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updated segment interface

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Parker TenBroeck 2026-03-12 21:49:21 -04:00
parent 4773ab5e9e
commit 5746846896
9 changed files with 183 additions and 195 deletions
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6
examples/example.vhdl
View file

@ -9,10 +9,8 @@ port (
btn: in std_logic_vector(31 downto 0);
sw: in std_logic_vector(31 downto 0);
led: out std_logic_vector(31 downto 0) := (others => '0');
seg0: out std_logic_vector(31 downto 0);
seg1: out std_logic_vector(31 downto 0);
seg2: out std_logic_vector(31 downto 0);
seg3: out std_logic_vector(31 downto 0)
segv: out std_logic_vector(31 downto 0);
segs: out std_logic_vector(31 downto 0)
);
end circuit;

63
libvhdl_conn/src/lib.rs
View file

@ -1,22 +1,23 @@
use std::{
io::{BufRead, BufReader},
sync::atomic::{AtomicU8, AtomicU32, AtomicU64, Ordering},
sync::atomic::{AtomicU32, AtomicU64, Ordering},
};
pub struct SimState{
pub struct SimState {
switch: AtomicU32,
button: AtomicU32,
led: AtomicU32,
segs: [AtomicU32; 4],
updated: AtomicU8,
/// represents 4 segments (each byte being one segment)
segs: [AtomicU32; 8],
updated: AtomicU32,
}
static STATE: SimState = SimState{
static STATE: SimState = SimState {
switch: AtomicU32::new(0),
button: AtomicU32::new(0),
led: AtomicU32::new(0),
segs: [const{AtomicU32::new(0)}; 4],
updated: AtomicU8::new(0)
segs: [const { AtomicU32::new(0) }; 8],
updated: AtomicU32::new(0),
};
/// default 1 ms
@ -34,13 +35,15 @@ fn client() {
if let Ok(n) = v.parse::<u32>() {
STATE.button.store(n, Ordering::Relaxed);
}
} else if let value = STATE.updated.swap(0, Ordering::Relaxed) && value!=0 {
if (value >> 0) & 1 == 1{
} else if let value = STATE.updated.swap(0, Ordering::Relaxed)
&& value != 0
{
if (value >> 0) & 1 == 1 {
eprintln!("led={}", STATE.led.load(Ordering::Relaxed));
}
for i in 0..4{
if (value >> (i+1)) & 1 == 1{
eprintln!("seg{i}={}", STATE.segs[i].load(Ordering::Relaxed));
for i in 0..STATE.segs.len() {
if (value >> (i + 1)) & 1 == 1 {
eprintln!("seg={};{i}", STATE.segs[i].load(Ordering::Relaxed));
}
}
}
@ -49,12 +52,15 @@ fn client() {
#[unsafe(no_mangle)]
pub extern "C" fn ffi_init() {
std::thread::Builder::new().name("client".into()).spawn(client).expect("Failed to spawn client thread");
for arg in std::env::args(){
if let Some(arg) = arg.strip_prefix("--cycle_sleep").or(arg.strip_prefix("-c")){
if let Ok(nanos) = arg.trim().parse::<u64>(){
std::thread::Builder::new()
.name("client".into())
.spawn(client)
.expect("Failed to spawn client thread");
for arg in std::env::args() {
if let Some(arg) = arg.strip_prefix("--cycle_sleep").or(arg.strip_prefix("-c")) {
if let Ok(nanos) = arg.trim().parse::<u64>() {
SLEEP_NANOS.store(nanos, Ordering::Relaxed);
}else{
} else {
eprintln!("cycle sleep(ns) failed to parse");
}
}
@ -73,22 +79,19 @@ pub extern "C" fn ffi_get_btn() -> u32 {
}
#[unsafe(no_mangle)]
pub extern "C" fn ffi_set_outputs(led: u32, seg0: u32, seg1: u32, seg2: u32, seg3: u32) {
pub extern "C" fn ffi_set_outputs(led: u32, segv: u32, segs: u32) {
let o_led = STATE.led.swap(led, Ordering::Relaxed) != led;
let o_seg0 = STATE.segs[0].swap(seg0, Ordering::Relaxed) != seg0;
let o_seg1 = STATE.segs[1].swap(seg1, Ordering::Relaxed) != seg1;
let o_seg2 = STATE.segs[2].swap(seg2, Ordering::Relaxed) != seg2;
let o_seg3 = STATE.segs[3].swap(seg3, Ordering::Relaxed) != seg3;
let mut to_set = o_led as u32;
let to_set = (o_led as u8) << 0
| (o_seg0 as u8) << 1
| (o_seg1 as u8) << 2
| (o_seg2 as u8) << 3
| (o_seg3 as u8) << 4;
if let Some(place) = STATE.segs.get(segs as usize) {
let seg = place.swap(segv, Ordering::Relaxed) != segv;
to_set |= (seg as u32 + 1) << segs
}
STATE.updated.fetch_or(to_set, Ordering::Relaxed);
std::thread::sleep(std::time::Duration::from_nanos(SLEEP_NANOS.load(Ordering::Relaxed)));
}
std::thread::sleep(std::time::Duration::from_nanos(
SLEEP_NANOS.load(Ordering::Relaxed),
));
}

