diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index d49d2d00b9..569ff1bf08 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.
@@ -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/DUE/HAL_SPI.cpp b/Marlin/src/HAL/DUE/HAL_SPI.cpp
index c5e8f2433d..2b613a45ba 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/timers.cpp b/Marlin/src/HAL/DUE/timers.cpp
index a7bf7fbd6d..6555edece3 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 cde03bc0d1..9831701f83 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 953bcbbed1..06f59c676a 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 16db8c86d3..4398cc0fc9 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 e144db8291..6cbf39d1d1 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 3e77b65836..e9f418689e 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 466fc80203..bb203cf8d4 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 d60d93dadd..4661202e8a 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 3b5acc1656..69ea291724 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 c27c84e8c3..3c959cd491 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/STM32/timers.h b/Marlin/src/HAL/STM32/timers.h
index aad543229e..37512da959 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 112c730b9a..f00ac9e3fb 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 3b073d63ab..85381ea481 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 6c342bbe0d..63ec5e4895 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 6611f9ec4e..50a2bf9df2 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 ba5ecdad05..f59e0aae80 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/module/planner.cpp b/Marlin/src/module/planner.cpp
index 17d279cfa5..1f10aba01b 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 380c35755c..b83c445260 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; }
/**