cocotb: Try to run quickstart

Passes both using SIM=verilator and SIM=icarus

1 files changed, 29 insertions, 0 deletions

diff --git a/cocotb_try/test_my_design.py b/cocotb_try/test_my_design.py
new file mode 100644
index 0000000..5136e31
--- /dev/null
+++ b/cocotb_try/test_my_design.py
@@ -0,0 +1,29 @@
+
+# https://docs.cocotb.org/en/stable/quickstart.html
+# test_my_design.py (extended)
+
+import cocotb
+from cocotb.triggers import FallingEdge, Timer
+
+
+async def generate_clock(dut):
+    """Generate clock pulses."""
+
+    for cycle in range(10):
+        dut.clk.value = 0
+        await Timer(1, units="ns")
+        dut.clk.value = 1
+        await Timer(1, units="ns")
+
+
+@cocotb.test()
+async def my_second_test(dut):
+    """Try accessing the design."""
+
+    await cocotb.start(generate_clock(dut))  # run the clock "in the background"
+
+    await Timer(5, units="ns")  # wait a bit
+    await FallingEdge(dut.clk)  # wait for falling edge/"negedge"
+
+    dut._log.info("my_signal_1 is %s", dut.my_signal_1.value)
+    assert dut.my_signal_2.value[0] == 0, "my_signal_2[0] is not 0!"