On Thu, 29 Oct 2020 10:23:39 -0700 (PDT), in
gmane.comp.hardware.beagleboard.user Paul Beam
<[email protected]> 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)
"""
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)
--
Dennis L Bieber
--
For more options, visit http://beagleboard.org/discuss
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