Check interrupt existence in the caller's scope

This updates our `interrupt` macro, adapting it from a newer iteration
of `cortex-m-rt`'s. In particular, this makes generation of the sibling
`vector` module unneeded, since the check of whether the named interrupt
exists is done via checking a newly exported `Interrupt` enum in the
PAC (we use the path `::avr_device::Interrupt`, which does not require
avr_device to be imported in the caller's scope). There is one downside,
though: we can't enable more than one MCU feature, because that causes
duplicate items. As such, docs.rs now only builds for the `atmega328p`.

Cargo.toml

@@ -68,10 +68,8 @@ rt = ["avr-device-macros"]
 
 critical-section-impl = ["critical-section/restore-state-u8"]
 
-# Unfortunately, we can only build documentation for a subset of the supported
-# MCUs on docs.rs.  If you think a very popular chip is missing from the list,
-# feel free to add it here.
-docsrs = ["rt", "ufmt", "atmega328p", "atmega32u4", "atmega2560", "attiny85", "atmega4809"]
+# Unfortunately, we can only build documentation for a single MCU.
+docsrs = ["rt", "ufmt", "atmega328p"]
 
 [dependencies]
 bare-metal = "1.0.0"

Makefile

@@ -7,10 +7,9 @@ RUSTUP_TOOLCHAIN ?= nightly
 PATCHES := $(foreach chip, $(CHIPS), $(wildcard patch/$(chip).yaml))
 DEPS := $(foreach patch, $(PATCHES), $(patsubst patch/%.yaml, .deps/%.d, $(patch)))
 
-.PHONY: chips deps $(CHIPS) vector all clean
+.PHONY: chips deps $(CHIPS) all clean
 chips: $(CHIPS)
 deps: $(DEPS)
-vector: macros/src/vector.rs
 
 $(foreach chip, $(CHIPS), $(eval $(chip): src/devices/$(chip)/mod.rs))
 
@@ -53,12 +52,6 @@ src/devices/%/mod.rs: src/devices/%/mod.full.rs
 	@# Fixup the take() implementation
 	@sed -i'' -e '/#\[cfg(feature = "critical-section")]/d' $@
 	@sed -i'' -e 's/critical_section::with/crate::interrupt::free/' $@
-	@echo -e "\tGEN-VECTOR\t>macros/src/vector.rs"
-	@./gen-intr-lut.sh svd/*.patched >macros/src/vector.rs
-
-macros/src/vector.rs: svd/*.patched
-	@echo -e "\tGEN-VECTOR\t>macros/src/vector.rs"
-	@./gen-intr-lut.sh $^ >$@
 
 clean:
 	@echo -e "\tCLEAN\t\t./svd/"
@@ -69,8 +62,6 @@ clean:
 	@rm -f src/generic.rs
 	@echo -e "\tCLEAN\t\t./.deps/"
 	@rm -rf .deps/
-	@echo -e "\tCLEAN\t\t./macros/src/vector.rs"
-	@rm -rf macros/src/vector.rs
 
 # Patch dependencies
 patch/%.yaml: .deps/%.d

examples/atmega328p/src/main.rs

@@ -35,7 +35,7 @@ fn panic(_info: &core::panic::PanicInfo) -> ! {
     }
 }
 
-#[avr_device::interrupt(atmega328p)]
+#[avr_device::interrupt]
 fn TIMER0_OVF() {
     // This interrupt should raise every (1024*255)/16MHz s ≈ 0.01s
     // We then count 61 times to approximate 1s.