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MacPlus_MiSTer/sys/hps_io.v
sorgelig 7ca4b6b183 Update sys. Support for custom AR.
2021-01-23 20:09:42 +08:00

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//
// hps_io.v
//
// Copyright (c) 2014 Till Harbaum <till@harbaum.org>
// Copyright (c) 2017-2020 Alexey Melnikov
//
// This source file is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This source file is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
///////////////////////////////////////////////////////////////////////
// altera message_off 10665
//
// Use buffer to access SD card. It's time-critical part.
//
// WIDE=1 for 16 bit file I/O
// VDNUM 1-4
module hps_io #(parameter STRLEN=0, PS2DIV=0, WIDE=0, VDNUM=1, PS2WE=0)
(
input clk_sys,
inout [45:0] HPS_BUS,
// parameter STRLEN and the actual length of conf_str have to match
input [(8*STRLEN)-1:0] conf_str,
// buttons up to 32
output reg [31:0] joystick_0,
output reg [31:0] joystick_1,
output reg [31:0] joystick_2,
output reg [31:0] joystick_3,
output reg [31:0] joystick_4,
output reg [31:0] joystick_5,
// analog -127..+127, Y: [15:8], X: [7:0]
output reg [15:0] joystick_analog_0,
output reg [15:0] joystick_analog_1,
output reg [15:0] joystick_analog_2,
output reg [15:0] joystick_analog_3,
output reg [15:0] joystick_analog_4,
output reg [15:0] joystick_analog_5,
// paddle 0..255
output reg [7:0] paddle_0,
output reg [7:0] paddle_1,
output reg [7:0] paddle_2,
output reg [7:0] paddle_3,
output reg [7:0] paddle_4,
output reg [7:0] paddle_5,
// spinner [7:0] -128..+127, [8] - toggle with every update
output reg [8:0] spinner_0,
output reg [8:0] spinner_1,
output reg [8:0] spinner_2,
output reg [8:0] spinner_3,
output reg [8:0] spinner_4,
output reg [8:0] spinner_5,
output [1:0] buttons,
output forced_scandoubler,
output direct_video,
output reg [63:0] status,
input [63:0] status_in,
input status_set,
input [15:0] status_menumask,
input info_req,
input [7:0] info,
//toggle to force notify of video mode change
input new_vmode,
// SD config
output reg [VD:0] img_mounted, // signaling that new image has been mounted
output reg img_readonly, // mounted as read only. valid only for active bit in img_mounted
output reg [63:0] img_size, // size of image in bytes. valid only for active bit in img_mounted
// SD block level access
input [31:0] sd_lba,
input [VD:0] sd_rd, // only single sd_rd can be active at any given time
input [VD:0] sd_wr, // only single sd_wr can be active at any given time
output reg sd_ack,
// do not use in new projects.
// CID and CSD are fake except CSD image size field.
input sd_conf,
output reg sd_ack_conf,
// SD byte level access. Signals for 2-PORT altsyncram.
output reg [AW:0] sd_buff_addr,
output reg [DW:0] sd_buff_dout,
input [DW:0] sd_buff_din,
output reg sd_buff_wr,
input [15:0] sd_req_type,
// ARM -> FPGA download
output reg ioctl_download = 0, // signal indicating an active download
output reg [15:0] ioctl_index, // menu index used to upload the file
output reg ioctl_wr,
output reg [26:0] ioctl_addr, // in WIDE mode address will be incremented by 2
output reg [DW:0] ioctl_dout,
output reg ioctl_upload = 0, // signal indicating an active upload
input [DW:0] ioctl_din,
output reg ioctl_rd,
output reg [31:0] ioctl_file_ext,
input ioctl_wait,
// [15]: 0 - unset, 1 - set. [1:0]: 0 - none, 1 - 32MB, 2 - 64MB, 3 - 128MB
// [14]: debug mode: [8]: 1 - phase up, 0 - phase down. [7:0]: amount of shift.
output reg [15:0] sdram_sz,
// RTC MSM6242B layout
output reg [64:0] RTC,
// Seconds since 1970-01-01 00:00:00
output reg [32:0] TIMESTAMP,
// UART flags
output reg [7:0] uart_mode,
output reg [31:0] uart_speed,
// ps2 keyboard emulation
output ps2_kbd_clk_out,
output ps2_kbd_data_out,
input ps2_kbd_clk_in,
input ps2_kbd_data_in,
input [2:0] ps2_kbd_led_status,
input [2:0] ps2_kbd_led_use,
output ps2_mouse_clk_out,
output ps2_mouse_data_out,
input ps2_mouse_clk_in,
input ps2_mouse_data_in,
// ps2 alternative interface.