19
relay/src/build.rs
View file

@ -1,5 +1,8 @@
use std::{
collections::HashMap, ffi::OsStr, ops::Deref, path::{Path, PathBuf}
collections::HashMap,
ffi::OsStr,
ops::Deref,
path::{Path, PathBuf},
};
use tokio::process::{Child, Command};
@ -46,9 +49,7 @@ impl AsRef<Path> for TempDir {
}
}
pub async fn copy_and_build(
files: HashMap<String, String>,
) -> HResult<TempDir> {
pub async fn copy_and_build(files: HashMap<String, String>) -> HResult<TempDir> {
use std::hash::*;
let mut hasher = std::hash::DefaultHasher::default();
for (key, value) in &files {
@ -73,19 +74,18 @@ pub async fn copy_and_build(
Ok(work_dir)
}
pub async fn build(build: &Path, src: &Path) -> HResult<()>{
pub async fn build(build: &Path, src: &Path) -> HResult<()> {
std::fs::create_dir_all(build)?;
let embedded_lib_path = build.join("libvhdl_conn.a");
let embedded_tb_path = build.join("tb.vhdl");
std::fs::write(&embedded_lib_path, EMBEDDED_VHDL_UI_LIB)?;
std::fs::write(&embedded_tb_path, EMBEDDED_TB_VHDL)?;
let mut cmd = Command::new("ghdl");
let mut cmd = Command::new("ghdl");
cmd.kill_on_drop(true);
cmd.args(["-i", "-g", "--std=08"]);
for file in src.read_dir().unwrap().flatten(){
for file in src.read_dir().unwrap().flatten() {
if Path::new(&file.file_name()).extension() == Some(OsStr::new("vhdl")) {
cmd.arg(file.path().canonicalize()?);
}
@ -99,7 +99,6 @@ pub async fn build(build: &Path, src: &Path) -> HResult<()>{
cmd.current_dir(build);
ensure_ok(cmd.spawn()?).await?;
let mut cmd = Command::new("ghdl");
cmd.kill_on_drop(true);
cmd.args(["-m", "--std=08"]);
@ -113,6 +112,6 @@ pub async fn build(build: &Path, src: &Path) -> HResult<()>{
.stdout(std::process::Stdio::piped())
.stderr(std::process::Stdio::piped());
ensure_ok(cmd.spawn()?).await?;
Ok(())
}

