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