// [8] - extended, [9] - pressed, [10] - toggles with every press/release
output reg [10:0] ps2_key = 0,
// [24] - toggles with every event
output reg [24:0] ps2_mouse = 0,
output reg [15:0] ps2_mouse_ext = 0, // 15:8 - reserved(additional buttons), 7:0 - wheel movements
inout [21:0] gamma_bus,
// for core-specific extensions
inout [35:0] EXT_BUS
);
assign EXT_BUS[31:16] = HPS_BUS[31:16];
assign EXT_BUS[35:33] = HPS_BUS[35:33];
localparam MAX_W = $clog2((512 > (STRLEN+1)) ? 512 : (STRLEN+1))-1;
localparam DW = (WIDE) ? 15 : 7;
localparam AW = (WIDE) ? 7 : 8;
localparam VD = VDNUM-1;
wire io_strobe= HPS_BUS[33];
wire io_enable= HPS_BUS[34];
wire fp_enable= HPS_BUS[35];
wire io_wide = (WIDE) ? 1'b1 : 1'b0;
wire [15:0] io_din = HPS_BUS[31:16];
reg [15:0] io_dout;
assign HPS_BUS[37] = ioctl_wait;
assign HPS_BUS[36] = clk_sys;
assign HPS_BUS[32] = io_wide;
assign HPS_BUS[15:0] = EXT_BUS[32] ? EXT_BUS[15:0] : fp_enable ? fp_dout : io_dout;
reg [15:0] cfg;
assign buttons = cfg[1:0];
//cfg[2] - vga_scaler handled in sys_top
//cfg[3] - csync handled in sys_top
assign forced_scandoubler = cfg[4];
//cfg[5] - ypbpr handled in sys_top
assign direct_video = cfg[10];
// command byte read by the io controller
wire [15:0] sd_cmd =
{
2'b00,
(VDNUM>=4) ? sd_wr[3] : 1'b0,
(VDNUM>=3) ? sd_wr[2] : 1'b0,
(VDNUM>=2) ? sd_wr[1] : 1'b0,
(VDNUM>=4) ? sd_rd[3] : 1'b0,
(VDNUM>=3) ? sd_rd[2] : 1'b0,
(VDNUM>=2) ? sd_rd[1] : 1'b0,
4'h5, sd_conf, 1'b1,
sd_wr[0],
sd_rd[0]
};
/////////////////////////////////////////////////////////
wire [15:0] vc_dout;
video_calc video_calc
(
.clk_100(HPS_BUS[43]),
.clk_vid(HPS_BUS[42]),
.clk_sys(clk_sys),
.ce_pix(HPS_BUS[41]),
.de(HPS_BUS[40]),
.hs(HPS_BUS[39]),
.vs(HPS_BUS[38]),
.vs_hdmi(HPS_BUS[44]),
.f1(HPS_BUS[45]),
.new_vmode(new_vmode),
.par_num(byte_cnt[3:0]),
.dout(vc_dout)
);
/////////////////////////////////////////////////////////
assign gamma_bus[20:0] = {clk_sys, gamma_en, gamma_wr, gamma_wr_addr, gamma_value};
reg gamma_en;
reg gamma_wr;
reg [9:0] gamma_wr_addr;
reg [7:0] gamma_value;
reg [31:0] ps2_key_raw = 0;
wire pressed = (ps2_key_raw[15:8] != 8'hf0);
wire extended = (~pressed ? (ps2_key_raw[23:16] == 8'he0) : (ps2_key_raw[15:8] == 8'he0));
reg [MAX_W:0] byte_cnt;
always@(posedge clk_sys) begin : uio_block
reg [15:0] cmd;
reg [2:0] b_wr;
reg [3:0] stick_idx;
reg [3:0] pdsp_idx;
reg ps2skip = 0;
reg [3:0] stflg = 0;
reg [63:0] status_req;
reg old_status_set = 0;
reg old_info = 0;
reg [7:0] info_n = 0;
reg [15:0] tmp1;
reg [7:0] tmp2;
old_status_set <= status_set;
