Correct two howling errors in the capture logic – how did I not notice these before?

Fixed small problem when serial_number is not specified.

scope.py

@@ -174,9 +174,11 @@ class Scope(vm.VirtualMachine):
             if capture_mode.analog_channels == len(analog_channels) and capture_mode.logic_channels == bool(logic_channels):
                 Log.debug(f"Considering trace mode {capture_mode.trace_mode.name}...")
                 if ticks > capture_mode.clock_high and capture_mode.clock_divide > 1:
-                    clock_scale = int(math.ceil(period / self.primary_clock_period / nsamples / capture_mode.clock_high))
+                    clock_scale = min(capture_mode.clock_divide, int(math.ceil(period / self.primary_clock_period / nsamples / capture_mode.clock_high)))
                     ticks = int(round(period / self.primary_clock_period / nsamples / clock_scale))
-                    if ticks in range(capture_mode.clock_low, capture_mode.clock_high+1):
+                    if ticks > capture_mode.clock_low:
+                        if ticks > capture_mode.clock_high:
+                            ticks = capture_mode.clock_high
                         Log.debug(f"- try with tick count {ticks} x {clock_scale}")
                     else:
                         continue
@@ -234,15 +236,7 @@ class Scope(vm.VirtualMachine):
         if trigger_level is None:
             trigger_level = (high + low) / 2
         analog_trigger_level = (trigger_level - analog_params.offset) / analog_params.scale if not raw else trigger_level
-        if trigger in {'A', 'B'}:
-            if trigger == 'A':
-                spock_option |= vm.SpockOption.TriggerSourceA
-                trigger_logic = 0x80
-            elif trigger == 'B':
-                spock_option |= vm.SpockOption.TriggerSourceB
-                trigger_logic = 0x40
-            trigger_mask = 0xff ^ trigger_logic
-        elif isinstance(trigger, dict):
+        if isinstance(trigger, dict):
             trigger_logic = 0
             trigger_mask = 0xff
             for channel, value in trigger.items():
@@ -257,6 +251,14 @@ class Scope(vm.VirtualMachine):
                 trigger_mask &= ~mask
                 if value:
                     trigger_logic |= mask
+        elif trigger in {'A', 'B'}:
+            if trigger == 'A':
+                spock_option |= vm.SpockOption.TriggerSourceA
+                trigger_logic = 0x80
+            elif trigger == 'B':
+                spock_option |= vm.SpockOption.TriggerSourceB
+                trigger_logic = 0x40
+            trigger_mask = 0xff ^ trigger_logic
         else:
             raise ValueError("Unrecognised trigger value")
         trigger_type = trigger_type.lower()

streams.py

@@ -24,7 +24,7 @@ class SerialStream:
     @classmethod
     def devices_matching(cls, vid=None, pid=None, serial_number=None):
         for port in comports():
-            if (vid is None or vid == port.vid) and (pid is None or pid == port.pid) and (serial is None or serial_number == port.serial_number):
+            if (vid is None or vid == port.vid) and (pid is None or pid == port.pid) and (serial_number is None or serial_number == port.serial_number):
                 yield port.device
 
     @classmethod

vm.py

@@ -6,7 +6,7 @@ Package capturing BitScope VM specification, including registers, enumerations,
 commands and logic for encoding and decoding virtual machine instructions and data.
 
 All names and descriptions copyright BitScope and taken from their [VM specification
-document][VM01B].
+document][VM01B] (with slight changes).
 
 [VM01B]: https://docs.google.com/document/d/1cZNRpSPAMyIyAvIk_mqgEByaaHzbFTX8hWglAMTlnHY
 
@@ -90,8 +90,8 @@ Registers = DotDict({
     "TriggerOutro": Register(0x34, 'U16', "Edge trigger outro filter counter (samples/2)"),
     "TriggerValue": Register(0x44, 'S0.16', "Digital (comparator) trigger (signed)"),
     "TriggerTime": Register(0x40, 'U32', "Stopwatch trigger time (ticks)"),
-    "ClockTicks": Register(0x2e, 'U16', "Master Sample (clock) period (ticks)"),
-    "ClockScale": Register(0x14, 'U16', "Clock divide by N (low byte)"),
+    "ClockTicks": Register(0x2e, 'U16', "Sample period (ticks)"),
+    "ClockScale": Register(0x14, 'U16', "Sample clock divider"),
     "TraceOption": Register(0x20, 'U8', "Trace Mode Option bits"),
     "TraceMode": Register(0x21, 'U8', "Trace Mode (see Trace Mode Table)"),
     "TraceIntro": Register(0x26, 'U16', "Pre-trigger capture count (samples)"),
@@ -151,8 +151,8 @@ Registers = DotDict({
     "Map5": Register(0x99, 'U8', "Peripheral Pin Select Channel 5"),
     "Map6": Register(0x9a, 'U8', "Peripheral Pin Select Channel 6"),
     "Map7": Register(0x9b, 'U8', "Peripheral Pin Select Channel 7"),
-    "MasterClockN": Register(0xf7, 'U8', "PLL prescale (DIV N)"),
-    "MasterClockM": Register(0xf8, 'U16', "PLL multiplier (MUL M)"),
+    "PrimaryClockN": Register(0xf7, 'U8', "PLL prescale (DIV N)"),
+    "PrimaryClockM": Register(0xf8, 'U16', "PLL multiplier (MUL M)"),
 })