Seeing as I am either using wifi modem emulators based on ESP8266, or ethernet cartridges running under IP65, what do I do? -Thom On Sun, Jul 1, 2018 at 2:47 PM Mike Stein <mhs.stein@gmail.com> wrote: > Keep in mind that XON/XOFF expects a fairly immediate response; a common > issue using it these days is that you're not necessarily receiving single > characters but packets and you could receive quite a few characters before > XOFF has any effect. > > m > > ----- Original Message ----- > From: <groepaz@gmx.net> > To: <cbm-hackers@musoftware.de> > Cc: "Thom Cherryhomes" <thom.cherryhomes@gmail.com> > Sent: Sunday, July 01, 2018 1:55 PM > Subject: Re: Developing PLATOTerm64, Flow Control woes. > > > uh, its like 5 lines of code. thats kinda the point - take your plato > stuff > out of the equation and test *only* the rs232 driver. when this works, > then > the problem is in your code, not the driver. (i'd even test against some > terminal program on the other end, not the plato server - because who > knows) > > > Am Sonntag, 1. Juli 2018, 19:46:17 CEST schrieb Thom Cherryhomes: > > there is no simple text mode in PLATO. can't do that. > > > > -Thom > > > > On Sun, Jul 1, 2018 at 12:43 PM <groepaz@gmx.net> wrote: > > > i'd try those routines with a very simple text terminal implementation > > > first, > > > and see if the flow control works right. XON/OFF is always a bit > tricky, > > > so it > > > might just be the thresholds that need tweaking. > > > > > > Am Sonntag, 1. Juli 2018, 19:32:04 CEST schrieb Thom Cherryhomes: > > > > great, now if only I can figure out wtf to do... I'm not a skilled > C64 > > > > programmer, am only passing through to write this terminal. > > > > > > > > -Thom > > > > > > > > On Sun, Jul 1, 2018 at 12:30 PM David Roberts <daver21145@gmail.com> > > > > > > wrote: > > > > > I have never used cc65 - but I know programmers who have been > caught > > > > > > out > > > > > > > > on other platforms. > > > > > > > > > > NMI routines need to make sure that all CPU registers are > > > > > > saved/restored > > > > > > > > and that data structures remain intact. If the NMI routine changes > > > > > anything > > > > > that is relied on outside of it (without the appropriate > protection) > > > > > > you > > > > > > > > are in trouble... > > > > > > > > > > Interrupts can be inhibited during critical processing outside of > the > > > > > interrupt service routine. An NMI requires special treatment. We > use > > > > > > NMI > > > > > > > > as > > > > > a critical error and real-time clock handler (in preference to an > > > > > interrupt) in a piece of communications hardware we use; but the > > > > > > hardware > > > > > > > > contains a mechanism for (very briefly) disabling the NMI around > very > > > > > critical data structures that absolutely must not be modified > should a > > > > > critical error (such as a bus timeout on the MULTIBUS) occur. > > > > > > > > > > Not sure how much of this is relevant to your problem, but it fits > the > > > > > symptoms you have... > > > > > > > > > > Dave > > > > > > > > > > On Sunday, 1 July 2018, Thom Cherryhomes < > thom.cherryhomes@gmail.com> > > > > > > > > > > wrote: > > > > >> The up2400 routines use the NMI to do all the shifting and > filling of > > > > > > the > > > > > > > >> buffers. > > > > >> > > > > >> I'm not entirely sure volatile has any meaningful consequence in > > > > >> cc65. > > > > >> > > > > >> -Thom > > > > >> > > > > >> On Sun, Jul 1, 2018 at 11:54 AM David Roberts < > daver21145@gmail.com> > > > > >> > > > > >> wrote: > > > > >>> I have only just had a cursory look at the sources, but does > > > > >>> anything > > > > >>> use interrupts? Usually interrupts cause unexpected results. > > > > >>> > > > > >>> The other thing to be wary of (with C code) is the ability of the > > > > >>> hardware to change stuff 'under' the compiler's feet... If C > code is > > > > >>> mapped > > > > >>> onto hardware anywhere - you need to use the 'volatile' keyword > to > > > > > > force > > > > > > > >>> the compiler to re-read the data before use as opposed to using > its > > > > > > own > > > > > > > >>> cached value. > > > > >>> > > > > >>> Just a couple of thoughts... > > > > >>> > > > > >>> Dave > > > > >>> > > > > >>> > > > > >>> On Sunday, 1 July 2018, Thom Cherryhomes < > thom.cherryhomes@gmail.com > > > > >>> > > > > >>> wrote: > > > > >>>> Hello, everyone. > > > > >>>> > > > > >>>> My