Hello friends.. I am trying to write verilog code for sine pwm. please check the below code and tell whether it will work or not. thank you.
module sine_cos(clock, reset, en, sine, cos);
input clock, reset, en;
output [7:0] sine,cos;
reg [7:0] sine_r, cos_r;
assign sine = sine_r + {cos_r[7], cos_r[7], cos_r[7], cos_r[7:3]};
assign cos = cos_r - {sine[7], sine[7], sine[7], sine[7:3]};
always@(posedge clock or negedge reset)
begin
if (!reset) begin
sine_r <= 0;
cos_r <= 120;
end else begin
if (en) begin
sine_r <= sine;
cos_r <= cos;
end
end
end
endmodule
module triangle(clock, reset, triangle);
input clock, reset;
output[7:0] triangle;
reg[7:0] triangle;
reg[7:0] counter;
reg[7:0] updown;
always@(posedge clock or negedge reset)
begin
if(reset) begin
counter <= -125;
updown <= 0;
end
else if (rising_edge(clock))
begin
if (updown == 0)
if (counter < 125)
begin
counter <= counter + 5;
end
if (counter == 120)
begin
updown <= 1;
end
else if (updown == 1)
if (counter >-125)
begin
counter <= counter - 5;
end
if (counter == -120)
begin
updown <= 0;
end
end
end
always@(posedge clock or negedge reset)
begin
if(reset) begin
triangle <= counter;
end
end
endmodule
module PWM(triangle, cos, pwm, clock);
input triangle, cos, clock;
output pwm;
reg pwm;
reg [15:0] counter = 0;
always @ (posedge clock)
begin
if (cos >= triangle) pwm = 1;
else pwm = 0;
end
endmodule
