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):
cond_reset = len(condition)
condition.append({PIN_RESET: opt_edge_map[reset_edge]})
- edge_count = 0
+ edge_count = int(self.options['edge_off'])
edge_start = None
- word_count = 0
+ 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
+
while True:
self.wait(condition)
now = self.samplenum
if have_reset and self.matched[cond_reset]:
- edge_count = 0
+ edge_count = int(self.options['edge_off'])
edge_start = now
- word_count = 0
+ 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
+
+ if dead_count:
+ dead_count -= 1
+ edge_start = now
+ word_start = now
continue
# Implementation note: In the absence of a RESET condition
self.putc(ROW_EDGE, edge_start, ["{:d}".format(edge_count)])
edge_start = now
- if divider and (edge_count % divider) == 0:
+ 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