diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index 569ff1bf083..cf54cff991c 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -561,7 +561,7 @@
* FAST_PWM_FAN_FREQUENCY
* Set this to your desired frequency.
* For AVR, if left undefined this defaults to F = F_CPU/(2*255*1)
- * i.e., F = 31.4KHz on 16MHz microcontrollers or F = 39.2KHz on 20MHz microcontrollers.
+ * i.e., F = 31.4kHz on 16MHz microcontrollers or F = 39.2kHz on 20MHz microcontrollers.
* For non AVR, if left undefined this defaults to F = 1Khz.
* This F value is only to protect the hardware from an absence of configuration
* and not to complete it when users are not aware that the frequency must be specifically set to support the target board.
@@ -571,8 +571,8 @@
*
* USE_OCR2A_AS_TOP [undefined by default]
* Boards that use TIMER2 for PWM have limitations resulting in only a few possible frequencies on TIMER2:
- * 16MHz MCUs: [62.5KHz, 31.4KHz (default), 7.8KHz, 3.92KHz, 1.95KHz, 977Hz, 488Hz, 244Hz, 60Hz, 122Hz, 30Hz]
- * 20MHz MCUs: [78.1KHz, 39.2KHz (default), 9.77KHz, 4.9KHz, 2.44KHz, 1.22KHz, 610Hz, 305Hz, 153Hz, 76Hz, 38Hz]
+ * 16MHz MCUs: [62.5kHz, 31.4kHz (default), 7.8kHz, 3.92kHz, 1.95kHz, 977Hz, 488Hz, 244Hz, 60Hz, 122Hz, 30Hz]
+ * 20MHz MCUs: [78.1kHz, 39.2kHz (default), 9.77kHz, 4.9kHz, 2.44kHz, 1.22kHz, 610Hz, 305Hz, 153Hz, 76Hz, 38Hz]
* A greater range can be achieved by enabling USE_OCR2A_AS_TOP. But note that this option blocks the use of
* PWM on pin OC2A. Only use this option if you don't need PWM on 0C2A. (Check your schematic.)
* USE_OCR2A_AS_TOP sacrifices duty cycle control resolution to achieve this broader range of frequencies.
@@ -1179,7 +1179,7 @@
/**
* Adaptive Step Smoothing increases the resolution of multi-axis moves, particularly at step frequencies
- * below 1KHz (for AVR) or 10KHz (for ARM), where aliasing between axes in multi-axis moves causes audible
+ * below 1kHz (for AVR) or 10kHz (for ARM), where aliasing between axes in multi-axis moves causes audible
* vibration and surface artifacts. The algorithm adapts to provide the best possible step smoothing at the
* lowest stepping frequencies.
*/
@@ -3419,14 +3419,14 @@
/**
* PHOTO_PULSES_US may need adjustment depending on board and camera model.
- * Pin must be running at 48.4KHz.
+ * Pin must be running at 48.4kHz.
* Be sure to use a PHOTOGRAPH_PIN which can rise and fall quick enough.
* (e.g., MKS SBase temp sensor pin was too slow, so used P1.23 on J8.)
*
* Example pulse data for Nikon: https://bit.ly/2FKD0Aq
* IR Wiring: https://git.io/JvJf7
*/
- //#define PHOTO_PULSES_US { 2000, 27850, 400, 1580, 400, 3580, 400 } // (µs) Durations for each 48.4KHz oscillation
+ //#define PHOTO_PULSES_US { 2000, 27850, 400, 1580, 400, 3580, 400 } // (µs) Durations for each 48.4kHz oscillation
#ifdef PHOTO_PULSES_US
#define PHOTO_PULSE_DELAY_US 13 // (µs) Approximate duration of each HIGH and LOW pulse in the oscillation
#endif
diff --git a/Marlin/src/HAL/AVR/fastio.cpp b/Marlin/src/HAL/AVR/fastio.cpp
index 8af3ef805ef..5083893ae3f 100644
--- a/Marlin/src/HAL/AVR/fastio.cpp
+++ b/Marlin/src/HAL/AVR/fastio.cpp
@@ -245,7 +245,7 @@ uint16_t set_pwm_frequency_hz(const_float_t hz, const float dca, const float dcb
float count = 0;
if (hz > 0 && (dca || dcb || dcc)) {
count = float(F_CPU) / hz; // 1x prescaler, TOP for 16MHz base freq.
