diff options
Diffstat (limited to 'decoders')
| -rw-r--r-- | decoders/spi/pd.py | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/decoders/spi/pd.py b/decoders/spi/pd.py index 3abcd68..4a686dd 100644 --- a/decoders/spi/pd.py +++ b/decoders/spi/pd.py @@ -183,14 +183,16 @@ class Decoder(srd.Decoder): self.mosibits = [] if self.have_mosi else None self.bitcount = 0 + def cs_asserted(self, cs): + active_low = (self.options['cs_polarity'] == 'active-low') + return (cs == 0) if active_low else (cs == 1) + def handle_bit(self, miso, mosi, clk, cs): # If this is the first bit of a dataword, save its sample number. if self.bitcount == 0: self.ss_block = self.samplenum - self.cs_was_deasserted = False - if self.have_cs: - active_low = (self.options['cs_polarity'] == 'active-low') - self.cs_was_deasserted = (cs == 1) if active_low else (cs == 0) + self.cs_was_deasserted = \ + not self.cs_asserted(cs) if self.have_cs else False ws = self.options['wordsize'] @@ -254,6 +256,10 @@ class Decoder(srd.Decoder): # Reset decoder state when CS# changes (and the CS# pin is used). self.reset_decoder_state() + # We only care about samples if CS# is asserted. + if self.have_cs and not self.cs_asserted(cs): + return + # Ignore sample if the clock pin hasn't changed. if clk == self.oldclk: return |