diff options
Diffstat (limited to 'decoders/tlc5620')
| -rw-r--r-- | decoders/tlc5620/pd.py | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/decoders/tlc5620/pd.py b/decoders/tlc5620/pd.py index e086c4d..df42bfb 100644 --- a/decoders/tlc5620/pd.py +++ b/decoders/tlc5620/pd.py @@ -44,6 +44,12 @@ class Decoder(srd.Decoder): {'id': 'load', 'name': 'LOAD', 'desc': 'Serial interface load control'}, {'id': 'ldac', 'name': 'LDAC', 'desc': 'Load DAC'}, ) + options = ( + {'id': 'vref_a', 'desc': 'Reference voltage DACA (V)', 'default': 3.3}, + {'id': 'vref_b', 'desc': 'Reference voltage DACB (V)', 'default': 3.3}, + {'id': 'vref_c', 'desc': 'Reference voltage DACC (V)', 'default': 3.3}, + {'id': 'vref_d', 'desc': 'Reference voltage DACD (V)', 'default': 3.3}, + ) annotations = ( ('dac-select', 'DAC select'), ('gain', 'Gain'), @@ -74,6 +80,7 @@ class Decoder(srd.Decoder): self.ss_value = self.es_value = 0 self.dac_select = self.gain = self.dac_value = None self.dacval = {'A': '?', 'B': '?', 'C': '?', 'D': '?'} + self.gains = {'A': '?', 'B': '?', 'C': '?', 'D': '?'} def start(self): self.out_ann = self.register(srd.OUTPUT_ANN) @@ -135,20 +142,23 @@ 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']]) + vref = self.options['vref_%s' % self.dac_select[3].lower()] + v = '%.2fV' % (vref * (v / 256) * self.gain) 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)]]) + [7, ['Setting %s voltage to %s' % (s, v), + '%s=%s' % (s, v)]]) 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)]]) + [6, ['Setting %s register value to %s' % \ + (s, v), '%s=%s' % (s, v)]]) # Save the last value the respective DAC was set to. self.dacval[self.dac_select[-1]] = str(self.dac_value) + self.gains[self.dac_select[-1]] = self.gain def handle_falling_edge_ldac(self): self.put(self.samplenum, self.samplenum, self.out_ann, @@ -158,7 +168,17 @@ class Decoder(srd.Decoder): if self.ss_dac_first is None: return - s = ''.join(['DAC%s=%s ' % (d, self.dacval[d]) for d in 'ABCD']).strip() + # Calculate voltages based on Vref and the per-DAC gain. + dacval = {} + for key, val in self.dacval.items(): + if val == '?': + dacval[key] = '?' + else: + vref = self.options['vref_%s' % key.lower()] + v = vref * (int(val) / 256) * self.gains[key] + dacval[key] = '%.2fV' % v + + s = ''.join(['DAC%s=%s ' % (d, 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 |