-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
-
-def sampleiter(data, unitsize):
- for i in range(0, len(data), unitsize):
- yield(Sample(data[i:i+unitsize]))
-
-class Decoder():
- # Probe names with a set of defaults
- probes = {'sdata':0, 'sck':1}
-
- def __init__(self, unitsize, **kwargs):
- # Metadata comes in here, we don't care for now
- #print kwargs
- self.unitsize = unitsize
-
- self.probes = Decoder.probes
- self.oldsck = True
- self.rxcount = 0
- self.rxdata = 0
- self.bytesreceived = 0
-
- def summary(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):
-
- sck = sample.probe(self.probes["sck"])
- # Sample SDATA on rising SCK
- if sck == self.oldsck:
- continue
- self.oldsck = sck
- if not sck:
- 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",
- }
- print outdata
- sigrok.put(outdata)
- # Reset decoder state
- self.rxdata = 0
- self.rxcount = 0
- # Keep stats for summary
- self.bytesreceived += 1
-
-
-register = {
- 'id': 'spi',
- 'name': 'SPI Decoder',
- 'longname': '...',
- 'desc': 'Decodes SPI frames',
- 'longdesc': '...',
- 'author': 'Gareth McMullin',
- 'email': 'gareth@blacksphere.co.nz',
- 'license': 'gplv2+',
- 'in': ['logic'],
- 'out': ['spi'],
- 'probes': [
- # All probes.
- ],
- 'options': {
- # No options so far.
- },
- # 'start': start,
- # 'report': report,
-}
-
-if __name__ == "__main__":
- data = open("spi_dump.bin").read()
-
- # dummy class to keep Decoder happy for test
- class Sigrok():
- def put(self, data):
- print "\t", data
- sigrok = Sigrok()
-
- dec = Decoder(driver='ols', unitsize=1, starttime=0)
- dec.decode({"time":0, "duration":len(data), "data":data, "type":"logic"})
-
- print dec.summary()
-else:
- import sigrok
-
-#Tested with:
-# sigrok-cli -d 0:samplerate=1000000:rle=on --time=1s -p 1,2 -a spidec
-
+##
+## This file is part of the sigrok project.
+##
+## Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
+##
+## 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
+## the Free Software Foundation; either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+##
+
+import sigrokdecode
+
+class Decoder(sigrokdecode.Decoder):
+ id = 'spi'
+ name = 'SPI'
+ desc = '...desc...'
+ longname = 'Serial Peripheral Interface (SPI) bus'
+ longdesc = '...longdesc...'
+ author = 'Gareth McMullin'
+ email = 'gareth@blacksphere.co.nz'
+ license = 'gplv2+'
+ inputs = ['logic']
+ outputs = ['spi']
+ probes = [
+ {'id': 'sdata', 'name': 'DATA', 'desc': 'SPI data line (MISO or MOSI)'},
+ {'id': 'sck', 'name': 'CLK', 'desc': 'SPI clock line'},
+ ]
+ options = {}
+
+ def __init__(self):
+ self.oldsck = 1
+ self.rxcount = 0
+ self.rxdata = 0
+ self.bytesreceived = 0
+ self.out_proto = None
+ self.out_ann = None
+
+ def start(self, metadata):
+ # self.out_proto = self.add(sigrokdecode.SRD_OUTPUT_PROTO, 'spi')
+ self.out_ann = self.add(sigrokdecode.SRD_OUTPUT_ANN, 'spi')
+
+ def report(self):
+ return 'SPI: %d bytes received' % self.bytesreceived
+
+ def decode(self, timeoffset, duration, 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, (sdata, sck, x, y, z, a)) in data:
+
+ # Sample SDATA on rising SCK
+ if sck == self.oldsck:
+ continue
+ self.oldsck = sck
+ if not sck:
+ continue
+
+ # If this is first bit, save timestamp
+ if self.rxcount == 0:
+ self.time = timeoffset # FIXME
+ # Receive bit into our shift register
+ 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':timeoffset + duration - self.time,
+ 'data':self.rxdata,
+ 'display':('%02X' % self.rxdata),
+ 'type':'spi',
+ }
+ # self.put(0, 0, self.out_proto, out_proto)
+ self.put(0, 0, self.out_ann, outdata)
+ # Reset decoder state
+ self.rxdata = 0
+ self.rxcount = 0
+ # Keep stats for summary
+ self.bytesreceived += 1
projects / libsigrokdecode.git / blobdiff