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feat: add LatchTap keyboard action - #939

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braindefender wants to merge 1 commit into
rmk-rs:mainfrom
braindefender:latchtap
Open

feat: add LatchTap keyboard action#939
braindefender wants to merge 1 commit into
rmk-rs:mainfrom
braindefender:latchtap

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@braindefender

@braindefender braindefender commented Jul 13, 2026

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LatchTap(modifier, key) is a keymap action that latches a modifier for the lifetime of the current layer and taps a key under it on each press.

Unlike LM(layer, modifier), the modifier is not bound to the layer-switch key. It is bound to this dedicated key, so you can place several independent LatchTap keys (with different modifiers/keys) on the same layer.

@braindefender braindefender mentioned this pull request Jul 13, 2026
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github-actions Bot commented Jul 14, 2026

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Size Report

Example main PR Diff .text .data .bss
use_config/nrf52832_ble 394.5 KiB 395.5 KiB +0.24% ⬆️ +980 0 +8
use_config/nrf52840_ble 443.6 KiB 444.2 KiB +0.15% ⬆️ +700 0 +8
use_config/nrf52840_ble_split (central) 493.3 KiB 494.0 KiB +0.15% ⬆️ +792 0 +8
use_config/nrf52840_ble_split (peripheral) 317.3 KiB 317.4 KiB +0.04% ⬆️ +148 0 0
use_config/pi_pico_w_ble 668.0 KiB 668.7 KiB +0.10% ⬆️ +692 0 +8
use_config/rp2040 149.4 KiB 150.1 KiB +0.45% ⬆️ +688 0 +8
use_config/rp2040_split (central) 162.9 KiB 163.7 KiB +0.45% ⬆️ +748 0 +8
use_config/rp2040_split (peripheral) 27.8 KiB 27.8 KiB +0.00% 0 0 0
use_config/stm32f1 63.1 KiB 63.6 KiB +0.75% ⬆️ +480 0 +8
use_config/stm32h7 100.2 KiB 100.8 KiB +0.57% ⬆️ +580 0 +8
use_rust/nrf52832_ble 382.4 KiB 382.5 KiB +0.01% ⬆️ +52 0 +8
use_rust/nrf52840_ble 439.9 KiB 440.1 KiB +0.04% ⬆️ +212 0 +8
use_rust/nrf52840_ble_split (central) 503.4 KiB 503.9 KiB +0.10% ⬆️ +552 0 +8
use_rust/nrf52840_ble_split (peripheral) 313.7 KiB 313.8 KiB +0.04% ⬆️ +156 0 0
use_rust/pi_pico_w_ble 668.2 KiB 668.9 KiB +0.10% ⬆️ +728 0 +8
use_rust/rp2040 148.9 KiB 149.6 KiB +0.47% ⬆️ +716 0 +8
use_rust/rp2040_split (central) 161.6 KiB 162.4 KiB +0.46% ⬆️ +764 0 +8
use_rust/rp2040_split (peripheral) 28.2 KiB 28.2 KiB +0.00% 0 0 0
use_rust/stm32f1 62.7 KiB 63.1 KiB +0.74% ⬆️ +472 0 +8
use_rust/stm32h7 122.5 KiB 122.9 KiB +0.32% ⬆️ +400 0 +8
use_config/nrf52832_ble — 394.5 KiB → 395.5 KiB (+0.24% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 365496	   4588	  34864	 404948	  62dd4	rmk-nrf52832

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 364516	   4588	  34856	 403960	  629f8	rmk-nrf52832

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1% +1.85Ki  [ = ]       0    .debug_str
  +0.3%    +916  +0.3%    +916    .text
  +0.3%    +664  [ = ]       0    .debug_ranges
  +0.2%    +576  [ = ]       0    .strtab
  +0.2%    +224  [ = ]       0    .symtab
  +0.0%    +156  [ = ]       0    .debug_line
  +0.3%    +144  [ = ]       0    .debug_frame
  +0.0%    +132  [ = ]       0    .debug_info
  +0.2%     +64  +0.2%     +64    .rodata
  +0.1%     +56  [ = ]       0    .debug_aranges
  [ = ]       0  +0.0%      +8    .bss
 -33.3%     -20  [ = ]       0    [Unmapped]
  -1.1%     -86  [ = ]       0    .debug_abbrev
  -0.1%    -353  [ = ]       0    .debug_loc
  +0.1% +4.27Ki  +0.2%    +988    TOTAL
use_config/nrf52840_ble — 443.6 KiB → 444.2 KiB (+0.15% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 398812	   4596	  51504	 454912	  6f100	rmk-nrf52840

