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Michael -- On Tue, Mar 5, 2013 at 10:55 AM, Michael Powell <mwpowellhtx@gmail.com> wrote: > > On Tue, Mar 5, 2013 at 11:13 AM, Michael Powell <mwpowellhtx@gmail.com> > wrote: > > > > In particular for linux/i2c-dev.h, and in particular in particular, > > for the i2c_smbus_write_i2c_block_data keyword. This should be available in the i2c-dev.h file installed by i2c-tools. > > I've installed libi2c-dev, which i2c_smbus_write_i2c_block_data > > apparently depends upon; i2c-tools won't do the trick. It should work. You have to make sure that you build and install i2c-tools (or, at least, the i2c header, since it's pretty low-level and just relies on linux headers and inline functions) into your cross-compiling root/staging area (so that your ARM compiles "see" the include file). Without knowing how you're setting up your root/stage area, I can't give you more specific instructions. > > When I build for x86, it works. When I build using our ARM > > crosstool-ng cross compiler, the process complains about; > > i2c_smbus_write_i2c_block_data. It sounds like the i2c-dev.h file isn't getting installed into a place where the ARM builds can find it. (This is the version from i2c-tools -- the kernel version doesn't have the inline functions, possibly for the reasons that I listed elsewhere...) So you end up with either: 1. Using the up-to-date kernel versions, but you need to write your own (fairly trivial) functions to do the marshalling and ioctl calls: #include <linux/i2c.h> #include <linux/i2c-dev.h> 2. Using the i2c-dev.h file from i2c-tools, which incorporates (probably slightly-out-of-date) versions of the above two files, and includes the inline functions: #include <i2c-dev.h> /* note, no "linux/"! */ Does that do the trick? Best regards, Anthony Foiani -- For unsubscribe information see http://sourceware.org/lists.html#faq
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