55
relay/src/main.rs
View file

@ -29,7 +29,10 @@ async fn serve_styles() -> impl IntoResponse {
async fn serve_app_js() -> impl IntoResponse {
(
[(header::CONTENT_TYPE, "application/javascript; charset=utf-8")],
[(
header::CONTENT_TYPE,
"application/javascript; charset=utf-8",
)],
UI_APP_JS,
)
}
@ -91,7 +94,8 @@ fn parse_config_from_args() -> Result<Config, String> {
}
"--help" | "-h" => {
return Err(
"usage: relay [--ip <ip>] [--port <port>] [--update-ms <ms>] [--workspace]".into(),
"usage: relay [--ip <ip>] [--port <port>] [--update-ms <ms>] [--workspace]"
.into(),
);
}
_ => {
@ -116,30 +120,24 @@ async fn main() {
};
let update_interval = Duration::from_millis(cfg.update_ms);
let mut app = Router::new()
.route(
"/",
get(move || {
async move { serve_index().await }
}),
)
.route(
"/index.html",
get(move || {
async move { serve_index().await }
}),
)
.route("/styles.css", get(serve_styles))
.route("/app.js", get(serve_app_js))
.route(
"/ws/uploaded",
get(move |ws: WebSocketUpgrade| {
let update_interval = update_interval;
async move {
ws.on_upgrade(move |socket| uploaded::ws_handler(socket, update_interval))
}
}),
);
let mut app =
Router::new()
.route("/", get(move || async move { serve_index().await }))
.route(
"/index.html",
get(move || async move { serve_index().await }),
)
.route("/styles.css", get(serve_styles))
.route("/app.js", get(serve_app_js))
.route(
"/ws/uploaded",
get(move |ws: WebSocketUpgrade| {
let update_interval = update_interval;
async move {
ws.on_upgrade(move |socket| uploaded::ws_handler(socket, update_interval))
}
}),
);
if cfg.workspace_ws {
app = app.route(
@ -183,10 +181,7 @@ pub enum ServerMsg<'a> {
Start,
Stop,
Led(u32),
Seg0(u32),
Seg1(u32),
Seg2(u32),
Seg3(u32),
Seg { value: u32, index: u32 },
}
pub type HResult<T> = Result<T, Box<dyn std::error::Error + Sync + Send>>;

52
relay/src/uploaded.rs
View file

@ -1,12 +1,9 @@
use axum::{
extract::ws::{Message, WebSocket},
};
use futures_util::{
SinkExt, StreamExt,
};
use axum::extract::ws::{Message, WebSocket};
use futures_util::{SinkExt, StreamExt};
use std::{collections::HashMap, time::Duration};
use tokio::{
io::{AsyncBufReadExt, BufReader}, time::Instant,
io::{AsyncBufReadExt, BufReader},
time::Instant,
};
use crate::{ClientMsg, HResult, ServerMsg, build, run};
@ -16,27 +13,30 @@ pub async fn ws_handler(socket: WebSocket, refresh_time: Duration) {
let files = if let Some(Ok(Message::Text(msg))) = receiver.next().await
&& let Ok(files) = serde_json::from_str::<'_, HashMap<String, String>>(&msg)
{
{
files
} else {
return;
};
let artifact_dir = match build::copy_and_build(files).await{
let artifact_dir = match build::copy_and_build(files).await {
Ok(dir) => dir,
Err(err) => {
_ = sender.send(Message::Text(format!("Failed to build: {err}").into())).await;
_ = sender
.send(Message::Text(format!("Failed to build: {err}").into()))
.await;
return;
},
}
};
let mut process = match run::run(&artifact_dir).await{
let mut process = match run::run(&artifact_dir).await {
Ok(process) => process,
Err(err) => {
_ = sender.send(Message::Text(format!("Failed to run: {err}").into())).await;
_ = sender
.send(Message::Text(format!("Failed to run: {err}").into()))
.await;
return;
},
}
};
let mut sout = BufReader::new(process.stdout).lines();
let mut serr = BufReader::new(process.stderr).lines();
@ -44,7 +44,7 @@ pub async fn ws_handler(socket: WebSocket, refresh_time: Duration) {
let artifact_prefix = artifact_dir.to_str().unwrap_or("\0\0NOPE");
let mut print_deadline = Instant::now();
let result: HResult<()> = async {
loop{
tokio::select! {
@ -89,14 +89,12 @@ pub async fn ws_handler(socket: WebSocket, refresh_time: Duration) {
Ok(Some(line)) => {
let msg = if let Some(repr) = line.strip_prefix("led="){
ServerMsg::Led(repr.parse().unwrap_or(0))
}else if let Some(repr) = line.strip_prefix("seg0="){
ServerMsg::Seg0(repr.parse().unwrap_or(0))
}else if let Some(repr) = line.strip_prefix("seg1="){
ServerMsg::Seg1(repr.parse().unwrap_or(0))
}else if let Some(repr) = line.strip_prefix("seg2="){
ServerMsg::Seg2(repr.parse().unwrap_or(0))
}else if let Some(repr) = line.strip_prefix("seg3="){
ServerMsg::Seg3(repr.parse().unwrap_or(0))
}else if let Some(repr) = line.strip_prefix("seg=")
&& let Some((val, idx)) = repr.split_once(";") {
ServerMsg::Seg{
value: val.parse().unwrap_or(0),
index: idx.parse().unwrap_or(0)
}
}else{
ServerMsg::Log {
stream: "stderr",
@ -121,10 +119,10 @@ pub async fn ws_handler(socket: WebSocket, refresh_time: Duration) {
Ok(())
}.await;
match result{
Ok(_) => {},
match result {
Ok(_) => {}
Err(err) => {
_ = sender.send(Message::Text(format!("{err}").into())).await;
},
}
}
}