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 398112	   4596	  51496	 454204	  6ee3c	rmk-nrf52840

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.3% +2.29Ki  [ = ]       0    .debug_loc
  +0.0% +1.42Ki  [ = ]       0    .debug_str
  +0.5% +1.09Ki  [ = ]       0    .debug_ranges
  +0.2%    +640  +0.2%    +640    .text
  +0.1%    +419  [ = ]       0    .strtab
  +0.1%    +317  [ = ]       0    .debug_line
  +0.0%    +199  [ = ]       0    .debug_info
  +0.0%     +64  [ = ]       0    .symtab
  +0.1%     +60  +0.1%     +60    .rodata
  +0.5%     +39  [ = ]       0    .debug_abbrev
  +0.0%     +16  [ = ]       0    .debug_frame
  [ = ]       0  +0.0%      +8    .bss
  +6.9%      +4  [ = ]       0    [Unmapped]
  -0.0%      -8  [ = ]       0    .debug_aranges
  +0.1% +6.50Ki  +0.2%    +708    TOTAL
use_config/nrf52840_ble_split (central) — 493.3 KiB → 494.0 KiB (+0.15% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 454344	   4652	  46904	 505900	  7b82c	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 453552	   4652	  46896	 505100	  7b50c	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0% +1.68Ki  [ = ]       0    .debug_str
  +0.2%    +728  +0.2%    +728    .text
  +0.3%    +720  [ = ]       0    .debug_ranges
  +0.0%    +624  [ = ]       0    .debug_info
  +0.2%    +619  [ = ]       0    .strtab
  +0.1%    +286  [ = ]       0    .debug_line
  +0.2%    +256  [ = ]       0    .symtab
  +0.3%    +160  [ = ]       0    .debug_frame
  +0.1%     +64  [ = ]       0    .debug_aranges
  +0.1%     +64  +0.1%     +64    .rodata
  [ = ]       0  +0.0%      +8    .bss
  +0.9%      +8  [ = ]       0    .defmt
  +3.5%      +2  [ = ]       0    [Unmapped]
  -0.0%     -39  [ = ]       0    .debug_loc
  +0.1% +5.09Ki  +0.2%    +800    TOTAL
use_config/nrf52840_ble_split (peripheral) — 317.3 KiB → 317.4 KiB (+0.04% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 293440	   4468	  27152	 325060	  4f5c4	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 293292	   4468	  27152	 324912	  4f530	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0% +1.10Ki  [ = ]       0    .debug_str
  +0.1% +1.02Ki  [ = ]       0    .debug_info
  +0.1%    +572  [ = ]       0    .debug_loc
  +0.1%    +331  [ = ]       0    .strtab
  +0.1%    +148  +0.1%    +148    .text
  +0.1%    +147  [ = ]       0    .debug_line
  +0.1%    +136  [ = ]       0    .debug_ranges
  +0.1%    +128  [ = ]       0    .symtab
  +0.2%     +76  [ = ]       0    .debug_frame
  +0.1%     +32  [ = ]       0    .debug_aranges
   +26%     +12  [ = ]       0    [Unmapped]
  +0.1% +3.67Ki  +0.0%    +148    TOTAL
use_config/pi_pico_w_ble — 668.0 KiB → 668.7 KiB (+0.10% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 630000	      0	  54708	 684708	  a72a4	rmk-pi-pico-w

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 629308	      0	  54700	 684008	  a6fe8	rmk-pi-pico-w

