.config/nvim/coc-settings.json

 {
-    "languageserver": {
-        "ccls": {
-            "command": "ccls",
-            "filetypes": ["c", "cpp", "cuda", "objc", "objcpp"],
-            "rootPatterns": [".ccls-root", "compile_commands.json"],
-            "initializationOptions": {
-                "cache": {
-                    "directory": ".ccls-cache"
-                },
-                "client": {
-                    "snippetSupport": true
-                }
-            }
-        }
-    },
     // diagnostic-languageserver
     "diagnostic-languageserver.enable": true,
     "diagnostic-languageserver.mergeConfig": false,
@@ -158,6 +143,7 @@
       "ACTL",
       "ADDRE",
       "ALGO",
+      "ALTA",
       "ARTCSP",
       "ASIC",
       "ASYNCH",
@@ -179,6 +165,7 @@
       "AwesomeWM",
       "BANKB",
       "BAUDRATE",
+      "BBPR",
       "BKSWRST",
       "BOOTPROT",
       "BTreeMap",
@@ -191,6 +178,7 @@
       "Bootprotection",
       "Brusell",
       "Buildroot",
+      "CACHERAM",
       "CARCFG",
       "CBOR",
       "CBPDIS",
@@ -226,17 +214,50 @@
       "Conv",
       "Cpuram",
       "Ctype",
+      "DALL",
+      "DARCHITECTURE",
+      "DARM",
+      "DBBPR",
+      "DBGT",
+      "DCURRENT",
+      "DDEBUG",
+      "DDMA",
       "DEBOUNCEN",
+      "DEXTERNAL",
+      "DFAMILY",
+      "DFLPR",
+      "DFPGA",
+      "DGLOBAL",
+      "DGMRAM",
+      "DGUNILLAS",
+      "DHALTIUM",
+      "DHFV",
       "DIAG",
+      "DINTERNAL",
       "DIRCLR",
+      "DLCS",
+      "DLILIUMSOC",
       "DMA",
+      "DMAIN",
+      "DNRF",
+      "DNVM",
       "DPLLCTRLA",
       "DPLLCTRLB",
       "DPLLRATIO",
+      "DPPR",
+      "DPRODUCT",
+      "DRADIO",
       "DRNGSEED",
+      "DRTL",
       "DSCR",
+      "DSEC",
+      "DSECURE",
+      "DSTM",
       "DSU",
+      "DSYSCTRL",
+      "DSYSTEM",
       "DUT's",
+      "DVERSION",
       "DWT",
       "Damiano",
       "Danaux",
@@ -266,6 +287,7 @@
       "EXTI1",
       "EXTI2",
       "EXTI3",
+      "EXTMEM",
       "Enhetsvektor",
       "Epostadress",
       "Eposthistoriken",
@@ -275,6 +297,7 @@
       "FFI",
       "FILTE",
       "FLASHSIZE",
+      "FLPR",
       "Feriejobb",
       "Flashmode",
       "Flashmodes",
@@ -288,6 +311,7 @@
       "GHA",
       "GHAS",
       "GHASH",
+      "GMRAM",
       "GND",
       "GPIO",
       "GPIOA",
@@ -296,6 +320,7 @@
       "GPIOI",
       "GPIOTE",
       "GPIOs",
+      "GROM",
       "Gatewaying",
       "Gclk",
       "GitLab",
@@ -303,6 +328,7 @@
       "Grepit",
       "Grundkurs",
       "Gränssnitt",
+      "HFCLKSTAT",
       "HOTP",
       "HW",
       "Haltium",
@@ -318,6 +344,7 @@
       "ISR",
       "ITM",
       "ITMDump",
+      "Ibuild",
       "Idents",
       "Ints",
       "IoT",
@@ -355,6 +382,7 @@
       "MISO",
       "MMIO",
       "MOSI",
+      "MRAM",
       "MSRV",
       "Macrocell",
       "Maskable",
@@ -367,9 +395,11 @@
       "Mthd",
       "Munns",
       "Mutex",
+      "NFCT",
       "NMIENCLR",
       "NMIENSET",
       "NMIFLAG",
+      "NONSECURE",
       "NVIC",
       "NVM",
       "NVMCTRL",
@@ -393,6 +423,7 @@
       "PAGESIZE",
       "PARTNO",
       "PID",
+      "PINSET",
       "PMIC",
       "POOKEY",
       "PRIMASK",
@@ -460,6 +491,7 @@
       "SLOC",
       "SMT",
       "SPI",
+      "SPIM",
       "SRP",
       "STM",
       "STM32",
@@ -523,11 +555,14 @@
       "UARTs",
       "UDEV",
       "UI",