104
relay/src/workspace.rs
View file

@ -1,5 +1,6 @@
use axum::{
Error, extract::ws::{Message, WebSocket}
Error,
extract::ws::{Message, WebSocket},
};
use futures_util::{
SinkExt, StreamExt,
@ -8,12 +9,12 @@ use futures_util::{
use std::{path::PathBuf, time::Duration};
use tokio::{
io::{AsyncBufReadExt, BufReader, Lines},
process::{Child, ChildStderr, ChildStdin, ChildStdout}, time::Instant,
process::{Child, ChildStderr, ChildStdin, ChildStdout},
time::Instant,
};
use crate::{ClientMsg, ServerMsg, build, run};
struct Process {
process: Child,
@ -22,7 +23,6 @@ struct Process {
stdin: ChildStdin,
}
struct Handler {
sender: SplitSink<WebSocket, Message>,
receiver: SplitStream<WebSocket>,
@ -36,7 +36,6 @@ struct Handler {
}
impl Handler {
fn workspace(socket: WebSocket, build: PathBuf, src: PathBuf, refresh_time: Duration) -> Self {
let (sender, receiver) = socket.split();
Self {
@ -55,7 +54,12 @@ impl Handler {
stream: "stdout",
line: msg.as_ref(),
};
_ = self.sender.send(Message::Text(serde_json::to_string(&msg).unwrap_or_default().into())).await;
_ = self
.sender
.send(Message::Text(
serde_json::to_string(&msg).unwrap_or_default().into(),
))
.await;
}
pub async fn eprint(&mut self, msg: impl AsRef<str>) {
@ -64,36 +68,51 @@ impl Handler {
stream: "stderr",
line: msg.as_ref(),
};
_ = self.sender.send(Message::Text(serde_json::to_string(&msg).unwrap_or_default().into())).await;
_ = self
.sender
.send(Message::Text(
serde_json::to_string(&msg).unwrap_or_default().into(),
))
.await;
}
async fn stop_process(&mut self) {
self.process = None;
_ = self.sender.send(Message::Text(serde_json::to_string(&ServerMsg::Stop).unwrap_or_default().into())).await;
_ = self
.sender
.send(Message::Text(
serde_json::to_string(&ServerMsg::Stop)
.unwrap_or_default()
.into(),
))
.await;
}
async fn handle_websocket_msg(&mut self, msg: ClientMsg) {
match msg{
match msg {
ClientMsg::Start => self.run_program().await,
ClientMsg::Stop => self.stop_process().await,
ClientMsg::Input { switch, buttons } => {
if let Some(process) = &mut self.process{
if let Some(process) = &mut self.process {
use tokio::io::AsyncWriteExt;
_ = process.stdin.write_all(format!("btn={}\n", buttons).as_bytes()).await;
_ = process.stdin.write_all(format!("sw={}\n", switch).as_bytes()).await;
_ = process
.stdin
.write_all(format!("btn={}\n", buttons).as_bytes())
.await;
_ = process
.stdin
.write_all(format!("sw={}\n", switch).as_bytes())
.await;
}
},
}
}
}
async fn handle_websocket_receive(
&mut self,
msg: Option<Result<Message, Error>>,
) -> bool {
async fn handle_websocket_receive(&mut self, msg: Option<Result<Message, Error>>) -> bool {
match msg {
Some(Ok(Message::Close(_))) => true,
Some(Ok(Message::Text(msg))) => {
let msg = match serde_json::from_str(msg.as_str()){
let msg = match serde_json::from_str(msg.as_str()) {
Ok(msg) => msg,
Err(err) => {
self.eprint(format!("Client message error {err}")).await;
@ -107,7 +126,7 @@ impl Handler {
Some(Err(err)) => {
self.eprint(format!("Client websocket error {err}")).await;
true
},
}
None => true,
}
}
@ -115,7 +134,7 @@ impl Handler {
async fn run(&mut self) {
loop {
if let Some(process) = &mut self.process {
if let Ok(Some(_)) = process.process.try_wait(){
if let Ok(Some(_)) = process.process.try_wait() {
self.stop_process().await;
continue;
}
@ -143,14 +162,12 @@ impl Handler {
Ok(Some(line)) => {
let msg = if let Some(repr) = line.strip_prefix("led="){
ServerMsg::Led(repr.parse().unwrap_or(0))
}else if let Some(repr) = line.strip_prefix("seg0="){
ServerMsg::Seg0(repr.parse().unwrap_or(0))
}else if let Some(repr) = line.strip_prefix("seg1="){
ServerMsg::Seg1(repr.parse().unwrap_or(0))
}else if let Some(repr) = line.strip_prefix("seg2="){
ServerMsg::Seg2(repr.parse().unwrap_or(0))
}else if let Some(repr) = line.strip_prefix("seg3="){
ServerMsg::Seg3(repr.parse().unwrap_or(0))
}else if let Some(repr) = line.strip_prefix("seg=")
&& let Some((val, idx)) = repr.split_once(";") {
ServerMsg::Seg{
value: val.parse().unwrap_or(0),
index: idx.parse().unwrap_or(0)
}
}else{
self.eprint(line).await;
continue;
@ -170,19 +187,18 @@ impl Handler {
_ = process.stdin.write_all("\n".as_bytes()).await;
}
}
}else{
} else {
let res = self.receiver.next().await;
if self.handle_websocket_receive(res).await{
if self.handle_websocket_receive(res).await {
break;
}
}
}
}
async fn run_program(&mut self) {
async fn run_program(&mut self) {
match build::build(&self.build_dir, &self.src_dir).await {
Ok(_) => {},
Ok(_) => {}
Err(err) => {
_ = self.eprint(format!("Failed to build: {err}")).await;
return;
@ -200,13 +216,25 @@ impl Handler {
let stderr = BufReader::new(process.stderr).lines();
let stdin = process.stdin;
_ = self.sender.send(Message::Text(serde_json::to_string(&ServerMsg::Start).unwrap_or_default().into())).await;
self.process = Some(
Process { process: process.child, stderr, stdout, stdin }
)
_ = self
.sender
.send(Message::Text(
serde_json::to_string(&ServerMsg::Start)
.unwrap_or_default()
.into(),
))
.await;
self.process = Some(Process {
process: process.child,
stderr,
stdout,
stdin,
})
}
}
pub async fn ws_handler(socket: WebSocket, refresh_time: Duration) {
Handler::workspace(socket, "./target".into(), "./src".into(), refresh_time).run().await;
Handler::workspace(socket, "./target".into(), "./src".into(), refresh_time)
.run()
.await;
}

