I2C interface

Christian Mauderer oss at c-mauderer.de
Fri Feb 12 16:28:57 UTC 2021

Hello Matthew,

in theory it should be possible to use read / write together with some 
ioctls to set the address. But normally I would suggest to create 
i2c_msg structures for a finer grained control. Take a look at the 
i2cget command for a simple example hot to read from an EEPROM like device:


The i2c.h that gedare mentioned has some more details about the meaning 
of the fields:


Best regards


On 12/02/2021 17:20, Gedare Bloom wrote:
> the linux api is exported via cpukit/include/dev/i2c/i2c.h
> the include path should be #include <dev/i2c/i2c.h>
> I'm not aware of any good examples to follow. The embedded brains
> folks have most experience working with it.
> On Thu, Feb 11, 2021 at 8:51 AM Matthew J Fletcher <amimjf at gmail.com> wrote:
>> Hi,
>> The ATSAM BSP has I2C support, but i am slightly unclear about the API that should be used to access it.
>> Using pread() & pwrite() seems to trigger assertions that look like memory corruption in atsam_i2c_bus.c
>> The linux I2C userspace API seems to be suggested, which looks like ioctrl(), but there is also a i2c_smbus_write_byte() type interface.
>> regards
>> ---
>> Matthew J Fletcher
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