It is much simpler than you think. Look into the bq chip technical reference
manual:
the BQ28Z610 uses a series of 2-byte standard I2C commands with a 7-bit
device address of 0x55 (8 bits = 0xAA to write and 0xAB to read).
You just have to know that Linux uses 7-bit addresses.
I.e. use i2cget with 0x55.
Or use i2cdetect to find out on which address the chip is really responding.
> Am 29.10.2020 um 20:33 schrieb Paul Beam <rpaulb...@gmail.com>:
>
> Thanks. This part is totally confusing me. It is supposed to be an
> "upgrade" of a part I have been using. I guess my time is better spent
> getting the TI driver to work instead of accessing the registers directly,
> which is what I had been doing.
>
> On Thu, Oct 29, 2020 at 3:08 PM Dennis Lee Bieber <dennis.l.bie...@gmail.com>
> wrote:
> On Thu, 29 Oct 2020 10:23:39 -0700 (PDT), in
> gmane.comp.hardware.beagleboard.user Paul Beam
> <rpaulbeam-re5jqeeqqe8avxtiumw...@public.gmane.org> wrote:
>
> >Does the Beaglebone support 8 bit I2c addresses? I'm using a TI bq28z610
>
> Which Beaglebone?
>
> >which has I2C address 0xAA, but I cannot access it via i2ctools. I can
>
> Per the BBB TRM (TI SPRUH73P)
> """
> 21.1.1 I2C Features
> The general features of the I2C controller are:
> • Compliant with Philips I2C specification version 2.1
> • Supports standard mode (up to 100K bits/s) and fast mode (up to 400K
> bits/s).
> • Multimaster transmitter/slave receiver mode
> • Multimaster receiver/slave transmitter mode
> • Combined master transmit/receive and receive/transmit modes
> • 7-bit and 10-bit device addressing modes
> • Built-in 32-byte FIFO for buffered read or writes in each module
> • Programmable clock generation
> • Two DMA channels, one interrupt line
> """
>
> BB-AI TRM
> """
> The multimaster HS I2C controllers have the following features:
> • Compliant with Philips I2C specification version 2.1
> • Supports a standard mode (up to 100 kbps) and fast mode (up to 400 kbps)
> • Supports HS mode for transfer up to 3.4 Mbps (only for I2C3, I2C4 and
> I2C5)
> • 7-bit and 10-bit device addressing modes
> • General call
> • Start/Restart/Stop
> • Multimaster transmitter/slave receiver mode
> • Multimaster receiver/slave transmitter mode
> • Combined master transmit/receive and receive/transmit mode
> • Built-in FIFOs (16 bytes) for buffered read or write
> • Module enable/disable capability
> • Programmable multislave channel (responds to four separate addresses)
> """
>
vvv here is the important info
> Per
> https://www.totalphase.com/support/articles/200349176-7-bit-8-bit-and-10-bit-I2C-Slave-Addressing#8bit
> 8-bit addressing is not a proper I2C addressing mode.
>
> Your xAA is probably address x55 with read/write bit 0 (write)
^^^ here is the important info
>
>
>
> --
> Dennis L Bieber
>
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