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92 lines
3.1 KiB
92 lines
3.1 KiB
import logging
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import random
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import cocotb
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import wavedrom
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from collections import defaultdict
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from Sram import SramRead, SramWrite, SramMonitor
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from cocotb.clock import Clock
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from cocotb.triggers import FallingEdge, RisingEdge, Timer, ReadOnly
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from cocotbext.wishbone.driver import WishboneMaster, WBOp
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from cocotb.wavedrom import Wavedrom, trace
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# Reset coroutine
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async def reset_dut(reset_n, duration_ns):
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reset_n.value = 1
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await Timer(duration_ns, units="ns")
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reset_n.value = 0
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def wave2svg(wave, file):
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svg = wavedrom.render(wave)
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svg.saveas(file)
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@cocotb.test()
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async def test_wishbone(dut):
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""" First simple test """
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clkedge = RisingEdge(dut.wbclk_i)
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# Connect reset
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reset = dut.wbrst_i
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# Create empty SRAM memory
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memory = defaultdict()
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mem_read = SramRead(dut.wbclk_i, dut.localren_o,
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dut.localadress_o, dut.localdata_i, memory);
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mem_write = SramWrite(dut.wbclk_i, dut.localwen_o,
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dut.localadress_o, dut.localdata_o, memory);
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sram_monitor = SramMonitor(dut.wbclk_i, dut.localwen_o, dut.localren_o,
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dut.localadress_o, dut.localdata_i, dut.localdata_o);
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wbmaster = WishboneMaster(dut, "", dut.wbclk_i,
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width=16, # size of data bus
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timeout=10, # in clock cycle number
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signals_dict={"cyc": "wbcyc_i",
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"stb": "wbstb_i",
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"we": "wbwe_i",
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"adr": "wbadr_i",
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"datwr":"wbdat_i",
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"datrd":"wbdat_o",
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"ack": "wback_o" })
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# Drive input defaults (setimmediatevalue to avoid x asserts)
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dut.wbcyc_i.setimmediatevalue(0)
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dut.wbstb_i.setimmediatevalue(0)
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dut.wbwe_i.setimmediatevalue(0)
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dut.wbadr_i.setimmediatevalue(0)
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dut.wbdat_i.setimmediatevalue(0)
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clock = Clock(dut.wbclk_i, 10, units="ns") # Create a 10 ns period clock
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cocotb.start_soon(clock.start()) # Start the clock
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# Execution will block until reset_dut has completed
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await reset_dut(reset, 100)
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dut._log.info("Released reset")
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# Trace transmissions using wavedrom
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with trace(dut.wbcyc_i, dut.wbstb_i, dut.wbwe_i, dut.wback_o,
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dut.wbadr_i, dut.wbdat_i, dut.wbdat_o, clk=dut.wbclk_i) as waves:
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# Test 10 Wishbone transmissions
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for i in range(10):
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await clkedge
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adr = random.randint(0, 255)
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data = random.randint(0, 2**16-1)
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await wbmaster.send_cycle([WBOp(adr=adr, dat=data)])
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rec = await wbmaster.send_cycle([WBOp(adr=adr)])
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# Print out waveforms as json & svg
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_wave = waves.dumpj()
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with open('results/tb_wishbone_wave.json', 'w', encoding='utf-8') as f:
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f.write(_wave)
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wave2svg(_wave, 'results/tb_wishbone_wave.svg')
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# Example to print transactions collected by SRAM monitor
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with open('results/tb_wishbone_sram_transactions.log', 'w', encoding='utf-8') as f:
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f.write((f"{'Time':7}{'Type':7}{'Adr':6}{'Data'}\n"))
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for key, value in sram_monitor.transactions.items():
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f.write((f"{key:7}{value['type']:7}{hex(value['adr']):6}{hex(value['data'])}\n"))
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