use crate::I2cExt;
pub struct Pca9555<M>(M);
impl<I2C> Pca9555<core::cell::RefCell<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> Pca9555<M>
where
I2C: crate::I2cBus,
M: crate::PortMutex<Port = Driver<I2C>>,
{
pub fn with_mutex(i2c: I2C, a0: bool, a1: bool, a2: bool) -> Self {
Self(crate::PortMutex::create(Driver::new(i2c, a0, a1, a2)))
}
pub fn split(&mut self) -> Parts<'_, I2C, M> {
Parts {
io0_0: crate::Pin::new(0, &self.0),
io0_1: crate::Pin::new(1, &self.0),
io0_2: crate::Pin::new(2, &self.0),
io0_3: crate::Pin::new(3, &self.0),
io0_4: crate::Pin::new(4, &self.0),
io0_5: crate::Pin::new(5, &self.0),
io0_6: crate::Pin::new(6, &self.0),
io0_7: crate::Pin::new(7, &self.0),
io1_0: crate::Pin::new(8, &self.0),
io1_1: crate::Pin::new(9, &self.0),
io1_2: crate::Pin::new(10, &self.0),
io1_3: crate::Pin::new(11, &self.0),
io1_4: crate::Pin::new(12, &self.0),
io1_5: crate::Pin::new(13, &self.0),
io1_6: crate::Pin::new(14, &self.0),
io1_7: crate::Pin::new(15, &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_0: crate::Pin<'a, crate::mode::Input, M>,
pub io0_1: crate::Pin<'a, crate::mode::Input, M>,
pub io0_2: crate::Pin<'a, crate::mode::Input, M>,
pub io0_3: crate::Pin<'a, crate::mode::Input, M>,
pub io0_4: crate::Pin<'a, crate::mode::Input, M>,
pub io0_5: crate::Pin<'a, crate::mode::Input, M>,
pub io0_6: crate::Pin<'a, crate::mode::Input, M>,
pub io0_7: crate::Pin<'a, crate::mode::Input, M>,
pub io1_0: crate::Pin<'a, crate::mode::Input, M>,
pub io1_1: crate::Pin<'a, crate::mode::Input, M>,
pub io1_2: crate::Pin<'a, crate::mode::Input, M>,
pub io1_3: crate::Pin<'a, crate::mode::Input, M>,
pub io1_4: crate::Pin<'a, crate::mode::Input, M>,
pub io1_5: crate::Pin<'a, crate::mode::Input, M>,
pub io1_6: crate::Pin<'a, crate::mode::Input, M>,
pub io1_7: crate::Pin<'a, crate::mode::Input, M>,
}
#[allow(dead_code)]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum Regs {
InputPort0 = 0x00,
InputPort1 = 0x01,
OutputPort0 = 0x02,
OutputPort1 = 0x03,
PolarityInversion0 = 0x04,
PolarityInversion1 = 0x05,
Configuration0 = 0x06,
Configuration1 = 0x07,
}
impl From<Regs> for u8 {
fn from(r: Regs) -> u8 {
r as u8
}
}
pub struct Driver<I2C> {
i2c: I2C,
out: u16,
addr: u8,
}
impl<I2C> Driver<I2C> {
pub fn new(i2c: I2C, a0: bool, a1: bool, a2: bool) -> Self {
let addr = 0x20 | ((a2 as u8) << 2) | ((a1 as u8) << 1) | (a0 as u8);
Self {
i2c,
out: 0xffff,
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 u16;
self.out &= !mask_low as u16;
if (mask_high | mask_low) & 0x00FF != 0 {
self.i2c
.write_reg(self.addr, Regs::OutputPort0, (self.out & 0xFF) as u8)?;
}
if (mask_high | mask_low) & 0xFF00 != 0 {
self.i2c
.write_reg(self.addr, Regs::OutputPort1, (self.out >> 8) as u8)?;
}
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 io0 = if (mask_high | mask_low) & 0x00FF != 0 {
self.i2c.read_reg(self.addr, Regs::InputPort0)?
} else {
0
};
let io1 = if (mask_high | mask_low) & 0xFF00 != 0 {
self.i2c.read_reg(self.addr, Regs::InputPort1)?
