mirror of https://github.com/YosysHQ/picorv32.git
Add rs232 decode to picosoc hx8kdemo test bench
Signed-off-by: Clifford Wolf <clifford@clifford.at>
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@ -23,6 +23,9 @@ module testbench;
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reg clk;
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always #5 clk = (clk === 1'b0);
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localparam ser_half_period = 53;
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event ser_sample;
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initial begin
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$dumpfile("testbench.vcd");
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$dumpvars(0, testbench);
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@ -34,8 +37,17 @@ module testbench;
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$finish;
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end
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integer cycle_cnt = 0;
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always @(posedge clk) begin
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cycle_cnt <= cycle_cnt + 1;
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end
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wire [7:0] leds;
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wire ser_rx;
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wire ser_tx;
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wire flash_csb;
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wire flash_clk;
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wire flash_io0;
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@ -50,6 +62,8 @@ module testbench;
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hx8kdemo uut (
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.clk (clk ),
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.leds (leds ),
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.ser_rx (ser_rx ),
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.ser_tx (ser_tx ),
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.flash_csb(flash_csb),
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.flash_clk(flash_clk),
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.flash_io0(flash_io0),
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@ -66,4 +80,29 @@ module testbench;
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.io2(flash_io2),
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.io3(flash_io3)
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);
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reg [7:0] buffer;
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always begin
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@(negedge ser_tx);
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repeat (ser_half_period) @(posedge clk);
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-> ser_sample; // start bit
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repeat (8) begin
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repeat (ser_half_period) @(posedge clk);
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repeat (ser_half_period) @(posedge clk);
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buffer = {ser_tx, buffer[7:1]};
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-> ser_sample; // data bit
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end
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repeat (ser_half_period) @(posedge clk);
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repeat (ser_half_period) @(posedge clk);
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-> ser_sample; // stop bit
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if (buffer < 32 || buffer >= 127)
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$display("Serial data: %d", buffer);
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else
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$display("Serial data: '%c'", buffer);
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end
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endmodule
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