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pub struct Pcf8574<M>(M);
pub struct Pcf8574a<M>(M);
impl<I2C> Pcf8574<shared_bus::NullMutex<Driver<I2C>>>
where
I2C: crate::I2cBus,
{
pub fn new(i2c: I2C, a0: bool, a1: bool, a2: bool) -> Self {
Self::with_mutex(i2c, a0, a1, a2)
}
}
impl<I2C> Pcf8574a<shared_bus::NullMutex<Driver<I2C>>>
where
I2C: crate::I2cBus,
{
pub fn new(i2c: I2C, a0: bool, a1: bool, a2: bool) -> Self {
Self::with_mutex(i2c, a0, a1, a2)
}
}
impl<I2C, M> Pcf8574<M>
where
I2C: crate::I2cBus,
M: shared_bus::BusMutex<Bus = Driver<I2C>>,
{
pub fn with_mutex(i2c: I2C, a0: bool, a1: bool, a2: bool) -> Self {
Self(shared_bus::BusMutex::create(Driver::new(
i2c, false, a0, a1, a2,
)))
}
pub fn split<'a>(&'a mut self) -> Parts<'a, I2C, M> {
Parts {
p0: crate::Pin::new(0, &self.0),
p1: crate::Pin::new(1, &self.0),
p2: crate::Pin::new(2, &self.0),
p3: crate::Pin::new(3, &self.0),
p4: crate::Pin::new(4, &self.0),
p5: crate::Pin::new(5, &self.0),
p6: crate::Pin::new(6, &self.0),
p7: crate::Pin::new(7, &self.0),
}
}
}
impl<I2C, M> Pcf8574a<M>
where
I2C: crate::I2cBus,
M: shared_bus::BusMutex<Bus = Driver<I2C>>,
{
pub fn with_mutex(i2c: I2C, a0: bool, a1: bool, a2: bool) -> Self {
Self(shared_bus::BusMutex::create(Driver::new(
i2c, true, a0, a1, a2,
)))
}
pub fn split<'a>(&'a mut self) -> Parts<'a, I2C, M> {
Parts {
p0: crate::Pin::new(0, &self.0),
p1: crate::Pin::new(1, &self.0),
p2: crate::Pin::new(2, &self.0),
p3: crate::Pin::new(3, &self.0),
p4: crate::Pin::new(4, &self.0),
p5: crate::Pin::new(5, &self.0),
p6: crate::Pin::new(6, &self.0),
p7: crate::Pin::new(7, &self.0),
}
}
}
pub struct Parts<'a, I2C, M = shared_bus::NullMutex<Driver<I2C>>>
where
I2C: crate::I2cBus,
M: shared_bus::BusMutex<Bus = Driver<I2C>>,
{
pub p0: crate::Pin<'a, crate::mode::QuasiBidirectional, M>,
pub p1: crate::Pin<'a, crate::mode::QuasiBidirectional, M>,
pub p2: crate::Pin<'a, crate::mode::QuasiBidirectional, M>,
pub p3: crate::Pin<'a, crate::mode::QuasiBidirectional, M>,
pub p4: crate::Pin<'a, crate::mode::QuasiBidirectional, M>,
pub p5: crate::Pin<'a, crate::mode::QuasiBidirectional, M>,
pub p6: crate::Pin<'a, crate::mode::QuasiBidirectional, M>,
pub p7: crate::Pin<'a, crate::mode::QuasiBidirectional, M>,
}
pub struct Driver<I2C> {
i2c: I2C,
out: u8,
addr: u8,
}
impl<I2C> Driver<I2C> {
pub fn new(i2c: I2C, is_a_variant: bool, a0: bool, a1: bool, a2: bool) -> Self {
let addr = if is_a_variant {
0x38 | ((a2 as u8) << 2) | ((a1 as u8) << 1) | (a0 as u8)
} else {
0x20 | ((a2 as u8) << 2) | ((a1 as u8) << 1) | (a0 as u8)
};
Self {
i2c,
out: 0xff,
addr,
}
}
}
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> {
self.out |= mask_high as u8;
self.out &= !mask_low as u8;
self.i2c.write(self.addr, &[self.out])?;
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 mut buf = [0x00];
self.i2c.read(self.addr, &mut buf)?;
let in_ = buf[0] as u32;
Ok((in_ & mask_high) | (!in_ & mask_low))
}
}
#[cfg(test)]
mod tests {
use embedded_hal_mock::i2c as mock_i2c;
#[test]
fn pcf8574() {
let expectations = [
mock_i2c::Transaction::write(0x21, vec![0b11111111]),
mock_i2c::Transaction::write(0x21, vec![0b11111011]),
mock_i2c::Transaction::read(0x21, vec![0b01000000]),
mock_i2c::Transaction::read(0x21, vec![0b10111111]),
];
let mut bus = mock_i2c::Mock::new(&expectations);
let mut pcf = super::Pcf8574::new(bus.clone(), true, false, false);
let mut pcf_pins = pcf.split();
pcf_pins.p2.set_high().unwrap();
pcf_pins.p2.set_low().unwrap();
assert!(pcf_pins.p6.is_high().unwrap());
assert!(pcf_pins.p6.is_low().unwrap());
bus.done();
}
#[test]
fn pcf8574a() {
let expectations = [
mock_i2c::Transaction::write(0x39, vec![0b11111111]),
mock_i2c::Transaction::write(0x39, vec![0b11101111]),
mock_i2c::Transaction::read(0x39, vec![0b00000001]),
mock_i2c::Transaction::read(0x39, vec![0b11111110]),
];
let mut bus = mock_i2c::Mock::new(&expectations);
let mut pcf_a = super::Pcf8574a::new(bus.clone(), true, false, false);
let mut pcf_a_pins = pcf_a.split();
pcf_a_pins.p4.set_high().unwrap();
pcf_a_pins.p4.set_low().unwrap();
assert!(pcf_a_pins.p0.is_high().unwrap());
assert!(pcf_a_pins.p0.is_low().unwrap());
bus.done();
}
}
