ramcte01@ULKYVX.BITNET (NEWS_PERSONALNAME) (02/12/91)
I am posting this for a friend... Since I don't make it onto this newsgroup very often, please mail source code directly to this account as well as posting to handhelds. Thanks! Begin... I am trying to locate a routine for the hp48sx which would be capable of transmitting IR commands to a tv. Has anyone written such code? I have a posting by Michiel Niemeijer & Eric Toone regarding controlling RC5 (PHILIPS equipment) using the 28s. I could repost this if they are no longer on the net. I would greatly appreciate such a routine, or at least guidance on writing such a routine (necessary hooks etc...). For those wishing to take up the challenge, here are a few more details about my specific needs: I want my HP48 to be able to transmit Thomson/RCA Unified Remote/Dimensia ir codes. RCA ir commands are composed as follows: ____ _ ____ ...| |____| |XXXXXXXXXXXXXXXXXXXXXXXX|____| |... ^ ^ ^ <+-><--+---><+-><--+---> ^ ^ | | | | | | | | | | | | | | | | | +- Mark of next | | | | | | | | transmission. | | | | | | | | | | | | | | | +- Repeat Space = 8 mS | | | | | | | _______ | | | | | | +- 8 bits (COMMAND) | | | | | | ________ | | | | | +- 4 bits (PREAMBLE) | | | | | | | | | +- 8 bits (COMMAND) | | | | | | | +- 4 bits (PREAMBLE) | | | | | +- SYNC = .5 mS | | | +- SPACE = 4 mS | +- MARK = 4 mS Namely, a MARK consisting of a logic 1 for 4 mS followed by a SPACE consisting of a logic 0 for 4 mS, followed by a .5 mS logic 1 SYNC pulse, followed by a 4 bit PREAMBLE and an 8 bit COMMAND. The PREAMBLE and COMMAND are both complemented and retransmitted. Finally a repeat SPACE of 8 mS is inserted between transmissions. Where, 1mS ___ A logic bit "1" ==> ______| | .5mS 2mS ___ A logic bit "0" ==> ____________| | .5mS with a carrier frequency of 56.875 kHz (Period = 17.58 uS). Therefore transmission lengths are ALWAYS the same (56.5 mSec). Although the HP uses a carrier frequency of 32.768 kHz (I think), the HP should still work assuming it is placed within a couple of feet of the tv/vcr/etc.. The PREAMBLE denotes the device: PREAMBLES =================== TV 0 VCR1 1 VCR2 2 AM/FM 3 etc.. I don't have time to type in all the COMMANDs, but here are a couple for testing purposes. COMMAND (hex) ================== ON C5 OFF C4 MUTE ON D9 MUTE OFF DA CHANNEL UP D2 CHANNEL DOWN D1 The possible uses for such a routine and the software that could easily be built around it is virtually endless. Couple of simple examples: - a single remote for different pieces of equipment simply by changing the current keymap. - resetting of the tv/vcr time & date after a power failure with a single keypress. - use of the calculators timer abilities to program shows or to add this capability to primitive vcrs. Although the ir commands for many tvs and vcrs are different, most are easily accessible. If someone would be kind enough to provide the machine code to send a single transmission described above, I would be willing to write some truly useful programs, as well as provide the remainder of the ir commands. *** Caution *** Since it is possible to erase tapes, reinitialize the tv's eeprom to factory settings, possibly lock something up, etc., EXPERIMENT AT YOUR OWN RISK. No assurances of performance or usability are neither expressed or implied. Aaron D. =============================================================================== Disclaimer: The above in no way reflects the opinions, beliefs, policy, or actions of my employer, Thomson Consumer Electronics (TCE). =============================================================================== End... Rick McTeague Electrical Engineering Department, Speed Scientific School University of Louisville, Louisville, KY 40292 (502) 588-7020 RAMCTE01@ULKYVX (Bitnet) RAMCTE01%ULKYVX.BITNET@CUNYVM.CUNY.EDU (Internet) {akgua,allegra,cbosgd}!psuvax1!ulkyvx.bitnet!ramcte01 (uucp) I am posting this for a friend... Since I don't make it onto this newsgroup very often, please mail source code directly to this account as well as posting to handhelds. Thanks! Begin... I am trying to locate a routine for the hp48sx which would be capable of transmitting IR commands to a tv. Has anyone written such code? I have a posting by Michiel Niemeijer & Eric Toone regarding controlling RC5 (PHILIPS equipment) using the 28s. I could repost this if they are no longer on the net. I would greatly appreciate such a routine, or at least guidance on writing such a routine (necessary hooks etc...). For those wishing to take up the challenge, here are a few more details about my specific needs: I want my HP48 to be able to transmit Thomson/RCA Unified Remote/Dimensia ir codes. RCA ir commands are composed as follows: ____ _ ____ ...