45
relay/ui/app.js
View file

@ -12,10 +12,8 @@ port (
btn: in std_logic_vector(31 downto 0);
sw: in std_logic_vector(31 downto 0);
led: out std_logic_vector(31 downto 0) := (others => '0');
seg0: out std_logic_vector(31 downto 0);
seg1: out std_logic_vector(31 downto 0);
seg2: out std_logic_vector(31 downto 0);
seg3: out std_logic_vector(31 downto 0)
segv: out std_logic_vector(31 downto 0);
segs: out std_logic_vector(31 downto 0)
);
end circuit;
@ -250,6 +248,8 @@ class OutputController {
constructor({ ledRow, hexRow }) {
this.ledRow = ledRow;
this.hexRow = hexRow;
// Each backend segN value encodes 4 seven-segment displays, one byte each.
this.segDisplaysPerGroup = 4;
this.ledEls = Array.from(this.ledRow.querySelectorAll(".led[data-bit]"));
this.segDisplays = Array.from(this.hexRow.querySelectorAll(".sevenSeg[data-digit]"));
@ -275,37 +275,12 @@ class OutputController {
return true;
}
let handledSegment = false;
// Row mapping:
// seg0 -> displays 0..7
// seg1 -> displays 8..15
// seg2 -> displays 16..23
// seg3 -> displays 24..31
for (let row = 0; row < 4; row += 1) {
const key = `seg${row}`;
if (parsed[key] === undefined) continue;
const rowBytes = parseSegRowBytes(parsed[key]);
if (!rowBytes) continue;
this.setSegRow(row, rowBytes);
handledSegment = true;
}
// Backward-compat path for a single 32-bit value (fills first 4 displays).
if (!handledSegment && parsed.seg !== undefined) {
const bytes = parseHexDigits(Number(parsed.seg) >>> 0);
this.setSegRow(0, bytes);
handledSegment = true;
}
if (handledSegment) {
if (parsed.seg !== undefined){
const groupBytes = parseSegRowBytes(parsed.seg.value);
this.setSegGroup(parsed.seg.index, groupBytes);
this.renderAllSegments();
return true;
}
return false;
}
setLeds(bitsU32) {
@ -329,9 +304,9 @@ class OutputController {
}
}
setSegRow(rowIndex, bytes) {
const base = rowIndex * 8;
for (let i = 0; i < 8; i += 1) {
setSegGroup(groupIndex, bytes) {
const base = groupIndex * this.segDisplaysPerGroup;
for (let i = 0; i < this.segDisplaysPerGroup; i += 1) {
const dst = base + i;
if (dst >= this.segBytes.length) break;
this.segBytes[dst] = bytes[i] & 0xff;

