Will toggle view between regular and hex editor. Unfortunately switching between these views somehow modifies the file. It'd be great if it haven't had any side effects. Maybe someone knows a better way to do it.
noremap <F10> :call HexMe()<CR>
let $in_hex=0
function! HexMe()
set binary
set noeol
if $in_hex>0
:%!xxd -r
let $in_hex=0
else
:%!xxd
let $in_hex=1
endif
endfunction