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50 lines
1.4 KiB
50 lines
1.4 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 Uart import UartDriver, UartReceiver
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from Vai import VaiDriver, VaiReceiver
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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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# Reset coroutine
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async def reset_dut(reset_n, duration_ns):
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reset_n.value = 0
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await Timer(duration_ns, units="ns")
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reset_n.value = 1
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@cocotb.test()
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async def test_uartrx(dut):
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""" First simple test """
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clkedge = RisingEdge(dut.clk_i)
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# Connect reset
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reset_n = dut.reset_n_i
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# Instantiate UART driver
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uart_driver = UartDriver(dut.rx_i, dut.clk_i, 10, 8, True);
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# Instantiate VAI receiver
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vai_receiver = VaiReceiver(dut.clk_i, dut.data_o, dut.valid_o, dut.accept_i)
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# Drive input defaults (setimmediatevalue to avoid x asserts)
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dut.rx_i.setimmediatevalue(1)
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dut.accept_i.setimmediatevalue(0)
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clock = Clock(dut.clk_i, 10, units="ns") # Create a 1 us 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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dut._log.info("Hold reset")
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await reset_dut(reset_n, 100)
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dut._log.info("Released reset")
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# Test 10 UART transmissions
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for i in range(10):
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await clkedge
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val = random.randint(0, 255)
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await uart_driver.send(val)
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rec = await vai_receiver.receive();
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assert rec == val, "UART received data was incorrect on the {}th cycle".format(i)
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