diff options
Diffstat (limited to 'decoders/tlc5620/pd.py')
| -rw-r--r-- | decoders/tlc5620/pd.py | 40 |
1 files changed, 34 insertions, 6 deletions
diff --git a/decoders/tlc5620/pd.py b/decoders/tlc5620/pd.py index 0a7b228..0f9b2a1 100644 --- a/decoders/tlc5620/pd.py +++ b/decoders/tlc5620/pd.py @@ -51,23 +51,27 @@ class Decoder(srd.Decoder): ('data-latch', 'Data latch point'), ('ldac-fall', 'LDAC falling edge'), ('bit', 'Bit'), - ('operation', 'Operation'), + ('reg-write', 'Register write'), + ('voltage-update', 'Voltage update'), + ('voltage-update-all', 'Voltage update (all DACs)'), ) annotation_rows = ( ('bits', 'Bits', (5,)), ('fields', 'Fields', (0, 1, 2)), - ('operations', 'Operations', (6,)), + ('registers', 'Registers', (6, 7)), + ('voltage-updates', 'Voltage updates', (8,)), ('events', 'Events', (3, 4)), ) def __init__(self, **kwargs): self.oldpins = self.oldclk = self.oldload = self.oldldac = None - self.datapin = None self.bits = [] + self.ss_dac_first = None self.ss_dac = self.es_dac = 0 self.ss_gain = self.es_gain = 0 self.ss_value = self.es_value = 0 self.dac_select = self.gain = self.dac_value = None + self.dacval = {'A': '?', 'B': '?', 'C': '?', 'D': '?'} def start(self): self.out_ann = self.register(srd.OUTPUT_ANN) @@ -83,6 +87,9 @@ class Decoder(srd.Decoder): self.clock_width = self.es_gain - self.ss_gain self.es_value = self.bits[10][1] + self.clock_width # Guessed. + if self.ss_dac_first is None: + self.ss_dac_first = self.ss_dac + s = ''.join(str(i[0]) for i in self.bits[:2]) self.dac_select = s = dacs[int(s, 2)] self.put(self.ss_dac, self.es_dac, self.out_ann, @@ -113,14 +120,34 @@ class Decoder(srd.Decoder): s, v, g = self.dac_select, self.dac_value, self.gain self.put(self.samplenum, self.samplenum, self.out_ann, [3, ['Falling edge on LOAD', 'LOAD fall', 'F']]) - self.put(self.ss_dac, self.es_value, self.out_ann, - [6, ['Setting %s value to %d (x%d gain)' % (s, v, g), - '%s=%d (x%d gain)' % (s, v, g)]]) + if self.ldac == 0: + # If LDAC is low, the voltage is set immediately. + self.put(self.ss_dac, self.es_value, self.out_ann, + [7, ['Setting %s voltage to %d (x%d gain)' % (s, v, g), + '%s=%d (x%d gain)' % (s, v, g)]]) + else: + # If LDAC is high, the voltage is not set immediately, but rather + # stored in a register. When LDAC goes low all four DAC voltages + # (DAC A/B/C/D) will be set at the same time. + self.put(self.ss_dac, self.es_value, self.out_ann, + [6, ['Setting %s register value to %d (x%d gain)' % \ + (s, v, g), '%s=%d (x%d gain)' % (s, v, g)]]) + # Save the last value the respective DAC was set to. + self.dacval[self.dac_select[-1]] = str(self.dac_value) def handle_falling_edge_ldac(self): self.put(self.samplenum, self.samplenum, self.out_ann, [4, ['Falling edge on LDAC', 'LDAC fall', 'LDAC', 'L']]) + # Don't emit any annotations if we didn't see any register writes. + if self.ss_dac_first is None: + return + + s = ''.join(['DAC%s=%s ' % (d, self.dacval[d]) for d in 'ABCD']).strip() + self.put(self.ss_dac_first, self.samplenum, self.out_ann, + [8, ['Updating voltages: %s' % s, s, s.replace('DAC', '')]]) + self.ss_dac_first = None + def handle_new_dac_bit(self): self.bits.append([self.datapin, self.samplenum]) @@ -131,6 +158,7 @@ class Decoder(srd.Decoder): if self.oldpins == pins: continue self.oldpins, (clk, self.datapin, load, ldac) = pins, pins + self.ldac = ldac # DATA is shifted in the DAC on the falling CLK edge (MSB-first). # A falling edge of LOAD will latch the data. |