diff --git a/klippy/extras/tmc2130.py b/klippy/extras/tmc2130.py
index d9ae5957..a49d55df 100644
--- a/klippy/extras/tmc2130.py
+++ b/klippy/extras/tmc2130.py
@@ -35,9 +35,16 @@ Fields = {}
 def ffs(mask):
     return (mask & -mask).bit_length() - 1
 
+# Decode two's complement signed integer
+def decode_signed_int(val, bits):
+    if ((val >> (bits - 1)) & 1):
+        return val - (1 << bits)
+    return val
+
 class FieldHelper:
-    def __init__(self, all_fields):
+    def __init__(self, all_fields, field_formatters={}):
         self.all_fields = all_fields
+        self.field_formatters = field_formatters
     def get_field(self, reg_name, field_name, reg_value):
         # Returns value of the register field
         mask = self.all_fields.get(reg_name, {})[field_name]
@@ -48,11 +55,15 @@ class FieldHelper:
         return (reg_value & ~mask) | ((field_value << ffs(mask)) & mask)
     def pretty_format(self, reg_name, value):
         # Provide a string description of a register
-        fields = [ " %s=%d" % (field_name, (value & mask) >> ffs(mask))
-                   for field_name, mask in sorted(self.all_fields.get(
-                       reg_name, {}).items(), key = lambda f: f[1])
-                   if value & mask ]
-        return "%-15s %08x%s" % (reg_name + ":", value, "".join(fields))
+        reg_fields = self.all_fields.get(reg_name, {})
+        reg_fields = sorted([(mask, name) for name, mask in reg_fields.items()])
+        fields = []
+        for mask, field_name in reg_fields:
+            fval = (value & mask) >> ffs(mask)
+            sval = self.field_formatters.get(field_name, str)(fval)
+            if sval and sval != "0":
+                fields.append(" %s=%s" % (field_name, sval))
+        return "%-11s %08x%s" % (reg_name + ":", value, "".join(fields))
 
 
 ######################################################################
diff --git a/klippy/extras/tmc2208.py b/klippy/extras/tmc2208.py
index ec462855..643710e1 100644
--- a/klippy/extras/tmc2208.py
+++ b/klippy/extras/tmc2208.py
@@ -171,6 +171,28 @@ Fields["PWM_AUTO"] = {
     "PWM_GRAD_AUTO":       0xff << 16
 }
 
+FieldFormatters = {
+    "I_scale_analog":   (lambda v: "1(ExtVREF)" if v else ""),
+    "shaft":            (lambda v: "1(Reverse)" if v else ""),
+    "drv_err":          (lambda v: "1(ErrorShutdown!)" if v else ""),
+    "uv_cp":            (lambda v: "1(Undervoltage!)" if v else ""),
+    "SEL_A":            (lambda v: "%d(%s)" % (v, ["TMC222x", "TMC220x"][v])),
+    "VERSION":          (lambda v: "%#x" % v),
+    "CUR_A":            (lambda v: str(tmc2130.decode_signed_int(v, 9))),
+    "CUR_B":            (lambda v: str(tmc2130.decode_signed_int(v, 9))),
+    "MRES":             (lambda v: "%d(%dusteps)" % (v, 0x100 >> v)),
+    "otpw":             (lambda v: "1(OvertempWarning!)" if v else ""),
+    "ot":               (lambda v: "1(OvertempError!)" if v else ""),
+    "s2ga":             (lambda v: "1(ShortToGND_A!)" if v else ""),
+    "s2gb":             (lambda v: "1(ShortToGND_B!)" if v else ""),
+    "s2vsa":            (lambda v: "1(LowSideShort_A!)" if v else ""),
+    "s2vsb":            (lambda v: "1(LowSideShort_B!)" if v else ""),
+    "ola":              (lambda v: "1(OpenLoad_A!)" if v else ""),
+    "olb":              (lambda v: "1(OpenLoad_B!)" if v else ""),
+    "PWM_SCALE_AUTO":   (lambda v: str(tmc2130.decode_signed_int(v, 9)))
+}
+
+
 ######################################################################
 # TMC2208 communication
 ######################################################################
@@ -267,7 +289,7 @@ class TMC2208:
             "DUMP_TMC", "STEPPER", self.name,
             self.cmd_DUMP_TMC, desc=self.cmd_DUMP_TMC_help)
         # Get config for initial driver settings
-        self.field_helper = tmc2130.FieldHelper(Fields)
+        self.field_helper = tmc2130.FieldHelper(Fields, FieldFormatters)
         run_current = config.getfloat('run_current', above=0., maxval=2.)
         hold_current = config.getfloat('hold_current', run_current,
                                        above=0., maxval=2.)