Add a check to make sure driver enable is set

rtl/tb/drv8353_spi_tb.v

@@ -83,7 +83,7 @@ always @(posedge drv_cs_n) begin
 end
 
 always @(negedge drv_sck) begin
-  if (spi_active) begin
+  if (drv_en & spi_active) begin
     cfg[cfg_num] <= cfg[cfg_num] << 1 | drv_sdi;
     bit_count <= bit_count + 1;
   end
@@ -116,7 +116,7 @@ initial begin
   $dumpvars;
 
   for (i = 0; i < 5; i += 1) cfg[i] = 0;
-  // TODO cycle the module long enough to get all the configuration bits
+  // cycle the module long enough to get all the configuration bits
   // written out, and check to see if it worked correctly
   i = 0;