diff --git a/changelog.md b/changelog.md
index 4d4c981..0a216fc 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,23 @@
 ## grblHAL changelog
 
+<a name="20241204"> 20241204
+
+Core:
+
+* Changed deprecated calls to `isinff()` and `isnanf()` to new \(C99\) versions.
+
+Drivers:
+
+* RP2040: CMakeLists.txt fixes for RP2350 builds.
+
+* STM32F4xx: disabled broken support for sensorless homing for LongBoard32 \(SLB\). Support for this board is still WIP.
+
+Plugins:
+
+* Motors , spindle and misc: Changed deprecated calls to `isinff()` and `isnanf()` to new \(C99\) versions.
+
+---
+
 <a name="20241128">Build 20241128
 
 Core:
@@ -20,7 +38,7 @@ Drivers:
 
 Plugins:
 
-* Trinamic: removed superfluous semicolon.Ref. [issue #15](https://github.com/grblHAL/Plugins_motor/issues/15).
+* Trinamic: removed superfluous semicolon. Ref. [issue #15](https://github.com/grblHAL/Plugins_motor/issues/15).
 
 * Networking: added some files to _CMakeLists.txt_, used by RP2350 driver.
 
diff --git a/gcode.c b/gcode.c
index b99d140..66e9713 100644
--- a/gcode.c
+++ b/gcode.c
@@ -940,7 +940,7 @@ status_code_t gc_execute_block (char *block)
         if(gc_state.skip_blocks && letter != 'O')
             return Status_OK;
 
-        if(user_mcode != UserMCode_NoValueWords && isnanf(value))
+        if(user_mcode != UserMCode_NoValueWords && isnan(value))
             FAIL(Status_BadNumberFormat);   // [Expected word value]
 
         g65_words.value = 0;
@@ -969,7 +969,7 @@ status_code_t gc_execute_block (char *block)
         // a good enough compromise and catch most all non-integer errors. To make it compliant,
         // we would simply need to change the mantissa to int16, but this add compiled flash space.
         // Maybe update this later.
-        if(!isnanf(value)) {
+        if(!isnan(value)) {
             int_value = (uint32_t)truncf(value);
             mantissa = (uint_fast16_t)roundf(100.0f * (value - int_value));
         }
@@ -2600,7 +2600,7 @@ status_code_t gc_execute_block (char *block)
                     // TODO: fail?
                 }
 
-                if(thread.end_taper_type != Taper_None && thread.end_taper_length > abs(thread.z_final - gc_state.position[Z_AXIS]) / 2.0f)
+                if(thread.end_taper_type != Taper_None && thread.end_taper_length > fabsf(thread.z_final - gc_state.position[Z_AXIS]) / 2.0f)
                     FAIL(Status_GcodeValueOutOfRange);
 
                 if(gc_block.words.r)
diff --git a/kinematics/delta.c b/kinematics/delta.c
index 945d2b5..44221c3 100644
--- a/kinematics/delta.c
+++ b/kinematics/delta.c
@@ -322,7 +322,7 @@ static void get_cuboid_envelope (void)
     for(z = 0; z < settings.axis[X_AXIS].steps_per_mm * 2.0f * M_PI ; ++z) {
         pos[0] = pos[1] = pos[2] = sr * (float)z;
         transform_to_cartesian(mpos.values, pos);
-        if(!isnanf(mpos.x)) {
+        if(!isnan(mpos.x)) {
             if(minz > mpos.z)
                 minz = mpos.z;
             if(maxz < mpos.z)
@@ -589,7 +589,7 @@ static bool delta_check_travel_limits (float *target, axes_signals_t axes, bool
 #endif
 
     if(!is_cartesian) {
-        if(isnanf(transform_to_cartesian(pos.values, target)[A_MOTOR]))
+        if(isnan(transform_to_cartesian(pos.values, target)[A_MOTOR]))
             return false;
     }
 
diff --git a/ngc_expr.c b/ngc_expr.c
index 39bc6c6..7eb136b 100644
--- a/ngc_expr.c
+++ b/ngc_expr.c
@@ -820,9 +820,9 @@ status_code_t ngc_read_real_value (char *line, uint_fast8_t *pos, float *value)
     else
         status = (read_float(line, pos, value) ? Status_OK : Status_BadNumberFormat);
 
-    if(isnanf(*value))
+    if(isnan(*value))
         status = Status_ExpressionInvalidResult; // Calculation resulted in 'not a number'
-    else if(isinff(*value))
+    else if(isinf(*value))
         status = Status_ExpressionInvalidResult; // Calculation resulted in 'not a number'
 
     return status;
diff --git a/nuts_bolts.c b/nuts_bolts.c
index 87f1414..bb8c9b1 100644
--- a/nuts_bolts.c
+++ b/nuts_bolts.c
@@ -306,7 +306,7 @@ bool read_float (char *line, uint_fast8_t *char_counter, float *float_ptr)
 // Returns true if float value is a whole number (integer)
 bool isintf (float value)
 {
-    return !isnanf(value) && fabsf(value - truncf(value)) < 0.001f;
+    return !isnan(value) && fabsf(value - truncf(value)) < 0.001f;
 }
 
 // Non-blocking delay function used for general operation and suspend features.
diff --git a/nuts_bolts.h b/nuts_bolts.h
index ec5b8ba..4e2ff40 100644
--- a/nuts_bolts.h
+++ b/nuts_bolts.h
@@ -64,11 +64,6 @@
 #endif
 #endif
 
-#if defined(__MSP430F5529__) || defined(__MSP432P401R__) || defined(__MSP432E401Y__) || defined(PART_TM4C123GH6PM) ||  defined(PART_TM4C1294NCPDT)
-#define isnanf(x) __isnanf(x)
-#define isinff(x) __isinff(x)
-#endif
-
 // Axis array index values. Must start with 0 and be continuous.
 #define X_AXIS 0 // Axis indexing value.
 #define Y_AXIS 1