core.rs.html -- source (original) (raw)

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use byteorder::{ByteOrder, LittleEndian};

#[derive(Debug)] pub enum I2CError { NotSupported, Other(&'static str), }

pub type I2CResult = Result<T, I2CError>;

pub trait I2CDevice {

fn read(&mut self, data: &mut [u8]) -> I2CResult<()>;


fn write(&mut self, data: &[u8]) -> I2CResult<()>;


#[allow(unused_variables)]
fn smbus_write_quick(&mut self, bit: bool) -> I2CResult<()> {
    
    
    Err(I2CError::NotSupported)
}


fn smbus_read_byte(&mut self) -> I2CResult<u8> {
    let mut buf = [0_u8];
    try!(self.read(&mut buf));
    Ok(buf[0])
}


fn smbus_write_byte(&mut self, value: u8) -> I2CResult<()> {
    self.write(&mut [value])
}


fn smbus_read_byte_data(&mut self, register: u8) -> I2CResult<u8> {
    try!(self.smbus_write_byte(register));
    self.smbus_read_byte()
}


fn smbus_write_byte_data(&mut self, register: u8, value: u8) -> I2CResult<()> {
    self.write(&mut [register, value])
}


fn smbus_read_word_data(&mut self, register: u8) -> I2CResult<u16> {
    let mut buf: [u8; 2] = [0x00; 2];
    try!(self.smbus_write_byte(register));
    try!(self.read(&mut buf));
    Ok(LittleEndian::read_u16(&buf))
}


fn smbus_write_word_data(&mut self, register: u8, value: u16) -> I2CResult<()> {
    let mut buf: [u8; 3] = [register, 0, 0];
    LittleEndian::write_u16(&mut buf[1..], value);
    self.write(&buf)
}


fn smbus_process_word(&mut self, register: u8, value: u16) -> I2CResult<u16> {
    let mut buf: [u8; 2] = [0x00; 2];
    try!(self.smbus_write_word_data(register, value));
    try!(self.read(&mut buf));
    Ok(LittleEndian::read_u16(&buf))
}


#[allow(unused_variables)]
fn smbus_read_block_data(&mut self, register: u8) -> I2CResult<Vec<u8>> {
    Err(I2CError::NotSupported)
}


#[allow(unused_variables)]
fn smbus_write_block_data(&mut self, register: u8, values: &[u8]) -> I2CResult<()> {
    Err(I2CError::NotSupported)
}


#[allow(unused_variables)]
fn smbus_process_block(&mut self, register: u8, values: &[u8]) -> I2CResult<()> {
    Err(I2CError::NotSupported)
}

}