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +6.49Ki  [ = ]       0    .debug_str
  +0.1% +2.73Ki  [ = ]       0    .debug_info
  +0.1% +1.40Ki  [ = ]       0    .debug_loc
  +0.3% +1.10Ki  [ = ]       0    .strtab
  +0.2%    +763  [ = ]       0    .debug_line
  +0.2%    +628  +0.2%    +628    .text
  +0.2%    +608  [ = ]       0    .debug_ranges
  +0.0%     +64  +0.0%     +64    .rodata
  +0.1%     +60  [ = ]       0    .debug_frame
  +0.1%     +48  [ = ]       0    .symtab
  +0.0%     +16  [ = ]       0    .debug_aranges
   +29%     +15  [ = ]       0    [Unmapped]
  [ = ]       0  +0.0%      +8    .bss
  +0.1% +13.9Ki  +0.1%    +700    TOTAL
use_config/rp2040 — 149.4 KiB → 150.1 KiB (+0.45% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 138044	      0	  15636	 153680	  25850	rmk-rp2040

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 137356	      0	  15628	 152984	  25598	rmk-rp2040

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.3% +2.78Ki  [ = ]       0    .debug_info
  +0.1% +1.80Ki  [ = ]       0    .debug_str
  +0.4%    +750  [ = ]       0    .debug_line
  +0.5%    +624  +0.5%    +624    .text
  +0.2%    +532  [ = ]       0    .debug_loc
  +0.4%    +461  [ = ]       0    .strtab
  +0.5%    +456  [ = ]       0    .debug_ranges
  +0.4%     +64  +0.4%     +64    .rodata
  +0.3%     +60  [ = ]       0    .debug_frame
   +68%     +23  [ = ]       0    [Unmapped]
  +0.1%     +16  [ = ]       0    .debug_aranges
  +0.0%     +16  [ = ]       0    .symtab
  [ = ]       0  +0.1%      +8    .bss
  +0.2% +7.52Ki  +0.5%    +696    TOTAL
use_config/rp2040_split (central) — 162.9 KiB → 163.7 KiB (+0.45% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 151096	      0	  16484	 167580	  28e9c	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 150348	      0	  16476	 166824	  28ba8	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +2.78Ki  [ = ]       0    .debug_info
  +0.1% +1.81Ki  [ = ]       0    .debug_str
  +0.4%    +707  [ = ]       0    .debug_line
  +0.5%    +684  +0.5%    +684    .text
  +0.2%    +551  [ = ]       0    .debug_loc
  +0.5%    +456  [ = ]       0    .debug_ranges
  +0.3%    +455  [ = ]       0    .strtab
  +0.3%     +64  +0.3%     +64    .rodata
  +0.3%     +60  [ = ]       0    .debug_frame
   +45%     +17  [ = ]       0    [Unmapped]
  +0.1%     +16  [ = ]       0    .debug_aranges
  +0.0%     +16  [ = ]       0    .symtab
  [ = ]       0  +0.1%      +8    .bss
  +0.2% +7.54Ki  +0.5%    +756    TOTAL
use_config/rp2040_split (peripheral) — 27.8 KiB → 27.8 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  25612	     60	   2796	  28468	   6f34	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  25612	     60	   2796	  28468	   6f34	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +47  [ = ]       0    .debug_info
  +0.0%     +34  [ = ]       0    .debug_str
  -0.0%      -2  [ = ]       0    .strtab
  -7.0%      -3  [ = ]       0    [Unmapped]
  +0.0%     +76  [ = ]       0    TOTAL
use_config/stm32f1 — 63.1 KiB → 63.6 KiB (+0.75% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  57528	     28	   7596	  65152	   fe80	rmk-stm32f1

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  57048	     28	   7588	  64664	   fc98	rmk-stm32f1

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.3% +1.45Ki  [ = ]       0    .debug_info
  +0.6%    +711  [ = ]       0    .debug_loc
  +0.1%    +618  [ = ]       0    .debug_str
  +1.2%    +496  [ = ]       0    .debug_ranges
  +0.9%    +480  +0.9%    +480    .text
  +0.4%    +336  [ = ]       0    .debug_line
  +0.0%     +22  [ = ]       0    .strtab
  [ = ]       0  +0.1%      +8    .bss
  +7.0%      +4  [ = ]       0    [Unmapped]
  -0.1%      -8  [ = ]       0    .debug_aranges
  -0.2%     -32  [ = ]       0    .symtab
  +0.2% +4.02Ki  +0.8%    +488    TOTAL
use_config/stm32h7 — 100.2 KiB → 100.8 KiB (+0.57% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  93100	    264	   9824	 103188	  19314	rmk-stm32h7

