@Kit-Bishop ... You're the one formi, formidable !!!
after correcting the makefile (home/ ...) and

root@Omega-1B67:~# i2cdetect -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

to change the #define I2C_ADDR with 0x27 in the i2clcd16x2.cpp file.
it's work fine....
Thanks for sharing
Now i can compile C C++ and my LCD works... "c'est la cerise sur le gâteau"

nothing better happen ... c++ c compile toolchain ... .cpp segment .c ... trying python

@Kit-Bishop ... You're the one formi, formidable !!!
after correcting the makefile (home/ ...) and

root@Omega-1B67:~# i2cdetect -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

to change the #define I2C_ADDR with 0x27 in the i2clcd16x2.cpp file.
it's work fine....
Thanks for sharing
Now i can compile C C++ and my LCD works... "c'est la cerise sur le gâteau"

Hello @Kit-Bishop,
wonderfull, can you share your code ... or just explained "To control it, I have adapted some C++ code from the Arduino libraries" !!!
this is what i need !!!

tHanks Before all ... You're so Great !!!

nothing better happen ... c++ c compile toolchain ... .cpp segment .c ... trying python

Thanks for help ... Send you feed back soon ...
I'm trying to make a rf433 remote ...

make[1]: Entering directory /home/gwena/dev/omega/openwrt' make[1]: *** No rule to make target package/helloworld/compile'. Stop.
make[1]: Leaving directory `/home/gwena/dev/omega/openwrt'
make: *** [package/helloworld/compile] Erreur 2

No Help, No Help .... SOS

gwena@MacBookPro:~/dev/omega/openwrt$ make /package/helloworld/compile
ERROR: please fix package/helloworld/Makefile - see logs/package/helloworld/dump.txt for details
Collecting package info: done
make[1] /package/helloworld/compile
make -r /package/helloworld/compile: build failed. Please re-run make with -j1 V=s to see what's going on
make: *** [/package/helloworld/compile] Erreur 1
gwena@MacBookPro:~/dev/omega/openwrt$

makefile:116: *** commands commence before first target. Stop.

NO help ... yet. No compilation too.

Enjoy Omega !!!

"Salut" everybody.

I love python : it was very simple to use, to debug and so ... what about C/C++

i've found a Tuto_C.pdf Tuto on WEB for compiling with SDK.

So i've use this C file helloworld.c and this Makefile Makefile .

I've put them in the /home/user/dev/openwrt/openwrtSDK/package/helloworld

after open console at /home/user/dev/openwrt/openwrtSDK/

make -j1 V=99

compilation abort with this error about obsolete description bloc

make[4]: Entering directory `/home/user/dev/openwrt/openwrtSDK/build_dir/target-mips_34kc_uClibc-0.9.33.2/helloworld'
Makefile:64: *** DESCRIPTION:= is obsolete, use Package/PKG_NAME/description.  Stop.
make[4]: Leaving directory 

`/home/user/dev/openwrt/openwrtSDK/build_dir/target-mips_34kc_uClibc-0.9.33.2/helloworld'
make[3]: *** [/home/user/dev/openwrt/openwrtSDK/build_dir/target-mips_34kc_uClibc-0.9.33.2/helloworld/.built] Error 2

OpenWRT sdk compiling helloword.c

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make[3]: Leaving directory `/home/user/dev/openwrt/openwrtSDK/package/helloworld'

But this command is not in any Makefile ...

Some one can help me please ...

Hello
With i2cset it replies incorrect mode i can use mode b or w ... But i think it's normal ... i've seen this option several times but not very often .

i'm using this process to initialize LCD crystal 2x16 using a pcf8594 I2C 8bit expander port : Tech Docs
So i've tried orther method using python without smbus import...

Peripheri.i2c do that.

I can only turn on/off backlight ...

Thanks for helping .... Oméga it's cool !!¡

a bit of incomplete code ...

#!/usr/bin/python
import i2c
import pyOmega
pyOmega.mSec(100)
#Open i2c-0 controller
chip = i2c.I2C("/dev/i2c-0")
##LCD PROC
def lcd_reset():
chip.transfer(0x27, [i2c.I2C.Message([0xFF])])
pyOmega.mSec(20)
chip.transfer(0x27, [i2c.I2C.Message([0x83])])
chip.transfer(0x27, [i2c.I2C.Message([0x03])])
pyOmega.mSec(15)
chip.transfer(0x27, [i2c.I2C.Message([0x83])])
chip.transfer(0x27, [i2c.I2C.Message([0x03])])
pyOmega.mSec(5)
chip.transfer(0x27, [i2c.I2C.Message([0x83])])
chip.transfer(0x27, [i2c.I2C.Message([0x03])])
pyOmega.mSec(5)
chip.transfer(0x27, [i2c.I2C.Message([0x82])])
chip.transfer(0x27, [i2c.I2C.Message([0x02])])
pyOmega.mSec(5)

def lcd_init():
lcd_reset()
lcd_cmd(0x28)
lcd_cmd(0x0C)
lcd_cmd(0x06)
lcd_cmd(0x80)
lcd_cmd(0x80)

def lcd_cmd(xcmd):
print xcmd

lcd_cmd(0x28)

... i2cset -y 0 0x27 0x00 0x17 0x06 0x4F 0x5B 0x7F i
I've tried this ... but nothing done.

i've found a Python Lib name Periphery but no result yet, just the backlight
The Lib at Github

i'm use this part only : i2c.py

it is very easy with Arduino or Raspi ... some lib missing ...

Some code
#!/usr/bin/python
import i2c
import pyOmega #routines uSec et mSec attente
#Open i2c-0 controller
chip = i2c.I2C("/dev/i2c-0")
chip.transfer(0x27, [i2c.I2C.Message([0x20,0x08])]) #Turn ON retro-Eclairage
sleep(5)
chip.transfer(0x27, [i2c.I2C.Message([0x20,0x00])]) #Turn OFF retro-Eclairage
chip.close()

But nothing more ....