- uint16_t prescaler; // Range of 30.5Hz (65535) 64.5KHz (>31)
+ uint16_t prescaler; // Range of 30.5Hz (65535) 64.5kHz (>31)
if (count >= 255. * 256.) { prescaler = 1024; SET_CS(5, PRESCALER_1024); }
else if (count >= 255. * 64.) { prescaler = 256; SET_CS(5, PRESCALER_256); }
@@ -277,7 +277,7 @@ uint16_t set_pwm_frequency_hz(const_float_t hz, const float dca, const float dcb
// Restore the default for Timer 5
SET_WGM(5, PWM_PC_8); // PWM 8-bit (Phase Correct)
SET_COMS(5, NORMAL, NORMAL, NORMAL); // Do nothing
- SET_CS(5, PRESCALER_64); // 16MHz / 64 = 250KHz
+ SET_CS(5, PRESCALER_64); // 16MHz / 64 = 250kHz
OCR5A = OCR5B = OCR5C = 0;
}
return round(count);
diff --git a/Marlin/src/HAL/DUE/HAL_SPI.cpp b/Marlin/src/HAL/DUE/HAL_SPI.cpp
index 2b613a45bae..c5e8f2433d7 100644
--- a/Marlin/src/HAL/DUE/HAL_SPI.cpp
+++ b/Marlin/src/HAL/DUE/HAL_SPI.cpp
@@ -491,9 +491,9 @@
* 1 : 4 - 5 MHz
* 2 : 2 - 2.5 MHz
* 3 : 1 - 1.25 MHz
- * 4 : 500 - 625 KHz
- * 5 : 250 - 312 KHz
- * 6 : 125 - 156 KHz
+ * 4 : 500 - 625 kHz
+ * 5 : 250 - 312 kHz
+ * 6 : 125 - 156 kHz
*/
void spiInit(uint8_t spiRate) {
switch (spiRate) {
diff --git a/Marlin/src/HAL/DUE/fastio/G2_PWM.cpp b/Marlin/src/HAL/DUE/fastio/G2_PWM.cpp
index d9fbabce214..800915ff692 100644
--- a/Marlin/src/HAL/DUE/fastio/G2_PWM.cpp
+++ b/Marlin/src/HAL/DUE/fastio/G2_PWM.cpp
@@ -25,7 +25,7 @@
* is NOT used to directly toggle pins. The ISR writes to the pin assigned to
* that interrupt.
*
- * All PWMs use the same repetition rate. The G2 needs about 10KHz min in order to
+ * All PWMs use the same repetition rate. The G2 needs about 10kHz min in order to
* not have obvious ripple on the Vref signals.
*
* The data structures are setup to minimize the computation done by the ISR which
diff --git a/Marlin/src/HAL/DUE/pinsDebug.h b/Marlin/src/HAL/DUE/pinsDebug.h
index f01c53c8ce0..6c08585974f 100644
--- a/Marlin/src/HAL/DUE/pinsDebug.h
+++ b/Marlin/src/HAL/DUE/pinsDebug.h
@@ -53,7 +53,7 @@
* The net result is that both the g_pinStatus[pin] array and the PIO_OSR register
* needs to be looked at when determining if a pin is an input or an output.
