thermostat/src/ad5680.rs

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2020-03-13 04:27:03 +08:00
use embedded_hal::{
blocking::spi::Transfer,
digital::v2::OutputPin,
};
use stm32f4xx_hal::{
time::MegaHertz,
spi,
};
pub const SPI_MODE: spi::Mode = spi::Mode {
polarity: spi::Polarity::IdleHigh,
phase: spi::Phase::CaptureOnFirstTransition,
};
/// 30 MHz
pub const SPI_CLOCK: MegaHertz = MegaHertz(30);
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pub const MAX_VALUE: u32 = 0x20000;
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/// [AD5680](https://www.analog.com/media/en/technical-documentation/data-sheets/AD5680.pdf) DAC
pub struct Dac<SPI: Transfer<u8>, S: OutputPin> {
spi: SPI,
sync: S,
}
impl<SPI: Transfer<u8>, S: OutputPin> Dac<SPI, S> {
pub fn new(spi: SPI, mut sync: S) -> Self {
let _ = sync.set_high();
Dac {
spi,
sync,
}
}
fn write(&mut self, mut buf: [u8; 3]) -> Result<(), SPI::Error> {
let _ = self.sync.set_low();
let result = self.spi.transfer(&mut buf);
let _ = self.sync.set_high();
result.map(|_| ())
}
/// value: `0..0x20_000`
pub fn set(&mut self, value: u32) -> Result<(), SPI::Error> {
let buf = [
(value >> 14) as u8,
(value >> 6) as u8,
(value << 2) as u8,
];
self.write(buf)
}
}