1. The DS2406 has a "Channel access" command that at it's most basic level, can send a stream of bits to the PIO channel. 2. We can add delays to the write to slow down to any speed. 3. Clearly other bus activity has to be supressed while writing this data stream. 4. This is more a character device than block device model, which is why it wasn't implemented. 5. Implementation wouldn't be difficult. I envision a "echo "Long string" > /DS2406/serial1200.A
6. microprocessors as slaves is technically feasible, but has patent problems. 7. There are chips with 1-wire and 3-wire interfaces, as well as the DS2408 as a front-end for a uprocessor. Paul Alfille On 7/9/06, rohbags <[EMAIL PROTECTED]> wrote: > > I guess thats the limitation. If 1-wire/owfs can transmit at a constant > steady bit rate, say 1200bps, 2400bps or even its default 16.1kbps then it > would be possible to make a 1wire IR Tx'er. Otherwise precise timing > control would be needed over the 1wire device and im sure thats impossible > (say high 40ms then low 10ms then high 20ms etc). > > I know there's a lot of info on the net about using PICs as 1wire masters, > but can they run as slaves by themselves instead? Or would I still need a > ds2406 to feed the PIC its data(code to IR transmit) and then some sort of > magic packet/EOF to tell the PIC to send the code once it's completely > stored in the PIC? > > A PIC would cut down the parts needed, and would totally remove the need > to have a 555 for a carrier signal. I guess a PIC could even be programmed > via the 1wire to run on different carrier signals on the fly, that would > be cool :) > > I guess even a 2nd ds2406 (or the dual channel SMD version) could pull a > PIC i/o high while transmitting and then pull it low again to signal the > PIC to transmit IR code it just buffered. > > Would be nice if a PIC could act as a slave without any ds* chips, can they? > > Thanks, > > Rohan. > > > Eric Vickery wrote: > > I think that would be pretty hard in 1-Wire. I'm not sure the 1-Wire > > data stream would be consistent enough for IR communications. I think > > using something like a PIC would be a better route, plus you can get > > some PICs for a good bit cheaper than the DS2406. > > > > My $0.02 > > > > Eric > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of > > rohbags > > Sent: Sunday, July 09, 2006 5:24 PM > > To: owfs-developers@lists.sourceforge.net > > Subject: Re: [Owfs-developers] DS2406 - output bytes in serial fashion? > > > > > > Hi Paul, > > > > Basically it would only need to push out bit rates between 1000 and 4000 > > bits per second. The carrier signal is typicaly 38 or 40 KHz in most > > consumer devices and a 555 would be an easier way to run this carrier. > > > > So if the ds2406 (or ds2408, but 2406 prefered) could push out a stream > > of 1-4Kbps it could work. > > > > I have a few little adhoc 1wire circuits here which use 2406's and/or > > 2408's. I know the 2408 can be sent a byte at a time, but then I'd need > > a parallel-to-serial convertor IC to feed the IR led unless the 2408 can > > output its byte in serial fahion over one of its output bits. I think I > > would need some sort of timing to latch the parallel-to-serial chip as > > well, which would be a different freq to the carrier 555 so would need a > > 2nd 555 or a 556 dual timer IC. > > > > It would be great if it was possible to echo a word to a ds2406 like: > > #echo "0101010100010101" > /dev/1wire/*ds2406 device IO A* and *somehow* > > have it output at a set data rate (1200, 1600, 2400, 3800, > > etc) ...any chance a ds2406 could do that? > > > > The grand idea would be to implement some sort of /dev/lirc device that > > could use the standard lirc package to transmit IR data via a 1wire > > transmitter. > > > > Thanks, > > > > Rohan. > > > > > > Paul Alfille wrote: > >> 1. The DS2408 seems like a better choice -- ot has 8 bites and a > >> special mode (that isn;t currently implemented in OWFS) to do serial > >> handshaking. > >> > >> 2. The 1-wire but is serial -- 1 bit at a time. OWFS doesn everything > >> in bytes, except the search algorithm, but that jut means bit-banging > >> 8 bites, or doing higher level read/writes if the adapter supports it. > > > >> The adapter will do bit-level communication. > >> > >> 3. There is no "slave" to "slave" communication, so it's better to > >> keep the data on the master. > >> > >> So the real question is what data rate does your IR expect? At regular > > > >> speed, and with special modes, you can output 16k bits/sec = 2k Bytes/ > > > >> sec. (Less any communication overhead). > >> > >> Paul Alfille > >> > >> On 7/9/06, rohbags <[EMAIL PROTECTED]> wrote: > >>> Hi everyone, > >>> > >>> Just wondering if anyone knows if there would be any limitations to > >>> attempting to get a DS2406 to output bytes (words) at a time instead > >>> of bits? > >>> > >>> The idea is to get a DS2406 to output a IR code in a serial fasion, > >>> and its output then go through a 38/40KHz carrier signal to pulse a > >>> IR Tx led. > >>> > >>> ie: a 1-Wire Infra-Red Transmitter, perfect for remote control of air > > > >>> conditioners with IR remote controls. > >>> > >>> I know it could be done with PIC's, but would be nice to have a very > >>> simple Tx circuit for the DS2406. > >>> > >>> They have 1024 bits of EPROM but no RAM, so data would have to be > >>> transmited over the 1wire bus in real time I would presume, can the > >>> 1w bus send whole words at a time instead of just bit after bit after > > > >>> bit? > >>> > >>> Could another 1w EEPROM (like the DS2431 1024-bit EEPROM) be used to > >>> store the bytes then push it all as one word to a DS2406 (or > >>> something like that)? ..or is that getting too close to a PIC setup > >>> anyway and might as well go PIC anyway? > >>> > >>> Any ideas? > >>> > >>> > >>> Cheers, > >>> > >>> Rohan. > >>> > >>> > >>> > >>> > >>> --------------------------------------------------------------------- > >>> ---- > >>> Using Tomcat but need to do more? Need to support web services, > >>> security? > >>> Get stuff done quickly with pre-integrated technology to make your > > job > >>> easier > >>> Download IBM WebSphere Application Server v.1.0.1 based on Apache > >>> Geronimo > >>> > > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > >>> _______________________________________________ > >>> Owfs-developers mailing list > >>> Owfs-developers@lists.sourceforge.net > >>> https://lists.sourceforge.net/lists/listinfo/owfs-developers > >>> > >> > > > > > > > > > > ------------------------------------------------------------------------ > > - > > Using Tomcat but need to do more? Need to support web services, > > security? Get stuff done quickly with pre-integrated technology to make > > your job easier Download IBM WebSphere Application Server v.1.0.1 based > > on Apache Geronimo > > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > > _______________________________________________ > > Owfs-developers mailing list Owfs-developers@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > > > > > > > ------------------------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, security? > Get stuff done quickly with pre-integrated technology to make your job easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers > ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? 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