2021 May 29 Breaking Changes Update (#13034)

* Add Per Key functionality for AutoShift (#11536)

* LED Matrix: Reactive effect buffers & advanced indicators (#12588)

* [Keyboard] kint36: switch to sym_eager_pk debouncing (#12626)

* [Keyboard] kint2pp: reduce input latency by ≈10ms (#12625)

* LED Matrix: Split (#12633)

* [CI] Format code according to conventions (#12650)

* feat: infinite timeout for leader key (#6580)

* feat: implement leader_no_timeout logic

* docs(leader_key): infinite leader timeout docs

* Format code according to conventions (#12680)

* Update ADC driver for STM32F1xx, STM32F3xx, STM32F4xx (#12403)

* Fix default ADC_RESOLUTION for ADCv3 (and ADCv4)

Recent ChibiOS update removed ADC_CFGR1_RES_10BIT from the ADCv3 headers
(that macro should not have been there, because ADCv3 has CFGR instead of
CFGR1).  Fix the default value for ADC_RESOLUTION to use ADC_CFGR_RES_10BITS
if it is defined (that name is used for ADCv3 and ADCv4).

* Update ADC docs to match the actually used resolution

ADC driver for ChibiOS actually uses the 10-bit resolution by default
(probably to match AVR); fix the documentation accordingly.  Also add
both ADC_CFGR_RES_10BITS and ADC_CFGR1_RES_10BIT constants (these names
differ according to the ADC implementation in the particular MCU).

* Fix pinToMux() for B12 and B13 on STM32F3xx

Testing on STM32F303CCT6 revealed that the ADC mux values for B12 and
B13 pins were wrong.

* Add support for all possible analog pins on STM32F1xx

Added ADC mux values for pins A0...A7, B0, B1, C0...C5 on STM32F1xx
(they are the same at least for STM32F103x8 and larger F103 devices, and
also F102, F105, F107 families).  Actually tested on STM32F103C8T6
(therefore pins C0...C5 were not tested).

Pins F6...F10, which are present on STM32F103x[C-G] in 144-pin packages,
cannot be supported at the moment, because those pins are connected only
to ADC3, but the ChibiOS ADC driver for STM32F1xx supports only ADC1.

* Add support for all possible analog pins on STM32F4xx

Added ADC mux values for pins A0...A7, B0, B1, C0...C5 and optionally
F3...F10 (if STM32_ADC_USE_ADC3 is enabled).  These mux values are
apparently the same for all F4xx devices, except some smaller devices may
not have ADC3.

Actually tested on STM32F401CCU6, STM32F401CEU6, STM32F411CEU6 (using
various WeAct “Blackpill” boards); only pins A0...A7, B0, B1 were tested.

Pins F3...F10 are inside `#if STM32_ADC_USE_ADC3` because some devices
which don't have ADC3 also don't have the GPIOF port, therefore the code
which refers to Fx pins does not compile.

* Fix STM32F3xx ADC mux table in documentation

The ADC driver documentation had some errors in the mux table for STM32F3xx.
Fix this table to match the datasheet and the actual code (mux settings for
B12 and B13 were also tested on a real STM32F303CCT6 chip).

* Add STM32F1xx ADC pins to the documentation

* Add STM32F4xx ADC pins to the documentation

* Add initial support for tinyuf2 bootloader (when hosted on F411 blackpill) (#12600)

* Add support for jumping to tinyuf2 bootloader. Adds blackpill UF2 example.

* Update flashing.md

* Update chconf.h

* Update config.h

* Update halconf.h

* Update mcuconf.h

* eeprom driver: Refactor where eeprom driver initialisation (and EEPROM emulation initialisation) occurs to make it non-target-specific. (#12671)

* Add support for MCU = STM32F446 (#12619)

* Add support for MCU = STM32F446

* Update platforms/chibios/GENERIC_STM32_F446XE/configs/config.h

* Restore mcuconf.h to the one used by RT-STM32F446RE-NUCLEO64

* stm32f446: update mcuconf.h and board.h for 16MHz operation, with USB enabled, and other peripherals disabled.

