use crate::I2cExt;
pub struct Pca9536<M>(M);
impl<I2C> Pca9536<core::cell::RefCell<Driver<I2C>>>
where
I2C: crate::I2cBus,
{
pub fn new(i2c: I2C) -> Self {
Self::with_mutex(i2c)
}
}
impl<I2C, M> Pca9536<M>
where
I2C: crate::I2cBus,
M: crate::PortMutex<Port = Driver<I2C>>,
{
pub fn with_mutex(i2c: I2C) -> Self {
Self(crate::PortMutex::create(Driver::new(i2c)))
}
pub fn split(&mut self) -> Parts<'_, I2C, M> {
Parts {
io0: crate::Pin::new(0, &self.0),
io1: crate::Pin::new(1, &self.0),
io2: crate::Pin::new(2, &self.0),
io3: crate::Pin::new(3, &self.0),
}
}
}
pub struct Parts<'a, I2C, M = core::cell::RefCell<Driver<I2C>>>
where
I2C: crate::I2cBus,
M: crate::PortMutex<Port = Driver<I2C>>,
{
pub io0: crate::Pin<'a, crate::mode::Input, M>,
pub io1: crate::Pin<'a, crate::mode::Input, M>,
pub io2: crate::Pin<'a, crate::mode::Input, M>,
pub io3: crate::Pin<'a, crate::mode::Input, M>,
}
#[allow(dead_code)]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum Regs {
InputPort = 0x00,
OutputPort = 0x01,
PolarityInversion = 0x02,
Configuration = 0x03,
}
impl From<Regs> for u8 {
fn from(r: Regs) -> u8 {
r as u8
}
}
const ADDRESS: u8 = 0x41;
pub struct Driver<I2C> {
i2c: I2C,
out: u8,
}
impl<I2C> Driver<I2C> {
pub fn new(i2c: I2C) -> Self {
Self { i2c, out: 0xff }
}
}
impl<I2C: crate::I2cBus> crate::PortDriver for Driver<I2C> {
type Error = I2C::BusError;
fn set(&mut self, mask_high: u32, mask_low: u32) -> Result<(), Self::Error> {
let previous = self.out;
self.out |= mask_high as u8;
self.out &= !mask_low as u8;
if self.out != previous {
self.i2c.write_reg(ADDRESS, Regs::OutputPort, self.out)
} else {
Ok(())
}
}
fn is_set(&mut self, mask_high: u32, mask_low: u32) -> Result<u32, Self::Error> {
Ok(((self.out as u32) & mask_high) | (!(self.out as u32) & mask_low))
}
fn get(&mut self, mask_high: u32, mask_low: u32) -> Result<u32, Self::Error> {
let in_ = self.i2c.read_reg(ADDRESS, Regs::InputPort)? as u32;
Ok((in_ & mask_high) | (!in_ & mask_low))
}
}
impl<I2C: crate::I2cBus> crate::PortDriverTotemPole for Driver<I2C> {
fn set_direction(
&mut self,
mask: u32,
dir: crate::Direction,
state: bool,
) -> Result<(), Self::Error> {
if dir == crate::Direction::Output {
use crate::PortDriver;
if state {
self.set(mask, 0)?;
} else {
self.set(0, mask)?;
}
}
let (mask_set, mask_clear) = match dir {
crate::Direction::Input => (mask as u8, 0),
crate::Direction::Output => (0, mask as u8),
};
self.i2c
.update_reg(ADDRESS, Regs::Configuration, mask_set, mask_clear)
}
}
impl<I2C: crate::I2cBus> crate::PortDriverPolarity for Driver<I2C> {
fn set_polarity(&mut self, mask: u32, inverted: bool) -> Result<(), Self::Error> {
let (mask_set, mask_clear) = match inverted {
false => (0, mask as u8),
true => (mask as u8, 0),
};
self.i2c
.update_reg(ADDRESS, Regs::PolarityInversion, mask_set, mask_clear)
}
}
#[cfg(test)]
mod tests {
use embedded_hal_mock::eh1::i2c as mock_i2c;
#[test]
fn pca9536() {
let expectations = [
mock_i2c::Transaction::write(super::ADDRESS, vec![0x01, 0xfe]),
mock_i2c::Transaction::write_read(super::ADDRESS, vec![0x03], vec![0xff]),
mock_i2c::Transaction::write(super::ADDRESS, vec![0x03, 0xfe]),
mock_i2c::Transaction::write_read(super::ADDRESS, vec![0x03], vec![0xfe]),
mock_i2c::Transaction::write(super::ADDRESS, vec![0x03, 0xfc]),
mock_i2c::Transaction::write_read(super::ADDRESS, vec![0x03], vec![0xfc]),
mock_i2c::Transaction::write(super::ADDRESS, vec![0x03, 0xfd]),
mock_i2c::Transaction::write(super::ADDRESS, vec![0x01, 0xfc]),
mock_i2c::Transaction::write(super::ADDRESS, vec![0x01, 0xfe]),
mock_i2c::Transaction::write(super::ADDRESS, vec![0x01, 0xfc]),
mock_i2c::Transaction::write_read(super::ADDRESS, vec![0x00], vec![0x01]),
mock_i2c::Transaction::write_read(super::ADDRESS, vec![0x00], vec![0x00]),
];
let mut bus = mock_i2c::Mock::new(&expectations);
let mut pca = super::Pca9536::new(bus.clone());
let pca_pins = pca.split();
let io0 = pca_pins.io0.into_output().unwrap();
let mut io1 = pca_pins.io1.into_output_high().unwrap();
let io0 = io0.into_input().unwrap();
io1.set_low().unwrap();
io1.set_high().unwrap();
io1.toggle().unwrap();
assert!(io0.is_high().unwrap());
assert!(io0.is_low().unwrap());
bus.done();
}
}