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  92520	    264	   9816	 102600	  190c8	rmk-stm32h7

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +1.55Ki  [ = ]       0    .debug_info
  +0.4%    +732  [ = ]       0    .debug_loc
  +0.6%    +500  +0.6%    +500    .text
  +0.6%    +384  [ = ]       0    .debug_ranges
  +0.3%    +356  [ = ]       0    .debug_line
  +0.6%     +80  +0.6%     +80    .rodata
  [ = ]       0  +0.1%      +8    .bss
  -6.2%      -4  [ = ]       0    [Unmapped]
  -0.0%      -8  [ = ]       0    .debug_aranges
  -0.1%     -16  [ = ]       0    .symtab
  -0.1%     -92  [ = ]       0    .strtab
  -0.0%    -713  [ = ]       0    .debug_str
  +0.1% +2.74Ki  +0.6%    +588    TOTAL
use_rust/nrf52832_ble — 382.4 KiB → 382.5 KiB (+0.01% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 353228	   4588	  33848	 391664	  5f9f0	rmk-nrf52832

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 353176	   4588	  33840	 391604	  5f9b4	rmk-nrf52832

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +3.08Ki  [ = ]       0    .debug_info
  +0.0% +1.46Ki  [ = ]       0    .debug_str
  +0.3%    +733  [ = ]       0    .strtab
  +0.2%    +702  [ = ]       0    .debug_line
  +0.2%     +64  +0.2%     +64    .rodata
   +35%     +15  [ = ]       0    [Unmapped]
  [ = ]       0  +0.0%      +8    .bss
  +1.7%      +8  [ = ]       0    .defmt
  -0.0%     -12  -0.0%     -12    .text
  -0.2%     -16  [ = ]       0    .debug_abbrev
  -0.3%    -112  [ = ]       0    .debug_aranges
  -0.4%    -168  [ = ]       0    .debug_frame
  -0.3%    -400  [ = ]       0    .symtab
  -0.5%   -1016  [ = ]       0    .debug_ranges
  -0.6% -3.90Ki  [ = ]       0    .debug_loc
  +0.0%    +444  +0.0%     +60    TOTAL
use_rust/nrf52840_ble — 439.9 KiB → 440.1 KiB (+0.04% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 399068	   4588	  46984	 450640	  6e050	rmk-nrf52840

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 398856	   4588	  46976	 450420	  6df74	rmk-nrf52840

