Hi, many thanks for the codes you posted. However, there's a slight bump in my project that I can't seem to hurdle over and I would greatly appreciate if anyone could point out the mistakes I did.
What I am doing is actually controlling an RC car using FPGA. So, I connect the hardware as shown in this website :
http://www.jbprojects.net/articles/rc/ From the controller to the board, I decided to use header, which is where I had problems with. I wrote the code with a simple thought of logic, but I don't know if I wrote it wrongly somewhere. This is the code I came up with
--- Quote Start ---
input [4:0] KEY;
output [19:0] GPIO_0;
assign GPIO_0[10] = KEY[0];
assign GPIO_0[12] = KEY[1];
assign GPIO_0[14] = KEY[2];
assign GPIO_0[16] = KEY[3];
--- Quote End ---
Forgive me if I am making any obvious mistakes. This is written in such a way that when the KEY is pressed, it will send a bit to the respective header pins. However, when I program it into the DE2, the header pins are '1' even when I did not press any of the KEYs.
My friend and I tried another method, but was flooded with errors. The following is the code
--- Quote Start ---
input [4:0] KEY;
output [19:0] GPIO_0;
GPIO_0[10] = 1'b0;
GPIO_0[12] = 1'b0;
GPIO_0[14] = 1'b0;
GPIO_0[16] = 1'b0;
if(KEY[0]==1 && KEY[1]==1 && KEY[2]==1 && KEY[3]==1) begin
GPIO_0[10] = 1'b0;
GPIO_0[12] = 1'b0;
GPIO_0[14] = 1'b0;
GPIO_0[16] = 1'b0;
end
else begin
if (!KEY[0])
GPIO_0[10]=1'b1;
if (!KEY[1])
GPIO_0[12]=1'b1;
if (!KEY[2])
GPIO_0[14]=1'b1;
if (!KEY[3])
GPIO_0[16]=1'b1;
end
--- Quote End ---
I hope someone can point out my mistakes if there are any. I get errors like
--- Quote Start ---
Error (10170): Verilog HDL syntax error at division.v(28) near text ")"; expecting ".", or an identifier
--- Quote End ---
but I am not very sure how to tackle this problem. Help? :(
Many thanks in advance for the time and help
Honored Contributor
