counter: move some init code to the start of decode()

[libsigrokdecode.git] / decoders / counter / pd.py

diff --git a/decoders/counter/pd.py b/decoders/counter/pd.py
index a02876518ec21f29b1b536d9086059ec1dd79042..384f978f536b5af2ed3ee10eeb8a8bdc47b45f26 100644 (file)
--- a/decoders/counter/pd.py
+++ b/decoders/counter/pd.py
@@ -19,6 +19,9 @@
 
 import sigrokdecode as srd
 
+(PIN_DATA, PIN_RESET) = range(2)
+(ROW_EDGE, ROW_WORD, ROW_RESET) = range(3)
+
 class Decoder(srd.Decoder):
     api_version = 3
     id = 'counter'
@@ -40,22 +43,23 @@ class Decoder(srd.Decoder):
         ('word_reset', 'Word reset'),
     )
     annotation_rows = (
-        ('edge_counts', 'Edges', (0,)),
-        ('word_counts', 'Words', (1,)),
-        ('word_resets', 'Word resets', (2,)),
+        ('edge_counts', 'Edges', (ROW_EDGE,)),
+        ('word_counts', 'Words', (ROW_WORD,)),
+        ('word_resets', 'Word resets', (ROW_RESET,)),
     )
     options = (
-        {'id': 'edge', 'desc': 'Edges to check', 'default': 'any', 'values': ('any', 'rising', 'falling')},
+        {'id': 'data_edge', 'desc': 'Edges to count (data)', 'default': 'any',
+            'values': ('any', 'rising', 'falling')},
         {'id': 'divider', 'desc': 'Count divider (word width)', 'default': 0},
+        {'id': 'reset_edge', 'desc': 'Edge which clears counters (reset)',
+            'default': 'falling', 'values': ('rising', 'falling')},
     )
 
     def __init__(self):
         self.reset()
 
     def reset(self):
-        self.edge_count = 0
-        self.word_count = 0
-        self.have_reset = None
+        pass
 
     def metadata(self, key, value):
         if key == srd.SRD_CONF_SAMPLERATE:
@@ -63,34 +67,38 @@ class Decoder(srd.Decoder):
 
     def start(self):
         self.out_ann = self.register(srd.OUTPUT_ANN)
-        self.edge = self.options['edge']
-        self.divider = self.options['divider']
-        if self.divider < 0:
-            self.divider = 0
 
     def putc(self, cls, annlist):
         self.put(self.samplenum, self.samplenum, self.out_ann, [cls, annlist])
 
     def decode(self):
-        condition = [{'rising':  {0: 'r'},
-                      'falling': {0: 'f'},
-                      'any':     {0: 'e'},}[self.edge]]
+        opt_edge_map = {'rising': 'r', 'falling': 'f', 'any': 'e'}
 
-        if self.has_channel(1):
-            self.have_reset = True
-            condition.append({1: 'f'})
+        self.edge = self.options['data_edge']
+        self.divider = self.options['divider']
+        if self.divider < 0:
+            self.divider = 0
+
+        condition = [{PIN_DATA: opt_edge_map[self.edge]}]
+        self.have_reset = self.has_channel(PIN_RESET)
+        if self.have_reset:
+            cond_reset = len(condition)
+            condition.append({PIN_RESET: opt_edge_map[self.options['reset_edge']]})
 
+        self.edge_count = 0
+        self.word_count = 0
         while True:
             self.wait(condition)
-            if self.have_reset and self.matched[1]:
+
+            if self.have_reset and self.matched[cond_reset]:
                 self.edge_count = 0
                 self.word_count = 0
-                self.putc(2, ['Word reset', 'Reset', 'Rst', 'R'])
+                self.putc(ROW_RESET, ['Word reset', 'Reset', 'Rst', 'R'])
                 continue
 
             self.edge_count += 1
+            self.putc(ROW_EDGE, [str(self.edge_count)])
 
-            self.putc(0, [str(self.edge_count)])
             if self.divider > 0 and (self.edge_count % self.divider) == 0:
                 self.word_count += 1
-                self.putc(1, [str(self.word_count)])
+                self.putc(ROW_WORD, [str(self.word_count)])