[moved] ADC in DEO_NANO board

module ADC_CTRL  (  
          iRST,
          iCLK,
          iCLK_n,
          iGO,
          iCH,
          oLED,
          
          oDIN,
          oCS_n,
          oSCLK,
          iDOUT
        );
          
input        iRST;
input        iCLK;
input        iCLK_n;
input        iGO;
input  [2:0]    iCH;
output  [7:0]    oLED;

output        oDIN;
output        oCS_n;
output        oSCLK;
input        iDOUT;

reg          data;
reg          go_en;
wire  [2:0]    ch_sel;
reg          sclk;
reg    [3:0]    cont;
reg    [3:0]    m_cont;
reg    [11:0]    adc_data;
reg    [7:0]    led;

assign  oCS_n    =  ~go_en;
assign  oSCLK    =  (go_en)? iCLK:1;
assign  oDIN    =  data;
assign  ch_sel    =  iCH;
assign  oLED    =  led;

always@(posedge iGO or negedge iRST)
begin
  if(!iRST)
    go_en  <=  0;
  else
  begin
    if(iGO)
      go_en  <=  1;
  end
end

always@(posedge iCLK or negedge go_en)
begin
  if(!go_en)
    cont  <=  0;
  else
  begin
    if(iCLK)
      cont  <=  cont + 1;
  end
end

always@(posedge iCLK_n)
begin
  if(iCLK_n)
    m_cont  <=  cont;
end

always@(posedge iCLK_n or negedge go_en)
begin
  if(!go_en)
    data  <=  0;
  else
  begin
    if(iCLK_n)
    begin
      if (cont == 2)
        data  <=  iCH[2];
      else if (cont == 3)
        data  <=  iCH[1];
      else if (cont == 4)
        data  <=  iCH[0];
      else
        data  <=  0;
    end
  end
end

always@(posedge iCLK or negedge go_en)
begin
  if(!go_en)
  begin
    adc_data  <=  0;
    led      <=  8'h00;
  end
  else
  begin
    if(iCLK)
    begin
      if (m_cont == 4)
        adc_data[11]  <=  iDOUT;
      else if (m_cont == 5)
        adc_data[10]  <=  iDOUT;
      else if (m_cont == 6)
        adc_data[9]    <=  iDOUT;
      else if (m_cont == 7)
        adc_data[8]    <=  iDOUT;
      else if (m_cont == 8)
        adc_data[7]    <=  iDOUT;
      else if (m_cont == 9)
        adc_data[6]    <=  iDOUT;
      else if (m_cont == 10)
        adc_data[5]    <=  iDOUT;
      else if (m_cont == 11)
        adc_data[4]    <=  iDOUT;
      else if (m_cont == 12)
        adc_data[3]    <=  iDOUT;
      else if (m_cont == 13)
        adc_data[2]    <=  iDOUT;
      else if (m_cont == 14)
        adc_data[1]    <=  iDOUT;
      else if (m_cont == 15)
        adc_data[0]    <=  iDOUT;
      else if (m_cont == 1)
        led  <=  adc_data[11:4];
    end
  end
end

endmodule