* Format code according to conventions (#12682)

* Format code according to conventions (#12687)

* Add STM32L433 and L443 support (#12063)

* initial L433 commit

* change to XC

* fix L433

* disable all peripherals

* update system and peripheral clocks

* 433 change

* use its own board  files

* revert its own board files

* l433 specific change

* fix stm32l432xx define

* remove duplicate #define

* fix bootloader jump

* move to L443xx and add i2c2, spi2, usart3 to mcuconf.h

* move to L443

* move to L443

* fix sdmmc in mcuconf.h

* include STM32L443

* add L443

* Include L443 in compatible microcontrollers

* Include L443 in compatible microcontrollers

* Update config bootloader jump description

* Update ChibiOS define reasoning

* Update quantum/mcu_selection.mk

* fix git conflict

* Updated Function96 with V2 files and removed chconf.h and halconf.h (#12613)

* Fix bad PR merge for #6580. (#12721)

* Change RGB/LED Matrix to use a simple define for USB suspend (#12697)

* [CI] Format code according to conventions (#12731)

* Fixing transport's led/rgb matrix suspend state logic (#12770)

* [CI] Format code according to conventions (#12772)

* Fix comment parsing (#12750)

* Added OLED fade out support (#12086)

* fix some references to bin/qmk that slipped in (#12832)

* Resolve a number of warnings in `qmk generate-api` (#12833)

* New command: qmk console (#12828)

* stash poc

* stash

* tidy up implementation

* Tidy up slightly for review

* Tidy up slightly for review

* Bodge environment to make tests pass

* Refactor away from asyncio due to windows issues

* Filter devices

* align vid/pid printing

* Add hidapi to the installers

* start preparing for multiple hid_listeners

* udev rules for hid_listen

* refactor to move closer to end state

* very basic implementation of the threaded model

* refactor how vid/pid/index are supplied and parsed

* windows improvements

* read the report directly when usage page isn't available

* add per-device colors, the choice to show names or numbers, and refactor

* add timestamps

* Add support for showing bootloaders

* tweak the color for bootloaders

* Align bootloader disconnect with connect color

* add support for showing all bootloaders

* fix the pyusb check

* tweaks

* fix exception

* hide a stack trace behind -v

* add --no-bootloaders option

* add documentation for qmk console

* Apply suggestions from code review

* pyformat

* clean up and flesh out KNOWN_BOOTLOADERS

* Remove pointless SERIAL_LINK_ENABLE rules (#12846)

* Make Swap Hands use PROGMEM (#12284)

This converts the array that the Swap Hands feature uses to use PROGMEM,
and to read from that array, as such. Since this array never changes at
runtime, there is no reason to keep it in memory. Especially for AVR
boards, as memory is a precious resource.

* Fix another bin/qmk reference (#12856)

* [Keymap] Turn OLED off on suspend in soundmonster keymap (#10419)

* Fixup build errors on `develop` branch. (#12723)

* LED Matrix: Effects! (#12651)

* Fix syntax error when compiling for ARM (#12866)

* Remove KEYMAP and LAYOUT_kc (#12160)

* alias KEYMAP to LAYOUT

* remove KEYMAP and LAYOUT_kc

* Add setup, clone, and env to the list of commands we allow even with broken modules (#12868)

* Rename `point_t` -> `led_point_t` (#12864)

* [Keyboard] updated a vendor name / fixed minor keymap issues (#12881)

* Add missing LED Matrix suspend code to suspend.c (#12878)

* LED Matrix: Documentation (#12685)

* Deprecate `send_unicode_hex_string()` (#12602)

* Fix spelling mistake regarding LED Matrix in split_common. (#12888)

* [Keymap] Fix QWERTY/DVORAK status output for kzar keymap (#12895)

* Use milc.subcommand.config instead of qmk.cli.config (#12915)

* Use milc.subcommand.config instead

* pyformat

* remove the config test

* Add function to allow repeated blinking of one layer (#12237)

* Implement function rgblight_blink_layer_repeat to allow repeated blinking of one layer at a time

* Update doc

* Rework rgblight blinking according to requested change

* optimize storage

* Fixup housekeeping from being invoked twice per loop. (#12933)

* matrix: wait for row signal to go HIGH for every row (#12945)

I noticed this discrepancy (last row of the matrix treated differently than the
others) when optimizing the input latency of my keyboard controller, see also
https://michael.stapelberg.ch/posts/2021-05-08-keyboard-input-latency-qmk-kinesis/

Before this commit, when tuning the delays I noticed ghost key presses when
pressing the F2 key, which is on the last row of the keyboard matrix: the
dead_grave key, which is on the first row of the keyboard matrix, would be
incorrectly detected as pressed.

