310 lines
9.5 KiB
Verilog
310 lines
9.5 KiB
Verilog
module mojo_top(
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// 50MHz clock input
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input clk,
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// Input from reset button (active low)
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input rst_n,
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// cclk input from AVR, high when AVR is ready
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input cclk,
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// Outputs to the 8 onboard LEDs
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output[7:0]led,
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// AVR SPI connections
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output spi_miso,
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input spi_ss,
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input spi_mosi,
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input spi_sck,
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// AVR ADC channel select
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output [3:0] spi_channel,
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// Serial connections
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input avr_tx, // AVR Tx => FPGA Rx
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output avr_rx, // AVR Rx => FPGA Tx
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input avr_rx_busy, // AVR Rx buffer full
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output[3:0] hdmi1_tmds,
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output[3:0] hdmi1_tmdsb,
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input z80_clk,
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input[7:0] z80_data,
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// input[7:0] z80_address,
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input z80_ioreq,
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input z80_wr,
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input z80_m1
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);
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wire rst = ~rst_n; // make reset active high
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wire hdmi_clk;
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reg[7:0] hdmired, hdmigreen, hdmiblue;
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wire[11:0] hdmix;
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wire[10:0] hdmiy;
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reg[7:0] frame_q, frame_d;
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clk_wiz_v3_6 clk_wiz(
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.CLK_IN1(clk),
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.CLK_OUT1(hdmi_clk)
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);
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localparam SCALE = 2;
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localparam WIDTH = 1280;
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localparam HEIGHT = 720;
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// localparam WIDTH = 1920;
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// localparam HEIGHT = 1080;
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localparam CHAR_HMAX = WIDTH / (SCALE*8);
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localparam CHAR_VMAX = HEIGHT / (SCALE*8);
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// @todo 1080p30 does not work for some reason (already extended number of bits)
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hdmi_encoder #(.Y_RES(HEIGHT), .X_RES(WIDTH), .Y_FRAME(HEIGHT+30), .X_FRAME(WIDTH+387)) hdmi(
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// hdmi_encoder #(.Y_RES(HEIGHT), .X_RES(WIDTH), .Y_FRAME(HEIGHT+45), .X_FRAME(WIDTH+303)) hdmi(
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.clk(hdmi_clk),
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.rst(rst),
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.tmds(hdmi1_tmds),
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.tmdsb(hdmi1_tmdsb),
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.x(hdmix),
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.y(hdmiy),
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.red(hdmired),
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.green(hdmigreen),
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.blue(hdmiblue)
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);
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wire [29:0] char_data [94:0];
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assign char_data[0] = 30'h00000000; //
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assign char_data[1] = 30'h1CE7380E; // !
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assign char_data[2] = 30'h14A00000; // "
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assign char_data[3] = 30'hAFABEA; // #
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assign char_data[4] = 30'h8FA38BE; // $
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assign char_data[5] = 30'h19D1173; // %
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assign char_data[6] = 30'h1905324D; // &
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assign char_data[7] = 30'h8400000; // '
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assign char_data[8] = 30'hCC63186; // (
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assign char_data[9] = 30'h186318CC; // )
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assign char_data[10] = 30'h4ABAA4; // *
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assign char_data[11] = 30'h427C84; // +
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assign char_data[12] = 30'h0x8C; // ,
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assign char_data[13] = 30'h3800; // -
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assign char_data[14] = 30'hC; // .
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assign char_data[15] = 30'hC663318; // /
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assign char_data[16] = 30'h3FBDEF7F; // 0
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assign char_data[17] = 30'h3C6318DF; // 1
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assign char_data[18] = 30'h3E3FE31F; // 2
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assign char_data[19] = 30'h3E378C7F; // 3
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assign char_data[20] = 30'h37BF8C63; // 4
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assign char_data[21] = 30'h3F8F8C7F; // 5
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assign char_data[22] = 30'h3F8FEF7F; // 6
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assign char_data[23] = 30'h3E33318C; // 7
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assign char_data[24] = 30'h3FBFEF7F; // 8
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assign char_data[25] = 30'h3FBF8C7F; // 9
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assign char_data[26] = 30'hC00180; // :
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assign char_data[27] = 30'hC00198; // ;
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assign char_data[28] = 30'h666186; // <
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assign char_data[29] = 30'h701C0; // =
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assign char_data[30] = 30'hC30CCC; // >
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assign char_data[31] = 30'h3C31B80C; // ?
