import sigrokdecode as srd
-(PIN_DATA, PIN_RESET) = range(2)
-(ROW_EDGE, ROW_WORD, ROW_RESET) = range(3)
+PIN_DATA, PIN_RESET = range(2)
+ROW_EDGE, ROW_WORD, ROW_RESET = range(3)
class Decoder(srd.Decoder):
api_version = 3
id = 'counter'
name = 'Counter'
longname = 'Edge counter'
- desc = 'Count number of edges.'
+ desc = 'Count the number of edges in a signal.'
license = 'gplv2+'
inputs = ['logic']
outputs = []
+ tags = ['Util']
channels = (
{'id': 'data', 'name': 'Data', 'desc': 'Data line'},
)
{'id': 'divider', 'desc': 'Count divider (word width)', 'default': 0},
{'id': 'reset_edge', 'desc': 'Edge which clears counters (reset)',
'default': 'falling', 'values': ('rising', 'falling')},
+ {'id': 'edge_off', 'desc': 'Edge counter value after start/reset', 'default': 0},
+ {'id': 'word_off', 'desc': 'Word counter value after start/reset', 'default': 0},
+ {'id': 'dead_cycles', 'desc': 'Ignore this many edges after reset', 'default': 0},
+ {'id': 'start_with_reset', 'desc': 'Assume decode starts with reset',
+ 'default': 'no', 'values': ('no', 'yes')},
)
def __init__(self):
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
- def putc(self, cls, annlist):
- self.put(self.samplenum, self.samplenum, self.out_ann, [cls, annlist])
+ def putc(self, cls, ss, annlist):
+ self.put(ss, self.samplenum, self.out_ann, [cls, annlist])
def decode(self):
opt_edge_map = {'rising': 'r', 'falling': 'f', 'any': 'e'}
- self.edge = self.options['data_edge']
- self.divider = self.options['divider']
- if self.divider < 0:
- self.divider = 0
+ data_edge = self.options['data_edge']
+ divider = self.options['divider']
+ if divider < 0:
+ divider = 0
+ reset_edge = self.options['reset_edge']
- condition = [{PIN_DATA: opt_edge_map[self.edge]}]
- self.have_reset = self.has_channel(PIN_RESET)
- if self.have_reset:
+ condition = [{PIN_DATA: opt_edge_map[data_edge]}]
+ have_reset = self.has_channel(PIN_RESET)
+ if have_reset:
cond_reset = len(condition)
- condition.append({PIN_RESET: opt_edge_map[self.options['reset_edge']]})
+ condition.append({PIN_RESET: opt_edge_map[reset_edge]})
+
+ edge_count = int(self.options['edge_off'])
+ edge_start = None
+ word_count = int(self.options['word_off'])
+ word_start = None
+
+ if self.options['start_with_reset'] == 'yes':
+ dead_count = int(self.options['dead_cycles'])
+ else:
+ dead_count = 0
- self.edge_count = 0
- self.word_count = 0
while True:
self.wait(condition)
+ now = self.samplenum
- if self.have_reset and self.matched[cond_reset]:
- self.edge_count = 0
- self.word_count = 0
- self.putc(ROW_RESET, ['Word reset', 'Reset', 'Rst', 'R'])
+ if have_reset and self.matched[cond_reset]:
+ edge_count = int(self.options['edge_off'])
+ edge_start = now
+ word_count = int(self.options['word_off'])
+ word_start = now
+ self.putc(ROW_RESET, now, ['Word reset', 'Reset', 'Rst', 'R'])
+ dead_count = int(self.options['dead_cycles'])
continue
- self.edge_count += 1
- self.putc(ROW_EDGE, [str(self.edge_count)])
+ if dead_count:
+ dead_count -= 1
+ edge_start = now
+ word_start = now
+ continue
+
+ # Implementation note: In the absence of a RESET condition
+ # before the first data edge, any arbitrary choice of where
+ # to start the annotation is valid. One may choose to emit a
+ # narrow annotation (where ss=es), or assume that the cycle
+ # which corresponds to the counter value started at sample
+ # number 0. We decided to go with the latter here, to avoid
+ # narrow annotations (see bug #1210). None of this matters in
+ # the presence of a RESET condition in the input stream.
+ if edge_start is None:
+ edge_start = 0
+ if word_start is None:
+ word_start = 0
+
+ edge_count += 1
+ self.putc(ROW_EDGE, edge_start, ["{:d}".format(edge_count)])
+ edge_start = now
- if self.divider > 0 and (self.edge_count % self.divider) == 0:
- self.word_count += 1
- self.putc(ROW_WORD, [str(self.word_count)])
+ word_edge_count = edge_count - int(self.options['edge_off'])
+ if divider and (word_edge_count % divider) == 0:
+ word_count += 1
+ self.putc(ROW_WORD, word_start, ["{:d}".format(word_count)])
+ word_start = now