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use crate::syntax::ast::App;
use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use crate::{analyze::Analysis, codegen::util};
/// Generates code that runs before `#[init]`
pub fn codegen(app: &App, analysis: &Analysis) -> Vec<TokenStream2> {
let mut stmts = vec![];
let rt_err = util::rt_err_ident();
// Disable interrupts -- `init` must run with interrupts disabled
stmts.push(quote!(rtic::export::interrupt::disable();));
stmts.push(quote!(
// To set the variable in cortex_m so the peripherals cannot be taken multiple times
let mut core: rtic::export::Peripherals = rtic::export::Peripherals::steal().into();
));
let device = &app.args.device;
let nvic_prio_bits = quote!(#device::NVIC_PRIO_BITS);
// check that all dispatchers exists in the `Interrupt` enumeration regardless of whether
// they are used or not
let interrupt = util::interrupt_ident();
for name in app.args.dispatchers.keys() {
stmts.push(quote!(let _ = #rt_err::#interrupt::#name;));
}
let interrupt_ids = analysis.interrupts.iter().map(|(p, (id, _))| (p, id));
// Unmask interrupts and set their priorities
for (&priority, name) in interrupt_ids.chain(app.hardware_tasks.values().filter_map(|task| {
if util::is_exception(&task.args.binds) {
// We do exceptions in another pass
None
} else {
Some((&task.args.priority, &task.args.binds))
}
})) {
let es = format!(
"Maximum priority used by interrupt vector '{}' is more than supported by hardware",
name
);
// Compile time assert that this priority is supported by the device
stmts.push(quote!(
const _: () = if (1 << #nvic_prio_bits) < #priority as usize { ::core::panic!(#es); };
));
stmts.push(quote!(
core.NVIC.set_priority(
#rt_err::#interrupt::#name,
rtic::export::logical2hw(#priority, #nvic_prio_bits),
);
));
// NOTE unmask the interrupt *after* setting its priority: changing the priority of a pended
// interrupt is implementation defined
stmts.push(quote!(rtic::export::NVIC::unmask(#rt_err::#interrupt::#name);));
}
// Set exception priorities
for (name, priority) in app.hardware_tasks.values().filter_map(|task| {
if util::is_exception(&task.args.binds) {
Some((&task.args.binds, task.args.priority))
} else {
None
}
}) {
let es = format!(
"Maximum priority used by interrupt vector '{}' is more than supported by hardware",
name
);
// Compile time assert that this priority is supported by the device
stmts.push(quote!(
const _: () = if (1 << #nvic_prio_bits) < #priority as usize { ::core::panic!(#es); };
));
stmts.push(quote!(core.SCB.set_priority(
rtic::export::SystemHandler::#name,
rtic::export::logical2hw(#priority, #nvic_prio_bits),
);));
}
stmts
}
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