*
- * b) Due has only pins 6, 7, 8 & 9 enabled for PWMs. FYI - they run at 1KHz
+ * b) Due has only pins 6, 7, 8 & 9 enabled for PWMs. FYI - they run at 1kHz
*
* c) NUM_DIGITAL_PINS does not include the analog pins
*
diff --git a/Marlin/src/HAL/DUE/timers.cpp b/Marlin/src/HAL/DUE/timers.cpp
index 6555edece3f..a7bf7fbd6d8 100644
--- a/Marlin/src/HAL/DUE/timers.cpp
+++ b/Marlin/src/HAL/DUE/timers.cpp
@@ -62,7 +62,7 @@ const tTimerConfig timer_config[NUM_HARDWARE_TIMERS] = {
Timer_clock1: Prescaler 2 -> 42MHz
Timer_clock2: Prescaler 8 -> 10.5MHz
Timer_clock3: Prescaler 32 -> 2.625MHz
- Timer_clock4: Prescaler 128 -> 656.25KHz
+ Timer_clock4: Prescaler 128 -> 656.25kHz
*/
void HAL_timer_start(const uint8_t timer_num, const uint32_t frequency) {
diff --git a/Marlin/src/HAL/DUE/usb/genclk.h b/Marlin/src/HAL/DUE/usb/genclk.h
index 9831701f836..cde03bc0d10 100644
--- a/Marlin/src/HAL/DUE/usb/genclk.h
+++ b/Marlin/src/HAL/DUE/usb/genclk.h
@@ -74,9 +74,9 @@ extern "C" {
//@{
enum genclk_source {
- GENCLK_PCK_SRC_SLCK_RC = 0, //!< Internal 32KHz RC oscillator as PCK source clock
- GENCLK_PCK_SRC_SLCK_XTAL = 1, //!< External 32KHz crystal oscillator as PCK source clock
- GENCLK_PCK_SRC_SLCK_BYPASS = 2, //!< External 32KHz bypass oscillator as PCK source clock
+ GENCLK_PCK_SRC_SLCK_RC = 0, //!< Internal 32kHz RC oscillator as PCK source clock
+ GENCLK_PCK_SRC_SLCK_XTAL = 1, //!< External 32kHz crystal oscillator as PCK source clock
+ GENCLK_PCK_SRC_SLCK_BYPASS = 2, //!< External 32kHz bypass oscillator as PCK source clock
GENCLK_PCK_SRC_MAINCK_4M_RC = 3, //!< Internal 4MHz RC oscillator as PCK source clock
GENCLK_PCK_SRC_MAINCK_8M_RC = 4, //!< Internal 8MHz RC oscillator as PCK source clock
GENCLK_PCK_SRC_MAINCK_12M_RC = 5, //!< Internal 12MHz RC oscillator as PCK source clock
diff --git a/Marlin/src/HAL/DUE/usb/osc.h b/Marlin/src/HAL/DUE/usb/osc.h
index 06f59c676a6..953bcbbed1d 100644
--- a/Marlin/src/HAL/DUE/usb/osc.h
+++ b/Marlin/src/HAL/DUE/usb/osc.h
@@ -93,9 +93,9 @@ extern "C" {
//! \name Oscillator identifiers
//@{
-#define OSC_SLCK_32K_RC 0 //!< Internal 32KHz RC oscillator.
-#define OSC_SLCK_32K_XTAL 1 //!< External 32KHz crystal oscillator.
-#define OSC_SLCK_32K_BYPASS 2 //!< External 32KHz bypass oscillator.
+#define OSC_SLCK_32K_RC 0 //!< Internal 32kHz RC oscillator.
+#define OSC_SLCK_32K_XTAL 1 //!< External 32kHz crystal oscillator.
+#define OSC_SLCK_32K_BYPASS 2 //!< External 32kHz bypass oscillator.
#define OSC_MAINCK_4M_RC 3 //!< Internal 4MHz RC oscillator.
#define OSC_MAINCK_8M_RC 4 //!< Internal 8MHz RC oscillator.
#define OSC_MAINCK_12M_RC 5 //!< Internal 12MHz RC oscillator.
@@ -105,9 +105,9 @@ extern "C" {
//! \name Oscillator clock speed in hertz
//@{
-#define OSC_SLCK_32K_RC_HZ CHIP_FREQ_SLCK_RC //!< Internal 32KHz RC oscillator.
-#define OSC_SLCK_32K_XTAL_HZ BOARD_FREQ_SLCK_XTAL //!< External 32KHz crystal oscillator.
-#define OSC_SLCK_32K_BYPASS_HZ BOARD_FREQ_SLCK_BYPASS //!< External 32KHz bypass oscillator.
