pbsys/program_stop: Add getter for stop buttons.

This lets us restore a previously set value from user code.

Author: laurensvalk

lib/pbio/include/pbsys/program_stop.h

@@ -17,6 +17,7 @@
 
 #if PBSYS_CONFIG_PROGRAM_STOP
 
+pbio_button_flags_t pbsys_program_stop_get_buttons(void);
 void pbsys_program_stop_set_buttons(pbio_button_flags_t buttons);
 
 #else // PBSYS_CONFIG_PROGRAM_STOP

lib/pbio/sys/program_stop.c

@@ -42,6 +42,15 @@ void pbsys_program_stop(bool force_stop) {
     }
 }
 
+/**
+ * Gets the stop button(s) used during a user program.
+ * @param [in]  buttons     One or more button flags that stop the program
+ *                          or 0 if stopping by button is disabled.
+ */
+pbio_button_flags_t pbsys_program_stop_get_buttons(void) {
+    return stop_buttons;
+}
+
 /**
  * Sets the stop button(s) to be used during a user program.
  * @param [in]  buttons     One or more button flags to set the stop button