Hi, Thanks for reply. The pullup resistor which is using in I2C Bus is 10K with 3.3V.
Regards, Prakash On Wed, Sep 3, 2014 at 12:10 AM, Gerald Coley <[email protected]> wrote: > What size pullup resistors are you using on the I2C bus? > > Gerald > > > On Tue, Sep 2, 2014 at 12:29 PM, <[email protected]> wrote: > >> 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 >>> >>> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/eosKBg3yKHw/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
