Hi everyone,

I recently got a Glasgow to play with and it has been super cool so far. I have been experimenting with the spi-controller applet to read data from microSD cards. I'm really impressed how easy it is to get something up and running with just a little bit of Python code.

While using the default applets is fun, I also wanted to experiment with building some custom gateware. The idea is to move some of the sending a byte and checking the response from the Python code to the gateware to reduce the latency. So, I took the spi-controller applet and added in some extra commands. But when testing the gateware the FSM seems to get stuck after only sending a single byte. To get some more insight in what was going on, I decided to add a simulation test so I could look at all the signals. To my surprise the FSM just worked correctly in the simulation.

My guess is that there is a subtle difference in how the SPI controller gateware works in simulation and on the hardware, but I can't figure out what the exact problem is. I have included a snippet of code for the state which gets stuck. This is part of a component which is basically identical to the SPIControllerComponent.

```
with m.State("Command-Wait-For-Ready"):
    m.d.comb += [
        ctrl.i_stream.p.chip.eq(chip),
        ctrl.i_stream.p.mode.eq(spi.Mode.Swap),
        ctrl.i_stream.p.data.eq(0xFF),
    ]

    with m.If(should_tx):
        m.d.comb += ctrl.i_stream.valid.eq(1)
        with m.If(ctrl.i_stream.valid & ctrl.i_stream.ready):
            m.d.sync += should_tx.eq(0)

    with m.If(i_count != 0):
        m.d.comb += ctrl.o_stream.ready.eq(1)
        with m.If(ctrl.o_stream.valid & ctrl.o_stream.ready):
            m.d.sync += i_count.eq(i_count - 1)
            with m.If(i_count > 1):
                m.d.sync += should_tx.eq(1)

    with m.If(i_count == 0):
        m.d.sync += o_count.eq(6)
        m.next = "Command-Transmit"
```

I have also attached two screenshots, one of the simulation, which looks to be working correctly, and one of the logic analyzer output when attached to the hardware.

I hope that someone can spot where I'm making a mistake, and if any more information is needed please let me know.