module mojo_top(
    // 50MHz clock input
    input clk,
    // Input from reset button (active low)
    input rst_n,
    // cclk input from AVR, high when AVR is ready
    input cclk,
    // Outputs to the 8 onboard LEDs
    output[7:0]led,
    // AVR SPI connections
    output spi_miso,
    input spi_ss,
    input spi_mosi,
    input spi_sck,
    // AVR ADC channel select
    output [3:0] spi_channel,
    // Serial connections
    input avr_tx, // AVR Tx => FPGA Rx
    output avr_rx, // AVR Rx => FPGA Tx
    input avr_rx_busy, // AVR Rx buffer full
    output[3:0] hdmi1_tmds,
    output[3:0] hdmi1_tmdsb
  );
  
  wire rst = ~rst_n; // make reset active high
  
  wire hdmi_clk;
  
  reg[7:0] hdmired, hdmigreen, hdmiblue;
  wire[10:0] hdmix;
  wire[9:0] hdmiy;
  
  reg[7:0] frame_q, frame_d;
  
  clk_wiz_v3_6 clk_wiz(
    .CLK_IN1(clk),
    .CLK_OUT1(hdmi_clk)
  );
  
  hdmi_encoder hdmi(
    .clk(hdmi_clk),
    .rst(rst),
    .tmds(hdmi1_tmds),
    .tmdsb(hdmi1_tmdsb),
    .x(hdmix),
    .y(hdmiy),
    .red(hdmired),
    .green(hdmigreen),
    .blue(hdmiblue)
  );
  
  // these signals should be high-z when not used
  assign spi_miso = 1'bz;
  assign avr_rx = 1'bz;
  assign spi_channel = 4'bzzzz;
  
  assign led[6:0] = 7'b1000000;
  assign led[7] = char_index_q;
  
  wire [7:0] char_data [7:0][7:0];
  
  assign char_data[0][0] = 8'b00000000;
  assign char_data[0][1] = 8'b00000000;
  assign char_data[0][2] = 8'b00111000;
  assign char_data[0][3] = 8'b01101100;
  assign char_data[0][4] = 8'b01101100;
  assign char_data[0][5] = 8'b01111100;
  assign char_data[0][6] = 8'b01101100;
  assign char_data[0][7] = 8'b01101100;
  
  assign char_data[1][0] = 8'b00000000;
  assign char_data[1][1] = 8'b00000000;
  assign char_data[1][2] = 8'b01111000;
  assign char_data[1][3] = 8'b01101100;
  assign char_data[1][4] = 8'b01111000;
  assign char_data[1][5] = 8'b01101100;
  assign char_data[1][6] = 8'b01101100;
  assign char_data[1][7] = 8'b01111000;
  
  assign char_data[2][0] = 8'b00000000;
  assign char_data[2][1] = 8'b00000000;
  assign char_data[2][2] = 8'b00111000;
  assign char_data[2][3] = 8'b01101100;
  assign char_data[2][4] = 8'b01100000;
  assign char_data[2][5] = 8'b01100000;
  assign char_data[2][6] = 8'b01101100;
  assign char_data[2][7] = 8'b00111000;
  
  assign char_data[3][0] = 8'b00000000;
  assign char_data[3][1] = 8'b00000000;
  assign char_data[3][2] = 8'b01111000;
  assign char_data[3][3] = 8'b01101100;
  assign char_data[3][4] = 8'b01101100;
  assign char_data[3][5] = 8'b01101100;
  assign char_data[3][6] = 8'b01101100;
  assign char_data[3][7] = 8'b01111000;
  
  assign char_data[4][0] = 8'b00000000;
  assign char_data[4][1] = 8'b00000000;
  assign char_data[4][2] = 8'b00111100;
  assign char_data[4][3] = 8'b01100000;
  assign char_data[4][4] = 8'b01111000;
  assign char_data[4][5] = 8'b01100000;
  assign char_data[4][6] = 8'b01100000;
  assign char_data[4][7] = 8'b00111100;
  
  assign char_data[5][0] = 8'b00000000;
  assign char_data[5][1] = 8'b00000000;
  assign char_data[5][2] = 8'b00111100;
  assign char_data[5][3] = 8'b01100000;
  assign char_data[5][4] = 8'b01111000;
  assign char_data[5][5] = 8'b01100000;
  assign char_data[5][6] = 8'b01100000;
  assign char_data[5][7] = 8'b01100000;
  
  assign char_data[6][0] = 8'b00000000;
  assign char_data[6][1] = 8'b00000000;
  assign char_data[6][2] = 8'b00111100;
  assign char_data[6][3] = 8'b01100000;
  assign char_data[6][4] = 8'b01100000;
  assign char_data[6][5] = 8'b01101100;
  assign char_data[6][6] = 8'b01101100;
  assign char_data[6][7] = 8'b00111100;
  
  assign char_data[7][0] = 8'b00000000;
  assign char_data[7][1] = 8'b00000000;
  assign char_data[7][2] = 8'b01101100;
  assign char_data[7][3] = 8'b01101100;
  assign char_data[7][4] = 8'b01111100;
  assign char_data[7][5] = 8'b01101100;
  assign char_data[7][6] = 8'b01101100;
  assign char_data[7][7] = 8'b01101100;
  
  //assign char_data[2][0] = 8'b00000000;
  //assign char_data[2][1] = 8'b00000000;
  //assign char_data[2][2] = 8'b00000000;
  //assign char_data[2][3] = 8'b00000000;
  //assign char_data[2][4] = 8'b00000000;
  //assign char_data[2][5] = 8'b00000000;
  //assign char_data[2][6] = 8'b00000000;
  //assign char_data[2][7] = 8'b00000000;
  
  reg[2:0] char_index_q, char_index_d;
  
  always @(*) begin
    //hdmired = hdmix[7:0] + frame_q;
    //hdmigreen = hdmiy[7:0] + frame_q;
    //hdmiblue = hdmix[7:0] ^ hdmiy[7:0];
    
    hdmired = 1'h28;
    hdmigreen = 1'h28;
    hdmiblue = 1'h28;
    
    if (char_data[char_index_q][(hdmiy >> 1) % 8][7 - ((hdmix >> 1) % 8)] == 1) begin
      hdmired = 8'hEB;
      hdmigreen = 8'hDB;
      hdmiblue = 8'hB2;
    end
    
    frame_d = frame_q;
    char_index_d = (hdmix >> 4) % 8;
    
    if (hdmix == 1279 && hdmiy == 719) begin
      frame_d = frame_q + 1'b1;
    end
  end
  
  always @(posedge hdmi_clk) begin
    if (rst) begin
      frame_q <= 1'b0;
      char_index_q <= 1'b0;
    end else begin
      frame_q <= frame_d;
      char_index_q <= char_index_d;
    end
  end
  
endmodule