After this commit, all keyboard matrix rows are interpreted correctly.

I suspect that my setup is more susceptible to this nuance than others because I
use GPIO_INPUT_PIN_DELAY=0 and hence don’t have another delay that might mask
the problem.

* ensure we do not conflict with existing keymap aliases (#12976)

* Add support for up to 4 IS31FL3733 drivers (#12342)

* Convert Encoder callbacks to be boolean functions (#12805)

* [Keyboard] Fix Terrazzo build failure (#12977)

* Do not hard set config in CPTC files (#11864)

* [Keyboard] Corne - Remove legacy revision support (#12226)

* [Keymap] Update to Drashna keymap and user code (based on develop) (#12936)

* Add Full-duplex serial driver for ARM boards (#9842)

* Document LED_MATRIX_FRAMEBUFFER_EFFECTS (#12987)

* Backlight: add defines for default level and breathing state (#12560)

* Add dire message about LUFA mass storage bootloader (#13014)

* [Keyboard] Remove redundant legacy and common headers for crkbd (#13023)

Was causing compiler errors on some systems.

* Fix keyboards/keymaps for boolean encoder callback changes (#12985)

* `backlight.c`: include `eeprom.h` (#13024)

* Add changelog for 2021-05-29 Breaking Changes merge (#12939)

* Add ChangeLog for 2021-05-29 Breaking Changes Merge: initial version

* Add recent develop changes

* Sort recent develop changes

* Remove sections for ChibiOS changes per tzarc

No ChibiOS changes this round.

* Add and sort recent develop changes

* add notes about keyboard moves/deletions

* import changelog for PR 12172

Documents the change to BOOTMAGIC_ENABLE.

* update section headings

* re-sort changelog

* add additional note regarding Bootmagic changes

* remove changelog timestamp

* update dates in main Breaking Changes docs

* fix broken section anchors in previous changelogs

* add link to backlight/eeprom patch to changelog

* highlight some more changes

* link PRs from section headers

* Restore standard readme

* run: qmk cformat --core-only

7 files changed, 313 insertions, 59 deletions

diff --git a/tmk_core/common/chibios/_wait.h b/tmk_core/common/chibios/_wait.h
new file mode 100644
index 0000000000..5bface53e1
--- /dev/null
+++ b/tmk_core/common/chibios/_wait.h
@@ -0,0 +1,55 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include <ch.h>
+
+/* chThdSleepX of zero maps to infinite - so we map to a tiny delay to still yield */
+#define wait_ms(ms)                     \
+    do {                                \
+        if (ms != 0) {                  \
+            chThdSleepMilliseconds(ms); \
+        } else {                        \
+            chThdSleepMicroseconds(1);  \
+        }                               \
+    } while (0)
+#define wait_us(us)                     \
+    do {                                \
+        if (us != 0) {                  \
+            chThdSleepMicroseconds(us); \
+        } else {                        \
+            chThdSleepMicroseconds(1);  \
+        }                               \
+    } while (0)
+
+/* For GPIOs on ARM-based MCUs, the input pins are sampled by the clock of the bus
+ * to which the GPIO is connected.
+ * The connected buses differ depending on the various series of MCUs.
+ * And since the instruction execution clock of the CPU and the bus clock of GPIO are different,
+ * there is a delay of several clocks to read the change of the input signal.
+ *
+ * Define this delay with the GPIO_INPUT_PIN_DELAY macro.
+ * If the GPIO_INPUT_PIN_DELAY macro is not defined, the following default values will be used.
+ * (A fairly large value of 0.25 microseconds is set.)
+ */
+
+#include "wait.c"
+
+#ifndef GPIO_INPUT_PIN_DELAY
+#    define GPIO_INPUT_PIN_DELAY (STM32_SYSCLK / 1000000L / 4)
+#endif
+
+#define waitInputPinDelay() wait_cpuclock(GPIO_INPUT_PIN_DELAY)
diff --git a/tmk_core/common/chibios/bootloader.c b/tmk_core/common/chibios/bootloader.c
index 6cabcc4b81..11f7abf432 100644
--- a/tmk_core/common/chibios/bootloader.c
+++ b/tmk_core/common/chibios/bootloader.c
@@ -13,7 +13,23 @@
 #    define STM32_BOOTLOADER_DUAL_BANK FALSE
 #endif
 