+#define OSC_SLCK_32K_RC_HZ CHIP_FREQ_SLCK_RC //!< Internal 32kHz RC oscillator.
+#define OSC_SLCK_32K_XTAL_HZ BOARD_FREQ_SLCK_XTAL //!< External 32kHz crystal oscillator.
+#define OSC_SLCK_32K_BYPASS_HZ BOARD_FREQ_SLCK_BYPASS //!< External 32kHz bypass oscillator.
#define OSC_MAINCK_4M_RC_HZ CHIP_FREQ_MAINCK_RC_4MHZ //!< Internal 4MHz RC oscillator.
#define OSC_MAINCK_8M_RC_HZ CHIP_FREQ_MAINCK_RC_8MHZ //!< Internal 8MHz RC oscillator.
#define OSC_MAINCK_12M_RC_HZ CHIP_FREQ_MAINCK_RC_12MHZ //!< Internal 12MHz RC oscillator.
diff --git a/Marlin/src/HAL/DUE/usb/sysclk.h b/Marlin/src/HAL/DUE/usb/sysclk.h
index 4398cc0fc9f..16db8c86d37 100644
--- a/Marlin/src/HAL/DUE/usb/sysclk.h
+++ b/Marlin/src/HAL/DUE/usb/sysclk.h
@@ -156,9 +156,9 @@ extern "C" {
//! \name Master Clock Sources (MCK)
//@{
-#define SYSCLK_SRC_SLCK_RC 0 //!< Internal 32KHz RC oscillator as master source clock
-#define SYSCLK_SRC_SLCK_XTAL 1 //!< External 32KHz crystal oscillator as master source clock
-#define SYSCLK_SRC_SLCK_BYPASS 2 //!< External 32KHz bypass oscillator as master source clock
+#define SYSCLK_SRC_SLCK_RC 0 //!< Internal 32kHz RC oscillator as master source clock
+#define SYSCLK_SRC_SLCK_XTAL 1 //!< External 32kHz crystal oscillator as master source clock
+#define SYSCLK_SRC_SLCK_BYPASS 2 //!< External 32kHz bypass oscillator as master source clock
#define SYSCLK_SRC_MAINCK_4M_RC 3 //!< Internal 4MHz RC oscillator as master source clock
#define SYSCLK_SRC_MAINCK_8M_RC 4 //!< Internal 8MHz RC oscillator as master source clock
#define SYSCLK_SRC_MAINCK_12M_RC 5 //!< Internal 12MHz RC oscillator as master source clock
diff --git a/Marlin/src/HAL/DUE/watchdog.cpp b/Marlin/src/HAL/DUE/watchdog.cpp
index 6cbf39d1d11..e144db8291e 100644
--- a/Marlin/src/HAL/DUE/watchdog.cpp
+++ b/Marlin/src/HAL/DUE/watchdog.cpp
@@ -39,7 +39,7 @@ void watchdogSetup() {
uint32_t timeout = TERN(WATCHDOG_DURATION_8S, 8000, 4000);
// Calculate timeout value in WDT counter ticks: This assumes
- // the slow clock is running at 32.768 KHz watchdog
+ // the slow clock is running at 32.768 kHz watchdog
// frequency is therefore 32768 / 128 = 256 Hz
timeout = (timeout << 8) / 1000;
if (timeout == 0)
diff --git a/Marlin/src/HAL/ESP32/i2s.cpp b/Marlin/src/HAL/ESP32/i2s.cpp
index e9f418689e8..3e77b658360 100644
--- a/Marlin/src/HAL/ESP32/i2s.cpp
+++ b/Marlin/src/HAL/ESP32/i2s.cpp
@@ -176,7 +176,7 @@ int i2s_init() {
*
* fwclk = fbclk / 32
*
- * for fwclk = 250KHz (4µS pulse time)
+ * for fwclk = 250kHz (4µS pulse time)
* N = 10
* M = 20
*/
diff --git a/Marlin/src/HAL/LPC1768/u8g/LCD_pin_routines.c b/Marlin/src/HAL/LPC1768/u8g/LCD_pin_routines.c
index bb203cf8d47..466fc802033 100644
--- a/Marlin/src/HAL/LPC1768/u8g/LCD_pin_routines.c
+++ b/Marlin/src/HAL/LPC1768/u8g/LCD_pin_routines.c
@@ -26,7 +26,7 @@
* These are based on the LPC1768 pinMode, digitalRead & digitalWrite routines.