name is Thom Cherryhomes, and I am both the systems operator > of > > > > >>>> IRATA.ONLINE, and developing a series of terminal programs for > > > > >>>> different > > > > >>>> machines that can connect to the currently running PLATO > systems en > > > > >>>> extant: > > > > >>>> IRATA.ONLINE, and CYBER1.ORG. > > > > >>>> > > > > >>>> I've gotten the vast majority of the terminal written, using > CC65, > > > > > > and > > > > > > > >>>> appropriating some bits of code from other places, namely: > > > > >>>> > > > > >>>> * up2400 for cc65 based on George Hug's user-port 2400 driver. > > > > >>>> https://github.com/nanoflite/c64-up2400-cc65 > > > > > > > >>>> * The swiftlink driver for cc65: > > > > https://github.com/gilligan/snesdev/blob/master/tools/cc65-2.13.2/libsr > > > > > > > >>>> c/c64/c64-swlink.s > > > > >>>> > > > > >>>> * ip65 for ethernet support > https://github.com/oliverschmidt/ip65 > > > > >>>> > > > > >>>> As I said, the terminal is mostly functioning, but I am having > > > > > > problems > > > > > > > >>>> when flow control needs to assert itself, The type of flow > control > > > > > > that > > > > > > > >>>> PLATO supports is XON/XOFF, so I've implemented a threshold > model > > > > > > that > > > > > > > >>>> sends XON/XOFF based on threshold values: > > > > >>>> > https://github.com/tschak909/platoterm64/blob/master/src/io.c#L20 > > > > >>>> > > > > >>>> #define XOFF_THRESHOLD 250 > > > > >>>> #define XON_THRESHOLD 100 > > > > >>>> And this is asserted during the io_recv_serial() which gets > called > > > > >>>> every pass through the main loop: > > > > >>>> > https://github.com/tschak909/platoterm64/blob/master/src/io.c#L20 > > > > >>>> > > > > >>>> I understand that the code as is only works with user-port > devices > > > > >>>> (because up2400 re-uses the kernal structures), these are the > > > > > > devices > > > > > > > >>>> that > > > > >>>> need it most, and I am trying to get these devices working, > before > > > > >>>> I > > > > >>>> refine > > > > >>>> things for the swiftlink cartridge. > > > > >>>> > > > > >>>> However, what happens, is something like this: > > > > >>>> https://www.youtube.com/watch?v=K9VgIigaJzw > > > > >>>> > > > > >>>> and this: > > > > >>>> https://www.youtube.com/watch?v=xjSlCOPXYRk > > > > >>>> > > > > >>>> I'm not entirely sure what's happening here, as the buffer is > > > > > > filling > > > > > > > >>>> up, and draining, and the amount of glitching is directly > > > > > > proportional > > > > > > > >>>> to > > > > >>>> the tiniest bits of changes in my drawing routines. The one > biggest > > > > >>>> cause > > > > >>>> of glitch is the block erase routine (which given a set of pixel > > > > >>>> coordinates, erases an area of the screen...the cc65 > implementation > > > > >>>> draws > > > > >>>> horizontal lines until the bottom of the bounding box is > reached... > > > > > > I > > > > > > > >>>> would > > > > >>>> think this would simply cause the buffer to fill up, which would > > > > > > cause > > > > > > > >>>> xoff > > > > >>>> to trip, stuff would stop being sent, and the buffer would > > > > > > subsequently > > > > > > > >>>> be > > > > >>>> drained until the buffer is empty...but something very subtly > wrong > > > > > > is > > > > > > > >>>> happening. > > > > >>>> > > > > >>>> I have already spent days messing with the threshold values, as > > > > > > well as > > > > > > > >>>> trying to shuffle code around to try and alleviate the problem, > but > > > > > > I > > > > > > > >>>> seem > > > > >>>> to just keep getting the short end of the stick on this one. > > > > >>>> > > > > >>>> Could really use some help, any insights? > > > > >>>> > > > > >>>> Code is here btw: http://github.com/tschak909/platoterm64 > > > > >>>> > > > > >>>> -Thom > > > > > > -- > > > > > > http://hitmen.eu http://ar.pokefinder.org > > > http://vice-emu.sourceforge.net http://magicdisk.untergrund.net > > > > > > Habe ich schon erwähnt, daß mir HDTV/Blueray/HD-DVD völlig am > > > Allerwertesten > > > vorbeigehen? Das derzeitige Programm noch hochauflösender zu sehen, > > > empfinde > > > ich als Drohung. > > > -- > > http://hitmen.eu http://ar.pokefinder.org > http://vice-emu.sourceforge.net http://magicdisk.untergrund.net > > Wer im Glashaus sitzt hat immer frische Gurken. > > > > > > >Received on 2018-07-01 22:02:49
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