-#if STM32_BOOTLOADER_DUAL_BANK
+#ifdef BOOTLOADER_TINYUF2
+
+#    define DBL_TAP_MAGIC 0xf01669ef  // From tinyuf2's board_api.h
+
+// defined by linker script
+extern uint32_t _board_dfu_dbl_tap[];
+#    define DBL_TAP_REG _board_dfu_dbl_tap[0]
+
+void bootloader_jump(void) {
+    DBL_TAP_REG = DBL_TAP_MAGIC;
+    NVIC_SystemReset();
+}
+
+void enter_bootloader_mode_if_requested(void) { /* not needed, no two-stage reset */
+}
+
+#elif STM32_BOOTLOADER_DUAL_BANK
 
 // Need pin definitions
 #    include "config_common.h"
@@ -79,7 +95,7 @@ void enter_bootloader_mode_if_requested(void) {
     }
 }
 
-#elif defined(KL2x) || defined(K20x)  // STM32_BOOTLOADER_DUAL_BANK // STM32_BOOTLOADER_ADDRESS
+#elif defined(KL2x) || defined(K20x) || defined(MK66F18)  // STM32_BOOTLOADER_DUAL_BANK // STM32_BOOTLOADER_ADDRESS
 /* Kinetis */
 
 #    if defined(BOOTLOADER_KIIBOHD)
diff --git a/tmk_core/common/chibios/chibios_config.h b/tmk_core/common/chibios/chibios_config.h
index b4d96465d1..1d8ace4955 100644
--- a/tmk_core/common/chibios/chibios_config.h
+++ b/tmk_core/common/chibios/chibios_config.h
@@ -15,6 +15,8 @@
  */
 #pragma once
 
