A Digital-to-Analog Converter (DAC) transforms digital signals into analog signals by mapping digital values to specific voltages. This process effectively creates continuous analog waveforms from discrete digital data. DACs play a vital role in electronic systems by enabling the generation of diverse waveforms.

Initialization sequence

Note

1. First start by calling the initialization function of the DAC spin.dac.initConsValue(DAC_NUM).
2. Second enter the integer value to send to the DAC spin.dac.setConstValue(DAC_NUM, DAC_CHAN, DAC_VALUE)

Example

spin.dac.initConstValue(2); // DAC 2 initialization
spin.dac.setConstValue(2, 1, 2048);

Conversion from numerical to analog value

The value we can send to the DAC is an integer between 0 and 4096, this value is then converted to voltage between 0 and 2.048V. For example :

spin.dac.setConstValue(2, 1, 2048);

Generate a 1.024V signal.

dac value

Example

For a pratical example of the DAC see the example : - Signal generation

API Reference

Class DacHAL

ClassList > DacHAL

Public Functions

Type	Name
void	currentModeInit (uint8_t dac_number, hrtim_tu_t tu_src) Update slope compensation settings on a DAC using voltage values.
void	initConstValue (uint8_t dac_number) Initialize a DAC device in constant output mode.
void	setConstValue (uint8_t dac_number, uint8_t channel, uint32_t const_value) Set a constant analog output value on a DAC channel.
void	slopeCompensation (uint8_t dac_number, float32_t peak_voltage, float32_t low_voltage) Configure a DAC to operate in sawtooth waveform mode for current-mode control.

Public Functions Documentation

function currentModeInit

Update slope compensation settings on a DAC using voltage values.

void DacHAL::currentModeInit (
    uint8_t dac_number,
    hrtim_tu_t tu_src
)

Converts the given voltage values into digital DAC values and sets the DAC's sawtooth waveform reset and step parameters accordingly.

Parameters:

dac_number The DAC number (1 or 3).
peak_voltage The peak voltage value for the sawtooth ramp (reset level).
low_voltage The valley (starting) voltage of the ramp.

function initConstValue

Initialize a DAC device in constant output mode.

void DacHAL::initConstValue (
    uint8_t dac_number
)

Configures the specified DAC (1, 2, or 3) to output a constant analog value.

This includes setting the value to 0, enabling external output, and starting the DAC.

Parameters:

dac_number The DAC number (1, 2, or 3).

function setConstValue

Set a constant analog output value on a DAC channel.

void DacHAL::setConstValue (
    uint8_t dac_number,
    uint8_t channel,
    uint32_t const_value
)

Writes a raw 12-bit value to the selected DAC channel, provided the DAC is ready.

Parameters:

dac_number The DAC number (1, 2, or 3).
channel The DAC output channel index (usually 1).
const_value The constant value to set (0–4095).

function slopeCompensation

Configure a DAC to operate in sawtooth waveform mode for current-mode control.

void DacHAL::slopeCompensation (
    uint8_t dac_number,
    float32_t peak_voltage,
    float32_t low_voltage
)

Initializes the DAC to produce a decrementing sawtooth waveform.

The DAC is triggered by the selected HRTIM timer unit to synchronize waveform generation with the PWM cycle.

Reset and step triggers are selected based on the tu_src.

Parameters:

dac_number The DAC number (1 or 3).
tu_src The HRTIM timer unit (TIMB to TIMF) used for synchronization.

The documentation for this class was generated from the following file docs/core/zephyr/modules/owntech_spin_api/zephyr/src/DacHAL.h