Add singlepulse support

peakrdl/regblock/field_logic/__init__.py

@@ -5,6 +5,7 @@ from systemrdl.rdltypes import PropertyReference, PrecedenceType
 from .bases import AssignmentPrecedence, NextStateConditional
 from . import sw_onread
 from . import sw_onwrite
+from . import sw_singlepulse
 from . import hw_write
 from . import hw_set_clr
 
@@ -189,6 +190,8 @@ class FieldLogic:
         self.add_sw_conditional(sw_onwrite.WriteSet(self.exp), AssignmentPrecedence.SW_ONWRITE)
         self.add_sw_conditional(sw_onwrite.Write(self.exp), AssignmentPrecedence.SW_ONWRITE)
 
+        self.add_sw_conditional(sw_singlepulse.Singlepulse(self.exp), AssignmentPrecedence.SW_SINGLEPULSE)
+
         self.add_hw_conditional(hw_write.AlwaysWrite(self.exp), AssignmentPrecedence.HW_WRITE)
         self.add_hw_conditional(hw_write.WELWrite(self.exp), AssignmentPrecedence.HW_WRITE)
         self.add_hw_conditional(hw_write.WEWrite(self.exp), AssignmentPrecedence.HW_WRITE)

peakrdl/regblock/field_logic/bases.py

@@ -24,6 +24,7 @@ class AssignmentPrecedence(enum.IntEnum):
     # Software access assignment groups
     SW_ONREAD = 5000
     SW_ONWRITE = 4000
+    SW_SINGLEPULSE = 3000
 
     # Hardware access assignment groups
     HW_WRITE = 3000

peakrdl/regblock/field_logic/sw_singlepulse.py

@@ -0,0 +1,23 @@
+from typing import TYPE_CHECKING, List
+
+from .bases import NextStateConditional
+
+if TYPE_CHECKING:
+    from systemrdl.node import FieldNode
+
+class Singlepulse(NextStateConditional):
+    comment = "singlepulse clears back to 0"
+    def is_match(self, field: 'FieldNode') -> bool:
+        return field.get_property('singlepulse')
+
+    def get_predicate(self, field: 'FieldNode') -> str:
+        # TODO: make exporter promote this to an "else"?
+        # Be mindful of sw/hw precedence. this would have to come last regardless
+        return "1"
+
+    def get_assignments(self, field: 'FieldNode') -> List[str]:
+        field_path = self.get_field_path(field)
+        return [
+            f"field_combo.{field_path}.next = '0;",
+            f"field_combo.{field_path}.load_next = '1;",
+        ]