+#define SPLIT_USB_DETECT  // Force this on for now
+
 #if defined(STM32F1XX)
 #    define USE_GPIOV1
 #endif
@@ -28,4 +30,9 @@
 #    define USE_I2CV1
 #    define USE_I2CV1_CONTRIB  // for some reason a bunch of ChibiOS-Contrib boards only have clock_speed
 #    define USE_GPIOV1
+#    define STM32_SYSCLK KINETIS_SYSCLK_FREQUENCY
+#endif
+
+#if defined(MK66F18)
+#    define STM32_SYSCLK KINETIS_SYSCLK_FREQUENCY
 #endif
diff --git a/tmk_core/common/chibios/pin_defs.h b/tmk_core/common/chibios/pin_defs.h
index 86bc1076e8..c03f8de0c2 100644
--- a/tmk_core/common/chibios/pin_defs.h
+++ b/tmk_core/common/chibios/pin_defs.h
@@ -70,6 +70,23 @@
 #    define A13 PAL_LINE(GPIOA, 13)
 #    define A14 PAL_LINE(GPIOA, 14)
 #    define A15 PAL_LINE(GPIOA, 15)
+#    define A16 PAL_LINE(GPIOA, 16)
+#    define A17 PAL_LINE(GPIOA, 17)
+#    define A18 PAL_LINE(GPIOA, 18)
+#    define A19 PAL_LINE(GPIOA, 19)
+#    define A20 PAL_LINE(GPIOA, 20)
+#    define A21 PAL_LINE(GPIOA, 21)
+#    define A22 PAL_LINE(GPIOA, 22)
+#    define A23 PAL_LINE(GPIOA, 23)
+#    define A24 PAL_LINE(GPIOA, 24)
+#    define A25 PAL_LINE(GPIOA, 25)
+#    define A26 PAL_LINE(GPIOA, 26)
+#    define A27 PAL_LINE(GPIOA, 27)
+#    define A28 PAL_LINE(GPIOA, 28)
+#    define A29 PAL_LINE(GPIOA, 29)
+#    define A30 PAL_LINE(GPIOA, 30)
+#    define A31 PAL_LINE(GPIOA, 31)
+#    define A32 PAL_LINE(GPIOA, 32)
 #    define B0 PAL_LINE(GPIOB, 0)
 #    define B1 PAL_LINE(GPIOB, 1)
 #    define B2 PAL_LINE(GPIOB, 2)
@@ -90,6 +107,19 @@
 #    define B17 PAL_LINE(GPIOB, 17)
 #    define B18 PAL_LINE(GPIOB, 18)
 #    define B19 PAL_LINE(GPIOB, 19)
+#    define B20 PAL_LINE(GPIOB, 20)
+#    define B21 PAL_LINE(GPIOB, 21)
+#    define B22 PAL_LINE(GPIOB, 22)
+#    define B23 PAL_LINE(GPIOB, 23)
+#    define B24 PAL_LINE(GPIOB, 24)
+#    define B25 PAL_LINE(GPIOB, 25)
+#    define B26 PAL_LINE(GPIOB, 26)
+#    define B27 PAL_LINE(GPIOB, 27)
+#    define B28 PAL_LINE(GPIOB, 28)
+#    define B29 PAL_LINE(GPIOB, 29)
+#    define B30 PAL_LINE(GPIOB, 30)
+#    define B31 PAL_LINE(GPIOB, 31)
+#    define B32 PAL_LINE(GPIOB, 32)
 #    define C0 PAL_LINE(GPIOC, 0)
 #    define C1 PAL_LINE(GPIOC, 1)
 #    define C2 PAL_LINE(GPIOC, 2)
@@ -106,6 +136,23 @@
 #    define C13 PAL_LINE(GPIOC, 13)
 #    define C14 PAL_LINE(GPIOC, 14)
 #    define C15 PAL_LINE(GPIOC, 15)
+#    define C16 PAL_LINE(GPIOC, 16)
+#    define C17 PAL_LINE(GPIOC, 17)
+#    define C18 PAL_LINE(GPIOC, 18)
+#    define C19 PAL_LINE(GPIOC, 19)
+#    define C20 PAL_LINE(GPIOC, 20)
+#    define C21 PAL_LINE(GPIOC, 21)
+#    define C22 PAL_LINE(GPIOC, 22)
+#    define C23 PAL_LINE(GPIOC, 23)
+#    define C24 PAL_LINE(GPIOC, 24)
+#    define C25 PAL_LINE(GPIOC, 25)
+#    define C26 PAL_LINE(GPIOC, 26)
+#    define C27 PAL_LINE(GPIOC, 27)
+#    define C28 PAL_LINE(GPIOC, 28)
+#    define C29 PAL_LINE(GPIOC, 29)
+#    define C30 PAL_LINE(GPIOC, 30)
+#    define C31 PAL_LINE(GPIOC, 31)
+#    define C32 PAL_LINE(GPIOC, 32)
 #    define D0 PAL_LINE(GPIOD, 0)
 #    define D1 PAL_LINE(GPIOD, 1)
 #    define D2 PAL_LINE(GPIOD, 2)
@@ -122,6 +169,23 @@
 #    define D13 PAL_LINE(GPIOD, 13)
 #    define D14 PAL_LINE(GPIOD, 14)
 #    define D15 PAL_LINE(GPIOD, 15)
+#    define D16 PAL_LINE(GPIOD, 16)
+#    define D17 PAL_LINE(GPIOD, 17)
+#    define D18 PAL_LINE(GPIOD, 18)
+#    define D19 PAL_LINE(GPIOD, 19)
+#    define D20 PAL_LINE(GPIOD, 20)
+#    define D21 PAL_LINE(GPIOD, 21)
+#    define D22 PAL_LINE(GPIOD, 22)
+#    define D23 PAL_LINE(GPIOD, 23)
+#    define D24 PAL_LINE(GPIOD, 24)
+#    define D25 PAL_LINE(GPIOD, 25)
+#    define D26 PAL_LINE(GPIOD, 26)
+#    define D27 PAL_LINE(GPIOD, 27)
+#    define D28 PAL_LINE(GPIOD, 28)
+#    define D29 PAL_LINE(GPIOD, 29)
+#    define D30 PAL_LINE(GPIOD, 30)
+#    define D31 PAL_LINE(GPIOD, 31)
+#    define D32 PAL_LINE(GPIOD, 32)
 #    define E0 PAL_LINE(GPIOE, 0)
 #    define E1 PAL_LINE(GPIOE, 1)
 #    define E2 PAL_LINE(GPIOE, 2)
@@ -138,6 +202,23 @@
 #    define E13 PAL_LINE(GPIOE, 13)
 #    define E14 PAL_LINE(GPIOE, 14)
 #    define E15 PAL_LINE(GPIOE, 15)
+#    define E16 PAL_LINE(GPIOE, 16)
+#    define E17 PAL_LINE(GPIOE, 17)
+#    define E18 PAL_LINE(GPIOE, 18)
+#    define E19 PAL_LINE(GPIOE, 19)
+#    define E20 PAL_LINE(GPIOE, 20)
+#    define E21 PAL_LINE(GPIOE, 21)
+#    define E22 PAL_LINE(GPIOE, 22)
+#    define E23 PAL_LINE(GPIOE, 23)
+#    define E24 PAL_LINE(GPIOE, 24)
+#    define E25 PAL_LINE(GPIOE, 25)
+#    define E26 PAL_LINE(GPIOE, 26)
+#    define E27 PAL_LINE(GPIOE, 27)
+#    define E28 PAL_LINE(GPIOE, 28)
+#    define E29 PAL_LINE(GPIOE, 29)
+#    define E30 PAL_LINE(GPIOE, 30)
+#    define E31 PAL_LINE(GPIOE, 31)
+#    define E32 PAL_LINE(GPIOE, 32)
 #    define F0 PAL_LINE(GPIOF, 0)
 #    define F1 PAL_LINE(GPIOF, 1)
 #    define F2 PAL_LINE(GPIOF, 2)
diff --git a/tmk_core/common/chibios/sleep_led.c b/tmk_core/common/chibios/sleep_led.c
index 5595eec0e5..1c65016a42 100644
--- a/tmk_core/common/chibios/sleep_led.c
+++ b/tmk_core/common/chibios/sleep_led.c
@@ -9,21 +9,13 @@
  * Use LP timer on Kinetises, TIM14 on STM32F0.
  */
 
