adjust speaker volume

Author: edanuff

boards/a2n20v2/hdl/top.sv

@@ -481,7 +481,7 @@ module top #(
     // audio that is added to it.
 
 
-    reg [7:0] speaker_audio;
+    reg [6:0] speaker_audio;
     reg [7:0] speaker_audio_counter;
     reg prev_speaker_bit;
 
@@ -496,39 +496,26 @@ module top #(
 
             if ((speaker_audio_counter != 0) && (APPLE_SPEAKER_ENABLE | sw_apple_speaker_w)) begin
                 if (speaker_bit) begin
-                    speaker_audio <= speaker_audio != 8'd127 ? speaker_audio + 8'd1 : 8'd127;
+                    speaker_audio <= speaker_audio != 7'd127 ? speaker_audio + 7'd1 : 7'd127;
                 end else begin
-                    speaker_audio <= speaker_audio != 8'd0 ? speaker_audio - 8'd1 : 8'd0;
+                    speaker_audio <= speaker_audio != 7'd0 ? speaker_audio - 7'd1 : 7'd0;
                 end
             end else begin
-                speaker_audio <= speaker_audio != 8'd0 ? speaker_audio - 8'd1 : 8'd0;
+                speaker_audio <= speaker_audio != 7'd0 ? speaker_audio - 7'd1 : 7'd0;
             end
         end
     end
 
-    /*
-    reg [7:0] speaker_audio;
-    always_ff @(posedge clk_pixel_w) begin
-        if (clk_audio_r) begin
-            if (speaker_bit) begin
-                speaker_audio <= speaker_audio != 8'd127 ? speaker_audio + 8'd1 : 8'd127;
-            end else begin
-                speaker_audio <= speaker_audio != 8'd0 ? speaker_audio - 8'd1 : 8'd0;
-            end
-        end
-    end
-    */
-
     ////
     logic [2:0] tmds;
     wire tmdsClk;
 
     //wire [15:0] sample = {ssp_psg_mix_audio_o, 2'b00};
     reg [15:0] audio_sample_word[1:0], audio_sample_word0[1:0];
     always @(posedge clk_pixel_w) begin  // crossing clock domain
-        audio_sample_word0[0] <= ssp_audio_w + {mb_audio_l, 4'b00} + {speaker_audio, 8'b0};
+        audio_sample_word0[0] <= ssp_audio_w + {mb_audio_l, 4'b00} + {2'b0, speaker_audio, 7'b0};
         audio_sample_word[0]  <= audio_sample_word0[0];
-        audio_sample_word0[1] <= ssp_audio_w + {mb_audio_r, 4'b00} + {speaker_audio, 8'b0};
+        audio_sample_word0[1] <= ssp_audio_w + {mb_audio_r, 4'b00} + {2'b0, speaker_audio, 7'b0};
         audio_sample_word[1]  <= audio_sample_word0[1];
     end