20
rtl/tb.vhdl
View file

@ -12,10 +12,8 @@ architecture sim of tb is
signal btn : std_logic_vector(31 downto 0) := (others => '0');
signal sw : std_logic_vector(31 downto 0) := (others => '0');
signal led : std_logic_vector(31 downto 0) := (others => '0');
signal seg0 : std_logic_vector(31 downto 0) := (others => '0');
signal seg1 : std_logic_vector(31 downto 0) := (others => '0');
signal seg2 : std_logic_vector(31 downto 0) := (others => '0');
signal seg3 : std_logic_vector(31 downto 0) := (others => '0');
signal segv : std_logic_vector(31 downto 0) := (others => '0');
signal segs : std_logic_vector(31 downto 0) := (others => '0');
procedure ffi_init is
@ -37,7 +35,7 @@ architecture sim of tb is
end function;
attribute foreign of ffi_get_btn : function is "VHPIDIRECT ffi_get_btn";
procedure ffi_set_outputs(led_i: integer; seg0_i: integer; seg1_i: integer; seg2_i: integer; seg3_i: integer) is
procedure ffi_set_outputs(led_i: integer; segv_i: integer; segs_i: integer) is
begin
end procedure;
attribute foreign of ffi_set_outputs : procedure is
@ -63,10 +61,8 @@ begin
btn => btn,
sw => sw,
led => led,
seg0 => seg0,
seg1 => seg1,
seg2 => seg2,
seg3 => seg3
segv => segv,
segs => segs
);
-- 500 Hz clock (2 ms period)
@ -91,10 +87,8 @@ begin
ffi_set_outputs(
to_integer(signed(clean_slv(led))),
to_integer(signed(clean_slv(seg0))),
to_integer(signed(clean_slv(seg1))),
to_integer(signed(clean_slv(seg2))),
to_integer(signed(clean_slv(seg3)))
to_integer(signed(clean_slv(segv))),
to_integer(signed(clean_slv(segs)))
);
end loop;
end process;

14
src/cpu.vhdl
View file

@ -9,10 +9,8 @@ port (
btn: in std_logic_vector(31 downto 0);
sw: in std_logic_vector(31 downto 0);
led: out std_logic_vector(31 downto 0);
seg0: out std_logic_vector(31 downto 0);
seg1: out std_logic_vector(31 downto 0);
seg2: out std_logic_vector(31 downto 0);
seg3: out std_logic_vector(31 downto 0)
segv: out std_logic_vector(31 downto 0);
segs: out std_logic_vector(31 downto 0)
);
end circuit;
@ -71,11 +69,11 @@ architecture description of circuit is
begin
seg0(6 downto 0) <= dec7seg(reg_out(7 downto 4));
seg0(14 downto 8) <= dec7seg(reg_out(3 downto 0));
segs(6 downto 0) <= dec7seg(reg_out(7 downto 4));
segs(14 downto 8) <= dec7seg(reg_out(3 downto 0));
seg0(22 downto 16) <= dec7seg(reg_pc(7 downto 4));
seg0(30 downto 24) <= dec7seg(reg_pc(3 downto 0));
segs(22 downto 16) <= dec7seg(reg_pc(7 downto 4));
segs(30 downto 24) <= dec7seg(reg_pc(3 downto 0));
led(7 downto 0) <= std_logic_vector(reg_a);
led(23 downto 16) <= std_logic_vector(reg_b);