DAC: Add test

tests/dac/Cargo.toml

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+[package]
+name = "riot-wrappers-test-dac"
+version = "0.1.0"
+authors = ["Christian Amsüss <[email protected]>"]
+edition = "2021"
+publish = false
+
+[lib]
+crate-type = ["staticlib"]
+
+[profile.release]
+panic = "abort"
+
+[dependencies]
+riot-wrappers = { version = "*", features = [ "set_panic_handler" ] }
+riot-sys = "*"
+
+[patch.crates-io]
+riot-sys = { git = "https://github.com/RIOT-OS/rust-riot-sys" }

tests/dac/Makefile

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+# name of your application
+APPLICATION = riot-wrappers-test-dac
+APPLICATION_RUST_MODULE = riot_wrappers_test_dac
+BASELIBS += $(APPLICATION_RUST_MODULE).module
+FEATURES_REQUIRED += rust_target
+FEATURES_REQUIRED += periph_dac
+
+# Of these boards it is known that DAC0 may be driven arbitrarily because it's
+# just a pin on the extension header. (It's probably true for most boards, but
+# so far nobody guarantees that. Just add your board here if your DAC0 pin is
+# good to use).
+BOARD_WHITELIST = stk3700
+
+include $(RIOTBASE)/Makefile.include

tests/dac/src/lib.rs

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+#![no_std]
+
+use riot_wrappers::dac;
+use riot_wrappers::riot_main;
+
+riot_main!(main);
+
+fn main() {
+    let mut dac = dac::DACLine::new(0).unwrap();
+    dac.set(655); // 1% of maximum value
+}