Hi !!
I'm facing problem with Custom I2C cape. It's I/o Expander using NXP's
PCF8574T Expander chip. I'm unable to detect it. I tried every thing
available on web. Can you help me ? please ?
Here is some output.
root@beaglebone:~# uname -a
Linux beaglebone 3.8.13 #1 SMP Wed Sep 4 09:09:32 CEST 2013 armv7l GNU/Linux
root@beaglebone:~# i2cdetect -y -r 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- UU -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- 34 -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root@beaglebone:~# i2cdetect -y -r 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- UU UU UU UU -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root@beaglebone:~# i2cdetect -y -r 2
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: 20 -- 22 -- 24 -- 26 -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
I'm using Beaglebone Black Rev B.
Hope Listen form you soon.
Thanks.
On Thursday, July 17, 2014 9:17:40 PM UTC+5:30, Johan Korten wrote:
>
> I managed to make my own cape (for two XBee modules). It works very well
> (even sending between the two modules and to the third one on the
> computer), but:
>
> if I use node ./eeprom.js
>
> I suspect that my cape is expected to be connected to the fourth (or third
> if you start counting at 0) i2c bus:
>
> /sys/bus/i2c/drivers/at24/3-0057/eeprom instead of
> /sys/bus/i2c/drivers/at24/1-0057/eeprom
>
> So should I fix that in my cape (my cape is default at
> /sys/bus/i2c/drivers/at24/1-0057
> but can be configured to go from /sys/bus/i2c/drivers/at24/1-0054 ..
> /sys/bus/i2c/drivers/at24/1-0057)
>
> Apart from that, I managed to program the eeprom and get it working, but
> since it uses UART 2 and UART 5 I needed to change /boot/uboot/uEnv.txt
> to get that working (BBB Rev B so that is why I needed to
> change /boot/uboot/uEnv.txt instead of /media/BEAGLEBONE/uEnv.txt), but do
> I need to supply that with my final version somewhere or is it enough to
> put that in the manual?
>
> Sincerely,
> Johan
>
>
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