X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=decoders%2Fspi.py;h=44d07c260f64bf19d057dc2fac42533d42e91d2d;hb=9b4d8a5753db586648abfe7897c29ad5d5bc77a5;hp=383206b1914a6069e642f435516b594d575d9304;hpb=e100d51ec0909db8f93c837ea1fd92a08461b781;p=libsigrokdecode.git

diff --git a/decoders/spi.py b/decoders/spi.py
index 383206b..44d07c2 100644
--- a/decoders/spi.py
+++ b/decoders/spi.py
@@ -2,6 +2,7 @@
 ## This file is part of the sigrok project.
 ##
 ## Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
+## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
 ##
 ## This program is free software; you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -18,97 +19,93 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 ##
 
-class Sample():
-    def __init__(self, data):
-        self.data = data
-    def probe(self, probe):
-        s = ord(self.data[probe / 8]) & (1 << (probe % 8))
-        return True if s else False
+import sigrokdecode as srd
 
-def sampleiter(data, unitsize):
-    for i in range(0, len(data), unitsize):
-        yield(Sample(data[i:i+unitsize]))
+# Annotation formats
+ANN_HEX = 0
 
-class Decoder():
-    name = 'SPI Decoder'
+class Decoder(srd.Decoder):
+    id = 'spi'
+    name = 'SPI'
+    longname = 'Serial Peripheral Interface (SPI) bus'
     desc = '...desc...'
-    longname = '...longname...'
     longdesc = '...longdesc...'
     author = 'Gareth McMullin'
     email = 'gareth@blacksphere.co.nz'
     license = 'gplv2+'
     inputs = ['logic']
     outputs = ['spi']
-    # Probe names with a set of defaults
-    probes = {'sdata':0, 'sck':1}
+    probes = [
+        {'id': 'mosi', 'name': 'MOSI',
+         'desc': 'SPI MOSI line (Master out, slave in)'},
+        {'id': 'miso', 'name': 'MISO',
+         'desc': 'SPI MISO line (Master in, slave out)'},
+        {'id': 'sck', 'name': 'CLK', 'desc': 'SPI clock line'},
+        {'id': 'cs', 'name': 'CS#', 'desc': 'SPI CS (chip select) line'},
+    ]
     options = {}
+    annotations = [
+        ['Hex', 'SPI data bytes in hex format'],
+    ]
 
     def __init__(self):
-        self.probes = Decoder.probes.copy()
-        self.oldsck = True
-        self.rxcount = 0
-        self.rxdata = 0
+        self.oldsck = 1
+        self.bitcount = 0
+        self.mosidata = 0
+        self.misodata = 0
         self.bytesreceived = 0
+        self.samplenum = -1
 
     def start(self, metadata):
-        self.unitsize = metadata['unitsize']
+        self.out_proto = self.add(srd.OUTPUT_PROTO, 'spi')
+        self.out_ann = self.add(srd.OUTPUT_ANN, 'spi')
 
     def report(self):
         return 'SPI: %d bytes received' % self.bytesreceived
 
-    def decode(self, data):
-        # We should accept a list of samples and iterate...
-        for sample in sampleiter(data['data'], self.unitsize):
+    def decode(self, ss, es, data):
+        # HACK! At the moment the number of probes is not handled correctly.
+        # E.g. if an input file (-i foo.sr) has more than two probes enabled.
+        # for (samplenum, (mosi, sck, x, y, z, a)) in data:
+        # for (samplenum, (cs, miso, sck, mosi, wp, hold)) in data:
+        for (samplenum, (cs, miso, sck, mosi, wp, hold)) in data:
 
-            sck = sample.probe(self.probes['sck'])
-            # Sample SDATA on rising SCK
+            self.samplenum += 1 # FIXME
+
+            # Sample data on rising SCK edges.
             if sck == self.oldsck:
                 continue
             self.oldsck = sck
-            if not sck:
+            if sck == 0:
                 continue
 
-            # If this is first bit, save timestamp
-            if self.rxcount == 0:
-                self.time = data['time']
-            # Receive bit into our shift register
-            sdata = sample.probe(self.probes['sdata'])
-            if sdata:
-                self.rxdata |= 1 << (7 - self.rxcount)
-            self.rxcount += 1
-            # Continue to receive if not a byte yet
-            if self.rxcount != 8:
-                continue
-            # Received a byte, pass up to sigrok
-            outdata = {'time':self.time,
-                'duration':data['time'] + data['duration'] - self.time,
-                'data':self.rxdata,
-                'display':('%02X' % self.rxdata),
-                'type':'spi',
-            }
-            sigrok.put(outdata)
-            # Reset decoder state
-            self.rxdata = 0
-            self.rxcount = 0
-            # Keep stats for summary
-            self.bytesreceived += 1
+            # If this is the first bit, save its sample number.
+            if self.bitcount == 0:
+                self.start_sample = samplenum
 
-if __name__ == '__main__':
-    data = open('spi_dump.bin').read()
+            # Receive bit into our shift register.
+            if mosi == 1:
+                self.mosidata |= 1 << (7 - self.bitcount)
+            if miso == 1:
+                self.misodata |= 1 << (7 - self.bitcount)
 
-    # dummy class to keep Decoder happy for test
-    class Sigrok():
-        def put(self, data):
-            print "\t", data
-    sigrok = Sigrok()
+            self.bitcount += 1
 
-    dec = Decoder(driver='ols', unitsize=1, starttime=0)
-    dec.decode({'time':0, 'duration':len(data), 'data':data, 'type':'logic'})
+            # Continue to receive if not a byte yet.
+            if self.bitcount != 8:
+                continue
+
+            self.put(self.start_sample, self.samplenum, self.out_proto,
+                     ['data', self.mosidata, self.misodata])
+            self.put(self.start_sample, self.samplenum, self.out_ann,
+                     [ANN_HEX, ['MOSI: 0x%02x, MISO: 0x%02x' % (self.mosidata,
+                     self.misodata)]])
 
-    print dec.summary()
-else:
-    import sigrok
+            # Reset decoder state.
+            self.mosidata = 0
+            self.misodata = 0
+            self.bitcount = 0
 
-#Tested with:
-#  sigrok-cli -d 0:samplerate=1000000:rle=on --time=1s -p 1,2 -a spidec
+            # Keep stats for summary.
+            self.bytesreceived += 1