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module top(
output RGB0, RGB1, RGB2
);
wire clk;
SB_HFOSC inthosc (
.CLKHFPU(1'b1),
.CLKHFEN(1'b1),
.CLKHF(clk)
);
localparam counter_width = 30;
reg [counter_width-1:0] ctr;
always@(posedge clk)
begin
ctr <= ctr + 1;
end
localparam pwm_width = 12;
localparam pwm_max = (2**pwm_width) - 1;
localparam pwm_max_div4 = (2**(pwm_width-2)) - 1;
wire [1:0] phase = ctr[counter_width - 1 : counter_width - 2];
wire [pwm_width-1:0] fade = ctr[counter_width - 3 : counter_width - (2 + pwm_width)];
wire [pwm_width-1:0] fade_div4 = ctr[counter_width - 3 : counter_width - (pwm_width)];
wire [pwm_width-1:0] r_val, g_val, b_val;
// Fade R->G->B->W->
assign r_val = (phase == 0) ? pwm_max_div4 + (3 * fade_div4) :
(phase == 1) ? pwm_max - fade :
(phase == 3) ? fade_div4 :
0;
assign g_val = (phase == 0) ? pwm_max_div4 - fade_div4:
(phase == 1) ? fade :
(phase == 2) ? pwm_max - fade :
(phase == 3) ? fade_div4 :
0;
assign b_val = (phase == 0) ? pwm_max_div4 - fade_div4:
(phase == 2) ? fade :
(phase == 3) ? pwm_max - (3 * fade_div4) :
0;
reg [pwm_width-1:0] pwm_ctr;
reg pwm_r, pwm_g, pwm_b;
always@(posedge clk)
begin
pwm_ctr <= pwm_ctr + 1;
pwm_r <= (pwm_ctr < r_val) ? 1'b1 : 1'b0;
pwm_g <= (pwm_ctr < g_val) ? 1'b1 : 1'b0;
pwm_b <= (pwm_ctr < b_val) ? 1'b1 : 1'b0;
end
SB_RGBA_DRV RGBA_DRIVER (
.CURREN(1'b1),
.RGBLEDEN(1'b1),
.RGB0PWM(pwm_g),
.RGB1PWM(pwm_b),
.RGB2PWM(pwm_r),
.RGB0(RGB0),
.RGB1(RGB1),
.RGB2(RGB2)
);
defparam RGBA_DRIVER.CURRENT_MODE = "0b1";
defparam RGBA_DRIVER.RGB0_CURRENT = "0b000001";
defparam RGBA_DRIVER.RGB1_CURRENT = "0b000011";
defparam RGBA_DRIVER.RGB2_CURRENT = "0b000011";
endmodule
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