mojo_top.luc

module mojo_top (
    input clk,              // 50MHz clock
    input rst_n,            // reset button (active low)
    output led [8],         // 8 user controllable LEDs
    input cclk,             // configuration clock, AVR ready when high
    output spi_miso,        // AVR SPI MISO
    input spi_ss,           // AVR SPI Slave Select
    input spi_mosi,         // AVR SPI MOSI
    input spi_sck,          // AVR SPI Clock
    output spi_channel [4], // AVR general purpose pins (used by default to select ADC channel)
    input avr_tx,           // AVR TX (FPGA RX)
    output avr_rx,          // AVR RX (FPGA TX)
    input avr_rx_busy,      // AVR RX buffer full
    output a,                //input 1
    output b,                //input 2
    output c,                //carryin
    input out1,             //sum
    input out2              //carryout
  ) {
  
  sig rst;                  // reset signal
  
  .clk(clk) {
    // The reset conditioner is used to synchronize the reset signal to the FPGA
    // clock. This ensures the entire FPGA comes out of reset at the same time.
    reset_conditioner reset_cond;
    
    .rst(rst){
      fsm state = {ZEROZEROZERO,ZEROZEROONE,ZEROONEZERO,ONEZEROZERO,ZEROONEONE,ONEZEROONE,ONEONEZERO,ONEONEONE};
      evaluation evaluater;
      blinker alternator;
    }
  }
  
  always {
    a = 0;
    b = 0;
    c = 0;  
    evaluater.a = 0;
    evaluater.b = 0;
    evaluater.c = 0;  
    case(state.q){
      state.ZEROZEROZERO:
        a = 0;
        b = 0;
        c = 0;
        evaluater.a = 0;
        evaluater.b = 0;
        evaluater.c = 0;
        led[0] = 0;
        led[1] = 0;
        led[2] = 0;
        if(alternator.a==1){
          state.d=state.ZEROZEROONE;
        }
      state.ZEROZEROONE:
        a = 1;
        b = 0;
        c = 0;  
        evaluater.a = 1;
        evaluater.b = 0;
        evaluater.c = 0;
        led[0] = 1;
        led[1] = 0;
        led[2] = 0;
        if(alternator.a==0){
          state.d=state.ZEROONEZERO;
        }
      state.ZEROONEZERO:
        a = 0;
        b = 1;
        c = 0;
        evaluater.a = 0;
        evaluater.b = 1;
        evaluater.c = 0;
        led[0] = 0;
        led[1] = 1;
        led[2] = 0;
        if(alternator.a==1){
          state.d=state.ONEZEROZERO;
        }
      state.ONEZEROZERO:
        a = 0;
        b = 0;
        c = 1;
        evaluater.a = 0;
        evaluater.b = 0;
        evaluater.c = 1;
        led[0] = 0;
        led[1] = 0;
        led[2] = 1;
        if(alternator.a==0){
          state.d=state.ZEROONEONE;
        }
      state.ZEROONEONE:
        a = 1;
        b = 1;
        c = 0;
        evaluater.a = 1;
        evaluater.b = 1;
        evaluater.c = 0;
        led[0] = 1;
        led[1] = 1;
        led[2] = 0;
        if(alternator.a==1){
          state.d=state.ONEZEROONE;
        }
      state.ONEZEROONE:
        a = 1;
        b = 0;
        c = 1;
        evaluater.a = 1;
        evaluater.b = 0;
        evaluater.c = 1;
        led[0] = 1;
        led[1] = 0;
        led[2] = 1;
        if(alternator.a==0){
          state.d=state.ONEONEZERO;
        }
      state.ONEONEZERO:
        a = 0;
        b = 1;
        c = 1;
        evaluater.a = 0;
        evaluater.b = 1;
        evaluater.c = 1;
        led[0] = 0;
        led[1] = 1;
        led[2] = 1;
        if(alternator.a==1){
          state.d=state.ONEONEONE;
        }
      state.ONEONEONE:
        a = 1;
        b = 1;
        c = 1;
        evaluater.a = 1;
        evaluater.b = 1;
        evaluater.c = 1;
        led[0] = 1;
        led[1] = 1;
        led[2] = 1;
        if(alternator.a==0){
          state.d=state.ZEROZEROZERO;
        }
    }

    reset_cond.in = ~rst_n; // input raw inverted reset signal
    rst = reset_cond.out;   // conditioned reset
    led[3] = out1;
    led[4] = out2;
    led[5] = evaluater.fpgasum;
    led[6] = evaluater.fpgacarry;
    led[7] = (evaluater.fpgasum==out1)&(evaluater.fpgacarry==out2);

    spi_miso = bz;          // not using SPI
    spi_channel = bzzzz;    // not using flags
    avr_rx = bz;            // not using serial port
  }
}