sawyer/picocalc-os-rs
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allow userapps to change sample rate of audio

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sawyer bristol
2025-11-19 11:02:44 -07:00
parent cf8c59f021
commit 50341507cd
4 changed files with 62 additions and 12 deletions
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18
userlib_sys/src/lib.rs
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@@ -12,7 +12,7 @@ use strum::{EnumCount, EnumIter};
pub type EntryFn = fn();
pub const SYS_CALL_TABLE_COUNT: usize = 14;
pub const SYS_CALL_TABLE_COUNT: usize = 15;
const _: () = assert!(SYS_CALL_TABLE_COUNT == SyscallTable::COUNT);
#[derive(Clone, Copy, EnumIter, EnumCount)]
@@ -30,8 +30,9 @@ pub enum SyscallTable {
ReadFile = 9,
WriteFile = 10,
FileLen = 11,
AudioBufferReady = 12,
SendAudioBuffer = 13,
ReconfigureAudioSampleRate = 12,
AudioBufferReady = 13,
SendAudioBuffer = 14,
}
#[unsafe(no_mangle)]
@@ -473,6 +474,17 @@ pub extern "C" fn file_len(str: *const u8, len: usize) -> usize {
}
}
pub type ReconfigureAudioSampleRate = extern "C" fn(sample_rate: u32);
#[allow(unused)]
pub fn reconfigure_audio_sample_rate(sample_rate: u32) {
unsafe {
let ptr = SYS_CALL_TABLE[SyscallTable::ReconfigureAudioSampleRate as usize];
let f: ReconfigureAudioSampleRate = core::mem::transmute(ptr);
f(sample_rate)
}
}
pub type AudioBufferReady = extern "C" fn() -> bool;
#[allow(unused)]