This would be so mucj easier if as with microschip it was in the source
files. Aftee all everything else about the configuration of the mci is
jandled tjere so why not fuses.
Jim
On Jul 21, 2016 11:46 AM, "Paul "LeoNerd" Evans" <leon...@leonerd.org.uk>
wrote:
> On Thu, 21 Jul 2016 22:01:40 +1000
> Erik Christiansen <dva...@internode.on.net> wrote:
>
> > I wouldn't go to the trouble of a C program, but do it with a lot less
> > lines of awk, but that's just taste.
>
> That's not going to help.
>
> E.g. on the tiny841,
>
> #define LFUSE_DEFAULT (FUSE_SUT_CKSEL0 & FUSE_SUT_CKSEL2 & \
> FUSE_SUT_CKSEL3 & FUSE_SUT_CKSEL4 & FUSE_CKDIV8)
> #define HFUSE_DEFAULT (FUSE_SPIEN)
> #define EFUSE_DEFAULT (0xFF)
>
> That doesn't help directly, as you need to know the values of those
> individual FUSE_* constants. OK, so they are:
>
> #define FUSE_SUT_CKSEL0 (unsigned char)~_BV(0)
> #define FUSE_SUT_CKSEL1 (unsigned char)~_BV(1)
> #define FUSE_SUT_CKSEL2 (unsigned char)~_BV(2)
> #define FUSE_SUT_CKSEL3 (unsigned char)~_BV(3)
> #define FUSE_SUT_CKSEL4 (unsigned char)~_BV(4)
> ...
>
> Alright. Um we're going to need _BV(). Except that isn't found in this
> file. I'll have to follow the #include chain.
>
> So now I need to understand how #include works. And #define.
>
> And *then* I'm going to have to understand the ~ and & operators, along
> with the << operator of _BV's actual definition.
>
> Or; I could just generate/compile/run the following C program:
>
> #include <avr/io.h>
> printf("lfuse=%02x:hfuse=%02x:efuse=%02x\n",
> LFUSE_DEFAULt, HFUSE_DEFAULT, EFUSE_DEFAULT);
>
> and out comes the answer directly without my having to do any other
> work.
>
> Big spoiler: I already wrote lots of code for doing exactly this kind
> of "please get me values out of system .h files":
>
> https://metacpan.org/pod/ExtUtils::H2PM
>
> So in practice I'll just be running that.
>
> --
> Paul "LeoNerd" Evans
>
> leon...@leonerd.org.uk | https://metacpan.org/author/PEVANS
> http://www.leonerd.org.uk/ | https://www.tindie.com/stores/leonerd/
>
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