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use crate::toolchains::map_signal_type_to_lattice_string;
use rust_hdl::core::prelude::*;
use std::collections::HashMap;
#[derive(Default)]
struct LPFGenerator {
path: NamedPath,
namespace: NamedPath,
lpf: Vec<String>,
names: HashMap<usize, String>,
}
impl Probe for LPFGenerator {
fn visit_start_scope(&mut self, name: &str, _node: &dyn Block) {
let _top_level = self.path.to_string();
self.path.push(name);
self.namespace.reset();
}
fn visit_start_namespace(&mut self, name: &str, _node: &dyn Block) {
self.namespace.push(name);
}
fn visit_atom(&mut self, name: &str, signal: &dyn Atom) {
let namespace = self.namespace.flat("$");
let name = if namespace.is_empty() {
name.to_owned()
} else {
format!("{}${}", namespace, name)
};
for pin in &signal.constraints() {
self.names.insert(signal.id(), name.clone());
let prefix = if signal.bits() == 1 {
format!("{}", name)
} else {
format!("{}[{}]", name, pin.index)
};
match &pin.constraint {
Constraint::Location(l) => {
self.lpf
.push(format!("LOCATE COMP \"{}\" SITE \"{}\"", prefix, l));
}
Constraint::Kind(k) => {
let name = map_signal_type_to_lattice_string(k);
self.lpf
.push(format!("IOBUF PORT \"{}\" IO_TYPE={}", prefix, name))
}
Constraint::Timing(t) => {
let timing = match t {
Timing::Periodic(p) => {
format!(
"FREQUENCY PORT \"{prefix}\" {freq} MHz",
prefix = prefix,
freq =
((1000.0 / p.period_nanoseconds) * 10000.0).round() / 10000.0
)
}
Timing::Custom(c) => c.to_string(),
_ => unimplemented!("Unknown timing constraint for ECP5 generation"),
};
if !timing.is_empty() {
self.lpf.push(timing);
}
}
Constraint::Custom(s) => self.lpf.push(s.clone()),
Constraint::Slew(k) => {
let tag = match k {
SlewType::Fast => "FAST",
SlewType::Normal => "SLOW",
};
self.lpf
.push(format!("IOBUF PORT \"{}\" SLEWRATE={}", prefix, tag));
}
}
}
}
fn visit_end_namespace(&mut self, _name: &str, _node: &dyn Block) {
self.namespace.pop();
}
fn visit_end_scope(&mut self, _name: &str, _node: &dyn Block) {
self.path.pop();
}
}
pub fn generate_lpf<U: Block>(uut: &U) -> String {
let mut lpf = LPFGenerator::default();
uut.accept("top", &mut lpf);
let mut lpf_uniq = vec![];
lpf_uniq.push("BLOCK RESETPATHS".to_string());
lpf_uniq.push("BLOCK ASYNCPATHS".to_string());
for line in lpf.lpf {
if !lpf_uniq.contains(&line) {
lpf_uniq.push(line);
}
}
lpf_uniq.join(";\n") + ";\n"
}
