diff --git a/Marlin/src/HAL/HAL_AVR/HAL_spi_AVR.cpp b/Marlin/src/HAL/HAL_AVR/HAL_spi_AVR.cpp
index 82dce1a57..1379207bf 100644
--- a/Marlin/src/HAL/HAL_AVR/HAL_spi_AVR.cpp
+++ b/Marlin/src/HAL/HAL_AVR/HAL_spi_AVR.cpp
@@ -53,9 +53,9 @@ void spiBegin(void) {
 
 #if NONE(SOFTWARE_SPI, FORCE_SOFT_SPI)
 
-  //------------------------------------------------------------------------------
+  // ------------------------
   // Hardware SPI
-  //------------------------------------------------------------------------------
+  // ------------------------
 
   // make sure SPCR rate is in expected bits
   #if (SPR0 != 0 || SPR1 != 1)
@@ -177,9 +177,9 @@ void spiBegin(void) {
 
 #else // SOFTWARE_SPI || FORCE_SOFT_SPI
 
-  //------------------------------------------------------------------------------
+  // ------------------------
   // Software SPI
-  //------------------------------------------------------------------------------
+  // ------------------------
 
   // nop to tune soft SPI timing
   #define nop asm volatile ("\tnop\n")
diff --git a/Marlin/src/HAL/HAL_DUE/Servo_Due.cpp b/Marlin/src/HAL/HAL_DUE/Servo_Due.cpp
index 2dd9d4c45..aadf297d3 100644
--- a/Marlin/src/HAL/HAL_DUE/Servo_Due.cpp
+++ b/Marlin/src/HAL/HAL_DUE/Servo_Due.cpp
@@ -50,9 +50,9 @@
 
 static volatile int8_t Channel[_Nbr_16timers];              // counter for the servo being pulsed for each timer (or -1 if refresh interval)
 
-//------------------------------------------------------------------------------
+// ------------------------
 /// Interrupt handler for the TC0 channel 1.
-//------------------------------------------------------------------------------
+// ------------------------
 void Servo_Handler(timer16_Sequence_t timer, Tc *pTc, uint8_t channel);
 
 #ifdef _useTimer1
diff --git a/Marlin/src/HAL/HAL_DUE/usb/udi_cdc.c b/Marlin/src/HAL/HAL_DUE/usb/udi_cdc.c
index e54ee570f..60c9546ce 100644
--- a/Marlin/src/HAL/HAL_DUE/usb/udi_cdc.c
+++ b/Marlin/src/HAL/HAL_DUE/usb/udi_cdc.c
@@ -458,7 +458,7 @@ void udi_cdc_data_sof_notify(void)
 }
 
 
-//-------------------------------------------------
+// ------------------------
 //------- Internal routines to control serial line
 
 static uint8_t udi_cdc_setup_to_port(void)
@@ -579,7 +579,7 @@ static void udi_cdc_serial_state_msg_sent(udd_ep_status_t status, iram_size_t n,
 }
 
 
-//-------------------------------------------------
+// ------------------------
 //------- Internal routines to process data transfer
 
 
@@ -781,7 +781,7 @@ static void udi_cdc_tx_send(uint8_t port)
 }
 
 
-//---------------------------------------------
+// ------------------------
 //------- Application interface
 
 
diff --git a/Marlin/src/HAL/HAL_DUE/usb/udi_msc.c b/Marlin/src/HAL/HAL_DUE/usb/udi_msc.c
index 97d3f2990..627bca0d4 100644
--- a/Marlin/src/HAL/HAL_DUE/usb/udi_msc.c
+++ b/Marlin/src/HAL/HAL_DUE/usb/udi_msc.c
@@ -457,7 +457,7 @@ uint8_t udi_msc_getsetting(void)
 }
 
 
-//---------------------------------------------
+// ------------------------
 //------- Routines to process CBW packet
 
 static void udi_msc_cbw_invalid(void)
@@ -613,7 +613,7 @@ static bool udi_msc_cbw_validate(uint32_t alloc_len, uint8_t dir_flag)
 }
 
 
-//---------------------------------------------
+// ------------------------
 //------- Routines to process small data packet
 
 static void udi_msc_data_send(uint8_t * buffer, uint8_t buf_size)
@@ -645,7 +645,7 @@ static void udi_msc_data_sent(udd_ep_status_t status, iram_size_t nb_sent,
 }
 
 
-//---------------------------------------------
+// ------------------------
 //------- Routines to process CSW packet
 
 static void udi_msc_csw_process(void)
@@ -691,7 +691,7 @@ static void udi_msc_csw_sent(udd_ep_status_t status, iram_size_t nb_sent,
 }
 
 
-//---------------------------------------------
+// ------------------------
 //------- Routines manage sense data
 
 static void udi_msc_clear_sense(void)
@@ -757,7 +757,7 @@ static void udi_msc_sense_command_invalid(void)
 }
 
 
-//---------------------------------------------
+// ------------------------
 //------- Routines manage SCSI Commands
 
 static void udi_msc_spc_requestsense(void)
diff --git a/Marlin/src/HAL/HAL_DUE/usb/uotghs_device_due.c b/Marlin/src/HAL/HAL_DUE/usb/uotghs_device_due.c
index c714f1065..9bac29276 100644
--- a/Marlin/src/HAL/HAL_DUE/usb/uotghs_device_due.c
+++ b/Marlin/src/HAL/HAL_DUE/usb/uotghs_device_due.c
@@ -506,7 +506,7 @@ static bool udd_ep_interrupt(void);
 //@}
 
 
-//--------------------------------------------------------
+// ------------------------
 //--- INTERNAL ROUTINES TO MANAGED GLOBAL EVENTS
 
 /**
@@ -1307,7 +1307,7 @@ void udd_test_mode_packet(void)
 
 
 
-//--------------------------------------------------------
+// ------------------------
 //--- INTERNAL ROUTINES TO MANAGED THE CONTROL ENDPOINT
 
 static void udd_reset_ep_ctrl(void)
@@ -1729,7 +1729,7 @@ static bool udd_ctrl_interrupt(void)
 }
 
 
-//--------------------------------------------------------
+// ------------------------
 //--- INTERNAL ROUTINES TO MANAGED THE BULK/INTERRUPT/ISOCHRONOUS ENDPOINTS
 
 #if (0 != USB_DEVICE_MAX_EP)
diff --git a/Marlin/src/HAL/HAL_ESP32/HAL.cpp b/Marlin/src/HAL/HAL_ESP32/HAL.cpp
index ef59b6f12..535e3b326 100644
--- a/Marlin/src/HAL/HAL_ESP32/HAL.cpp
+++ b/Marlin/src/HAL/HAL_ESP32/HAL.cpp
@@ -46,7 +46,7 @@
 #endif
 
 // ------------------------
-// Externals
+// Externs
 // ------------------------
 
 portMUX_TYPE spinlock = portMUX_INITIALIZER_UNLOCKED;
@@ -177,6 +177,7 @@ void HAL_adc_init() {
   // Calculate ADC characteristics (i.e., gain and offset factors for each attenuation level)
   for (int i = 0; i < ADC_ATTEN_MAX; i++) {
     esp_adc_cal_characterize(ADC_UNIT_1, (adc_atten_t)i, ADC_WIDTH_BIT_12, V_REF, &characteristics[i]);
+
     // Change attenuation 100mV below the calibrated threshold
     thresholds[i] = esp_adc_cal_raw_to_voltage(4095, &characteristics[i]);
   }