#linuxcnc-devel | Logs for 2013-09-06

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[01:11:26] <andypugh> Baffled.
[01:11:31] <andypugh> (happens a lot)
[01:11:56] <andypugh> *enc->hal.pin.count = (enc->accum - enc->offset);
[01:11:57] <andypugh> *enc->hal.pin.position = ((float)(enc->accum - enc->offset)) / enc->hal.param.scale;
[01:12:13] <andypugh> the count pin says 2882.
[01:12:31] <andypugh> hal.param.scale is 1.0 (float param)
[01:13:05] <andypugh> "position" is 1.073742e+12
[01:13:25] <andypugh> I wonder what I am missing?
[01:16:00] <andypugh> accum and offset are s64. Is that the problem?
[01:18:51] <archivist> one line with a cast and the other not, is there a conversion available rather than a cast
[01:20:39] <andypugh> Maybe :-)
[01:21:12] <andypugh> I wouldn't actually expect to need a cast. int / float should just be float AFAIK.
[01:21:13] <micges> try casting each s64
[01:21:36] <archivist> cast to me says the take the content as float, it does not say convert it to a float
[01:22:15] <andypugh> True.
[01:22:40] <andypugh> But then this is what another guy did to make it work (I only got some SSI stuff yesterday)
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[01:27:40] <archivist> yet the C standard disagrees with me :)
[01:29:37] <andypugh> micges: You mean cast the scale to s64?
[01:30:32] <andypugh> halrun
[01:30:44] <micges> andypugh: *enc->hal.pin.position = ((float) enc->accum - (float) enc->offset) / enc->hal.param.scale;
[01:31:33] <andypugh> I don't like that
[01:32:31] <andypugh> both accum and offset might be very large, and then subtracting after a cast to float will be inexact
[01:33:33] <micges> hmm is it working wthout cast?
[01:33:56] <andypugh> No.
[01:34:09] <andypugh> Nor if multiplied by 1.0
[01:34:20] <andypugh> I suspect that the problem may not be arithmetic at all.
[01:36:21] <andypugh> Individually casting to float is no help.
[01:36:31] <archivist> there is an undefined where "if the value being converted is outside the range of values that can be represented the behavior is undefined"
[01:36:35] <andypugh> More cargo-cult programming to come.
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[01:47:05] <andypugh> Well, I remain baffled. Looks like a problem to sleep on.
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[02:20:49] <cradek> andypugh: hal pins are doubles, not floats. you should never have a cast to float.
[02:28:54] <cradek> but I have no idea whether that's the full answer to your problem...
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[04:44:10] <KGB-linuxcnc> 03chrisinnanaimo 05master 6f4b1df 06linuxcnc 10src/emc/usr_intf/gscreen/gscreen.py * gscreen -tell gscreen to look for skins in skin folder
[04:44:11] <KGB-linuxcnc> 03chrisinnanaimo 05master 7b327b9 06linuxcnc 10(94 files in 8 dirs) * gscreen config -add skin folder and files, remove skin files from sample configs
[04:44:14] <KGB-linuxcnc> 03chrisinnanaimo 05master be6380d 06linuxcnc 03configs/sim/gscreen_custom/9axis.ini * gscreen config -rename gscreen_custom to 9_axis
[04:44:21] <KGB-linuxcnc> 03chrisinnanaimo 05master d2a201a 06linuxcnc 10debian/linuxcnc.files.in * debian -add gscreen folders and files to be installed
[04:44:28] <KGB-linuxcnc> 03chrisinnanaimo 05master 0e42347 06linuxcnc 10lib/python/gladevcp/calculatorwidget.py * gladevcp -have the calculator show only integers when switch is on
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[12:23:05] <KGB-linuxcnc> 03jepler 05master 77c8fc2 06linuxcnc 10src/hal/classicladder/drawing.c * classicladder: cast to double to do FP arithmetic on integers
[12:23:06] <KGB-linuxcnc> 03jepler 05master 071f36c 06linuxcnc 10src/hal/user_comps/mb2hal/mb2hal.c * mb2hal: compute timeouts with integer math
[12:23:09] <KGB-linuxcnc> 03jepler 05master 602204c 06linuxcnc 10src/hal/user_comps/vfs11_vfd/vfs11_vfd.c * vfs11_vfd: don't needlessly cast
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[18:40:05] <andypugh> does rtapi_print understand the %llx format from printk?
[18:42:54] <andypugh> I am a bit puzzled by the result of printing the initial value of an s64 variable with %llx then setting it to 0, then printing it again giving the exact same non-zero (and only 26 bits long) number both before and after setting the value.