if(~old_status_set & status_set) begin
stflg <= stflg + 1'd1;
status_req <= status_in;
end
old_info <= info_req;
if(~old_info & info_req) info_n <= info;
sd_buff_wr <= b_wr[0];
if(b_wr[2] && (~&sd_buff_addr)) sd_buff_addr <= sd_buff_addr + 1'b1;
b_wr <= (b_wr<<1);
if(PS2DIV) {kbd_rd,kbd_we,mouse_rd,mouse_we} <= 0;
gamma_wr <= 0;
if(~io_enable) begin
if(cmd == 4 && !ps2skip) ps2_mouse[24] <= ~ps2_mouse[24];
if(cmd == 5 && !ps2skip) begin
ps2_key <= {~ps2_key[10], pressed, extended, ps2_key_raw[7:0]};
if(ps2_key_raw == 'hE012E07C) ps2_key[9:0] <= 'h37C; // prnscr pressed
if(ps2_key_raw == 'h7CE0F012) ps2_key[9:0] <= 'h17C; // prnscr released
if(ps2_key_raw == 'hF014F077) ps2_key[9:0] <= 'h377; // pause pressed
end
if(cmd == 'h22) RTC[64] <= ~RTC[64];
if(cmd == 'h24) TIMESTAMP[32] <= ~TIMESTAMP[32];
cmd <= 0;
byte_cnt <= 0;
sd_ack <= 0;
sd_ack_conf <= 0;
io_dout <= 0;
ps2skip <= 0;
img_mounted <= 0;
end
else if(io_strobe) begin
io_dout <= 0;
if(~&byte_cnt) byte_cnt <= byte_cnt + 1'd1;
if(byte_cnt == 0) begin
cmd <= io_din;
case(io_din)
'h19: sd_ack_conf <= 1;
'h17,
'h18: sd_ack <= 1;
'h29: io_dout <= {4'hA, stflg};
'h2B: io_dout <= 1;
'h2F: io_dout <= 1;
'h32: io_dout <= gamma_bus[21];
'h36: begin io_dout <= info_n; info_n <= 0; end
'h39: io_dout <= 1;
endcase
sd_buff_addr <= 0;
if(io_din == 5) ps2_key_raw <= 0;
end else begin
case(cmd)
// buttons and switches
'h01: cfg <= io_din;
'h02: if(byte_cnt==1) joystick_0[15:0] <= io_din; else joystick_0[31:16] <= io_din;
'h03: if(byte_cnt==1) joystick_1[15:0] <= io_din; else joystick_1[31:16] <= io_din;
'h10: if(byte_cnt==1) joystick_2[15:0] <= io_din; else joystick_2[31:16] <= io_din;
'h11: if(byte_cnt==1) joystick_3[15:0] <= io_din; else joystick_3[31:16] <= io_din;
'h12: if(byte_cnt==1) joystick_4[15:0] <= io_din; else joystick_4[31:16] <= io_din;
'h13: if(byte_cnt==1) joystick_5[15:0] <= io_din; else joystick_5[31:16] <= io_din;
// store incoming ps2 mouse bytes
'h04: begin
if(PS2DIV) begin
mouse_data <= io_din[7:0];
mouse_we <= 1;
end
if(&io_din[15:8]) ps2skip <= 1;
if(~&io_din[15:8] && ~ps2skip && !byte_cnt[MAX_W:2]) begin
case(byte_cnt[1:0])
1: ps2_mouse[7:0] <= io_din[7:0];
2: ps2_mouse[15:8] <= io_din[7:0];
3: ps2_mouse[23:16] <= io_din[7:0];
endcase
case(byte_cnt[1:0])
1: ps2_mouse_ext[7:0] <= {io_din[14], io_din[14:8]};
2: ps2_mouse_ext[11:8] <= io_din[11:8];
3: ps2_mouse_ext[15:12]<= io_din[11:8];
endcase
end
end
// store incoming ps2 keyboard bytes
'h05: begin
if(&io_din[15:8]) ps2skip <= 1;
if(~&io_din[15:8] & ~ps2skip) ps2_key_raw[31:0] <= {ps2_key_raw[23:0], io_din[7:0]};
