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23 lines
806 B
Python
23 lines
806 B
Python
import cocotb
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from cocotb.clock import Clock
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from cocotb.triggers import Timer
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from math import sin, cos, pi
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@cocotb.test()
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async def test_new_cordic(dut):
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"""Test that cordic matches sin"""
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await cocotb.start(Clock(dut.i_clk, 10, units='ps').start())
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diff = 0
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for cycle in range(0, 65536):
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dut.i_saw.value = cycle
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await Timer(20, units='ps')
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e_sin = 32768 * (sin((cycle * pi) / (2**15)) + 1)
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error = float(dut.o_sin.value) - e_sin
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if abs(error) > 2:
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dut._log.info("cycle %5d, rev %d, inv %d, expected %5d, got %5d, error %+.6f"
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% (cycle, (cycle & 0x4000) != 0, (cycle & 0x8000) != 0, e_sin, dut.o_sin.value, error))
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diff += abs(error)
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dut._log.info("Testbench finished, average error %f" % (diff / 65536))
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