📝 kHz => KHz

Marlin/Configuration_adv.h

  * 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.
 
 /**
  * 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.
  */
 
   /**
    * 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

Marlin/src/HAL/DUE/HAL_SPI.cpp

    *  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) {

Marlin/src/HAL/DUE/timers.cpp

   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) {

Marlin/src/HAL/DUE/usb/genclk.h

 //@{
 
 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

Marlin/src/HAL/DUE/usb/osc.h

 
 //! \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.
 
 //! \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.

Marlin/src/HAL/DUE/usb/sysclk.h

 
 //! \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

Marlin/src/HAL/DUE/watchdog.cpp

     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)

Marlin/src/HAL/ESP32/i2s.cpp

    *
    *   fwclk = fbclk / 32
    *
-   *   for fwclk = 250kHz (4µS pulse time)
+   *   for fwclk = 250KHz (4µS pulse time)
    *      N = 10
    *      M = 20
    */

Marlin/src/HAL/LPC1768/u8g/LCD_pin_routines.c

  * 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.
  */
 

Marlin/src/HAL/LPC1768/u8g/LCD_pin_routines.h

  * 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.
  */
 

Marlin/src/HAL/NATIVE_SIM/u8g/LCD_pin_routines.cpp

  * 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.
  */
 

Marlin/src/HAL/NATIVE_SIM/u8g/LCD_pin_routines.h

  * 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.
  */
 

Marlin/src/HAL/STM32/timers.h

 #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

Marlin/src/HAL/STM32F1/timers.cpp

  * 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
  */
 
 /**

Marlin/src/HAL/TEENSY31_32/timers.h

 #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)

Marlin/src/HAL/TEENSY35_36/timers.h

 #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)

Marlin/src/HAL/shared/HAL_SPI.h

  *  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.

Marlin/src/feature/digipot/digipot_mcp4451.cpp

 
 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

Marlin/src/module/planner.cpp

         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

Marlin/src/module/planner.h

     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; }
 
     /**