-#if defined(KL2x) || defined(K20x)
-
-/* Use Low Power Timer (LPTMR) */
-#    define TIMER_INTERRUPT_VECTOR KINETIS_LPTMR0_IRQ_VECTOR
-#    define RESET_COUNTER LPTMR0->CSR |= LPTMRx_CSR_TCF
-
-#elif defined(STM32F0XX)
-
-/* Use TIM14 manually */
-#    define TIMER_INTERRUPT_VECTOR STM32_TIM14_HANDLER
-#    define RESET_COUNTER STM32_TIM14->SR &= ~STM32_TIM_SR_UIF
-
+#ifndef SLEEP_LED_GPT_DRIVER
+#    if defined(STM32F0XX)
+#        define SLEEP_LED_GPT_DRIVER GPTD14
+#    endif
 #endif
 
-#if defined(KL2x) || defined(K20x) || defined(STM32F0XX) /* common parts for timers/interrupts */
+#if defined(KL2x) || defined(K20x) || defined(SLEEP_LED_GPT_DRIVER) /* common parts for timers/interrupts */
 
 /* Breathing Sleep LED brighness(PWM On period) table
  * (64[steps] * 4[duration]) / 64[PWM periods/s] = 4 second breath cycle
@@ -33,10 +25,7 @@
  */
 static const uint8_t breathing_table[64] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 6, 10, 15, 23, 32, 44, 58, 74, 93, 113, 135, 157, 179, 199, 218, 233, 245, 252, 255, 252, 245, 233, 218, 199, 179, 157, 135, 113, 93, 74, 58, 44, 32, 23, 15, 10, 6, 4, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 
-/* interrupt handler */
-OSAL_IRQ_HANDLER(TIMER_INTERRUPT_VECTOR) {
-    OSAL_IRQ_PROLOGUE();
-
+void sleep_led_timer_callback(void) {
     /* Software PWM
      * timer:1111 1111 1111 1111
      *       \_____/\/ \_______/____  count(0-255)
@@ -64,20 +53,19 @@ OSAL_IRQ_HANDLER(TIMER_INTERRUPT_VECTOR) {
     if (timer.pwm.count == breathing_table[timer.pwm.index]) {
         led_set(0);
     }
-
-    /* Reset the counter */
-    RESET_COUNTER;
-
-    OSAL_IRQ_EPILOGUE();
 }
 
 #endif /* common parts for known platforms */
 
 #if defined(KL2x) || defined(K20x) /* platform selection: familiar Kinetis chips */
 
