The signal on the bus is the same. Just the name is different. So to talk to the part using Linux, use the address in "7-bit" format, which for your part is 0x21.
If you are writing in C, you will use i2c-dev and ioctl If you are writing in Python 2.7, you will use SMbus and something like the Adafruit Python I2C BBB-IO Best regards, --- Graham == On Thu, Jun 25, 2015 at 1:27 AM, 멘지 <[email protected]> wrote: > thank you for your answer > > When the '1' shift is not this lead? > > Then how to i write register in Ov7670 ?? > > I must register modification in OV7670 > > I wonder how to I2C write . > > > *Please understand the lack of my English skills. ^^ ;;;; > > thanks > > > > 2015년 6월 25일 목요일 오전 2시 18분 37초 UTC+9, Graham 님의 말: > >> There is an "8 bit" representation of an I2C address, where the bottom >> bit is actually the Read/Write bit and is, by convention, set to zero to >> describe the address. >> >> There is a "7-bit" representation of an I2C address, where the address is >> shifted one bit to the right, so the read/write bit disappears and is not >> part of the address. >> Half the manufacturers do it one way, the other half the other way. >> >> Linux/Debian uses the 7 bit representation. >> >> 0x42 >> 1 = 0x21 >> >> --- Graham >> >> == >> >> On Wednesday, June 24, 2015 at 3:13:48 AM UTC-5, 멘지 wrote: >>> >>> >>> I'm trying i2c bus on BBB >>> >>> slave module is OV7670 ( CMOS Camera ) >>> >>> OS is angstrom >>> >>> >>> >>> <https://lh3.googleusercontent.com/-zT9VFvtWOmo/VYpkZj8P2MI/AAAAAAAAFDw/Abor6TYsMrg/s1600/dd.png> >>> >>> >>> when i connect ov7670 on BBB P9 Header (19,20) >>> >>> and command i2cdetect -r -y 1 >>> >>> look at the picture above you fine '21' is creating >>> >>> 0x21 is slave address ???? >>> >>> but slave address of ov7670 is 0x42 in datasheet >>> >>> what means 0x21 ?? >>> >>> and >>> >>> am i better try i2c ??? >>> >>> >>> >>> My purpose is writing data to the ov7670 register. >>> >>> >>> Advice please >>> >> -- > 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/c0M35cLIS4Q/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.
