Fix FAST_PWM_FAN / TouchUI with NO_MOTION_BEFORE_HOMING (MarlinFirmware#25005)

Fix regressions from MarlinFirmware#20323, MarlinFirmware#23463

Author: marciot

Marlin/src/HAL/AVR/fast_pwm.cpp

@@ -146,11 +146,11 @@ void MarlinHAL::set_pwm_frequency(const pin_t pin, const uint16_t f_desired) {
       LIMIT(res_pc_temp, 1U, maxtop);
 
       // Calculate frequencies of test prescaler and resolution values
-      const uint32_t f_diff      = _MAX(f, f_desired) - _MIN(f, f_desired),
-                     f_fast_temp = (F_CPU) / (p * (1 + res_fast_temp)),
-                     f_fast_diff = _MAX(f_fast_temp, f_desired) - _MIN(f_fast_temp, f_desired),
-                     f_pc_temp   = (F_CPU) / (2 * p * res_pc_temp),
-                     f_pc_diff   = _MAX(f_pc_temp, f_desired) - _MIN(f_pc_temp, f_desired);
+      const int f_diff = ABS(f - int(f_desired)),
+                f_fast_temp = (F_CPU) / (p * (1 + res_fast_temp)),
+                f_fast_diff = ABS(f_fast_temp - int(f_desired)),
+                f_pc_temp = (F_CPU) / (2 * p * res_pc_temp),
+                f_pc_diff = ABS(f_pc_temp - int(f_desired));
 
       if (f_fast_diff < f_diff && f_fast_diff <= f_pc_diff) { // FAST values are closest to desired f
         // Set the Wave Generation Mode to FAST PWM

Marlin/src/lcd/extui/ui_api.cpp

@@ -375,9 +375,9 @@ namespace ExtUI {
   bool canMove(const axis_t axis) {
     switch (axis) {
       #if IS_KINEMATIC || ENABLED(NO_MOTION_BEFORE_HOMING)
-        case X: return axis_should_home(X_AXIS);
-        OPTCODE(HAS_Y_AXIS, case Y: return axis_should_home(Y_AXIS))
-        OPTCODE(HAS_Z_AXIS, case Z: return axis_should_home(Z_AXIS))
+        case X: return !axis_should_home(X_AXIS);
+        OPTCODE(HAS_Y_AXIS, case Y: return !axis_should_home(Y_AXIS))
+        OPTCODE(HAS_Z_AXIS, case Z: return !axis_should_home(Z_AXIS))
       #else
         case X: case Y: case Z: return true;
       #endif