mcu: Provide some further help on common MCU shutdown errors

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/adccmds.c

@@ -43,7 +43,7 @@ analog_in_event(struct timer *timer)
         return SF_RESCHEDULE;
     }
     if (a->value < a->min_value || a->value > a->max_value)
-        shutdown("adc out of range");
+        shutdown("ADC out of range");
     sched_wake_task(&analog_wake);
     a->next_begin_time += a->rest_time;
     a->timer.waketime = a->next_begin_time;

src/basecmd.c

@@ -297,7 +297,7 @@ stats_update(uint32_t start, uint32_t cur)
 void
 command_emergency_stop(uint32_t *args)
 {
-    shutdown("command request");
+    shutdown("Command request");
 }
 DECL_COMMAND_FLAGS(command_emergency_stop, HF_IN_SHUTDOWN, "emergency_stop");
 

src/stepper.c

@@ -79,7 +79,7 @@ stepper_load_next(struct stepper *s, uint32_t min_next_time)
         if (unlikely(timer_is_before(s->next_step_time, min_next_time))) {
             if ((int32_t)(s->next_step_time - min_next_time)
                 < (int32_t)(-timer_from_us(1000)))
-                shutdown("stepper too far in past");
+                shutdown("Stepper too far in past");
             s->time.waketime = min_next_time;
         } else {
             s->time.waketime = s->next_step_time;