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SharedI2cBus

m5stack_core::io::shared_i2c

Struct SharedI2cBus

pub struct SharedI2cBus(/* private fields */);

Expand description

Shared I2C bus for cooperative tasks on APP core and init on PRO core.

§Safety

I2c<'static, Async> is !Send due to PhantomData<*const ()>. The unsafe impl Send/Sync covers only that peripheral-type constraint; access is safe because:

AW9523B init runs on PRO core before APP core starts (no concurrent access)
PPS/AXP2101 tasks run cooperatively on APP core (never truly concurrent) CriticalSectionRawMutex is used for correctness: the mutex flag check is guarded against preemption from any context, at the cost of a brief global spinlock per lock/unlock. Safe because the CS is held only for the flag check, not across the I2C transaction (the lock guard is released at the next .await).

Implementations§

impl SharedI2cBus

pub const fn new(i2c: I2c<'static, Async>) -> Self

pub fn lock( &self, ) -> impl Future<Output = MutexGuard<'_, CriticalSectionRawMutex, I2c<'static, Async>>>

Trait Implementations§

impl Send for SharedI2cBus

impl Sync for SharedI2cBus

Auto Trait Implementations§

impl !Freeze for SharedI2cBus

impl PsramSafe for SharedI2cBus

impl !RefUnwindSafe for SharedI2cBus

impl Unpin for SharedI2cBus

impl UnsafeUnpin for SharedI2cBus

impl !UnwindSafe for SharedI2cBus

Blanket Implementations§

impl<T> Any for T
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