dac8568

A platform agnostic library for the Texas Instruments DAC8568.

• https://crates.io/crates/dac8568

description

The DAC7568, DAC8168, and DAC8568 are low-power, voltage-output, eight-channel, 12-, 14- and 16-bit digital-to-analog converters, respectively. These devices include a 2.5V, 2ppm/°C internal reference (disabled by default), giving a full-scale output voltage range of 2.5V or 5V. The internal reference has an initial accuracy of 0.004% and can source up to 20mA at the VREFIN/VREFOUT pin. These devices are monotonic, providing excellent linearity and minimizing undesired code-to-code transient voltages (glitch). They use a versatile 3-wire serial interface that operates at clock rates up to 50MHz. The interface is compatible with standard SPI™, QSPI™, Microwire™, and digital signal processor (DSP) interfaces.

features

• Support for Texas Instruments DAC8568
• Heapless & no-std compatible
• Implemented with embedded-hal (https://docs.rs/embedded-hal/0.2.7/embedded_hal)
• Blocking and non-blocking support
• Basic feature set including synchronous static mode

wip features

Feel free to create an issue and PR if you would like to add support for the more advanced features

• Asynchronous modes utilizing the LDAC line
• Flexible mode
• Generic support for DAC7568 (12-Bit) and DAC8168 (14-Bit)

example

Note: Quick example based on the stm32h7xx-hal.

```rust // Initialise SPI. Ensure correct polarity and phase are respected let spi: Spi = interface.spi( (sck, NoMiso, mosi), spi::MODE1, // polarity: Polarity::IdleLow, // phase: Phase::CaptureOnSecondTransition, 10.mhz(), prec, clocks, ); // Initialise SYNC for SPI communications let sync = sync.intopushpulloutput(); // Initialize the dac instance let mut dac = dac8568::Dac::new(spi, sync); // Perform a software reset of DAC8568 to clear all registers dac.reset(); // Configure the DAC to use the internal 2.5v reference dac.useinternalreference().unwrap(); // Optionally, invert the output signal dac.setinvertedoutput(true); // Now transfer the data to update the DAC as a blocking call dac.set_voltage(dac8568::Channel::A, voltage).unwrap();

// Alternatively, you can maintain ownership of the SPI and SYNC if you need to use // asynchronous communication such as Interrupts and/or DMA. let (spi, sync) = dac.release(); // And then access the desired message directly let message = dac8568::Message::getvoltagemessage(dac8568::Channel::A, voltage, false); // Get the message data that can be transferred manually let payload = message.getpayloadbytes(); // And then write the message bytes to a DMA RAM buffer ```