Implement a simple transition counter script.

diff --git a/scripts/transitioncounter.py b/scripts/transitioncounter.py
index ba799ec1fcf5fdef290625514f8bc736bf02dddd..cbf80680704aedfc0d53be61e363b30839047270 100644 (file)
--- a/scripts/transitioncounter.py
+++ b/scripts/transitioncounter.py
@@ -18,20 +18,55 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 ##
 
-# FIXME: So far this is just a simple test for the Python embedding code.
 def sigrokdecode_count_transitions(inbuf):
        """Counts the low->high and high->low transitions in the specified
           channel(s) of the signal."""
 
-       outbuf = 'AB' # FIXME
+       outbuf = ''
+
+       # TODO: Don't hardcode the number of channels.
+       channels = 8
+
+       oldbit = [0] * channels
+       transitions = [0] * channels
+       rising = [0] * channels
+       falling = [0] * channels
 
        # print len(inbuf)
        # print type(inbuf)
 
-       # print inbuf
-       # print str(inbuf[0])
-       # print str(inbuf[1])
+       # Presets...
+       s = ord(inbuf[0])
+       for i in xrange(channels):
+               curbit = (s & (1 << i) != 0)
+               oldbit[i] = curbit
+
+       # Loop over all samples.
+       # TODO: Handle LAs with more/less than 8 channels.
+       for s in inbuf:
+               s = ord(s) # FIXME
+               for i in xrange(channels):
+                       curbit = (s & (1 << i) != 0)
+                       if (oldbit[i] == 0 and curbit == 1):
+                               rising[i] += 1
+                       elif (oldbit[i] == 1 and curbit == 0):
+                               falling[i] += 1
+                       oldbit[i] = curbit
+
+       # Total number of transitions is the sum of rising and falling edges.
+       for i in xrange(channels):
+               transitions[i] = rising[i] + falling[i]
+
+       outbuf += "Rising edges:  "
+       for i in xrange(channels):
+               outbuf += str(rising[i]) + " "
+       outbuf += "\nFalling edges: "
+       for i in xrange(channels):
+               outbuf += str(falling[i]) + " "
+       outbuf += "\nTransitions:   "
+       for i in xrange(channels):
+               outbuf += str(transitions[i]) + " "
+       outbuf += "\n"
 
-       # return inbuf
        return outbuf