the code where registers are read for DNG export
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| 23:01 | Bertl | wb Alvis!
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| 23:05 | BAndiT1983 | this methods should be centralized i think, as there are many helpers in there
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| 23:07 | BAndiT1983 | it would reduce the code and would simplify maintenance in the future, but there are many more things which can be straighten
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| 23:08 | BAndiT1983 | would it be sufficient to do memory mapping at dameon start?
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| 23:09 | Bertl | probably, but note that you might want to limit the mappings to ranges which are actually used
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| 23:10 | BAndiT1983 | how does the repeating call of mmap affects performance?
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| 23:10 | Bertl | I don't think it has any effect on performance at all
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| 23:10 | Bertl | it will create more TLB entries though
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| 23:11 | BAndiT1983 | according to the cmv script there are 4 ranges which are used for spi registers
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| 23:12 | Bertl | really?
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| 23:12 | BAndiT1983 | i would like to reduce calls as far as possible, so the things are managed in a central place, so lower overhead and higher performance
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| 23:12 | BAndiT1983 | https://github.com/apertus-open-source-cinema/beta-software/blob/master/beta-scripts/cmv.func
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| 23:13 | Bertl | only the cmv_reg is actually SPI mapped to registers
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| 23:14 | BAndiT1983 | are others not used at the moment?
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| 23:14 | Bertl | they are used, but there is no SPI involved
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| 23:15 | BAndiT1983 | alright, but as they are mapped it doesn't matter on the linux end
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| 23:15 | Bertl | correct, check out ug585 for a zynq memory map
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| 23:18 | Bertl | (page 112)
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| 23:19 | BAndiT1983 | already there ;) , got there and in the next second you message appeared
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| 23:19 | BAndiT1983 | *your
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| 23:19 | Bertl | the two PL ranges are where we can put registers
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| 23:20 | Bertl | (i.e. virtual registers inside the FPGA)
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| 23:20 | BAndiT1983 | what is mapped besides CMV registers?
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| 23:21 | Bertl | https://wiki.apertus.org/index.php/CMV12000_Register_Blocks
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| 23:22 | BAndiT1983 | you've shown me that already ;) but i was wondering if there are also other things mapped besides the sensor
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| 23:22 | Bertl | in the first two tables, the sensor is only one line :)
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| 23:23 | BAndiT1983 | ah, so the caption of the page is misleading a bit
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| 23:23 | Bertl | yes, very much
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| 23:24 | Bertl | https://wiki.apertus.org/index.php/CMV12000_to_HDMI_registers
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| 23:24 | Bertl | this one too, no idea why folks keep calling it CMV12k
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| 23:24 | BAndiT1983 | hm, i think i can really encapsulate some things and there would be some kind of API
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| 23:24 | BAndiT1983 | wiki has to be reviewed again, but now against technical specs
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| 23:25 | Bertl | also note that this map is from the AXIOM Alpha and has certainly changed in the Beta
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| 23:25 | Bertl | some blocks were added, like for the pong stuff
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| 23:26 | Bertl | others were slightly rearranged (bits and their meaning changed)
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| 23:26 | BAndiT1983 | as i don't have the hardware it doesn't really matter, but it's a good material for my reflection on how to proceed
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| 23:30 | RexO | Definitely keep on top of Wiki entries as and when.
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| 23:33 | BAndiT1983 | i'm missing a little bit breadcrumbs in apertus wiki
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| 23:33 | BAndiT1983 | or to be precise, categories
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| 23:34 | BAndiT1983 | like in normal wiki at the bottom, so one can look up all the things in the category in one go
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| 23:34 | BAndiT1983 | https://en.wikipedia.org/wiki/Bayer_filter
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| 23:34 | BAndiT1983 | https://en.wikipedia.org/wiki/Category:Color_filter_array
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| 23:35 | Bertl | did you try adding a [[Category:xxxx]] link?
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| 23:35 | BAndiT1983 | i would never find registers without the link from Bertl
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| 23:35 | Bertl | that's how wikipedia does it IIRC
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| 23:36 | BAndiT1983 | apertus wiki doesn't seem to be categorized
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| 23:37 | RexOrCine | There was a version two main page list that came up at one point, but it never got implemented.
