【iCore4 双核心板_FPGA】例程三：计数器实验——计数器使用

//--------------------module_counter_ctrl--------------------//
module counter_ctrl (
input clk_25m,
input rst_n,
output fpga_ledg
);
//--------------------counter_ctrl--------------------------//
/*计数器控制绿色led闪烁*/
reg [24:0]cnt;
reg ledg;

always@(posedge clk_25m or negedge rst_n)
if(!rst_n)
begin
ledg <= 1'd1;
cnt <= 25'd0;
end
else if(cnt == 25'd5000000)
begin
ledg <= ~ledg;
cnt <= 25'd0;
end
else
cnt <= cnt + 1'd1;

assign fpga_ledg = ledg;

//--------------------endmodule-----------------------------//
endmodule