if(PS2DIV) begin
kbd_data <= io_din[7:0];
kbd_we <= 1;
end
end
// reading config string, returning a byte from string
'h14: if(byte_cnt < STRLEN + 1) io_dout[7:0] <= conf_str[(STRLEN - byte_cnt)<<3 +:8];
// reading sd card status
'h16: if(!byte_cnt[MAX_W:3]) begin
case(byte_cnt[2:0])
1: io_dout <= sd_cmd;
2: io_dout <= sd_lba[15:0];
3: io_dout <= sd_lba[31:16];
4: io_dout <= sd_req_type;
endcase
end
// send SD config IO -> FPGA
// flag that download begins
// sd card knows data is config if sd_dout_strobe is asserted
// with sd_ack still being inactive (low)
'h19,
// send sector IO -> FPGA
// flag that download begins
'h17: begin
sd_buff_dout <= io_din[DW:0];
b_wr <= 1;
end
// reading sd card write data
'h18: begin
if(~&sd_buff_addr) sd_buff_addr <= sd_buff_addr + 1'b1;
io_dout <= sd_buff_din;
end
// joystick analog
'h1a: if(!byte_cnt[MAX_W:2]) begin
case(byte_cnt[1:0])
1: {pdsp_idx,stick_idx} <= io_din[7:0]; // first byte is joystick index
2: case(stick_idx)
0: joystick_analog_0 <= io_din;
1: joystick_analog_1 <= io_din;
2: joystick_analog_2 <= io_din;
3: joystick_analog_3 <= io_din;
4: joystick_analog_4 <= io_din;
5: joystick_analog_5 <= io_din;
15: case(pdsp_idx)
0: paddle_0 <= io_din[7:0];
1: paddle_1 <= io_din[7:0];
2: paddle_2 <= io_din[7:0];
3: paddle_3 <= io_din[7:0];
4: paddle_4 <= io_din[7:0];
5: paddle_5 <= io_din[7:0];
8: spinner_0 <= {~spinner_0[8],io_din[7:0]};
9: spinner_1 <= {~spinner_1[8],io_din[7:0]};
10: spinner_2 <= {~spinner_2[8],io_din[7:0]};
11: spinner_3 <= {~spinner_3[8],io_din[7:0]};
12: spinner_4 <= {~spinner_4[8],io_din[7:0]};
13: spinner_5 <= {~spinner_5[8],io_din[7:0]};
endcase
endcase
endcase
end
// notify image selection
'h1c: begin
img_mounted <= io_din[VD:0] ? io_din[VD:0] : 1'b1;
img_readonly <= io_din[7];
end
// send image info
'h1d: if(byte_cnt<5) img_size[{byte_cnt-1'b1, 4'b0000} +:16] <= io_din;
// status, 64bit version
'h1e: if(!byte_cnt[MAX_W:3]) begin
case(byte_cnt[2:0])
1: status[15:00] <= io_din;
2: status[31:16] <= io_din;
3: status[47:32] <= io_din;
4: status[63:48] <= io_din;
endcase
end
// reading keyboard LED status
'h1f: io_dout <= {|PS2WE, 2'b01, ps2_kbd_led_status[2], ps2_kbd_led_use[2], ps2_kbd_led_status[1], ps2_kbd_led_use[1], ps2_kbd_led_status[0], ps2_kbd_led_use[0]};
// reading ps2 keyboard/mouse control
'h21: if(PS2DIV) begin
if(byte_cnt == 1) begin
io_dout <= kbd_data_host;
kbd_rd <= 1;
end
else
if(byte_cnt == 2) begin
io_dout <= mouse_data_host;
mouse_rd <= 1;
end
end
//RTC
'h22: RTC[(byte_cnt-6'd1)<<4 +:16] <= io_din;
//Video res.