[18:47:44] <awallin> andypugh: here's some code for printing 64bit numbers http://www.ohwr.org/projects/wrpc-sw/repository/revisions/master/entry/monitor/monitor.c#L29
[18:47:58] <awallin> (from a completely unrelated project, but anyway)
[18:48:36] <andypugh> I guess that is one way :-)
[18:48:55] <andypugh> I thought that 64-bit printing was included in printk though
[18:49:19] <andypugh> http://www.mjmwired.net/kernel/Documentation/printk-formats.txt
[18:49:57] <awallin> elsewhere I've used also: printf( "WR-time : %" PRId64 ".%09d \n", utc_seconds, nsecs);
[18:50:12] <awallin> which requires #include <inttypes.h>
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[19:00:09] <andypugh> As far as I know rtapi_print uses a subset of printk, which rather limits what I can do.
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[19:02:24] <jepler> andypugh: yeah I don't think you can use ll or L specifiers in rtapi_print_msg et al
[19:02:57] <andypugh> This gets stranger by the moment...
[19:03:04] <jepler> that's why my mail recommended getting the low and high halves for separate inspection
[19:03:27] <andypugh> That is what I am doing. I am seeing high-order bits.
[19:03:58] <andypugh> I was seeing non-zero values at init time, but that stopped, and the run-time values made sense for a while.
[19:04:27] <andypugh> Then the init-time values continued to make sense, but the run-time ones went crazy again.
[19:06:18] <andypugh> The problem actually seems to be the old_pos. (which is in code you haven't seen).
[19:07:56] <andypugh> I had that as a u32, but things work better with s32. But I think that the data in the Mesa registers is always raw-bits, so technically u32. But to complicate matters the underlying data is arbitrary bit-length and gray-coded.
[19:11:18] <jepler> when using shift operators there are differences in how signed and unsigned types work
[19:13:01] <jepler> for instance, for(int i=1; i; i<<=1) is undefined behavior and gives an infinite loop in some incarnations of gcc
[19:13:22] <jepler> I have no reason to believe that specific example is related to what you're seeing
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[19:33:13] <jepler> heck, even just wrapping around from negative to positive again is undefined on signed integers
[19:33:40] <jepler> maybe we should turn on -fno-strict-overflow where applicable (probably everywhere) because it returns some of these things to the state we expect
[19:34:41] <andypugh> Hmm, I wish I fully understood the complexities.
[19:35:33] <andypugh> I am trying to decide how to handle the fact that there may be multiple fields in the bit stream.
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[20:37:42] <jepler> andypugh: I don't have any specific advice though a blog I follow has recently been discussing dealing with foreign bitfields in C .. first of 2+ parts: http://jeelabs.org/2013/09/05/decoding-bit-fields/
[20:38:34] <andypugh> jepler: Are you on the other channel too? I am discssing a format specifier there with PCW
[20:38:45] <jepler> I never pay attention over there..
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[20:44:50] <andypugh> jepler: As a point of style. The code to extract the bits is likely to be extemely simiar to the code that handles the smart-serial 96-bit bitfields. Does it make more sense to copy the smart-serial code, or to use the same code?
[20:45:25] <jepler> if you can arrange to use the same code twice (not copy & paste) that's a win
[20:47:57] <andypugh> OK. I guess that re-using the same catch-all data type is going to be handy too.
[20:49:28] <andypugh> I have a feeling that sserial_pin_t (in sserial.h) should really have been a Union, though I can't imagine that there is much overhead in a struct of pointers only one of which ever gets initialised.
[20:50:47] <andypugh> Why do I end up writing so many polymorphic components?
[20:51:07] <jepler> because it's less time consuming than writing a million components that don't adapt?
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[20:51:42] <andypugh> Well, yes, but nobody else really seems to try.
[20:52:02] <jepler> seb certainly did when he made the hm2 drivers...
[20:52:12] <jepler> but I certainly haven't done it to anything like the extent you have
[20:53:39] <andypugh> I certainly seem to be exploring the boundaries of "comp" that's for sure. (Which is a marvellous tool)
[20:54:05] <jepler> at some point I assume you'll have had enough and fix it to do what you need
[20:54:21] <jepler> <1/2 wink>
[20:54:29] <andypugh> I would need to learn Python first :-)
[20:55:12] <jepler> you've had years!
[20:55:40] <andypugh> One handy option, though, would be to be able to alias "Personality". I think it would still be called "Personality" in the code, but would be a different name as a modparam an in the docs.
[20:56:01] <andypugh> Yeah, but I am only about 42% of the way through learning C!
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[20:59:19] <andypugh> This SSI encoder stuff was intended to be a quick and easy thing to get me back into the swing of coding after a hiatus (of actually working with hardware) to then move back on to Tool Table stuff (in Python, mainly) But is has proven to be rather complex.
[21:00:49] <jepler> :-/
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[21:04:22] <andypugh> Hmm, and now I am wondering if I need to re-structure sserial so that I can re0use the code....
[21:05:11] <andypugh> First I reckon I will see how I get on with making an SSI device look _exactly_ like a smart-serial.
[21:06:34] <andypugh> There is a precendent for this, if you look in sserial.h you will find two dummy config roms for devices that pre-dated the config rom.
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[21:08:35] <jepler> I'm not going to second-guess you about that
[21:10:03] <andypugh> Well, _first_ I need to make a patch for the people who want SSI _now_
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