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Fixed random clock period generation #105

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Fixed random clock period generation #105

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30 changes: 14 additions & 16 deletions lambdalib/ramlib/tests/tb_la_asyncfifo.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import random
import string
from decimal import Decimal

import siliconcompiler
Expand All @@ -7,7 +8,6 @@
from cocotb.clock import Clock
from cocotb.triggers import ClockCycles, Timer, Combine
from cocotb.regression import TestFactory
from cocotb import utils

from lambdalib import ramlib
from lambdalib.utils._tb_common import (
Expand All @@ -30,6 +30,12 @@ def bursty_en_gen(burst_len=20):
yield en_state


def random_decimal(max: int, min: int, decimal_places=2) -> Decimal:
prefix = str(random.randint(min, max))
suffix = ''.join(random.choice(string.digits) for _ in range(decimal_places))
return Decimal(prefix + "." + suffix)


@cocotb.test()
async def test_almost_full(dut):

Expand Down Expand Up @@ -115,7 +121,7 @@ async def fifo_rd_wr_test(

await cocotb.start(Clock(dut.wr_clk, wr_clk_period_ns, units="ns").start())
# Randomize phase shift between clocks
await Timer(wr_clk_period_ns * random.random(), "ns", round_mode="round")
await Timer(wr_clk_period_ns * Decimal(random.random()), "ns", round_mode="round")
await cocotb.start(Clock(dut.rd_clk, rd_clk_period_ns, units="ns").start())

await ClockCycles(dut.wr_clk, 3)
Expand All @@ -134,21 +140,13 @@ async def fifo_rd_wr_test(


# Generate sets of tests based on the different permutations of the possible arguments to fifo_test
MAX_PERIOD_NS = 10.0
MIN_PERIOD_NS = 1.0
MAX_PERIOD_NS = 10
MIN_PERIOD_NS = 1

# Generate random clk period to test between min and max
RAND_WR_CLK_PERIOD_NS, RAND_RD_CLK_PERIOD_NS = [utils.get_time_from_sim_steps(
# Time step must be even for cocotb clock driver
steps=utils.get_sim_steps(
time=Decimal(MIN_PERIOD_NS) + (
Decimal(MAX_PERIOD_NS - MIN_PERIOD_NS)
* Decimal(random.random()).quantize(Decimal("0.00"))
),
units="ns",
round_mode="round"
) & ~1,
units="ns"
) for _ in range(0, 2)]
RAND_WR_CLK_PERIOD_NS, RAND_RD_CLK_PERIOD_NS = [
random_decimal(MAX_PERIOD_NS, MIN_PERIOD_NS) for _ in range(2)
]

# Factory to automatically generate a set of tests based on the different permutations
# of the provided test arguments
Expand Down