DEO-NANO rolling ADC

Hello,

I''m pretty new to VHDL and I'm trying to get the DE0-NANO to poll inputs 0-3 and send the data to 4 12 bit registers. I have tried it a numebr of ways but it either didn't work or had some sort of interference. Can anyone help?

Here is my code that was based on the DE0-NANO example.

module ADC_CTRL (

//

iCLK,

iCLK_n,

oCH0,

oCH1,

oCH2,

oCH3,

oDIN,

oCS_n,

oSCLK,

oCH,

iDOUT

);

input iCLK;

input iCLK_n;

output [11:0] oCH0;

output [11:0] oCH1;

output [11:0] oCH2;

output [11:0] oCH3;

output [1:0] oCH;

output oDIN;

output oCS_n;

output oSCLK;

input iDOUT;

reg data =0; // serial address data out

reg go_en=1;

wire [1:0] ch_sel= 2'b10;

reg sclk;

reg [3:0] cont;

reg [3:0] m_cont;

reg [11:0] adc_data;

reg [11:0] ch0;

reg [11:0] ch1;

reg [11:0] ch2;

reg [11:0] ch3;

assign oCS_n = ~go_en;

assign oSCLK = (go_en)? iCLK:1;

assign oDIN = data;

assign oCH0 = ch0;

assign oCH1 = ch1;

assign oCH2 = ch2;

assign oCH3 = ch3;

assign oCH = ch_sel;

// always@(posedge iGO )

// begin

// if(!iRST)

// go_en <= 0;

// else

// begin

// if(iGO)

// go_en <= 1;

// end

//end

always@(posedge iCLK )

//begin

// if(!go_en)

// cont <= 0;

// else

begin

if(iCLK)

cont <= cont + 1'b1;

end

//end

always@(posedge iCLK_n)

begin

if(iCLK_n)

m_cont <= cont;

end

always@(posedge iCLK_n )

//begin

// if(!go_en)

// data <= 0;

// else

begin

if(iCLK_n)

begin

if (cont == 2)

data <= 0;

else if (cont == 3)

data <= ch_sel[1];

else if (cont == 4)

data <= ch_sel[0];

else

data <= 0;

end

end

//end

always@(posedge iCLK)

begin

if(!go_en)

begin // will never get run

adc_data <= 0;

ch0 <= 12'h000;

ch1 <= 12'h000;

ch2 <= 12'h000;

ch3 <= 12'h000;

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)

begin

case (ch_sel)

2'b00 : ch0 <= adc_data;

2'b01 : ch1 <= adc_data;

2'b10 : ch2 <= adc_data;

2'b11 : ch3 <= adc_data;

endcase

// ch_sel = ch_sel + 2'b01;

end

end

end

end

endmodule