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I've created a macro to add a piece of code.
The macro runs fine.
But when added to .vimrc, it reports error.
(The macro becomes weird when paste here.)
let @p='iprocess (clk, resetn)
€kbbegin
if (resetn = '0') then
€kbelse€kbif (clk'event and clk = '1') then
€kbend if;
€kbend if;
€ku€@7€kb€kb€kb€kd€kuprocess;q€kb'
The way you initialize has two flaws:
First, it is usually better to use setreg() to set the value of a register, it is more robust than let @X = and allows you to choose the type of the register (characterwise, linewise, blockwise)
Second, your string contains the keycode of some key (e.g. ^M for <CR>). I guess that you recorded your macro and tried to get what you recorded and that's what caused the problem. In your vimrc you need to write the following:
call setreg('p', "iprocess (clk, resetn)^M€kbbegin^Mif (resetn = '0') then^M")
where ^M is not entered manually but is entered by pressing Ctrl+v then Enter this allows you to write the keycode of the key which setreg() can then interpret properly. Note that you should do that with the others special keys like <Esc> for example.
Edit As mentioned by @Rich in the comments using \<CR> inside a double quoted string is arguably more robust than <C-v><CR>.
See:
\<CR> can be used instead of CTRL-V Enter? It's arguably more robust, especially when copy/pasting answers from SE sites!
call setreg('p', "iprocess (clk, resetn)^M€kbbegin^Mif (resetn = '0') then^M")note that the^Mshould be added by pressing<C-v><CR>in insert mode to enter the keycode of the return key.