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//! Support for the Maxim 7321 I2C 8-Port Open Drain port expander | ||
pub struct Max7321<M>(M); | ||
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/// MAX7321 "I2C Port Expander with 8 Open-Drain I/Os" | ||
impl<I2C> Max7321<shared_bus::NullMutex<Driver<I2C>>> | ||
where | ||
I2C: crate::I2cBus, | ||
{ | ||
pub fn new(i2c: I2C, a3: bool, a2: bool, a1: bool, a0: bool) -> Self { | ||
Self::with_mutex(i2c, a3, a2, a1, a0) | ||
} | ||
} | ||
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impl<I2C, M> Max7321<M> | ||
where | ||
I2C: crate::I2cBus, | ||
M: shared_bus::BusMutex<Bus = Driver<I2C>>, | ||
{ | ||
pub fn with_mutex(i2c: I2C, a3: bool, a2: bool, a1: bool, a0: bool) -> Self { | ||
Self(shared_bus::BusMutex::create(Driver::new( | ||
i2c, a3, a2, a1, a0, | ||
))) | ||
} | ||
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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), | ||
} | ||
} | ||
} | ||
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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>, | ||
} | ||
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pub struct Driver<I2C> { | ||
i2c: I2C, | ||
out: u8, | ||
addr: u8, | ||
} | ||
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impl<I2C> Driver<I2C> { | ||
pub fn new(i2c: I2C, a3: bool, a2: bool, a1: bool, a0: bool) -> Self { | ||
let addr = 0x60 | ((a3 as u8) << 3) | ((a2 as u8) << 2) | ((a1 as u8) << 1) | (a0 as u8); | ||
Self { | ||
i2c, | ||
out: 0xff, | ||
addr, | ||
} | ||
} | ||
} | ||
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impl<I2C: crate::I2cBus> crate::PortDriver for Driver<I2C> { | ||
type Error = I2C::BusError; | ||
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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(()) | ||
} | ||
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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)) | ||
} | ||
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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)) | ||
} | ||
} | ||
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#[cfg(test)] | ||
mod tests { | ||
use embedded_hal_mock::i2c as mock_i2c; | ||
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#[test] | ||
fn max7321() { | ||
let expectations = [ | ||
mock_i2c::Transaction::write(0b01101101, vec![0b11111111]), | ||
mock_i2c::Transaction::write(0b01101101, vec![0b11111011]), | ||
mock_i2c::Transaction::read(0b01101101, vec![0b01000000]), | ||
mock_i2c::Transaction::read(0b01101101, vec![0b10111111]), | ||
]; | ||
let mut bus = mock_i2c::Mock::new(&expectations); | ||
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let mut max = super::Max7321::new(bus.clone(), true, true, false, true); | ||
let mut max_pins = max.split(); | ||
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max_pins.p2.set_high().unwrap(); | ||
max_pins.p2.set_low().unwrap(); | ||
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assert!(max_pins.p6.is_high().unwrap()); | ||
assert!(max_pins.p6.is_low().unwrap()); | ||
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bus.done(); | ||
} | ||
} |
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