mojo_hdmi_demo_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
    inout hdmi1_sda,
    input hdmi1_scl,
    output hdmi1_tmds[4],
    output hdmi1_tmdsb[4]
    //output hdmi2_tmds[4],
    //output hdmi2_tmdsb[4]
  ) {
  
  sig rst;                  // reset signal
  
  clk_gen clk_gen(.CLK_IN(clk));
  
  hdmi_encoder hdmi (.clk(clk_gen.CLK_OUT), .rst(rst));
  
  .clk(hdmi.pclk) {
    // 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){
      // the avr_interface module is used to talk to the AVR for access to the USB port and analog pins
      avr_interface avr;
      
      edid_rom edid_rom(.sda(hdmi1_sda), .scl(hdmi1_scl));
      dff ctr[64];
    }
  }
  
  always {
    reset_cond.in = ~rst_n;            // input raw inverted reset signal
    rst = reset_cond.out;              // conditioned reset
    
    // connect inputs of avr
    avr.cclk = cclk;
    avr.spi_ss = spi_ss;
    avr.spi_mosi = spi_mosi;
    avr.spi_sck = spi_sck;
    avr.rx = avr_tx;
    avr.channel = hf;                  // ADC is unused so disable
    avr.tx_block = avr_rx_busy;        // block TX when AVR is busy
    
    // connect outputs of avr
    spi_miso = avr.spi_miso;
    spi_channel = avr.spi_channel;
    avr_rx = avr.tx;
    avr.tx_data = 8hx;
    avr.new_tx_data = 0;
    
    led = 0;                           // turn off the LEDs
    
    hdmi.red = hdmi.x[7:0] + ctr.q;
    hdmi.blue = hdmi.y[7:0] + (ctr.q << 1);
    hdmi.green = hdmi.x[7:0] + hdmi.y[7:0];
    
    hdmi1_tmds = hdmi.tmds;
    hdmi1_tmdsb = hdmi.tmdsb;
    
    if(hdmi.x == 1279 && hdmi.y == 719 && hdmi.active) {
      ctr.d = ctr.q + 1;
    }
  }
}