diff options
Diffstat (limited to 'decoders/spi/pd.py')
| -rw-r--r-- | decoders/spi/pd.py | 85 |
1 files changed, 45 insertions, 40 deletions
diff --git a/decoders/spi/pd.py b/decoders/spi/pd.py index 0d35c0b..2d971d3 100644 --- a/decoders/spi/pd.py +++ b/decoders/spi/pd.py @@ -104,18 +104,15 @@ class Decoder(srd.Decoder): self.samplerate = None self.oldclk = 1 self.bitcount = 0 - self.mosidata = 0 - self.misodata = 0 - self.mosibits = [] + self.misodata = self.mosidata = 0 self.misobits = [] + self.mosibits = [] self.startsample = -1 self.samplenum = -1 self.cs_was_deasserted_during_data_word = 0 self.oldcs = -1 self.oldpins = None - self.have_cs = None - self.have_miso = None - self.have_mosi = None + self.have_cs = self.have_miso = self.have_mosi = None self.state = 'IDLE' def metadata(self, key, value): @@ -134,11 +131,28 @@ class Decoder(srd.Decoder): def putw(self, data): self.put(self.startsample, self.samplenum, self.out_ann, data) - def putmisobit(self, i, data): - self.put(self.misobits[i][1], self.misobits[i][2], self.out_ann, data) + def putdata(self): + # Pass MISO and MOSI bits and then data to the next PD up the stack. + so = self.misodata if self.have_miso else None + si = self.mosidata if self.have_mosi else None + so_bits = self.misobits if self.have_miso else None + si_bits = self.mosibits if self.have_mosi else None + self.putpw(['BITS', si_bits, so_bits]) + self.putpw(['DATA', si, so]) - def putmosibit(self, i, data): - self.put(self.mosibits[i][1], self.mosibits[i][2], self.out_ann, data) + # Bit annotations. + if self.have_miso: + for bit in self.misobits: + self.put(bit[1], bit[2], self.out_ann, [2, ['%d' % bit[0]]]) + if self.have_mosi: + for bit in self.mosibits: + self.put(bit[1], bit[2], self.out_ann, [3, ['%d' % bit[0]]]) + + # Dataword annotations. + if self.have_miso: + self.putw([0, ['%02X' % self.misodata]]) + if self.have_mosi: + self.putw([1, ['%02X' % self.mosidata]]) def reset_decoder_state(self): self.misodata = 0 if self.have_miso else None @@ -159,6 +173,13 @@ class Decoder(srd.Decoder): ws = self.options['wordsize'] + # Receive MISO bit into our shift register. + if self.have_miso: + if self.options['bitorder'] == 'msb-first': + self.misodata |= miso << (ws - 1 - self.bitcount) + else: + self.misodata |= miso << self.bitcount + # Receive MOSI bit into our shift register. if self.have_mosi: if self.options['bitorder'] == 'msb-first': @@ -166,24 +187,20 @@ class Decoder(srd.Decoder): else: self.mosidata |= mosi << self.bitcount - # Receive MISO bit into our shift register. - if self.have_miso: - if self.options['bitorder'] == 'msb-first': - self.misodata |= miso << (ws - 1 - self.bitcount) - else: - self.misodata |= miso << self.bitcount + # Guesstimate the endsample for this bit (can be overridden later). + es = self.samplenum + if self.bitcount > 0: + es += self.samplenum - self.misobits[self.bitcount - 1][1] if self.have_miso: - self.misobits.append([miso, self.samplenum, -1]) + self.misobits.append([miso, self.samplenum, es]) if self.have_mosi: - self.mosibits.append([mosi, self.samplenum, -1]) - if self.bitcount != 0: - if self.have_miso: - self.misobits[self.bitcount - 1][2] = self.samplenum - self.putmisobit(self.bitcount - 1, [3, ['%d' % miso]]) - if self.have_mosi: - self.mosibits[self.bitcount - 1][2] = self.samplenum - self.putmosibit(self.bitcount - 1, [2, ['%d' % mosi]]) + self.mosibits.append([mosi, self.samplenum, es]) + + if self.bitcount > 0 and self.have_miso: + self.misobits[self.bitcount - 1][2] = self.samplenum + if self.bitcount > 0 and self.have_mosi: + self.mosibits[self.bitcount - 1][2] = self.samplenum self.bitcount += 1 @@ -191,23 +208,11 @@ class Decoder(srd.Decoder): if self.bitcount != ws: return - si = self.mosidata if self.have_mosi else None - so = self.misodata if self.have_miso else None - si_bits = self.mosibits if self.have_mosi else None - so_bits = self.misobits if self.have_miso else None - - # Pass MOSI and MISO to the next PD up the stack. - self.putpw(['DATA', si, so]) - self.putpw(['BITS', si_bits, so_bits]) - - # Annotations. - if self.have_miso: - self.putw([0, ['%02X' % self.misodata]]) - if self.have_mosi: - self.putw([1, ['%02X' % self.mosidata]]) + self.putdata() # Meta bitrate. - elapsed = 1 / float(self.samplerate) * (self.samplenum - self.startsample + 1) + elapsed = 1 / float(self.samplerate) + elapsed *= (self.samplenum - self.startsample + 1) bitrate = int(1 / elapsed * self.options['wordsize']) self.put(self.startsample, self.samplenum, self.out_bitrate, bitrate) |