On Fri, Mar 17, 2000 at 12:22:50PM -0800, Fahd Akil wrote:
On your other questions
UARTs - the one builtin to the dragonball (the PilotPro w/ upgrade
uses a second 165x0 for the IrDA only)
RS-232 drivers - a sipex or equivalent level shifter (max3222 type).
IrDA transceiver modules - I think these are temic parts.
> Originally, I though that the DragonBall processor could not reproduce that
> frequency. So, I did some research and discovered that the Philips Pronto
> (which CAN transmit at 455 kHz) remote uses the same processor (Motorola
> DragonBall MC68328 ) as the Palmpilot.
>
> http://www.pcseller.com/Philips_Magnavox_Pronto_TS1000.htm
>
> In fact the Palm Vx and Palm IIIc use the even faster Motorola DragonBall
> MC68EZ328.
>
> I realize the difficulty in learning B&O commands at the 455 kHz frequency.
> But the IR data transmissions of the B&O commands have already been captured
> with an oscilloscope, so no learning capability necessary. I also, have the
> timings and data format for the B&O protocol. The documentation is located
> in the following pdf file:
>
> http://members.aol.com/_ht_a/beodetroit/datalink.pdf
>
> IMHO, All I need now is to write a program that will take the stored
> information and format it and send it to the UART where the 455 kHz
> frequency would modulate the signal prior to transmission. Does this sound
> like it might work with the UART on the DragonBall processor or do I need an
> alternate UART/transceiver to accomplish what I want? Am I missing
> something that is obvious to you true palmpilot/Infrared programmers?
>
> Should I use the palmOS API or should I use assembler to write this program?
You can use a string of capital Us (0x55) hex at a really fast baud
rate (such that 2 bit times = 455khz) and it should produce a very
weak carrier. You may have to disable other interrupts to avoid
dropouts too.
There is a lot of capacitance on the bus so this might not even work.
50-100khz works, but I noticed bandwidth problems.
It would be easier to have a 455kHz separate transmitter triggered by
a control line (I think one is called talelight - I don't have a URL,
but I think they make the IR boosters)
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