PIC to PIC "wired" serial one-way communication - SERIN2/SEROUT2

[Darrel Taylor]

Hi Roger,

Do you have a Pull-Up resistor on the serial line?

SEROUT2 mode 49548 is Open Collector output. It never drives the line high, so it requires a pull-up.
From your description, it sounds like you just have a 1.2k in series.

Alternatively, you can use mode 16780 which will drive it high.
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[mister_e]

Sounds right... not sure how and why SERIN2 deal with it... how on earth an input could be an open-collector type NO i haven't open the LIB(s)

[Darrel Taylor]

As far as SERIN2 is concerned, it doesn't matter.
49548 and 16780 are the same thing.

But it will make a difference with the SEROUT2.
49548 - open collector output.
16780 - Driven output.
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[flotulopex]

...Do you have a Pull-Up resistor on the serial line?
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Yes, a 10k. The 1k2 resistor is connected between both PICs.

I'll have a try with a driven output.

[flotulopex]

Looking around the Internet for some additional information about IR transmission, I found out that i.e. SONY uses a Pulse Width Modulation protocol that looks simple to implement with PICs (http://www.sbprojects.com/knowledge/ir/sirc.htm).

So instead of trying to establish a "serial" communication, I'll have a go with PULSOUT/PULSIN.

Might be easier since the IR (hardware) layer is already working well.