*
* Couldn't just call exact copies because the overhead killed the LCD update speed
- * With an intermediate level the softspi was running in the 10-20KHz range which
+ * With an intermediate level the softspi was running in the 10-20kHz range which
* resulted in using about about 25% of the CPU's time.
*/
diff --git a/Marlin/src/HAL/LPC1768/u8g/LCD_pin_routines.h b/Marlin/src/HAL/LPC1768/u8g/LCD_pin_routines.h
index 4661202e8ac..d60d93daddb 100644
--- a/Marlin/src/HAL/LPC1768/u8g/LCD_pin_routines.h
+++ b/Marlin/src/HAL/LPC1768/u8g/LCD_pin_routines.h
@@ -27,7 +27,7 @@
* These are based on the LPC1768 pinMode, digitalRead & digitalWrite routines.
*
* Couldn't just call exact copies because the overhead killed the LCD update speed
- * With an intermediate level the softspi was running in the 10-20KHz range which
+ * With an intermediate level the softspi was running in the 10-20kHz range which
* resulted in using about about 25% of the CPU's time.
*/
diff --git a/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_pin_routines.cpp b/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_pin_routines.cpp
index 69ea2917248..3b5acc1656c 100644
--- a/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_pin_routines.cpp
+++ b/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_pin_routines.cpp
@@ -26,7 +26,7 @@
* These are based on the LPC1768 pinMode, digitalRead & digitalWrite routines.
*
* Couldn't just call exact copies because the overhead killed the LCD update speed
- * With an intermediate level the softspi was running in the 10-20KHz range which
+ * With an intermediate level the softspi was running in the 10-20kHz range which
* resulted in using about about 25% of the CPU's time.
*/
diff --git a/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_pin_routines.h b/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_pin_routines.h
index 3c959cd4911..c27c84e8c39 100644
--- a/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_pin_routines.h
+++ b/Marlin/src/HAL/NATIVE_SIM/u8g/LCD_pin_routines.h
@@ -27,7 +27,7 @@
* These are based on the LPC1768 pinMode, digitalRead & digitalWrite routines.
*
* Couldn't just call exact copies because the overhead killed the LCD update speed
- * With an intermediate level the softspi was running in the 10-20KHz range which
+ * With an intermediate level the softspi was running in the 10-20kHz range which
* resulted in using about about 25% of the CPU's time.
*/
diff --git a/Marlin/src/HAL/SAMD51/timers.cpp b/Marlin/src/HAL/SAMD51/timers.cpp
index ce13dd231ec..1ad0e360736 100644
--- a/Marlin/src/HAL/SAMD51/timers.cpp
+++ b/Marlin/src/HAL/SAMD51/timers.cpp
@@ -79,7 +79,7 @@ void HAL_timer_start(const uint8_t timer_num, const uint32_t frequency) {
rtc->MODE0.INTENCLR.reg = RTC_MODE0_INTENCLR_CMP0;
// RTC clock setup
- OSC32KCTRL->RTCCTRL.reg = OSC32KCTRL_RTCCTRL_RTCSEL_XOSC32K; // External 32.768KHz oscillator
+ OSC32KCTRL->RTCCTRL.reg = OSC32KCTRL_RTCCTRL_RTCSEL_XOSC32K; // External 32.768kHz oscillator
// Stop timer, just in case, to be able to reconfigure it
rtc->MODE0.CTRLA.bit.ENABLE = false;
diff --git a/Marlin/src/HAL/STM32/sdio.cpp b/Marlin/src/HAL/STM32/sdio.cpp
index 18b4434dfa7..0af5f9040e5 100644
--- a/Marlin/src/HAL/STM32/sdio.cpp
+++ b/Marlin/src/HAL/STM32/sdio.cpp
@@ -59,7 +59,7 @@ DMA_HandleTypeDef hdma_sdio;
/*
SDIO_INIT_CLK_DIV is 118
SDIO clock frequency is 48MHz / (TRANSFER_CLOCK_DIV + 2)
- SDIO init clock frequency should not exceed 400KHz = 48MHz / (118 + 2)
+ SDIO init clock frequency should not exceed 400kHz = 48MHz / (118 + 2)
Default TRANSFER_CLOCK_DIV is 2 (118 / 40)
Default SDIO clock frequency is 48MHz / (2 + 2) = 12 MHz
diff --git a/Marlin/src/HAL/STM32/timers.h b/Marlin/src/HAL/STM32/timers.h
index 37512da9598..aad543229e1 100644
--- a/Marlin/src/HAL/STM32/timers.h
+++ b/Marlin/src/HAL/STM32/timers.h
@@ -48,7 +48,7 @@
#define TIMER_INDEX_(T) TIMER##T##_INDEX // TIMER#_INDEX enums (timer_index_t) depend on TIM#_BASE defines.