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| 23:37 | BAndiT1983 | this is appended in the normal one -> [[Category:Digital photography]]
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| 23:37 | BAndiT1983 | [[Category:Image sensors]]
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| 23:37 | BAndiT1983 | [[Category:Color filter array]]
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| 23:38 | RexOrCine | https://wiki.apertus.org/index.php?title=NewMain_Page
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| 23:38 | RexOrCine | Came up here - https://lab.apertus.org/T122
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| 23:38 | BAndiT1983 | oha, much better
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| 23:39 | Bertl | so you don't like the colorful blocks on the current main page?
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| 23:39 | RexOrCine | That would mean abandoning the images on the main page, which I'd probably disapprove of, but it would be good to have an option available for people to reconfigure things
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| 23:40 | BAndiT1983 | you don't have to abandon images, but we should consider to add categories
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| 23:41 | RexOrCine | I agree.... I even thought that new main page might be good at the bottom of the main page, but there were warning signs attached, and I didn't know what to make of that ie. "Don't edit this or it'll break"
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| 23:41 | BAndiT1983 | seems to work, i get Categories: Beta Hardware | Registers at the bottom
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| 23:42 | BAndiT1983 | we need just meaningful names for that stuff, then it's much easier to move in the same area to get more info
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| 23:42 | Bertl | so what's the problem then? :)
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| 23:43 | BAndiT1983 | i don't know where the parts belong to, you said it's partially from alpha
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| 23:44 | Bertl | in general, you can assume that everything which doesn't explicitely say 'Beta' somewhere is ffrom the Alpha
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| 23:44 | Bertl | *from*
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| 23:44 | BAndiT1983 | https://wiki.apertus.org/index.php/CMV12000_Register_Blocks
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| 23:44 | BAndiT1983 | there should be 2 categories at the bottom as test
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| 23:44 | BAndiT1983 | don't know why the category pages are editable, they usually shoudn't be
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| 23:45 | Bertl | you can lock pages down, probably that's what wikipedia does
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| 23:48 | BAndiT1983 | the page has to be created once, just entered summary and and content as "Registers"
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| 23:48 | BAndiT1983 | now they should stay blue
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| 23:51 | BAndiT1983 | so, bed time for me, see you later
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| 23:52 | Bertl | nn
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| 03:05 | Bertl | off to bed now ... have a good one everyone!
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| 04:31 | usmankhan | Hello, Bertl, I am not sure how we can use a single comparator to build ADC. Maybe, we can use a successive approximation ADC which uses a comparator but in that case the control logic will be provided by the FPGA
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| 04:34 | usmankhan | The disadvantage, however, (compared to a traditional flash ADC) is that it can handle a typically maximum frequency of 100kHz
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| 04:36 | usmankhan | http://www.electronics.dit.ie/staff/tscarff/dac_adc/adc_da2.gif
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| 08:47 | Bertl | morning folks!
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| 08:48 | Bertl | Hey IldarValiev!
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| 08:49 | Bertl | usmankhan: the idea is to drop the ADC and have one or two comparators which compare the output voltage to the reference voltage generated by the DAC
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| 14:14 | usmankhan | Ok, I get the idea. However, we won't be able to implement the modified adaptive PID algorithm since we don't know the precise error values.
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| 14:15 | usmankhan | Also, I remember from one of the earlier chats where you said that we should be able to check if the error exceeds a certain threshold and we should be able to log/report that. That won't be possible with this approach too
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| 14:16 | usmankhan | Anyway, I will modify the proposal as per your comments and then discuss further
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| 14:17 | usmankhan | In the meanwhile, please let me know if you have any other comments
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| 14:27 | Bertl_oO | usmankhan: as I said, maybe investigate both options and evaluate the pros and cons ... note that we need to connect the ADC somehow and also note that we need at least 8 ADCs for the planned power board
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| 14:37 | usmankhan | Alright, makes sense. I will do that and get back to you
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| 19:05 | Bertl | back now ...
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