'h23: if(!byte_cnt[MAX_W:4]) io_dout <= vc_dout;
//RTC
'h24: TIMESTAMP[(byte_cnt-6'd1)<<4 +:16] <= io_din;
//status set
'h29: if(!byte_cnt[MAX_W:3]) begin
case(byte_cnt[2:0])
1: io_dout <= status_req[15:00];
2: io_dout <= status_req[31:16];
3: io_dout <= status_req[47:32];
4: io_dout <= status_req[63:48];
endcase
end
//menu mask
'h2E: if(byte_cnt == 1) io_dout <= status_menumask;
//sdram size set
'h31: if(byte_cnt == 1) sdram_sz <= io_din;
// Gamma
'h32: gamma_en <= io_din[0];
'h33: begin
gamma_wr_addr <= {(byte_cnt[1:0]-1'b1),io_din[15:8]};
{gamma_wr, gamma_value} <= {1'b1,io_din[7:0]};
if (byte_cnt[1:0] == 3) byte_cnt <= 1;
end
// UART
'h3b: if(!byte_cnt[MAX_W:2]) begin
case(byte_cnt[1:0])
1: tmp2 <= io_din[7:0];
2: tmp1 <= io_din;
3: {uart_speed, uart_mode} <= {io_din, tmp1, tmp2};
endcase
end
endcase
end
end
end
/////////////////////////////// PS2 ///////////////////////////////
generate
if(PS2DIV) begin
reg clk_ps2;
always @(posedge clk_sys) begin
integer cnt;
cnt <= cnt + 1'd1;
if(cnt == PS2DIV) begin
clk_ps2 <= ~clk_ps2;
cnt <= 0;
end
end
reg [7:0] kbd_data;
reg kbd_we;
wire [8:0] kbd_data_host;
reg kbd_rd;
ps2_device keyboard
(
.clk_sys(clk_sys),
.wdata(kbd_data),
.we(kbd_we),
.ps2_clk(clk_ps2),
.ps2_clk_out(ps2_kbd_clk_out),
.ps2_dat_out(ps2_kbd_data_out),
.ps2_clk_in(ps2_kbd_clk_in || !PS2WE),
.ps2_dat_in(ps2_kbd_data_in || !PS2WE),
.rdata(kbd_data_host),
.rd(kbd_rd)
);
reg [7:0] mouse_data;
reg mouse_we;
wire [8:0] mouse_data_host;
reg mouse_rd;
ps2_device mouse
(
.clk_sys(clk_sys),
.wdata(mouse_data),
.we(mouse_we),
.ps2_clk(clk_ps2),
.ps2_clk_out(ps2_mouse_clk_out),
.ps2_dat_out(ps2_mouse_data_out),
.ps2_clk_in(ps2_mouse_clk_in || !PS2WE),
.ps2_dat_in(ps2_mouse_data_in || !PS2WE),
.rdata(mouse_data_host),
.rd(mouse_rd)
);
end
else begin
assign ps2_kbd_clk_out = 0;
assign ps2_kbd_data_out = 0;
assign ps2_mouse_clk_out = 0;
assign ps2_mouse_data_out = 0;
end
endgenerate
/////////////////////////////// DOWNLOADING ///////////////////////////////
localparam FIO_FILE_TX = 8'h53;
localparam FIO_FILE_TX_DAT = 8'h54;
localparam FIO_FILE_INDEX = 8'h55;
localparam FIO_FILE_INFO = 8'h56;
reg [15:0] fp_dout;
always@(posedge clk_sys) begin : fio_block
reg [15:0] cmd;
reg [2:0] cnt;
reg has_cmd;
reg [26:0] addr;
reg wr;
ioctl_rd <= 0;
ioctl_wr <= wr;
wr <= 0;
if(~fp_enable) has_cmd <= 0;
else begin
if(io_strobe) begin
if(!has_cmd) begin
cmd <= io_din;
has_cmd <= 1;
cnt <= 0;