#define TIMER_INDEX(T) TIMER_INDEX_(T) // Convert Timer ID to HardwareTimer_Handle index.
-#define TEMP_TIMER_FREQUENCY 1000 // Temperature::isr() is expected to be called at around 1KHz
+#define TEMP_TIMER_FREQUENCY 1000 // Temperature::isr() is expected to be called at around 1kHz
// TODO: get rid of manual rate/prescale/ticks/cycles taken for procedures in stepper.cpp
#define STEPPER_TIMER_RATE 2000000 // 2 Mhz
diff --git a/Marlin/src/HAL/STM32F1/timers.cpp b/Marlin/src/HAL/STM32F1/timers.cpp
index f00ac9e3fb1..112c730b9ac 100644
--- a/Marlin/src/HAL/STM32F1/timers.cpp
+++ b/Marlin/src/HAL/STM32F1/timers.cpp
@@ -40,7 +40,7 @@
* Timer_clock1: Prescaler 2 -> 36 MHz
* Timer_clock2: Prescaler 8 -> 9 MHz
* Timer_clock3: Prescaler 32 -> 2.25 MHz
- * Timer_clock4: Prescaler 128 -> 562.5 KHz
+ * Timer_clock4: Prescaler 128 -> 562.5 kHz
*/
/**
diff --git a/Marlin/src/HAL/TEENSY31_32/timers.h b/Marlin/src/HAL/TEENSY31_32/timers.h
index 85381ea4816..3b073d63ab2 100644
--- a/Marlin/src/HAL/TEENSY31_32/timers.h
+++ b/Marlin/src/HAL/TEENSY31_32/timers.h
@@ -41,7 +41,7 @@ typedef uint32_t hal_timer_t;
#define FTM0_TIMER_PRESCALE_BITS 0b011
#define FTM1_TIMER_PRESCALE_BITS 0b010
-#define FTM0_TIMER_RATE (F_BUS / (FTM0_TIMER_PRESCALE)) // 60MHz / 8 = 7500KHz
+#define FTM0_TIMER_RATE (F_BUS / (FTM0_TIMER_PRESCALE)) // 60MHz / 8 = 7500kHz
#define FTM1_TIMER_RATE (F_BUS / (FTM1_TIMER_PRESCALE)) // 60MHz / 4 = 15MHz
#define HAL_TIMER_RATE (FTM0_TIMER_RATE)
diff --git a/Marlin/src/HAL/TEENSY35_36/timers.h b/Marlin/src/HAL/TEENSY35_36/timers.h
index 63ec5e4895e..6c342bbe0d2 100644
--- a/Marlin/src/HAL/TEENSY35_36/timers.h
+++ b/Marlin/src/HAL/TEENSY35_36/timers.h
@@ -40,7 +40,7 @@ typedef uint32_t hal_timer_t;
#define FTM0_TIMER_PRESCALE_BITS 0b011
#define FTM1_TIMER_PRESCALE_BITS 0b010
-#define FTM0_TIMER_RATE (F_BUS / FTM0_TIMER_PRESCALE) // 60MHz / 8 = 7500KHz
+#define FTM0_TIMER_RATE (F_BUS / FTM0_TIMER_PRESCALE) // 60MHz / 8 = 7500kHz
#define FTM1_TIMER_RATE (F_BUS / FTM1_TIMER_PRESCALE) // 60MHz / 4 = 15MHz
#define HAL_TIMER_RATE (FTM0_TIMER_RATE)
diff --git a/Marlin/src/HAL/shared/HAL_SPI.h b/Marlin/src/HAL/shared/HAL_SPI.h
