stm32: refcount peripheral enable/disable
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3295ec94e5
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@ -308,6 +308,9 @@ fn main() {
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// ========
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// ========
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// Generate RccPeripheral impls
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// Generate RccPeripheral impls
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let refcounted_peripherals = HashSet::from(["ADC", "USART", "SPI", "I2C"]);
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let mut refcount_statics = HashSet::new();
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for p in METADATA.peripherals {
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for p in METADATA.peripherals {
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// generating RccPeripheral impl for H7 ADC3 would result in bad frequency
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// generating RccPeripheral impl for H7 ADC3 would result in bad frequency
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if !singletons.contains(&p.name.to_string())
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if !singletons.contains(&p.name.to_string())
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@ -344,11 +347,40 @@ fn main() {
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TokenStream::new()
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TokenStream::new()
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};
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};
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let ptype = p
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.name
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.replace(&['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'][..], "");
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let pname = format_ident!("{}", p.name);
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let pname = format_ident!("{}", p.name);
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let clk = format_ident!("{}", rcc.clock.to_ascii_lowercase());
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let clk = format_ident!("{}", rcc.clock.to_ascii_lowercase());
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let en_reg = format_ident!("{}", en.register.to_ascii_lowercase());
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let en_reg = format_ident!("{}", en.register.to_ascii_lowercase());
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let set_en_field = format_ident!("set_{}", en.field.to_ascii_lowercase());
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let set_en_field = format_ident!("set_{}", en.field.to_ascii_lowercase());
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let (before_enable, before_disable) = if refcounted_peripherals.contains(ptype.trim_start_matches("LP")) {
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let refcount_static =
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format_ident!("{}_{}", en.register.to_ascii_uppercase(), en.field.to_ascii_uppercase());
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refcount_statics.insert(refcount_static.clone());
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(
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quote! {
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use atomic_polyfill::Ordering;
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if refcount_statics::#refcount_static.fetch_add(1, Ordering::SeqCst) > 0 {
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return;
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}
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},
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quote! {
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use atomic_polyfill::Ordering;
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if refcount_statics::#refcount_static.fetch_sub(1, Ordering::SeqCst) > 1 {
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return;
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}
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},
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)
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} else {
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(TokenStream::new(), TokenStream::new())
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};
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g.extend(quote! {
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g.extend(quote! {
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impl crate::rcc::sealed::RccPeripheral for peripherals::#pname {
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impl crate::rcc::sealed::RccPeripheral for peripherals::#pname {
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fn frequency() -> crate::time::Hertz {
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fn frequency() -> crate::time::Hertz {
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@ -356,6 +388,7 @@ fn main() {
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}
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}
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fn enable() {
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fn enable() {
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critical_section::with(|_| {
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critical_section::with(|_| {
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#before_enable
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#[cfg(feature = "low-power")]
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#[cfg(feature = "low-power")]
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crate::rcc::clock_refcount_add();
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crate::rcc::clock_refcount_add();
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crate::pac::RCC.#en_reg().modify(|w| w.#set_en_field(true));
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crate::pac::RCC.#en_reg().modify(|w| w.#set_en_field(true));
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@ -364,6 +397,7 @@ fn main() {
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}
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}
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fn disable() {
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fn disable() {
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critical_section::with(|_| {
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critical_section::with(|_| {
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#before_disable
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crate::pac::RCC.#en_reg().modify(|w| w.#set_en_field(false));
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crate::pac::RCC.#en_reg().modify(|w| w.#set_en_field(false));
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#[cfg(feature = "low-power")]
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#[cfg(feature = "low-power")]
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crate::rcc::clock_refcount_sub();
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crate::rcc::clock_refcount_sub();
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@ -379,6 +413,21 @@ fn main() {
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}
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}
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}
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}
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let mut refcount_mod = TokenStream::new();
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for refcount_static in refcount_statics {
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refcount_mod.extend(quote! {
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pub(crate) static #refcount_static: AtomicU8 = AtomicU8::new(0);
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});
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}
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g.extend(quote! {
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mod refcount_statics {
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use atomic_polyfill::AtomicU8;
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#refcount_mod
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}
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});
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// ========
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// ========
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// Generate fns to enable GPIO, DMA in RCC
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// Generate fns to enable GPIO, DMA in RCC
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