self.mosibits = []
self.startsample = -1
self.samplenum = -1
- self.cs_was_deasserted_during_data_word = 0
+ self.cs_was_deasserted = False
self.oldcs = -1
self.oldpins = None
self.have_cs = self.have_miso = self.have_mosi = None
# Dataword annotations.
if self.have_miso:
- self.putw([0, ['%02X' % self.misodata]])
+ ss, es = self.misobits[0][1], self.misobits[-1][2]
+ self.put(ss, es, self.out_ann, [0, ['%02X' % self.misodata]])
if self.have_mosi:
- self.putw([1, ['%02X' % self.mosidata]])
+ ss, es = self.mosibits[0][1], self.mosibits[-1][2]
+ self.put(ss, es, self.out_ann, [1, ['%02X' % self.mosidata]])
def reset_decoder_state(self):
self.misodata = 0 if self.have_miso else None
# If this is the first bit of a dataword, save its sample number.
if self.bitcount == 0:
self.startsample = self.samplenum
+ self.cs_was_deasserted = False
if self.have_cs:
active_low = (self.options['cs_polarity'] == 'active-low')
- deasserted = cs if active_low else not cs
+ deasserted = (cs == 1) if active_low else (cs == 0)
if deasserted:
- self.cs_was_deasserted_during_data_word = 1
+ self.cs_was_deasserted = True
ws = self.options['wordsize']
else:
self.mosidata |= mosi << self.bitcount
- # Guesstimate the endsample for this bit (can be overridden later).
+ # Guesstimate the endsample for this bit (can be overridden below).
es = self.samplenum
if self.bitcount > 0:
es += self.samplenum - self.misobits[self.bitcount - 1][1]
bitrate = int(1 / elapsed * self.options['wordsize'])
self.put(self.startsample, self.samplenum, self.out_bitrate, bitrate)
- if self.have_cs and self.cs_was_deasserted_during_data_word:
+ if self.have_cs and self.cs_was_deasserted:
self.putw([4, ['CS# was deasserted during this data word!']])
self.reset_decoder_state()
self.have_mosi = (mosi in (0, 1))
self.have_cs = (cs in (0, 1))
+ # Either MISO or MOSI (but not both) can be omitted.
+ if not (self.have_miso or self.have_mosi):
+ raise Exception('Either MISO or MOSI (or both) pins required.')
+
# State machine.
if self.state == 'IDLE':
self.find_clk_edge(miso, mosi, clk, cs)