Open Source Hardware
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It sounds like you have bigger plans and an always block is neededYep I do :-)
Would you please share the working solution :)Sure. I tried to make a device which would execute some code on the rising edge of a button press, and some other code on the falling edge. There are some totally noob errors in the code below, and I felt quite stupid after realizing what they were:
module Ledon(clk, led);This code could not be synthesized because of 1 error - "Multi-source in Unit <Ledon> on signal <led>; this signal is connected to multiple drivers.". I also got a warning - "Input <clk> is never used. This port will be preserved and left unconnected if it belongs to a top-level block or it belongs to a sub-block and the hierarchy of this sub-block is preserved."
input clk;
output led;
reg led;
always @(negedge clk)
begin
led=1;
end
always @(posedge clk)
begin
led=0;
end
endmodule
module Ledon(clk, led);Now, once the code is triggered by either edge we check what state 'clk' is in and then perform the appropriate steps.
input clk;
output led;
reg led;
always @(posedge clk or negedge clk)
begin
if (clk) begin
led<= 0;
end else begin
led<=1;
end
end
endmodule
module Ledon(clk, led);
input clk;
output led;
reg led;
always @(negedge clk)
begin
led=1;
end
always @(posedge clk)
begin
led=0;
end
endmodule
...Input <clk> is never used..... Why? I know this is not the best way to go about turning on and off an LED - my end goal is different (I basically want to perform a task on both clock edges) - I've stripped down my code to the bare essentials for easy readability.
I updated your url, and we'll run this on the blog next week.Cool! Here's what the top of the board looks like:[attachment=0]Right angled pin headers on the left, an LP2950-3.3 regulator to power the BP, a PIC24, and a 10uF capacitor.