uart: rephrase data bits to data value conversion

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

diff --git a/decoders/uart/pd.py b/decoders/uart/pd.py
index 16729cc48fd5837a51e4a377e69b20ef9317e704..6c3d85cf9b06c9f30db1d59c33aeab85b9ecb631 100644 (file)
--- a/decoders/uart/pd.py
+++ b/decoders/uart/pd.py
@@ -18,6 +18,7 @@
 ##
 
 import sigrokdecode as srd
+from common.srdhelper import bitpack
 from math import floor, ceil
 
 '''
@@ -160,6 +161,9 @@ class Decoder(srd.Decoder):
         self.put(s - floor(halfbit), self.samplenum + ceil(halfbit), self.out_binary, data)
 
     def __init__(self):
+        self.reset()
+
+    def reset(self):
         self.samplerate = None
         self.samplenum = 0
         self.frame_start = [-1, -1]
@@ -226,15 +230,6 @@ class Decoder(srd.Decoder):
         if self.startsample[rxtx] == -1:
             self.startsample[rxtx] = self.samplenum
 
-        # Get the next data bit in LSB-first or MSB-first fashion.
-        if self.options['bit_order'] == 'lsb-first':
-            self.datavalue[rxtx] >>= 1
-            self.datavalue[rxtx] |= \
-                (signal << (self.options['num_data_bits'] - 1))
-        else:
-            self.datavalue[rxtx] <<= 1
-            self.datavalue[rxtx] |= (signal << 0)
-
         self.putg([rxtx + 12, ['%d' % signal]])
 
         # Store individual data bits and their start/end samplenumbers.
@@ -246,6 +241,11 @@ class Decoder(srd.Decoder):
         if self.cur_data_bit[rxtx] < self.options['num_data_bits']:
             return
 
+        # Convert accumulated data bits to a data value.
+        bits = [b[0] for b in self.databits[rxtx]]
+        if self.options['bit_order'] == 'msb-first':
+            bits.reverse()
+        self.datavalue[rxtx] = bitpack(bits)
         self.putpx(rxtx, ['DATA', rxtx,
             (self.datavalue[rxtx], self.databits[rxtx])])