end else begin
case(cmd)
FIO_FILE_INFO:
if(~cnt[1]) begin
case(cnt)
0: ioctl_file_ext[31:16] <= io_din;
1: ioctl_file_ext[15:00] <= io_din;
endcase
cnt <= cnt + 1'd1;
end
FIO_FILE_INDEX:
begin
ioctl_index <= io_din[15:0];
end
FIO_FILE_TX:
begin
cnt <= cnt + 1'd1;
case(cnt)
0: if(io_din[7:0] == 8'hAA) begin
ioctl_addr <= 0;
ioctl_upload <= 1;
ioctl_rd <= 1;
end
else if(io_din[7:0]) begin
addr <= 0;
ioctl_download <= 1;
end
else begin
if(ioctl_download) ioctl_addr <= addr;
ioctl_download <= 0;
ioctl_upload <= 0;
end
1: begin
ioctl_addr[15:0] <= io_din;
addr[15:0] <= io_din;
end
2: begin
ioctl_addr[26:16] <= io_din[10:0];
addr[26:16] <= io_din[10:0];
end
endcase
end
FIO_FILE_TX_DAT:
if(ioctl_download) begin
ioctl_addr <= addr;
ioctl_dout <= io_din[DW:0];
wr <= 1;
addr <= addr + (WIDE ? 2'd2 : 2'd1);
end
else begin
ioctl_addr <= ioctl_addr + (WIDE ? 2'd2 : 2'd1);
fp_dout <= ioctl_din;
ioctl_rd <= 1;
end
endcase
end
end
end
end
endmodule
//////////////////////////////////////////////////////////////////////////////////
module ps2_device #(parameter PS2_FIFO_BITS=5)
(
input clk_sys,
input [7:0] wdata,
input we,
input ps2_clk,
output reg ps2_clk_out,
output reg ps2_dat_out,
output reg tx_empty,
input ps2_clk_in,
input ps2_dat_in,
output [8:0] rdata,
input rd
);
(* ramstyle = "logic" *) reg [7:0] fifo[1<<PS2_FIFO_BITS];
reg [PS2_FIFO_BITS-1:0] wptr;
reg [PS2_FIFO_BITS-1:0] rptr;
reg [2:0] rx_state = 0;
reg [3:0] tx_state = 0;
reg has_data;
reg [7:0] data;
assign rdata = {has_data, data};
always@(posedge clk_sys) begin
reg [7:0] tx_byte;
reg parity;
reg r_inc;
reg old_clk;
reg [1:0] timeout;
reg [3:0] rx_cnt;
reg c1,c2,d1;
tx_empty <= ((wptr == rptr) && (tx_state == 0));
if(we && !has_data) begin
fifo[wptr] <= wdata;
wptr <= wptr + 1'd1;
end
if(rd) has_data <= 0;
c1 <= ps2_clk_in;
c2 <= c1;
d1 <= ps2_dat_in;
if(!rx_state && !tx_state && ~c2 && c1 && ~d1) begin
rx_state <= rx_state + 1'b1;
ps2_dat_out <= 1;
end
old_clk <= ps2_clk;
if(~old_clk & ps2_clk) begin
if(rx_state) begin
case(rx_state)
1: begin
rx_state <= rx_state + 1'b1;
rx_cnt <= 0;
end
2: begin
if(rx_cnt <= 7) data <= {d1, data[7:1]};
else rx_state <= rx_state + 1'b1;
rx_cnt <= rx_cnt + 1'b1;
end
3: if(d1) begin
rx_state <= rx_state + 1'b1;
ps2_dat_out <= 0;
end
4: begin
ps2_dat_out <= 1;
has_data <= 1;
rx_state <= 0;
rptr <= 0;
wptr <= 0;
end
endcase
end else begin
// transmitter is idle?
if(tx_state == 0) begin
// data in fifo present?
