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https://github.com/Silicon1602/srdl2sv.git
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52 lines
1.4 KiB
Python
52 lines
1.4 KiB
Python
from enum import Enum
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from cocotb.clock import Clock
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import cocotb
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import random
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from libs import AMBA3AHBLiteDriver
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@cocotb.test()
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async def test_simple_rw_reg(dut):
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"""Test writing via the bus and reading back"""
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clock = Clock(dut.clk, 1, units="ns") # Create a 10us period clock on port clk
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cocotb.fork(clock.start()) # Start the clock
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bus = AMBA3AHBLiteDriver.AMBA3AHBLiteDriver(dut=dut, nbytes=4)
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await bus.reset()
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# Write in 1, 2, and 4 byte steps
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for step_size in (1, 2, 4):
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dut._log.info(f"Writing in {step_size} steps.")
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write_dict = {}
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read_dict = {}
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for addr in range(0, 8, step_size):
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rand_val = random.randint(0, (1 << (step_size * 8))-1)
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dut._log.info(f"Write value {rand_val} to addres {addr}.")
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write_dict.update(
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await bus.write(
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address=addr,
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value=rand_val,
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nbytes=step_size,
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step_size=step_size))
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for addr in range(0, 8, step_size):
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read_dict.update(
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await bus.read(
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address=addr,
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nbytes=step_size,
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step_size=step_size))
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# Check at end of every step_size
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dut._log.info(f"Wrote dictionary {write_dict}")
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dut._log.info(f"Read back dictionary {read_dict}")
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assert write_dict == read_dict, "Read and write values differ!"
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