add FIFO files

write_pointer.v

@@ -0,0 +1,19 @@
+module write_pointer(
+    output  [4:0]   wptr,
+    output          fifo_we,
+    input           wr,
+    input           fifo_full,
+    input           clk,
+    input           rst_n);  
+
+    assign fifo_we = (~fifo_full)   &  wr;  
+
+    always @(posedge clk or negedge rst_n)  
+    begin  
+        if(~rst_n) wptr <= 'b0;  
+        else if(fifo_we)  
+            wptr <= wptr + 'b1;  
+        else  
+            wptr <= wptr;  
+    end  
+endmodule