✨ EXPERIMENTAL_I2S_LA

MarlinFirmware/Marlin#24684
MarlinFirmware · Sep 1, 2022 · d6b5e80 · d6b5e80
1 parent b21bb45
commit d6b5e80
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diff --git a/config/default/Configuration_adv.h b/config/default/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/3DFabXYZ/Migbot/Configuration_adv.h b/config/examples/3DFabXYZ/Migbot/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/ADIMLab/Gantry v1/Configuration_adv.h b/config/examples/ADIMLab/Gantry v1/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/ADIMLab/Gantry v2/Configuration_adv.h b/config/examples/ADIMLab/Gantry v2/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Alfawise/U20-bltouch/Configuration_adv.h b/config/examples/Alfawise/U20-bltouch/Configuration_adv.h
@@ -2082,11 +2082,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Alfawise/U20/Configuration_adv.h b/config/examples/Alfawise/U20/Configuration_adv.h
@@ -2073,11 +2073,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/AliExpress/UM2pExt/Configuration_adv.h b/config/examples/AliExpress/UM2pExt/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/A2/Configuration_adv.h b/config/examples/Anet/A2/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/A2plus/Configuration_adv.h b/config/examples/Anet/A2plus/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/A6/Configuration_adv.h b/config/examples/Anet/A6/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/A8/Configuration_adv.h b/config/examples/Anet/A8/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/A8plus/Configuration_adv.h b/config/examples/Anet/A8plus/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/A9/Configuration_adv.h b/config/examples/Anet/A9/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/E10/Configuration_adv.h b/config/examples/Anet/E10/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/E16/BTT SKR 1.3/Configuration_adv.h b/config/examples/Anet/E16/BTT SKR 1.3/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/E16/Stock/Configuration_adv.h b/config/examples/Anet/E16/Stock/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/ET4+/Configuration_adv.h b/config/examples/Anet/ET4+/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/ET4-Pro/Configuration_adv.h b/config/examples/Anet/ET4-Pro/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/ET4/Configuration_adv.h b/config/examples/Anet/ET4/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling

diff --git a/config/examples/Anet/ET4X/Configuration_adv.h b/config/examples/Anet/ET4X/Configuration_adv.h
@@ -2072,11 +2072,12 @@
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
-  //#define EXTRA_LIN_ADVANCE_K // Enable for second linear advance constants
+  //#define EXTRA_LIN_ADVANCE_K // Add a second linear advance constant, configurable with M900.
   #define LIN_ADVANCE_K 0.22    // Unit: mm compression per 1mm/s extruder speed
-  //#define LA_DEBUG            // If enabled, this will generate debug information output over USB.
-  //#define EXPERIMENTAL_SCURVE // Enable this option to permit S-Curve Acceleration
+  //#define LA_DEBUG            // Print debug information to serial during operation. Disable for production use.
+  //#define EXPERIMENTAL_SCURVE // Allow S-Curve Acceleration to be used with LA.
   //#define ALLOW_LOW_EJERK     // Allow a DEFAULT_EJERK value of <10. Recommended for direct drive hotends.
+  //#define EXPERIMENTAL_I2S_LA // Allow I2S_STEPPER_STREAM to be used with LA. Performance degrades as the LA step rate reaches ~20kHz.
 #endif
 
 // @section leveling