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.4% +3.21Ki  [ = ]       0    .debug_loc
  +0.1% +2.64Ki  [ = ]       0    .debug_info
  +0.2%    +520  [ = ]       0    .debug_ranges
  +0.1%    +194  [ = ]       0    .debug_line
  +0.0%    +148  +0.0%    +148    .text
  +0.1%     +96  [ = ]       0    .symtab
  +0.2%     +64  +0.2%     +64    .rodata
  +0.1%     +60  [ = ]       0    .debug_frame
  +0.0%     +24  [ = ]       0    .strtab
  +0.0%     +16  [ = ]       0    .debug_aranges
   +15%      +9  [ = ]       0    [Unmapped]
  [ = ]       0  +0.0%      +8    .bss
  -0.1% -2.66Ki  [ = ]       0    .debug_str
  +0.1% +4.29Ki  +0.0%    +220    TOTAL
use_rust/nrf52840_ble_split (central) — 503.4 KiB → 503.9 KiB (+0.10% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 458700	   4652	  52648	 516000	  7dfa0	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 458148	   4652	  52640	 515440	  7dd70	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1% +3.47Ki  [ = ]       0    .debug_info
  +0.0% +2.08Ki  [ = ]       0    .debug_str
  +0.2% +1.50Ki  [ = ]       0    .debug_loc
  +0.2%    +647  [ = ]       0    .strtab
  +0.1%    +549  [ = ]       0    .debug_line
  +0.1%    +488  +0.1%    +488    .text
  +0.2%    +320  [ = ]       0    .symtab
  +0.1%    +256  [ = ]       0    .debug_ranges
  +0.3%    +172  [ = ]       0    .debug_frame
  +0.1%     +72  [ = ]       0    .debug_aranges
  +0.1%     +64  +0.1%     +64    .rodata
  [ = ]       0  +0.0%      +8    .bss
 -16.7%     -11  [ = ]       0    [Unmapped]
  +0.1% +9.54Ki  +0.1%    +560    TOTAL
use_rust/nrf52840_ble_split (peripheral) — 313.7 KiB → 313.8 KiB (+0.04% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 291512	   4468	  25400	 321380	  4e764	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 291356	   4468	  25400	 321224	  4e6c8	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0% +1.07Ki  [ = ]       0    .debug_str
  +0.1% +1.03Ki  [ = ]       0    .debug_info
  +0.1%    +574  [ = ]       0    .debug_loc
  +0.1%    +314  [ = ]       0    .strtab
  +0.1%    +156  +0.1%    +156    .text
  +0.1%    +146  [ = ]       0    .debug_line
  +0.1%    +136  [ = ]       0    .debug_ranges
  +0.1%    +128  [ = ]       0    .symtab
  +0.2%     +76  [ = ]       0    .debug_frame
  +0.1%     +32  [ = ]       0    .debug_aranges
  +3.1%      +2  [ = ]       0    [Unmapped]
  +0.1% +3.62Ki  +0.0%    +156    TOTAL
use_rust/pi_pico_w_ble — 668.2 KiB → 668.9 KiB (+0.10% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 630128	      0	  54852	 684980	  a73b4	rmk-pi-pico-w

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 629400	      0	  54844	 684244	  a70d4	rmk-pi-pico-w

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1% +2.75Ki  [ = ]       0    .debug_info
  +0.2% +1.94Ki  [ = ]       0    .debug_loc
  +0.0% +1.54Ki  [ = ]       0    .debug_str
  +0.2%    +691  [ = ]       0    .debug_line
  +0.2%    +664  +0.2%    +664    .text
  +0.2%    +584  [ = ]       0    .debug_ranges
  +0.1%    +453  [ = ]       0    .strtab
  +0.0%     +64  +0.0%     +64    .rodata
  +0.1%     +60  [ = ]       0    .debug_frame
  +0.1%     +48  [ = ]       0    .symtab
  +0.0%     +16  [ = ]       0    .debug_aranges
  [ = ]       0  +0.0%      +8    .bss
   +14%      +8  [ = ]       0    [Unmapped]
  +0.1% +8.76Ki  +0.1%    +736    TOTAL
use_rust/rp2040 — 148.9 KiB → 149.6 KiB (+0.47% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 137644	      0	  15508	 153152	  25640	rmk-rp2040

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 136928	      0	  15500	 152428	  2536c	rmk-rp2040