+      "UNENCRY",
       "UNINNIT",
       "URAD",
       "URAT",
       "USART2",
       "USARTs",
+      "USBD",
+      "USBH",
       "USEE",
       "Ultrascale",
       "Undel",
@@ -539,6 +574,7 @@
       "Utvecklarinformation",
       "V3",
       "VBFs",
+      "VBUS",
       "VCC",
       "VECS",
       "VIUs",
@@ -560,10 +596,13 @@
       "WWAN",
       "WWDG",
       "Wahlquist",
+      "Werror",
+      "Wextra",
       "Winsa",
       "XCVU",
       "XORed",
       "XOUT",
+      "XXAA",
       "Xargo",
       "Xeri",
       "Xidfc",
@@ -577,6 +616,7 @@
       "actf",
       "aesmode",
       "afirst",
+      "ahbap",
       "ahbmask",
       "ahbs",
       "aktiveringstid",
@@ -654,6 +694,7 @@
       "checkexamples",
       "checkmacros",
       "checkopt",
+      "cifra",
       "ciplen",
       "cksum",
       "cleanup",
@@ -665,11 +706,14 @@
       "cmdex",
       "cntr",
       "codegen",
+      "comlink",
       "compat",
+      "compiledb",
       "concat",
       "const",
       "consts",
       "contiki",
+      "coremark",
       "cosinussatsen",
       "countsync",
       "croutes",
@@ -765,8 +809,10 @@
       "exekveringsmodeller",
       "extint",
       "extintpin",
+      "falign",
       "fancyhdr",
       "fastboot",
+      "ffunction",
       "fidx",
       "fifo",
       "figurtexter",
@@ -776,6 +822,8 @@
       "flashable",
       "flashbank",
       "flavor",
+      "fmax",
+      "fomit",
       "formatcp",
       "forskningsartiklar",
       "forskningspapper",
@@ -794,6 +842,7 @@
       "getswlm",
       "gfmcmp",
       "gfmul",
+      "ggdb",
       "gpio",
       "gridlayout",
       "gsettings",
@@ -832,6 +881,7 @@
       "intflag",
       "introductional",
       "io",
+      "ipct",
       "iser",
       "itm",
       "jokertecken",
@@ -862,7 +912,9 @@
       "legalpaper",
       "letterpaper",
       "letterspacing",
+      "lfclk",
       "lightgray",
+      "liliumsoc",
       "linkchecker",
       "linkedin",
       "linux",
@@ -879,6 +931,8 @@
       "mars",
       "masq",
       "matchclr",
+      "mcmse",
+      "mcpu",
       "md",
       "mdbook",
       "meddelanderad",
@@ -890,6 +944,7 @@
       "messageram",
       "metaprogramming",
       "metodbeskrivningen",
+      "mfloat",
       "microcontroller",
       "microcontrollers",
       "microkernel",
@@ -904,6 +959,8 @@
       "momentaneous",
       "motorvärmare",
       "mottagaradress",
+      "msoft",
+      "mthumb",
       "mult",
       "multibib",
       "multiremove",
@@ -920,6 +977,7 @@
       "noexecstack",
       "nondeleted",
       "nonempty",
+      "nvmc",
       "nvmp",
       "oathmode",
       "oathtool",
@@ -998,6 +1056,7 @@
       "regexstöd",
       "relän",
       "repo",
+      "repower",
       "repr",
       "resched",
       "resendings",
@@ -1021,6 +1080,7 @@
       "rustfmt",
       "rustup",
       "rxts",
+      "saadc",
       "samd",
       "sblk",
       "schedulability",
@@ -1050,6 +1110,7 @@
       "socmodtest",
       "spawnee",
       "specialtecken",
+      "spiss",
       "spki",
       "spsc",
       "src",
@@ -1150,6 +1211,7 @@
       "v2",
       "videostreaming",
       "virtualenv",
+      "vref",
       "vscode",
       "wakeups",
       "wbuf",
@@ -1173,5 +1235,6 @@
       "yaml",
       "zcvf",
       "ämnesvalet"
-    ]
+    ],
+    "clangd.path": "~/.config/coc/extensions/coc-clangd-data/install/14.0.3/clangd_14.0.3/bin/clangd"
 }