+/* Use Low Power Timer (LPTMR) */
+#    define TIMER_INTERRUPT_VECTOR KINETIS_LPTMR0_IRQ_VECTOR
+#    define RESET_COUNTER LPTMR0->CSR |= LPTMRx_CSR_TCF
+
 /* LPTMR clock options */
 #    define LPTMR_CLOCK_MCGIRCLK 0 /* 4MHz clock */
-#    define LPTMR_CLOCK_LPO 1      /* 1kHz clock */
+#    define LPTMR_CLOCK_LPO 1 /* 1kHz clock */
 #    define LPTMR_CLOCK_ERCLK32K 2 /* external 32kHz crystal */
 #    define LPTMR_CLOCK_OSCERCLK 3 /* output from OSC */
 
@@ -86,6 +74,18 @@ OSAL_IRQ_HANDLER(TIMER_INTERRUPT_VECTOR) {
 #        define SIM_SCGC5_LPTMR SIM_SCGC5_LPTIMER
 #    endif
 
+/* interrupt handler */
+OSAL_IRQ_HANDLER(TIMER_INTERRUPT_VECTOR) {
+    OSAL_IRQ_PROLOGUE();
+
+    sleep_led_timer_callback();
+
+    /* Reset the counter */
+    RESET_COUNTER;
+
+    OSAL_IRQ_EPILOGUE();
+}
+
 /* Initialise the timer */
 void sleep_led_init(void) {
     /* Make sure the clock to the LPTMR is enabled */
@@ -121,7 +121,7 @@ void sleep_led_init(void) {
     MCG->C2 |= MCG_C2_IRCS;  // fast (4MHz) internal ref clock
 #        if defined(KL27)    // divide the 8MHz IRC by 2, to have the same MCGIRCLK speed as others
     MCG->MC |= MCG_MC_LIRC_DIV2_DIV2;
-#        endif                  /* KL27 */
+#        endif /* KL27 */
     MCG->C1 |= MCG_C1_IRCLKEN;  // enable internal ref clock
     //  to work in stop mode, also MCG_C1_IREFSTEN
     //  Divide 4MHz by 2^N (N=6) => 62500 irqs/sec =>
@@ -159,45 +159,23 @@ void sleep_led_toggle(void) {
     LPTMR0->CSR ^= LPTMRx_CSR_TEN;
 }
 
-#elif defined(STM32F0XX) /* platform selection: STM32F0XX */
-
-/* Initialise the timer */
-void sleep_led_init(void) {
-    /* enable clock */
-    rccEnableTIM14(FALSE); /* low power enable = FALSE */
-    rccResetTIM14();
-
-    /* prescale */
-    /* Assuming 48MHz internal clock */
-    /* getting cca 65484 irqs/sec */
-    STM32_TIM14->PSC = 733;
+#elif defined(SLEEP_LED_GPT_DRIVER)
 
-    /* auto-reload */
-    /* 0 => interrupt every time */
-    STM32_TIM14->ARR = 3;
+static void gptTimerCallback(GPTDriver *gptp) {
+    (void)gptp;
+    sleep_led_timer_callback();
+}
 
-    /* enable counter update event interrupt */
-    STM32_TIM14->DIER |= STM32_TIM_DIER_UIE;
+static const GPTConfig gptcfg = {1000000, gptTimerCallback, 0, 0};
 
-    /* register interrupt vector */
-    nvicEnableVector(STM32_TIM14_NUMBER, 2); /* vector, priority */
-}
+/* Initialise the timer */
+void sleep_led_init(void) { gptStart(&SLEEP_LED_GPT_DRIVER, &gptcfg); }
 
-void sleep_led_enable(void) {
-    /* Enable the timer */
-    STM32_TIM14->CR1 = STM32_TIM_CR1_CEN | STM32_TIM_CR1_URS;
-    /* URS => update event only on overflow; setting UG bit disabled */
-}
+void sleep_led_enable(void) { gptStartContinuous(&SLEEP_LED_GPT_DRIVER, gptcfg.frequency / 0xFFFF); }
 
-void sleep_led_disable(void) {
-    /* Disable the timer */
-    STM32_TIM14->CR1 = 0;
-}
+void sleep_led_disable(void) { gptStopTimer(&SLEEP_LED_GPT_DRIVER); }
 
-void sleep_led_toggle(void) {
-    /* Toggle the timer */
-    STM32_TIM14->CR1 ^= STM32_TIM_CR1_CEN;
-}
+void sleep_led_toggle(void) { (SLEEP_LED_GPT_DRIVER.state == GPT_READY) ? sleep_led_enable() : sleep_led_disable(); }
 
