ad57xx - Rust (original) (raw)

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§Driver for Analog Devices AD57xx series of dual and quad channel 16/14/12bit DACs

Compatibility has only been tested with the AD5754. However the only difference between the different chips is the channel count and the bit-depth. Readback operation is currently untested as my hardware does not support it. If you are in the opportunity to do so please let me know your findings.

Any contribution to this crate is welcome, as it’s my first published crate any feedback is appreciated.

§To-do:

• Register definitions
• Write functionality for all registers
• Minimal working example with a shared bus on stm32f4xx
• Dual channel chip support (untested)
• #[tests] on target
• Testing readback functionality
• Exclusive device struct
• Support daisy-chain operation
• Async support

§Usage example

// Setup the DAC's SPI bus and SYNC pin
let gpioc = p.GPIOC.split();
let spi3_sclk = gpioc.pc10.into_alternate();
let spi3_miso = gpioc.pc11.into_alternate();
let spi3_mosi = gpioc.pc12.into_alternate();
// We are using the ~SYNC pin as CS with ~LDAC tied to ground this puts
// the device in individual update mode, loading the dac register on each
// write operation
let gpioa = p.GPIOA.split();
let spi3_dac_sync = gpioa
    .pa15
    .into_push_pull_output_in_state(hal::gpio::PinState::High);
// SPI Instance initialization in MODE 2
let spi3 = Spi::new(
    p.SPI3,
    (spi3_sclk, spi3_miso, spi3_mosi),
    Mode {
            phase: hal::spi::Phase::CaptureOnFirstTransition,
            polarity: hal::spi::Polarity::IdleHigh,
    },
    1.MHz(),
    &ccdr,
);
// SPI Bus creation using embedded-hal-bus
let spi_bus = RefCell::new(spi3);

// Creating shared DAC SPI Device
let mut dac = Ad57xxShared::new_ad57x4(RefCellDevice::new(&spi_bus, spi3_dac_sync, NoDelay));

// Setup the DAC as desired.
dac.set_power(ad57xx::ad57x4::Channel::AllDacs, true).unwrap();
dac.set_output_range(ad57xx::ad57x4::Channel::AllDacs, ad57xx::OutputRange::Bipolar5V)
    .unwrap();
// Output a value (left-aligned 16 bit)
dac.set_dac_output(ad57xx::ad57x4::Channel::DacA, 0x9000).unwrap();

ad57x2

Dual channel implementation

ad57x4

Quad channel implementation

Ad57xxShared

AD57xx DAC with shared SPI bus access

Config

Definition of the configuration in the Control Register

Command

Enum determining the contents of the Register and Address bits

Data

Data to send to this device

Error

Errors for this crate

Function

Address of a function in the control register

OutputRange

Available output ranges for the DAC channels. These values are valid with a reference input of 2.5V, if the reference voltage is different, consult the datasheet for the gains associated with these settings.

Ad57xx

Common functionality among the Ad57xx range