can: Drop an unused method.

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

diff --git a/decoders/can/pd.py b/decoders/can/pd.py
index 0b001278a1905e9f27042d168e9a43fc2026645a..5d45c56d59e709243c545699708bd50a19d11791 100644 (file)
--- a/decoders/can/pd.py
+++ b/decoders/can/pd.py
@@ -80,6 +80,16 @@ class Decoder(srd.Decoder):
     def start(self):
         self.out_ann = self.register(srd.OUTPUT_ANN)
 
+    def set_bit_rate(self, bitrate):
+        self.bit_width = float(self.samplerate) / float(bitrate)
+        self.sample_point = (self.bit_width / 100.0) * self.options['sample_point']
+
+    def set_nominal_bitrate(self):
+        self.set_bit_rate(self.options['nominal_bitrate'])
+
+    def set_fast_bitrate(self):
+        self.set_bit_rate(self.options['fast_bitrate'])
+
     def metadata(self, key, value):
         if key == srd.SRD_CONF_SAMPLERATE:
             self.samplerate = value
@@ -130,16 +140,12 @@ class Decoder(srd.Decoder):
         self.dom_edge_snum = self.samplenum
         self.dom_edge_bcount = self.curbit
 
-    def bit_sampled(self):
-        # EMPTY
-        pass
-
     # Determine the position of the next desired bit's sample point.
     def get_sample_point(self, bitnum):
         samplenum = self.dom_edge_snum
-        samplenum += int(self.bit_width * (bitnum - self.dom_edge_bcount))
-        samplenum += int(self.sample_point)
-        return samplenum
+        samplenum += self.bit_width * (bitnum - self.dom_edge_bcount)
+        samplenum += self.sample_point
+        return int(samplenum)
 
     def is_stuff_bit(self):
         # CAN uses NRZ encoding and bit stuffing.
@@ -188,7 +194,7 @@ class Decoder(srd.Decoder):
                 else:
                     crc_type = "CRC-21"
             else:
-                crc_type = "CRC" # TODO: CRC-15 (will break existing tests)
+                crc_type = "CRC-15"
 
             x = self.last_databit + 1
             crc_bits = self.bits[x:x + self.crc_len + 1]
@@ -205,6 +211,9 @@ class Decoder(srd.Decoder):
             if can_rx != 1:
                 self.putx([16, ['CRC delimiter must be a recessive bit']])
 
+            if self.fd:
+                self.set_nominal_bitrate()
+
         # ACK slot bit (dominant: ACK, recessive: NACK)
         elif bitnum == (self.last_databit + self.crc_len + 2):
             ack = 'ACK' if can_rx == 0 else 'NACK'
@@ -408,6 +417,12 @@ class Decoder(srd.Decoder):
         # Get the index of the current CAN frame bit (without stuff bits).
         bitnum = len(self.bits) - 1
 
+        if self.fd and can_rx:
+            if bitnum == 16 and self.frame_type == 'standard' \
+                    or bitnum == 35 and self.frame_type == 'extended':
+                self.dom_edge_seen(force=True)
+                self.set_fast_bitrate()
+
         # If this is a stuff bit, remove it from self.bits and ignore it.
         if self.is_stuff_bit():
             self.putx([15, [str(can_rx)]])
@@ -483,4 +498,3 @@ class Decoder(srd.Decoder):
                     self.dom_edge_seen()
                 if self.matched[0]:
                     self.handle_bit(can_rx)
-                    self.bit_sampled()