.vimrc

@@ -277,9 +277,6 @@ else
     " Grammatical checking
     Plug 'rhysd/vim-grammarous'
 
-    " Tag generation for ctags
-    "Plug 'ludovicchabant/vim-gutentags'
-
     " Rust-lang support
     Plug 'rust-lang/rust.vim'
 
@@ -947,9 +944,29 @@ nmap <silent> <leader>gt :call CocAction('jumpDefinition', 'tabe')<CR>
 
 nmap <silent> <leader>me <Plug>(coc-command)expandMacro
 
+nmap <silent> <leader>gh :CocCommand clangd.switchSourceHeader<CR>
+nmap <silent> <leader>gH :CocCommand clangd.switchSourceHeader vsplit<CR>
+nmap <silent> <leader>gsi :CocCommand clangd.SymbolInfo<CR>
+
+" From coc-completion-help 2022-08-01
+inoremap <expr> <cr> coc#pum#visible() ? coc#_select_confirm() : "\<CR>"
+
 " Use K to show documentation in preview window
 nnoremap <silent> K :call <SID>show_documentation()<CR>
 
+  function! s:check_back_space() abort
+    let col = col('.') - 1
+    return !col || getline('.')[col - 1]  =~ '\s'
+  endfunction
+
+  " Insert <tab> when previous text is space, refresh completion if not.
+  inoremap <silent><expr> <TAB>
+	\ coc#pum#visible() ? coc#pum#next(1):
+	\ <SID>check_back_space() ? "\<Tab>" :
+	\ coc#refresh()
+  inoremap <expr><S-TAB> coc#pum#visible() ? coc#pum#prev(1) : "\<C-h>"
+
+
 function! s:show_documentation()
     if (index(['vim','help'], &filetype) >= 0)
         execute 'h '.expand('<cword>')
@@ -1042,14 +1059,21 @@ let g:coc_global_extensions = [
             \'coc-markdownlint',
             \'coc-yaml',
             \'coc-toml',
+            \'coc-xml',
             \'coc-pyright',
             \'coc-diagnostic',
             \'coc-spell-checker',
             \'coc-ltex',
             \'coc-cspell-dicts',
             \'coc-clangd',
+            \'coc-snippets',
+            \'coc-git',
             \'coc-vimtex']
 
+" Of interest later:
+            "\'coc-explorer',
+" Conflict with coc-git and coc-explorer https://github.com/weirongxu/coc-explorer/issues/480
+
 " Coc END
 nnoremap <silent> <leader>lt :!languagetool -l en-GB -d DOUBLE_PUNCTUATION,MORFOLOGIK_RULE_EN_GB,ARROWS[1],NON_STANDARD_WORD[1] %<CR>
 
@@ -1143,8 +1167,7 @@ let g:fzf_preview_window = 'right:60%'
 
 let g:fzf_buffers_jump = 1      " [Buffers] to existing split
 
-let $FZF_DEFAULT_COMMAND='rg --vimgrep --no-heading --color=never --smart-case --hidden --files-with-matches -g\!.git -g\!.pijul -g\!.ccls-cache . || git ls-tree -r --name-only HEAD || fd --type f || find .'
-
+let $FZF_DEFAULT_COMMAND='rg --vimgrep --no-heading --color=never --smart-case --hidden --files-with-matches -g\!.git -g\!.pijul -g\!.ccls-cache -g\!\*.svd . || git ls-tree -r --name-only HEAD || fd --type f || find .'
 
 "Get Files
 "command! -bang -nargs=? -complete=dir Files
@@ -1153,12 +1176,12 @@ let $FZF_DEFAULT_COMMAND='rg --vimgrep --no-heading --color=never --smart-case -
 "" Get text in files with Rg
 "command! -bang -nargs=* Rg
 "           \ call fzf#vim#grep(
-            "\   'rg --column --line-number --no-heading --color=always --smart-case '.shellescape(<q-args>), 1,
+"            \   'rg --vimgrep --no-heading --color=always --smart-case --hidden -g\!.git -g\!.pijul -g\!.ccls-cache -g\!\*.svd .'.shellescape(<q-args>), 1,
 "            \   fzf#vim#with_preview(), <bang>0)
 
 " Ripgrep advanced
 function! RipgrepFzf(query, fullscreen)
-    let command_fmt = 'rg --column --line-number --no-heading --color=always --smart-case --hidden -g\!.git -g\!.pijul -g\!.ccls-cache %s || true'
+    let command_fmt = 'rg --column --line-number --no-heading --color=always --smart-case --hidden -g\!.git -g\!.pijul -g\!.ccls-cache -g\!\*.svd %s || true'
     let initial_command = printf(command_fmt, shellescape(a:query))
     let reload_command = printf(command_fmt, '{q}')
     let spec = {'options': ['--phony', '--query', a:query, '--bind', 'change:reload:'.reload_command]}