index 50a2bf9df21..6611f9ec4e0 100644
--- a/Marlin/src/HAL/shared/HAL_SPI.h
+++ b/Marlin/src/HAL/shared/HAL_SPI.h
@@ -38,9 +38,9 @@
* 1 : 4 - 5 MHz
* 2 : 2 - 2.5 MHz
* 3 : 1 - 1.25 MHz
- * 4 : 500 - 625 KHz
- * 5 : 250 - 312 KHz
- * 6 : 125 - 156 KHz
+ * 4 : 500 - 625 kHz
+ * 5 : 250 - 312 kHz
+ * 6 : 125 - 156 kHz
*
* On AVR, actual speed is F_CPU/2^(1 + index).
* On other platforms, speed should be in range given above where possible.
diff --git a/Marlin/src/feature/digipot/digipot_mcp4451.cpp b/Marlin/src/feature/digipot/digipot_mcp4451.cpp
index f59e0aae806..ba5ecdad050 100644
--- a/Marlin/src/feature/digipot/digipot_mcp4451.cpp
+++ b/Marlin/src/feature/digipot/digipot_mcp4451.cpp
@@ -82,7 +82,7 @@ void DigipotI2C::set_current(const uint8_t channel, const float current) {
void DigipotI2C::init() {
#if MB(MKS_SBASE)
- configure_i2c(16); // Set clock_option to 16 ensure I2C is initialized at 400KHz
+ configure_i2c(16); // Set clock_option to 16 ensure I2C is initialized at 400kHz
#else
Wire.begin();
#endif
diff --git a/Marlin/src/gcode/config/M672.cpp b/Marlin/src/gcode/config/M672.cpp
index af74230516e..257b49471f6 100644
--- a/Marlin/src/gcode/config/M672.cpp
+++ b/Marlin/src/gcode/config/M672.cpp
@@ -53,7 +53,7 @@
// b7 b6 b5 b4 ~b4 ... hi bits, NOT last bit
// b3 b2 b1 b0 ~b0 ... lo bits, NOT last bit
//
-void M672_send(uint8_t b) { // bit rate requirement: 1KHz +/- 30%
+void M672_send(uint8_t b) { // bit rate requirement: 1kHz +/- 30%
LOOP_L_N(bits, 14) {
switch (bits) {
default: { OUT_WRITE(SMART_EFFECTOR_MOD_PIN, !!(b & 0x80)); b <<= 1; break; } // send bit, shift next into place
diff --git a/Marlin/src/gcode/control/M3-M5.cpp b/Marlin/src/gcode/control/M3-M5.cpp
index ddbbc4ab683..2cf22e81ce0 100644
--- a/Marlin/src/gcode/control/M3-M5.cpp
+++ b/Marlin/src/gcode/control/M3-M5.cpp
@@ -43,7 +43,7 @@
*
* If no PWM pin is defined then M3/M4 just turns it on.
*
- * At least 12.8KHz (50Hz * 256) is needed for Spindle PWM.
+ * At least 12.8kHz (50Hz * 256) is needed for Spindle PWM.
* Hardware PWM is required on AVR. ISRs are too slow.
