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implement hex->ascii conversion with a table

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Raphaël Jacquot 2019-03-03 06:57:14 +01:00
parent 182623e043
commit 006b663147
1 changed files with 32 additions and 6 deletions
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38
saturn_debugger.v
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@ -71,19 +71,40 @@ wire [0:0] debug_done;
assign debug_done = registers_done;
reg [8:0] registers_ctr;
reg [7:0] registers_str[0:511];
reg [4:0] registers_state;
reg [4:0] registers_reg_ptr;
reg [0:0] registers_done;
reg [7:0] hex[0:15];
reg [8:0] registers_ctr;
reg [7:0] registers_str[0:511];
reg [4:0] registers_state;
reg [4:0] registers_reg_ptr;
reg [0:0] registers_done;
reg [19:0] pc;
initial begin
o_debug_cycle = 1'b0;
counter = 4'b0;
hex[0] = "0";
hex[1] = "1";
hex[2] = "2";
hex[3] = "3";
hex[4] = "4";
hex[5] = "5";
hex[6] = "6";
hex[7] = "7";
hex[8] = "8";
hex[9] = "9";
hex[10] = "A";
hex[11] = "B";
hex[12] = "C";
hex[13] = "D";
hex[14] = "E";
hex[15] = "F";
registers_ctr = 10'd0;
registers_state = `DBG_REG_PC_STR;
registers_reg_ptr = 5'b0;
registers_done = 1'b0;
pc = 20'h3b45f;
end
/**************************************************************************************************
@ -126,7 +147,12 @@ always @(posedge i_clk) begin
endcase
`DBG_REG_PC_VALUE:
begin
registers_state <= `DBG_REG_END;
registers_str[registers_ctr] <= hex[pc[(4-registers_reg_ptr)*4+:4]];
registers_reg_ptr <= registers_reg_ptr + 1;
if (registers_reg_ptr == 5'd4) begin
registers_reg_ptr <= 5'd0;
registers_state <= `DBG_REG_END;
end
end
`DBG_REG_END: begin end
default: begin $display("ERROR, unknown register state %0d", registers_state); end