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assign char_data[32] = 30'h1D1BDE0F; // @
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assign char_data[33] = 30'h1DBDFF7B; // A
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assign char_data[34] = 30'h3DBF6F7E; // B
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assign char_data[35] = 30'h1DBC636E; // C
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assign char_data[36] = 30'h3DBDEF7E; // D
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assign char_data[37] = 30'h1F8F630F; // E
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assign char_data[38] = 30'h1F8F6318; // F
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assign char_data[39] = 30'h1F8C6F6F; // G
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assign char_data[40] = 30'h37BFEF7B; // H
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assign char_data[41] = 30'h3CC6319E; // I
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assign char_data[42] = 30'h3E6318DC; // J
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assign char_data[43] = 30'h37BE6F7B; // K
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assign char_data[44] = 30'h318C631F; // L
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assign char_data[45] = 30'h37FFEF7B; // M
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assign char_data[46] = 30'h3DBDEF7B; // N
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assign char_data[47] = 30'h1DBDEF6E; // O
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assign char_data[48] = 30'h3DBDFB18; // P
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assign char_data[49] = 30'h1DBDEFCF; // Q
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assign char_data[50] = 30'h3DBDF37B; // R
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assign char_data[51] = 30'h1F870C7E; // S
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assign char_data[52] = 30'h3EC6318C; // T
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assign char_data[53] = 30'h37BDEF6E; // U
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assign char_data[54] = 30'h37BDEDC4; // V
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assign char_data[55] = 30'h37BDFFFB; // W
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assign char_data[56] = 30'h37B26F7B; // X
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assign char_data[57] = 30'h37BF8C7E; // Y
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assign char_data[58] = 30'h3E33331F; // X
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assign char_data[59] = 30'h1CC6318E; // [
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assign char_data[60] = 30'h18C31863; // \
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assign char_data[61] = 30'h1C6318CE; // ]
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assign char_data[62] = 30'h8A00000; // ^
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assign char_data[63] = 30'h1F; // _
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assign char_data[64] = 30'h10400000; // `
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assign char_data[65] = 30'h7EF7D; // a
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assign char_data[66] = 30'h318F6F7F; // b
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assign char_data[67] = 30'h7E30F; // c
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assign char_data[68] = 30'h637EF6F; // d
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assign char_data[69] = 30'h76F8F; // e
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assign char_data[70] = 30'hEC67D8C; // f
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assign char_data[71] = 30'h1FBDBC7E; // g
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assign char_data[72] = 30'h318F6F7B; // h
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assign char_data[73] = 30'h18063186; // i
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assign char_data[74] = 30'hC6318DC; // j
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assign char_data[75] = 30'h31BD735B; // k
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assign char_data[76] = 30'h18C63186; // l
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assign char_data[77] = 30'h57F7B; // m
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assign char_data[78] = 30'hF6F7B; // n
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assign char_data[79] = 30'h7EF7E; // o
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assign char_data[80] = 30'h3DBDFB18; // p
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assign char_data[81] = 30'h1FBDBC63; // q
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assign char_data[82] = 30'h76F18; // r
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assign char_data[83] = 30'h7F0FE; // s
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assign char_data[84] = 30'h18CF3186; // t
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assign char_data[85] = 30'hDEF6F; // u
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assign char_data[86] = 30'hDED44; // v
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assign char_data[87] = 30'hDEFEA; // w
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assign char_data[88] = 30'hDBB7B; // x
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assign char_data[89] = 30'h37BDBC6E; // y
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assign char_data[90] = 30'hF999F; // z
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assign char_data[91] = 30'h623086; // {
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assign char_data[92] = 30'h421084; // |
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assign char_data[93] = 30'h610C46; // }
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assign char_data[94] = 30'hAA0000; // ~
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reg[13:0] char_index_q, char_index_d;
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reg[10:0] charx;
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reg[9:0] chary;
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reg[7:0] tx_data;
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reg new_tx_data;
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wire tx_busy;
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wire[7:0] rx_data;
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wire new_rx_data;
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reg[5:0] char_color;
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reg char_attribute;
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assign led[7:0] = rx_data;
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avr_interface #(.CLK_FREQ(75000000)) vr_interface (
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.clk(hdmi_clk),
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.rst(rst),
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.cclk(cclk),
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.spi_miso(spi_miso),
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.spi_mosi(spi_mose),
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.spi_sck(spi_sck),
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.spi_ss(spi_ss),
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.spi_channel(spi_channel),
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.tx(avr_rx),
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.rx(avr_tx),
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.channel(4'd15),
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.new_sample(),
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.sample(),
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.sample_channel(),
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.tx_data(tx_data),
