iMac + IrDA

iMac + IrDA

[Gerd Knorr]

  Hi !

Anyone tried to use the IrDA port of the Rev. A+B iMacs?  According to the
IrDA people I should see some packages coming in if I look at the port
while some other IrDA device tries to connect.  But I see nothing with
minicom.

The IrDA port is /dev/ttyS1, the device-tree entry looks like this:

macintoy kraxel /proc/device-tree/pci/mac-io/escc/ch-b# proc
name                      : ch-b\0
device_type               : serial\0
compatible                : chrp,es3\0
built-in                  : 
reg                       : \0\x010\0\0\0\0\x01\0\x010\x10\0\0\0\x01\0\x010@\0\0\0\x01\0\0\x86\0\0\0\x01\0\0\0\x87\0\0\0\x01\0
interrupts                : \0\0\0\x10\0\0\0\x06\0\0\0\x07
AAPL,interrupt-vectors    : \0\0\0\x17\0\0\0\x01\0\0\0\0
AAPL,interrupt-priorities : \0\0\0\x04\0\0\0\x04\0\0\0\x04
AAPL,interrupts           : \0\0\0\x15\0\0\0\x16\0\0\0\x17
interrupt-parent          : \xff\x86G\x10
slot-names                : \0\0\0\x01IrDA\0
AAPL,address              : \x80\x810\0\x80\x810\x10\x80\x810@\x80\x80\x86\0\x80\x80\x87\0
driver-ist                : \0\x05\x91\xa0\0\0\0\x0b\0\x05\x91\xa0\0\0\0\x0c\0\x05\x91\xa0\0\0\0\x0d

/dev/ttyS0 (the buildin modem) works fine with minicom.  Any hints where
to look / what to check?

  Gerd

-- 
system("logout");


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Re: iMac + IrDA

[Paul Mackerras]

Gerd Knorr <kraxel@goldbach.in-berlin.de> wrote:

> Anyone tried to use the IrDA port of the Rev. A+B iMacs?  According to the
> IrDA people I should see some packages coming in if I look at the port
> while some other IrDA device tries to connect.  But I see nothing with
> minicom.

I did some investigation of the IrDA port on my iMac using an
oscilloscope.  It appears that to get the IrDA codec to start
receiving, you need to send a series of pulses on the DTR, RTS and TxD
lines.  I don't have the details handy.  I didn't get very far because
the only other IrDA implementation I had was macos on my powerbook
3400, which crashes whenever I try to make an IrDA connection to it.

Paul.

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