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8devices Community :: View topic - i2c
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i2c
https://www.8devices.com/community/viewtopic.php?f=13&t=833		 Page 1 of 2
Author:  kajotsoft [ 28 Oct 2014, 13:15 ]
Post subject:  i2c
Hi

I have a question about i2c support. According to viewtopic.php?f=5&t=416 (tty post from 27 May 2013, 11:03) it is supported in openwrt. I take the latest openwrt code (14.07), compile image as it was suggested, but I can not get it working (my RTC clock is MCP79401 is connected to GPIO_18 - SDA and GPIO_19 - SCL with 2k2 pullup resistors to +3V3, I've configure it with echo i2c-gpio-custom bus0=0,18,19 > /etc/modules.d/66-i2c-gpio-custom).
How I should use i2c-tools to get it working?
Author:  FPeter [ 28 Oct 2014, 14:19 ]
Post subject:  Re: i2c
Author:  kajotsoft [ 28 Oct 2014, 14:25 ]
Post subject:  Re: i2c
Hi,
thanks for fast answer, responses below:

root@OpenWrt:~# i2cdetect -l
root@OpenWrt:~# i2cdetect -y 0
Error: Could not open file `/dev/i2c-0' or `/dev/i2c/0': No such file or directory
Author:  FPeter [ 28 Oct 2014, 14:33 ]
Post subject:  Re: i2c
Author:  kajotsoft [ 28 Oct 2014, 14:42 ]
Post subject:  Re: i2c
dmesg | grep -i i2c
[ 11.900000] Custom GPIO-based I2C driver version 0.1.1
[ 11.910000] i2c-gpio i2c-gpio.0: using pins 18 (SDA) and 19 (SCL)

lsmod | grep i2c
i2c_gpio_custom 880 0

so you're right, I load it by:

insmod i2c-dev

lsmod | grep i2c
i2c_dev 4064 0
i2c_gpio_custom 880 0

i2cdetect -l
i2c-0 i2c i2c-gpio0 I2C adapter

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

thanks :)

how can I now read data from RTC? (how to use i2cget?)
Author:  FPeter [ 28 Oct 2014, 14:57 ]
Post subject:  Re: i2c
Author:  kajotsoft [ 28 Oct 2014, 14:59 ]
Post subject:  Re: i2c
thanks for help, if you can share some C code to deal with i2c I will be grateful

thanks for help
Author:  FPeter [ 28 Oct 2014, 15:21 ]
Post subject:  Re: i2c
Author:  kajotsoft [ 28 Oct 2014, 15:24 ]
Post subject:  Re: i2c
thank you :)
Author:  tty [ 28 Oct 2014, 19:23 ]
Post subject:  Re: i2c
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