*
* NOTE: WGM for timers 3, 4, and 5 must be either Mode 1 or Mode 5.
diff --git a/Marlin/src/module/endstops.cpp b/Marlin/src/module/endstops.cpp
index b9c5aebf391..939dd6d5376 100644
--- a/Marlin/src/module/endstops.cpp
+++ b/Marlin/src/module/endstops.cpp
@@ -352,7 +352,7 @@ void Endstops::init() {
} // Endstops::init
-// Called at ~1KHz from Temperature ISR: Poll endstop state if required
+// Called at ~1kHz from Temperature ISR: Poll endstop state if required
void Endstops::poll() {
TERN_(PINS_DEBUGGING, run_monitor()); // Report changes in endstop status
@@ -403,7 +403,7 @@ void Endstops::not_homing() {
void Endstops::resync() {
if (!abort_enabled()) return; // If endstops/probes are disabled the loop below can hang
- // Wait for Temperature ISR to run at least once (runs at 1KHz)
+ // Wait for Temperature ISR to run at least once (runs at 1kHz)
TERN(ENDSTOP_INTERRUPTS_FEATURE, update(), safe_delay(2));
while (TERN0(ENDSTOP_NOISE_THRESHOLD, endstop_poll_count)) safe_delay(1);
}
diff --git a/Marlin/src/module/planner.cpp b/Marlin/src/module/planner.cpp
index 1f10aba01b8..17d279cfa5f 100644
--- a/Marlin/src/module/planner.cpp
+++ b/Marlin/src/module/planner.cpp
@@ -2495,7 +2495,7 @@ bool Planner::_populate_block(block_t * const block, bool split_move,
if (extruder_advance_K[active_extruder] * block->e_D_ratio * block->acceleration * 2 < SQRT(block->nominal_speed_sqr) * block->e_D_ratio)
SERIAL_ECHOLNPGM("More than 2 steps per eISR loop executed.");
if (block->advance_speed < 200)
- SERIAL_ECHOLNPGM("eISR running at > 10KHz.");
+ SERIAL_ECHOLNPGM("eISR running at > 10kHz.");
#endif
}
#endif
diff --git a/Marlin/src/module/planner.h b/Marlin/src/module/planner.h
index b83c445260f..380c35755c9 100644
--- a/Marlin/src/module/planner.h
+++ b/Marlin/src/module/planner.h
@@ -883,7 +883,7 @@ class Planner {
static void finish_and_disable();
// Periodic handler to manage the cleaning buffer counter
- // Called from the Temperature ISR at ~1KHz
+ // Called from the Temperature ISR at ~1kHz
static void isr() { if (cleaning_buffer_counter) --cleaning_buffer_counter; }
/**
diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index 0305e5e98ee..bb1768054ee 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -3046,8 +3046,8 @@ public:
};
/**
- * Handle various ~1KHz tasks associated with temperature
- * - Heater PWM (~1KHz with scaler)
+ * Handle various ~1kHz tasks associated with temperature
+ * - Heater PWM (~1kHz with scaler)
* - LCD Button polling (~500Hz)
* - Start / Read one ADC sensor
* - Advance Babysteps
@@ -3549,7 +3549,7 @@ void Temperature::isr() {
adc_sensor_state = next_sensor_state;
//
- // Additional ~1KHz Tasks
+ // Additional ~1kHz Tasks
//
#if ENABLED(BABYSTEPPING) && DISABLED(INTEGRATED_BABYSTEPPING)
diff --git a/buildroot/share/PlatformIO/variants/MARLIN_F103VE_LONGER/hal_conf_custom.h b/buildroot/share/PlatformIO/variants/MARLIN_F103VE_LONGER/hal_conf_custom.h
index 3a6b7037adf..3440343ffa1 100644
--- a/buildroot/share/PlatformIO/variants/MARLIN_F103VE_LONGER/hal_conf_custom.h
+++ b/buildroot/share/PlatformIO/variants/MARLIN_F103VE_LONGER/hal_conf_custom.h
@@ -118,7 +118,7 @@ extern "C" {
#endif
#ifndef LSE_STARTUP_TIMEOUT
- #define LSE_STARTUP_TIMEOUT 50U // No 32.7KHz LSE on this board, reduced to avoid delays
+ #define LSE_STARTUP_TIMEOUT 50U // No 32.7kHz LSE on this board, reduced to avoid delays
#endif
/* Tip: To avoid modifying this file each time you need to use different HSE,