Struct I2cRequest

pub struct I2cRequest {
    pub i2c_address: u16,
    pub(crate) send_buf: [u8; 16],
    pub(crate) send_len: usize,
    pub(crate) sleep_time_millis: u64,
    pub(crate) expected_response_length: usize,
}

Fields

i2c_address: u16

I2C address of the bus participant

send_buf: [u8; 16]

input sequence to be sent to the bus participant

send_len: usize

The actual length of the command in the buffer.

sleep_time_millis: u64

sleep time in milliseconds before retrieving an answer from the bus participant

expected_response_length: usize

length of the expected response in byte

Implementations

impl I2cRequest

pub fn new( i2c_address: u16, send_slice: &[u8], sleep_time_millis: u64, expected_response_length: usize, ) -> Result<I2cRequest, I2cError>

Creates a new I2cRequest after validating the command length.

This constructor prepares a command for sending over the I2C bus. It takes a command as a slice, copies it into a fixed-size buffer, and packages it with the necessary metadata for the I2C interface to execute the request.

Arguments

• i2c_address - The 7-bit I2C address of the target device.
• send_slice - A byte slice (&[u8]) containing the command to be sent.
• sleep_time_millis - The duration in milliseconds to wait after sending the command before attempting to read a response.
• expected_response_length - The number of bytes expected in the response from the device.

Returns

A Result containing a new I2cRequest struct on success.

Errors

Returns an I2cError if the provided command is too large for the buffer:

• I2cError::CommandTooLong: If the length of send_slice exceeds the MAX_I2C_COMMAND_LENGTH constant.