} else {
0
};
let in_ = ((io1 as u32) << 8) | io0 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 u16, 0),
crate::Direction::Output => (0, mask as u16),
};
if mask & 0x00FF != 0 {
self.i2c.update_reg(
self.addr,
Regs::Configuration0,
(mask_set & 0xFF) as u8,
(mask_clear & 0xFF) as u8,
)?;
}
if mask & 0xFF00 != 0 {
self.i2c.update_reg(
self.addr,
Regs::Configuration1,
(mask_set >> 8) as u8,
(mask_clear >> 8) as u8,
)?;
}
Ok(())
}
}
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 u16),
true => (mask as u16, 0),
};
if mask & 0x00FF != 0 {
self.i2c.update_reg(
self.addr,
Regs::PolarityInversion0,
(mask_set & 0xFF) as u8,
(mask_clear & 0xFF) as u8,
)?;
}
if mask & 0xFF00 != 0 {
self.i2c.update_reg(
self.addr,
Regs::PolarityInversion1,
(mask_set >> 8) as u8,
(mask_clear >> 8) as u8,
)?;
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use embedded_hal_mock::eh1::i2c as mock_i2c;
#[test]
fn pca9555() {
let expectations = [
mock_i2c::Transaction::write(0x22, vec![0x02, 0xfe]),
mock_i2c::Transaction::write_read(0x22, vec![0x06], vec![0xff]),
mock_i2c::Transaction::write(0x22, vec![0x06, 0xfe]),
mock_i2c::Transaction::write(0x22, vec![0x02, 0x7e]),
mock_i2c::Transaction::write_read(0x22, vec![0x06], vec![0xfe]),
mock_i2c::Transaction::write(0x22, vec![0x06, 0x7e]),
mock_i2c::Transaction::write_read(0x22, vec![0x06], vec![0x7e]),
mock_i2c::Transaction::write(0x22, vec![0x06, 0xfe]),
mock_i2c::Transaction::write(0x22, vec![0x03, 0xfe]),
mock_i2c::Transaction::write_read(0x22, vec![0x07], vec![0xff]),
mock_i2c::Transaction::write(0x22, vec![0x07, 0xfe]),
mock_i2c::Transaction::write(0x22, vec![0x03, 0x7e]),
mock_i2c::Transaction::write_read(0x22, vec![0x07], vec![0xfe]),
mock_i2c::Transaction::write(0x22, vec![0x07, 0x7e]),
mock_i2c::Transaction::write_read(0x22, vec![0x07], vec![0x7e]),
mock_i2c::Transaction::write(0x22, vec![0x07, 0xfe]),
mock_i2c::Transaction::write(0x22, vec![0x02, 0x7f]),
mock_i2c::Transaction::write(0x22, vec![0x02, 0x7e]),
mock_i2c::Transaction::write(0x22, vec![0x03, 0x7f]),
mock_i2c::Transaction::write(0x22, vec![0x03, 0x7e]),
mock_i2c::Transaction::write_read(0x22, vec![0x00], vec![0x80]),
mock_i2c::Transaction::write_read(0x22, vec![0x00], vec![0x7f]),
mock_i2c::Transaction::write_read(0x22, vec![0x01], vec![0x80]),
mock_i2c::Transaction::write_read(0x22, vec![0x01], vec![0x7f]),
mock_i2c::Transaction::write_read(0x22, vec![0x04], vec![0x00]),
mock_i2c::Transaction::write(0x22, vec![0x04, 0x80]),
mock_i2c::Transaction::write_read(0x22, vec![0x04], vec![0xff]),
mock_i2c::Transaction::write(0x22, vec![0x04, 0x7f]),
mock_i2c::Transaction::write_read(0x22, vec![0x05], vec![0x00]),
mock_i2c::Transaction::write(0x22, vec![0x05, 0x80]),
mock_i2c::Transaction::write_read(0x22, vec![0x05], vec![0xff]),
mock_i2c::Transaction::write(0x22, vec![0x05, 0x7f]),
];
let mut bus = mock_i2c::Mock::new(&expectations);
let mut pca = super::Pca9555::new(bus.clone(), false, true, false);
let pca_pins = pca.split();
let mut io0_0 = pca_pins.io0_0.into_output().unwrap();
let io0_7 = pca_pins.io0_7.into_output().unwrap();
let io0_7 = io0_7.into_input().unwrap();
let mut io1_0 = pca_pins.io1_0.into_output().unwrap();
let io1_7 = pca_pins.io1_7.into_output().unwrap();
let io1_7 = io1_7.into_input().unwrap();
io0_0.set_high().unwrap();
io0_0.set_low().unwrap();
io1_0.set_high().unwrap();
io1_0.set_low().unwrap();
assert!(io0_7.is_high().unwrap());
assert!(io0_7.is_low().unwrap());
assert!(io1_7.is_high().unwrap());
assert!(io1_7.is_low().unwrap());
let mut io0_7 = io0_7.into_inverted().unwrap();
io0_7.set_inverted(false).unwrap();
let mut io1_7 = io1_7.into_inverted().unwrap();
io1_7.set_inverted(false).unwrap();
bus.done();
}
}