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.3% +2.74Ki  [ = ]       0    .debug_info
  +0.1% +1.80Ki  [ = ]       0    .debug_str
  +0.4% +1.20Ki  [ = ]       0    .debug_loc
  +0.4%    +747  [ = ]       0    .debug_line
  +0.5%    +652  +0.5%    +652    .text
  +0.4%    +473  [ = ]       0    .strtab
  +0.6%    +456  [ = ]       0    .debug_ranges
  +0.2%     +80  [ = ]       0    .symtab
  +0.4%     +64  +0.4%     +64    .rodata
  +0.3%     +60  [ = ]       0    .debug_frame
  +0.1%     +16  [ = ]       0    .debug_aranges
  [ = ]       0  +0.1%      +8    .bss
 -24.5%     -12  [ = ]       0    [Unmapped]
  +0.2% +8.23Ki  +0.5%    +724    TOTAL
use_rust/rp2040_split (central) — 161.6 KiB → 162.4 KiB (+0.46% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 149980	      0	  16268	 166248	  28968	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 149216	      0	  16260	 165476	  28664	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +4.22Ki  [ = ]       0    .debug_str
  +0.3% +2.81Ki  [ = ]       0    .debug_info
  +0.2%    +730  [ = ]       0    .debug_loc
  +0.4%    +724  [ = ]       0    .debug_line
  +0.5%    +716  [ = ]       0    .strtab
  +0.5%    +700  +0.5%    +700    .text
  +0.5%    +480  [ = ]       0    .debug_ranges
  +0.3%     +64  +0.3%     +64    .rodata
  +0.3%     +60  [ = ]       0    .debug_frame
  +0.1%     +16  [ = ]       0    .debug_aranges
  +0.0%     +16  [ = ]       0    .symtab
  [ = ]       0  +0.1%      +8    .bss
  +3.9%      +2  [ = ]       0    [Unmapped]
  +0.3% +10.5Ki  +0.5%    +772    TOTAL
use_rust/rp2040_split (peripheral) — 28.2 KiB → 28.2 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  25712	     60	   3060	  28832	   70a0	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  25712	     60	   3060	  28832	   70a0	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1%    +617  [ = ]       0    .debug_str
  +0.0%     +47  [ = ]       0    .debug_info
  +0.1%     +26  [ = ]       0    .strtab
  +5.4%      +2  [ = ]       0    [Unmapped]
  +0.0%    +692  [ = ]       0    TOTAL
use_rust/stm32f1 — 62.7 KiB → 63.1 KiB (+0.74% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  57052	     28	   7564	  64644	   fc84	rmk-stm32f1

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  56580	     28	   7556	  64164	   faa4	rmk-stm32f1

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.3% +1.41Ki  [ = ]       0    .debug_info
  +0.5%    +659  [ = ]       0    .debug_loc
  +0.1%    +596  [ = ]       0    .debug_str
  +1.2%    +496  [ = ]       0    .debug_ranges
  +0.8%    +472  +0.8%    +472    .text
  +0.4%    +349  [ = ]       0    .debug_line
  [ = ]       0  +0.1%      +8    .bss
   +16%      +8  [ = ]       0    [Unmapped]
  -0.0%      -9  [ = ]       0    .strtab
  -0.3%     -16  [ = ]       0    .debug_aranges
  -0.1%     -16  [ = ]       0    .debug_frame
  -0.5%     -96  [ = ]       0    .symtab
  +0.2% +3.80Ki  +0.7%    +480    TOTAL
use_rust/stm32h7 — 122.5 KiB → 122.9 KiB (+0.32% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 109760	    320	  15788	 125868	  1ebac	rmk-stm32h7

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 109360	    320	  15780	 125460	  1ea14	rmk-stm32h7

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +2.38Ki  [ = ]       0    .debug_info
  +0.6% +1.38Ki  [ = ]       0    .debug_loc
  +0.1% +1.24Ki  [ = ]       0    .debug_str
  +0.8%    +640  [ = ]       0    .debug_ranges
  +0.4%    +400  +0.4%    +400    .text
  +0.2%    +296  [ = ]       0    .debug_line
  +0.3%    +264  [ = ]       0    .strtab
  [ = ]       0  +0.1%      +8    .bss
 -26.6%     -17  [ = ]       0    [Unmapped]
  -0.1%     -48  [ = ]       0    .debug_aranges
  -0.3%     -68  [ = ]       0    .debug_frame
  -0.6%    -224  [ = ]       0    .symtab
  +0.1% +6.22Ki  +0.3%    +408    TOTAL

@HaoboGu

HaoboGu commented Jul 14, 2026 •
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This behavior is quite similar with what #859 does, but narrower. What do you think the way proposed by #859?

@braindefender

braindefender commented Jul 14, 2026

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This behavior is quite similar with what #859 does, but narrower. What do you think the way proposed by #859?

Yeah, I will take a closer look at #859. Maybe it will cover all the cases.

I see potential problem in combining OSM/SK into one behavior:

  • The behavior is configured once, but some users may want to combine different settings for different keys. How will this be handled?
  • For example, in my LatchTap implementation, the layer change is releasing the latched mod (similar to release_on_layer_change behavior setting). But what if I want that behavior only in LatchTap keys and not in OSM?

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@braindefender @HaoboGu