pamoja_gpio/
error.rs

1//! The error type for on-board bus addressing and pin logic.
2
3/// What can go wrong forming an I2C address frame.
4#[derive(Clone, Copy, Debug, PartialEq, Eq)]
5pub enum GpioError {
6    /// An address is outside its range: a 7-bit address above `0x7F`, or a 10-bit address
7    /// above `0x3FF`.
8    AddressOutOfRange,
9    /// The caller's output buffer is too small to hold the address frame. A 7-bit address
10    /// needs one byte and a 10-bit address two;
11    /// [`Address::frame_len`](crate::i2c::Address::frame_len) gives the exact count.
12    BufferTooSmall,
13}
14
15impl core::fmt::Display for GpioError {
16    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
17        match self {
18            GpioError::AddressOutOfRange => f.write_str("I2C address is out of range"),
19            GpioError::BufferTooSmall => {
20                f.write_str("output buffer is too small for the I2C address frame")
21            }
22        }
23    }
24}
25
26// `core::error::Error` rather than `std::error::Error`, so a caller on a
27// microcontroller gets the same trait a caller on a gateway does.
28impl core::error::Error for GpioError {}
pamoja_gpio/error.rs

pamoja_gpio/
error.rs
