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stm32: automatically use refcounting for rcc bits used multiple times.

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This commit is contained in:
Dario Nieuwenhuis 2024-02-01 23:15:17 +01:00
parent b7bc31e51a
commit e7d1119750
1 changed files with 13 additions and 2 deletions
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15
embassy-stm32/build.rs
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@ -449,7 +449,16 @@ fn main() {
// ========
// Generate RccPeripheral impls
let refcounted_peripherals = HashSet::from(["usart", "adc", "can"]);
// count how many times each xxENR field is used, to enable refcounting if used more than once.
let mut rcc_field_count: HashMap<_, usize> = HashMap::new();
for p in METADATA.peripherals {
if let Some(rcc) = &p.rcc {
let en = rcc.enable.as_ref().unwrap();
*rcc_field_count.entry((en.register, en.field)).or_insert(0) += 1;
}
}
let force_refcount = HashSet::from(["usart"]);
let mut refcount_statics = BTreeSet::new();
for p in METADATA.peripherals {
@ -487,7 +496,9 @@ fn main() {
let en_reg = format_ident!("{}", en.register);
let set_en_field = format_ident!("set_{}", en.field);
let (before_enable, before_disable) = if refcounted_peripherals.contains(ptype) {
let refcount =
force_refcount.contains(ptype) || *rcc_field_count.get(&(en.register, en.field)).unwrap() > 1;
let (before_enable, before_disable) = if refcount {
let refcount_static =
format_ident!("{}_{}", en.register.to_ascii_uppercase(), en.field.to_ascii_uppercase());