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.new_tx_data(new_tx_data),
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.tx_busy(tx_busy),
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.tx_block(avr_rx_busy),
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.rx_data(rx_data),
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.new_rx_data(new_rx_data)
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);
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reg [13:0] addr_q, addr_d, addr_t, addr_n, addr_r;
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reg[7:0] write_data_q, write_data_d;
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reg write_enable, write_enable_c_q, write_enable_c_d;
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wire[7:0] sram_read_data;
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sram #(.SIZE(8), .DEPTH(CHAR_HMAX*CHAR_VMAX)) sram(
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.clk(hdmi_clk),
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.read_address(char_index_q),
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.write_address(addr_q-1),
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.read_data(sram_read_data),
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.write_data(write_data_q),
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.write_en(write_enable)
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);
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always @(*) begin
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// @todo For some reason we need a -1 here, otherwise it looks weird with
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// SCALE = 1
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// Need to figure that out, something to do with wrap around
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charx = (hdmix >> (SCALE-1)) % 8;
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chary = (hdmiy >> (SCALE-1)) % 8;
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char_index_d = (hdmix >> (SCALE+2)) + CHAR_HMAX*(hdmiy >> (SCALE+2));
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//char_color = char_index_d[5:0];
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char_color = 6'b111111;
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//char_attribute = char_index_d[6];
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char_attribute = 1'b0;
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if (char_attribute == 1) begin
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hdmired = 8'h55 * char_color[1:0];
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hdmigreen = 8'h55 * char_color[3:2];
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hdmiblue = 8'h55 * char_color[5:4];
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end else begin
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hdmired = 1'b0;
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hdmigreen = 1'b0;
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hdmiblue = 1'b0;
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end
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if (charx > 0 && charx < 6 && chary > 0 && chary < 7 && char_data[sram_read_data][29 - (charx - 1) - 5*(chary - 1)] == 1) begin
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if (char_attribute == 1) begin
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hdmired = 1'b0;
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hdmigreen = 1'b0;
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hdmiblue = 1'b0;
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end else begin
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hdmired = 8'h55 * char_color[1:0];
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hdmigreen = 8'h55 * char_color[3:2];
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hdmiblue = 8'h55 * char_color[5:4];
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end
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end
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frame_d = frame_q;
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if (hdmix == WIDTH-1 && hdmiy == HEIGHT-1) begin
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frame_d = frame_q + 1'b1;
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end
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// Disable write during IO request
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write_enable = z80_ioreq && write_enable_c_q;
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end
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always @(posedge z80_clk) begin
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write_data_d = write_data_q;
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write_enable_c_d = write_enable_c_q;
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addr_d = addr_q;
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// @todo Hook up address lines
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// if (z80_ioreq != 1 && z80_m1 != 0 && z80_address[7:0] == 8'h10) begin
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if (z80_ioreq != 1 && z80_m1 != 0 && z80_wr != 1) begin
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if (z80_data == "\r") begin
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addr_d = addr_r;
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write_enable_c_d = 0;
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end else if (z80_data == "\n") begin
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addr_d = addr_n;
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write_enable_c_d = 0;
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end else begin
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write_data_d = z80_data - 32;
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addr_d = addr_t;
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write_enable_c_d = 1;
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end
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end
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end
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// IO request starts
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always @(negedge z80_ioreq) begin
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addr_t = (addr_q + 1) % (CHAR_HMAX*CHAR_VMAX);
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addr_n = (addr_q + CHAR_HMAX) % (CHAR_HMAX*CHAR_VMAX);
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addr_r = (addr_q - (addr_q % CHAR_HMAX)) % (CHAR_HMAX*CHAR_VMAX);
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end
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always @(posedge hdmi_clk) begin
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if (rst) begin
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frame_q <= 1'b0;
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char_index_q <= 1'b0;
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addr_q <= 1'b0;
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write_data_q <= 0;
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write_enable_c_q <= 0;
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end else begin
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frame_q <= frame_d;
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char_index_q <= char_index_d;
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addr_q <= addr_d;
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write_data_q <= write_data_d;
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write_enable_c_q <= write_enable_c_d;
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end
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end
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endmodule
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