Re: LIRC using with directly wiring the RPI3-1 (GPIO18) and (GPIO17) on RPI3-2.

 I made sure that I am using the latest lirc_rpi which is from media branch.
Switched the lirc_rpi.ko to the one built using
https://github.com/bengtmartensson/lirc_rpi/tree/media
I call it lirc_rpi.ko.noir.

cd /lib/modules/4.9.35-v7+/kernel/drivers/staging/media/lirc/
sudo service lirc stop
sudo modprobe -r lirc_rpi
sudo rm lirc_rpi.ko
sudo ln -s  lirc_rpi.ko.noir lirc_rpi.ko
sudo service lirc start

pi@S-SquareCam:/lib/modules/4.9.35-v7+/kernel/drivers/staging/me
dia/lirc $ ls -ltra
total 152
-rw-r--r-- 1 root root 23488 Jul  5 14:09 lirc_serial.ko
-rw-r--r-- 1 root root 20220 Jul  5 14:09 lirc_sasem.ko
-rw-r--r-- 1 root root 20696 Jul  5 14:09 lirc_imon.ko
drwxr-xr-x 3 root root  4096 Jul  5 14:09 ..
-rw-r--r-- 1 root root 22568 Oct 29 17:23 lirc_rpi.koOriginal
-rwxr----- 1 root root 25058 Oct 29 18:49 lirc_rpi.ko.hardpwm
-rwxr----- 1 root root 22593 Oct 29 18:51 lirc_rpi.ko.noir
lrwxrwxrwx 1 root root    16 Oct 31 06:00 lirc_rpi.ko -> lirc_rpi.ko.noir
drwxr-xr-x 2 root root  4096 Oct 31 06:00 .
Added "frequency 0" /etc/lirc/lircd.conf
  name  DOCKTALK
  bits           16
  flags SPACE_ENC|CONST_LENGTH
  eps            30
  aeps          100

  header       9123  4487
  one           620  1655
  zero          620   517
  ptrail        616
  repeat       9122  2217
  pre_data_bits   16
  pre_data       0xFF
  gap          108499
  toggle_bit_mask 0x0
  frequency 0

Restarted both RPIs:

sudo service lirc stop
sudo modprobe --verbose lirc_rpi gpio_out_pin=18 gpio_in_pin=17
sudo service lirc start


pi@S-SquareBase:~ $ dmesg | grep lir
[    3.013380] lirc_dev: IR Remote Control driver registered, major 243
[    3.027374] lirc_rpi: module is from the staging directory, the quality is unknown, you have been warned.
[    4.091745] lirc_rpi: auto-detected active high receiver on GPIO pin 18
[    4.092058] lirc_rpi lirc_rpi: lirc_dev: driver lirc_rpi registered at minor = 0
[    4.092065] lirc_rpi: driver registered!
[    5.402315] input: lircd as /devices/virtual/input/input1
[  124.066311] input: lircd as /devices/virtual/input/input2
[  141.773024] lirc_rpi: cleaned up module
[  141.822748] lirc_dev: module unloaded
[  290.565139] lirc_dev: IR Remote Control driver registered, major 243
[  290.565353] lirc_rpi: module is from the staging directory, the quality is unknown, you have been warned.
[  291.623941] lirc_rpi: auto-detected active high receiver on GPIO pin 18
[  291.624234] lirc_rpi lirc_rpi: lirc_dev: driver lirc_rpi registered at minor = 0
[  291.624241] lirc_rpi: driver registered!
[  291.644062] input: lircd as /devices/virtual/input/input3
[  401.087900] input: lircd as /devices/virtual/input/input4
pi@S-SquareBase:~ $
 
When I do an irsend of RPI3-1 I don't receive the command while running a python script irreceive.py on RPI3-2. With the IR HW connected to both the RPI3s, I used to receive using irreceive.py.
Do I need to invert or change the pin high/low?
Thank you all for your help.
raj


    On Tuesday, October 31, 2017, 3:41:30 AM CDT, Bengt Martensson <[email protected]> wrote:  
 
 On 10/30/17 20:40, Rajendra Panchal wrote:
> Hi All:
> 
> My goal is to replace the IR transmitter and IR receiver  with a wire 
> between two RPI3.
> 
> Thanks to the detailed instructions in:Compiling a kernel module for the 
> raspberry pi 2 - Lost in Details 
> <https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjEh72E7pjXAhVp64MKHXmuAPMQFgg7MAA&url=http%3A%2F%2Flostindetails.com%2Fblog%2Fpost%2FCompiling-a-kernel-module-for-the-raspberry-pi-2&usg=AOvVaw0t4O4Sdr7HJxNL-sMytnmK>
> 
> I successfully rebuilt the kernel with both the LIRC modules:
> 
> https://github.com/bengtmartensson/lirc_rpi
> 
> https://github.com/Al-/lirc_rpi_hardpwm

You need no modulation, not hardware PWM modulation. That driver solves 
a problem that is not relevant for you. It appears not to "frequency 0" 
capable. If you want to us that one, you have to ask its author for 
support.

Setting softcarrier=0 MIGHT work as alternative to FREQUENCY 0 in 
lircd.conf. Look in the system log for messages.

You are using the latest (upstream) Lirc?

Greetz,

Bengt

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