tristateSignal_example2.py

from myhdl import Signal, TristateSignal, block, instance, delay, always_comb, always_seq


@block
def foo(clk, iopin):
    
    tri = Signal(bool(0))
    iopindriver = iopin.driver()
    """
    @always_comb
    def statedriver():
        iopindriver.next = clk if tri else None
    """
    @always_seq(clk.posedge, reset=None)
    def seqdriver1():
        iopindriver.next = False
    
    @always_seq(clk.negedge, reset=None)
    def seqdriver2():
        iopindriver.next = True
    """
    @instance
    def statechange():
        while True:
            iopindriver.next = False 
            # tri.next = False
            yield delay(50)  # can implement clkwait as you said
            iopindriver.next = True
            # tri.next = True
            yield delay(50)  # can implement clkwait as you said
    """     
    return seqdriver1, seqdriver2 #statedriver,statechange,  


@block
def test_foo():
    
    clk = Signal(bool(0))
    iopin = TristateSignal(bool(0))
    fooinst = foo(clk, iopin)
    
    @instance
    def clkdriver():
        while True:
            clk.next = not clk
            yield delay(10)
    
    return clkdriver, fooinst

testfooinst = test_foo()
testfooinst.config_sim(trace=True)
testfooinst.run_sim(duration=1000)