 #else /* platform selection: not on familiar chips */
 
diff --git a/tmk_core/common/chibios/suspend.c b/tmk_core/common/chibios/suspend.c
index 49e20641fb..38517e06f0 100644
--- a/tmk_core/common/chibios/suspend.c
+++ b/tmk_core/common/chibios/suspend.c
@@ -24,6 +24,13 @@
 #    include "rgblight.h"
 #endif
 
+#ifdef LED_MATRIX_ENABLE
+#    include "led_matrix.h"
+#endif
+#ifdef RGB_MATRIX_ENABLE
+#    include "rgb_matrix.h"
+#endif
+
 /** \brief suspend idle
  *
  * FIXME: needs doc
@@ -53,6 +60,13 @@ void suspend_power_down(void) {
     backlight_set(0);
 #endif
 
+#ifdef LED_MATRIX_ENABLE
+    led_matrix_task();
+#endif
+#ifdef RGB_MATRIX_ENABLE
+    rgb_matrix_task();
+#endif
+
     // Turn off LED indicators
     uint8_t leds_off = 0;
 #if defined(BACKLIGHT_CAPS_LOCK) && defined(BACKLIGHT_ENABLE)
@@ -69,6 +83,13 @@ void suspend_power_down(void) {
 #if defined(RGBLIGHT_SLEEP) && defined(RGBLIGHT_ENABLE)
     rgblight_suspend();
 #endif
+
+#if defined(LED_MATRIX_ENABLE)
+    led_matrix_set_suspend_state(true);
+#endif
+#if defined(RGB_MATRIX_ENABLE)
+    rgb_matrix_set_suspend_state(true);
+#endif
 #ifdef AUDIO_ENABLE
     stop_all_notes();
 #endif /* AUDIO_ENABLE */
@@ -137,5 +158,12 @@ void suspend_wakeup_init(void) {
 #if defined(RGBLIGHT_SLEEP) && defined(RGBLIGHT_ENABLE)
     rgblight_wakeup();
 #endif
+
+#if defined(LED_MATRIX_ENABLE)
+    led_matrix_set_suspend_state(false);
+#endif
+#if defined(RGB_MATRIX_ENABLE)
+    rgb_matrix_set_suspend_state(false);
+#endif
     suspend_wakeup_init_kb();
 }
diff --git a/tmk_core/common/chibios/wait.c b/tmk_core/common/chibios/wait.c
new file mode 100644
index 0000000000..c6270fd95e
--- /dev/null
+++ b/tmk_core/common/chibios/wait.c
@@ -0,0 +1,89 @@
+/* Copyright 2021 QMK
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __OPTIMIZE__
+#    pragma message "Compiler optimizations disabled; wait_cpuclock() won't work as designed"
+#endif
+
+#define CLOCK_DELAY_NOP8 "nop\n\t nop\n\t nop\n\t nop\n\t   nop\n\t nop\n\t nop\n\t nop\n\t"
+
+__attribute__((always_inline)) static inline void wait_cpuclock(unsigned int n) { /* n: 1..135 */
+    /* The argument n must be a constant expression.
+     * That way, compiler optimization will remove unnecessary code. */
+    if (n < 1) {
+        return;
+    }
+    if (n > 8) {
+        unsigned int n8 = n / 8;
+        n               = n - n8 * 8;
+        switch (n8) {
+            case 16:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 15:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 14:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 13:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 12:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 11:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 10:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 9:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 8:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 7:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 6:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 5:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 4:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 3:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 2:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 1:
+                asm volatile(CLOCK_DELAY_NOP8::: "memory");
+            case 0:
+                break;
+        }
+    }
+    switch (n) {
+        case 8:
+            asm volatile("nop" ::: "memory");
+        case 7:
+            asm volatile("nop" ::: "memory");
+        case 6:
+            asm volatile("nop" ::: "memory");
+        case 5:
+            asm volatile("nop" ::: "memory");
+        case 4:
+            asm volatile("nop" ::: "memory");
+        case 3:
+            asm volatile("nop" ::: "memory");
+        case 2:
+            asm volatile("nop" ::: "memory");
+        case 1:
+            asm volatile("nop" ::: "memory");
+        case 0:
+            break;
+    }
+}
\ No newline at end of file