[ts-7000] Re: TS-7KV PLD Registers - simple code seg faults - ne suggestions

["Matt Godbolt" <>]

--- In  "mattsaintdev" <> wrote:
>
> Hi all,
> 
> Spotted the rewrite of the Getting Started with the TS-7KV manual and 
> must say its much clearer now - thanks.
> 
> Wrote the following test program to learn how to read the PLD regs, 
> but the only output is the first two printf lines. As soon as the 
> code accesses the PLD_REGS i get a segfault.
> 
> Ne suggestions?
> 
> Matt
> 

My guess is the call to mmap() is failing and thus retuning MAP_FAILED
(-1), which you then dereference later on.  mmap() is possibly failing
as you're passing a length of '0xff' and not a multiple of a single
page (getpagesize()).  It's always worth checking for failure and then
checking errno - you've probably got an EINVAL:

    EINVAL We don't like start or length or offset.  (E.g.,  they  are
 too large, or not aligned on a page boundary.)

Cheers,

Matt
(another one!)






 
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