Refactor distance data type from 15 bits to 9 bits in ultrasonic_fpga module and update related testbench for consistency

Semaine 1/Ultrasonic/tb_ultrasonic_fpga.v

@@ -7,7 +7,7 @@ module tb_ultrasonic_fpga;
     reg start = 0;
     reg echo = 0;
     wire trig_out;
-    wire [15:0] distance;
+    wire [8:0] distance;
 
     time t_start, t_end;
 

Semaine 1/Ultrasonic/ultrasonic_fpga.v

@@ -6,7 +6,7 @@ module ultrasonic_fpga #(
     input wire start,           // signal de declenchement 
     input wire echo,            // retour du capteur
     output reg trig_out,        // signal envoye au capteur
-    output reg [15:0] distance  // distance mesuree
+    output reg [8:0] distance  // distance mesuree
 );
 
     reg [2:0] state;