| |____| |XXXXXXXXXXXXXXXXXXXXXXXX|____| |... ^ ^ ^ <+-><--+---><+-><--+---> ^ ^ | | | | | | | | | | | | | | | | | +- Mark of next | | | | | | | | transmission. | | | | | | | | | | | | | | | +- Repeat Space = 8 mS | | | | | | | _______ | | | | | | +- 8 bits (COMMAND) | | | | | | ________ | | | | | +- 4 bits (PREAMBLE) | | | | | | | | | +- 8 bits (COMMAND) | | | | | | | +- 4 bits (PREAMBLE) | | | | | +- SYNC = .5 mS | | | +- SPACE = 4 mS | +- MARK = 4 mS Namely, a MARK consisting of a logic 1 for 4 mS followed by a SPACE consisting of a logic 0 for 4 mS, followed by a .5 mS logic 1 SYNC pulse, followed by a 4 bit PREAMBLE and an 8 bit COMMAND. The PREAMBLE and COMMAND are both complemented and retransmitted. Finally a repeat SPACE of 8 mS is inserted between transmissions. Where, 1mS ___ A logic bit "1" ==> ______| | .5mS 2mS ___ A logic bit "0" ==> ____________| | .5mS with a carrier frequency of 56.875 kHz (Period = 17.58 uS). Therefore transmission lengths are ALWAYS the same (56.5 mSec). Although the HP uses a carrier frequency of 32.768 kHz (I think), the HP should still work assuming it is placed within a couple of feet of the tv/vcr/etc.. The PREAMBLE denotes the device: PREAMBLES =================== TV 0 VCR1 1 VCR2 2 AM/FM 3 etc.. I don't have time to type in all the COMMANDs, but here are a couple for testing purposes. COMMAND (hex) ================== ON C5 OFF C4 MUTE ON D9 MUTE OFF DA CHANNEL UP D2 CHANNEL DOWN D1 The possible uses for such a routine and the software that could easily be built around it is virtually endless. Couple of simple examples: - a single remote for different pieces of equipment simply by changing the current keymap. - resetting of the tv/vcr time & date after a power failure with a single keypress. - use of the calculators timer abilities to program shows or to add this capability to primitive vcrs. Although the ir commands for many tvs and vcrs are different, most are easily accessable. If someone would be kind enough to provide the machine code to send a single transmission described above, I would be willing to write some truely useful programs, as well as provide the remainder of the ir commands. P.S. Since it is possible to erase tapes, reinitialize the tv's eeprom to factory settings, possibly lock something up, etc. Perform the above at your own risk. No assurances of performance or usability are neither expressed or implied. Aaron D. =============================================================================== Disclaimer: The above in no way reflects the opinions, beliefs, policy, or actions of my employer, Thomson Consumer Electronics (TCE). =============================================================================== End... Rick McTeague Electrical Engineering Department, Speed Scientific School University of Louisville, Louisville, KY 40292 (502) 588-7020 RAMCTE01@ULKYVX (Bitnet) RAMCTE01%ULKYVX.BITNET@CUNYVM.CUNY.EDU (Internet) {akgua,allegra,cbosgd}!psuvax1!ulkyvx.bitnet!ramcte01 (uucp)
diamant@hpfcbig.SDE.HP.COM (John Diamant) (02/14/91)
> I want my HP48 to be able to transmit Thomson/RCA Unified Remote/Dimensia > ir codes. > - a single remote for different pieces of equipment simply by changing the > Although the ir commands for many tvs and vcrs are different, most are easily > accessible. If someone would be kind enough to provide the machine code to > send a single transmission described above, I would be willing to write some > truly useful programs, as well as provide the remainder of the ir commands. Great! As far as I know, no one has done this yet. Sorry I can't answer your IR question, but I would like to suggest that you write the program to work as a learning remote, rather than hardcoded with a particular command set (maybe in addition to a built in command set -- to access features not on a particular remote, but on the receiving unit). Ideally, the program would be modular enough that the IR routine could be added to several different types of remote control programs (the IR receiver/generator portion may be the only part that must be written in ML for performance). John Diamant Software Engineering Systems Division Hewlett Packard Co. ARPA Internet: diamant@hpfclp.sde.hp.com Fort Collins, CO UUCP: {hpfcla,hplabs}!hpfclp!diamant This response does not represent the official position of, or statement by, the Hewlett-Packard Company. The above data is provided for informational purposes only. It is supplied without warranty of any kind. I do not work for the calculator division, even though I do work for HP. I just happen to be a 48SX user. P.S. This note is also emailed to the account as requested.
amonson@wombat.ee.uidaho.edu (Paul Amonson) (02/16/91)
I agree, a learning remote would much better than a fixed hard coded one. If someone has the specs for the IR input and IR output ports I would attempt to write the program! At 2 MHz in machine code it should be fast enough to sample accuratly. Paul Amonson amonson@wombat.ee.uidaho.edu (amonson@129.101.102.3)