1 files changed, 50 insertions, 0 deletions
diff --git a/hdl/testing/up_counter.py b/hdl/testing/up_counter.py
new file mode 100644
index 0000000..050a6b0
--- /dev/null
+++ b/hdl/testing/up_counter.py
@@ -0,0 +1,50 @@
+from amaranth import *
+from amaranth.back import verilog
+
+
+class UpCounter(Elaboratable):
+    """
+    A 16-bit up counter with a fixed limit.
+
+    Parameters
+    ----------
+    limit : int
+        The value at which the counter overflows.
+
+    Attributes
+    ----------
+    en : Signal, in
+        The counter is incremented if ``en`` is asserted, and retains
+        its value otherwise.
+    ovf : Signal, out
+        ``ovf`` is asserted when the counter reaches its limit.
+    """
+    
+    def __init__(self, limit):
+        self.limit = limit
+
+        # Ports
+        self.en  = Signal()
+        self.ovf = Signal()
+
+        # State
+        self.count = Signal(16)
+
+    def elaborate(self, platform):
+        m = Module()
+
+        m.d.comb += self.ovf.eq(self.count == self.limit)
+
+        with m.If(self.en):
+            with m.If(self.ovf):
+                m.d.sync += self.count.eq(0)
+            with m.Else():
+                m.d.sync += self.count.eq(self.count + 1)
+
+        return m
+
+    def to_v(self):
+        return verilog.convert(self, ports=[self.en, self.ovf])
+
+top = UpCounter(25)
+print(top.to_v())
+\ No newline at end of file