Add mixer command.

Only reads mixer values.

Author: thejpster

src/commands/mod.rs

@@ -11,6 +11,7 @@ mod hardware;
 mod input;
 mod ram;
 mod screen;
+mod sound;
 mod timedate;
 
 pub static OS_MENU: menu::Menu<Ctx> = menu::Menu {
@@ -29,6 +30,7 @@ pub static OS_MENU: menu::Menu<Ctx> = menu::Menu {
         &screen::CLS_ITEM,
         &input::KBTEST_ITEM,
         &hardware::SHUTDOWN_ITEM,
+        &sound::MIXER_ITEM,
     ],
     entry: None,
     exit: None,

src/commands/sound.rs

@@ -0,0 +1,41 @@
+//! Sound related commands for Neotron OS
+
+use crate::{osprintln, Ctx, API};
+
+pub static MIXER_ITEM: menu::Item<Ctx> = menu::Item {
+    item_type: menu::ItemType::Callback {
+        function: mixer,
+        parameters: &[],
+    },
+    command: "mixer",
+    help: Some("Control the audio mixer"),
+};
+
+/// Called when the "mixer" command is executed.
+fn mixer(_menu: &menu::Menu<Ctx>, _item: &menu::Item<Ctx>, _args: &[&str], _ctx: &mut Ctx) {
+    let api = API.get();
+    osprintln!("Mixers:");
+    for mixer_id in 0u8..=255u8 {
+        match (api.audio_mixer_channel_get_info)(mixer_id) {
+            neotron_common_bios::FfiOption::Some(mixer_info) => {
+                let dir_str = match mixer_info.direction {
+                    neotron_common_bios::audio::Direction::Input => "In",
+                    neotron_common_bios::audio::Direction::Loopback => "Loop",
+                    neotron_common_bios::audio::Direction::Output => "Out",
+                };
+                osprintln!(
+                    "#{}: {} ({}) {}/{}",
+                    mixer_id,
+                    mixer_info.name,
+                    dir_str,
+                    mixer_info.current_level,
+                    mixer_info.max_level
+                );
+            }
+            neotron_common_bios::FfiOption::None => {
+                // Run out of mixers
+                break;
+            }
+        }
+    }
+}