if(c2 && c1 && d1 && wptr != rptr) begin
timeout <= timeout - 1'd1;
if(!timeout) begin
tx_byte <= fifo[rptr];
rptr <= rptr + 1'd1;
// reset parity
parity <= 1;
// start transmitter
tx_state <= 1;
// put start bit on data line
ps2_dat_out <= 0; // start bit is 0
end
end
end else begin
// transmission of 8 data bits
if((tx_state >= 1)&&(tx_state < 9)) begin
ps2_dat_out <= tx_byte[0]; // data bits
tx_byte[6:0] <= tx_byte[7:1]; // shift down
if(tx_byte[0])
parity <= !parity;
end
// transmission of parity
if(tx_state == 9) ps2_dat_out <= parity;
// transmission of stop bit
if(tx_state == 10) ps2_dat_out <= 1; // stop bit is 1
// advance state machine
if(tx_state < 11) tx_state <= tx_state + 1'd1;
else tx_state <= 0;
end
end
end
if(~old_clk & ps2_clk) ps2_clk_out <= 1;
if(old_clk & ~ps2_clk) ps2_clk_out <= ((tx_state == 0) && (rx_state<2));
end
endmodule
///////////////// calc video parameters //////////////////
module video_calc
(
input clk_100,
input clk_vid,
input clk_sys,
input ce_pix,
input de,
input hs,
input vs,
input vs_hdmi,
input f1,
input new_vmode,
input [3:0] par_num,
output reg [15:0] dout
);
always @(posedge clk_sys) begin
case(par_num)
1: dout <= {|vid_int, vid_nres};
2: dout <= vid_hcnt[15:0];
3: dout <= vid_hcnt[31:16];
4: dout <= vid_vcnt[15:0];
5: dout <= vid_vcnt[31:16];
6: dout <= vid_htime[15:0];
7: dout <= vid_htime[31:16];
8: dout <= vid_vtime[15:0];
9: dout <= vid_vtime[31:16];
10: dout <= vid_pix[15:0];
11: dout <= vid_pix[31:16];
12: dout <= vid_vtime_hdmi[15:0];
13: dout <= vid_vtime_hdmi[31:16];
default dout <= 0;
endcase
end
reg [31:0] vid_hcnt = 0;
reg [31:0] vid_vcnt = 0;
reg [7:0] vid_nres = 0;
reg [1:0] vid_int = 0;
always @(posedge clk_vid) begin
integer hcnt;
integer vcnt;
reg old_vs= 0, old_de = 0, old_vmode = 0;
reg [3:0] resto = 0;
reg calch = 0;
if(ce_pix) begin
old_vs <= vs;
old_de <= de;
if(~vs & ~old_de & de) vcnt <= vcnt + 1;
if(calch & de) hcnt <= hcnt + 1;
if(old_de & ~de) calch <= 0;
if(old_vs & ~vs) begin
vid_int <= {vid_int[0],f1};
if(~f1) begin
if(hcnt && vcnt) begin
old_vmode <= new_vmode;
//report new resolution after timeout
if(resto) resto <= resto + 1'd1;
if(vid_hcnt != hcnt || vid_vcnt != vcnt || old_vmode != new_vmode) resto <= 1;
if(&resto) vid_nres <= vid_nres + 1'd1;
vid_hcnt <= hcnt;
vid_vcnt <= vcnt;
end
vcnt <= 0;
hcnt <= 0;
calch <= 1;
end
end
end
end
reg [31:0] vid_htime = 0;
reg [31:0] vid_vtime = 0;
reg [31:0] vid_pix = 0;
always @(posedge clk_100) begin
integer vtime, htime, hcnt;
reg old_vs, old_hs, old_vs2, old_hs2, old_de, old_de2;
reg calch = 0;
old_vs <= vs;
old_hs <= hs;
old_vs2 <= old_vs;
old_hs2 <= old_hs;
vtime <= vtime + 1'd1;
htime <= htime + 1'd1;
if(~old_vs2 & old_vs) begin
vid_pix <= hcnt;
vid_vtime <= vtime;
vtime <= 0;
hcnt <= 0;
end
if(old_vs2 & ~old_vs) calch <= 1;
if(~old_hs2 & old_hs) begin
vid_htime <= htime;
htime <= 0;
end
old_de <= de;
old_de2 <= old_de;
if(calch & old_de) hcnt <= hcnt + 1;
if(old_de2 & ~old_de) calch <= 0;
end
reg [31:0] vid_vtime_hdmi;
always @(posedge clk_100) begin
integer vtime;
reg old_vs, old_vs2;
old_vs <= vs_hdmi;
old_vs2 <= old_vs;
vtime <= vtime + 1'd1;
if(~old_vs2 & old_vs) begin
vid_vtime_hdmi <= vtime;
vtime <= 0;
end
end
endmodule
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