📝 KHz => kHz (#23512)

Marlin/Configuration_adv.h

@@ -567,8 +567,8 @@
  *
  * 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]
+ *   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]
+ *   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.

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);

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

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
  *

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;

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

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

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.

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);
 }

Marlin/src/module/temperature.cpp

@@ -3007,8 +3007,8 @@ public:
 };
 
 /**
- * Handle various ~1KHz tasks associated with temperature
+ * Handle various ~1kHz tasks associated with temperature
- *  - Heater PWM (~1KHz with scaler)
+ *  - Heater PWM (~1kHz with scaler)
  *  - LCD Button polling (~500Hz)
  *  - Start / Read one ADC sensor
  *  - Advance Babysteps
@@ -3510,7 +3510,7 @@ void Temperature::isr() {
   adc_sensor_state = next_sensor_state;
 
   //
-  // Additional ~1KHz Tasks
+  // Additional ~1kHz Tasks
   //
 
   #if ENABLED(BABYSTEPPING) && DISABLED(INTEGRATED_BABYSTEPPING)

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,