Fix for regression causing MPG mode switch malfunction. Ref. issue #846.

Author: terjeio

README.md

@@ -1,6 +1,6 @@
 ## grblHAL ##
 
-Latest build date is 20251108, see the [changelog](changelog.md) for details.  
+Latest build date is 20251109, see the [changelog](changelog.md) for details.  
 
 > [!NOTE]
 >  A settings reset will be performed on an update of builds prior to 20241208. Backup and restore of settings is recommended.  
@@ -89,4 +89,4 @@ G/M-codes not supported by [legacy Grbl](https://github.com/gnea/grbl/wiki) are
 Some [plugins](https://github.com/grblHAL/plugins) implements additional M-codes.
 
 ---
-20250928
+20251109

changelog.md

@@ -1,5 +1,13 @@
 ## grblHAL changelog
 
+<a name="20251109">Build 20251109
+
+Core:
+
+* Fix for regression causing MPG mode switch malfunction. Ref. issue [#846](https://github.com/grblHAL/core/issues/846).
+
+---
+
 <a name="20251108">Build 20251108
 
 Core:

grbl.h

@@ -42,7 +42,7 @@
 #else
 #define GRBL_VERSION "1.1f"
 #endif
-#define GRBL_BUILD 20251108
+#define GRBL_BUILD 20251109
 
 #define GRBL_URL "https://github.com/grblHAL"
 

pin_bits_masks.h

@@ -155,7 +155,7 @@ static aux_ctrl_t aux_ctrl[] = {
     add_aux_input(Input_I2CStrobe, I2C_STROBE, IRQ_Mode_Change, 0)
 #endif
 #if MPG_ENABLE == 1 && defined(MPG_MODE_PIN)
-    add_aux_input(Input_MPGSelect, MPG_MODE, IRQ_Mode_RisingFalling, 0)
+    add_aux_input(Input_MPGSelect, MPG_MODE, IRQ_Mode_Change, 0)
 #endif
 #if QEI_SELECT_ENABLE && defined(QEI_SELECT_PIN)
     add_aux_input(Input_QEI_Select, QEI_SELECT, IRQ_Mode_RisingFalling, 0)
@@ -182,7 +182,7 @@ static aux_ctrl_t aux_ctrl[] = {
     add_aux_input_scan(Input_ToolsetterOvertravel, IRQ_Mode_Change, SIGNALS_TLS_OVERTRAVEL_BIT)
 #endif
 #if LIMITS_OVERRIDE_ENABLE
-    add_aux_input_scan(Input_LimitsOverride, IRQ_Mode_Change, SIGNALS_LIMITS_OVERRIDE_BIT)
+    add_aux_input_scan(Input_LimitsOverride, IRQ_Mode_None, SIGNALS_LIMITS_OVERRIDE_BIT)
 #endif
 #if STOP_DISABLE_ENABLE
     add_aux_input_scan(Input_StopDisable, IRQ_Mode_Change, SIGNALS_STOPDISABLE_BIT)