A simple HAL for the Cirrus Logic/Wolfson WM8731 audio codec IC.
eric-wood / wm8731 Goto Github PK
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License: MIT License
simple HAL-ish module for the WM8731 audio codec
License: MIT License
If I do something like (awkward naming aside, that's #1):
#[test]
fn bypass_button() {
let user_hit_the_bypass_button = true;
let result = WM8731::analog_audio_path(|w| {
if user_hit_the_bypass_button {
w.bypass().mic()
} else {
w.bypass().line_input()
}
});
assert_eq!(result.address, 4);
assert_eq!(result.value, 0b0000_1000);
}
the compile fails because a closure that captures (even immutably!) a variable is not an fn
type:
error[E0308]: mismatched types
--> src/lib.rs:203:48
|
203 | let result = WM8731::analog_audio_path(|w| {
| ________________________________________________^
204 | | if user_hit_the_bypass_button {
205 | | w.bypass().mic()
206 | | } else {
207 | | w.bypass().line_input()
208 | | }
209 | | });
| |_________^ expected fn pointer, found closure
|
= note: expected fn pointer `for<'r> fn(&'r mut AnalogAudioPath)`
found closure `[closure@src/lib.rs:203:48: 209:10]`
Since FnOnce is the most-permissive function-ey trait, the canonical signature would be pub fn analog_audio_path<F: FnOnce(&mut AnalogAudioPath)>(c: F) -> Register
(and so forth for the remaining functions of the WM8731
impl)
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