Arduino library for DAC8552 SPI Digital Analog Convertor.

The DAC8552 is a SPI based 16 bit DAC with two channels.

The library supports both hardware SPI as software SPI (bit banging).

The two channels of the DAC8552 can be set individually with setValue(channel, value). However it is also possible to prepare one channel and have it set with the other channel simultaneously. This can be done with bufferValue().

The library has no function to set both values in one call e.g. set both to zero for an emergency stop or so.

Warning This library is not tested extensively.

Version 0.5.0 introduced a breaking change to improve handling the SPI dependency. The user has to call SPI.begin() or equivalent before calling DAC.begin(). Optionally the user can provide parameters to the SPI.begin(...).

Bugfix channel select bit, invalidates all pre 0.4.0 versions

The version 0.3.0 has breaking changes in the interface. The essence is removal of ESP32 specific code from the library. This makes it possible to support the ESP32-S3 and other processors in the future. Also it makes the library a bit simpler to maintain.

Note order of parameters changed.

• https://github.com/RobTillaart/DAC8550 1 channel, 16 bit
• https://github.com/RobTillaart/DAC8551 1 channel, 16 bit
• https://github.com/RobTillaart/DAC8552 2 channel, 16 bit
• https://github.com/RobTillaart/DAC8554 4 channel, 16 bit
• https://github.com/RobTillaart/MCP_DAC 1, 2 channel, 8,10,12 bit
• https://github.com/RobTillaart/AD5680 (18 bit DAC)
• https://github.com/RobTillaart/MAX520 I2C, 4, 8 channel, 8 bit
• https://github.com/RobTillaart/MCP4725 I2C, 1 channel, 12 bit

#include "DAC8552.h"

• DAC8552(uint8_t select, SPIClassRP2040 * spi = &SPI) Constructor HW SPI RP2040.
• DAC8552(uint8_t select, SPIClass * spi = &SPI) Constructor HW SPI other.
• DAC8552(uint8_t select, uint8_t spiData, uint8_t spiClock) Constructor SW SPI.
• DAC8532(...) idem constructors for DAC8532.
• void begin() initializes all pins to default state

• void bufferValue(uint8_t channel, uint16_t value) prepare a value for given channel. Will be set simultaneously with the next setValue().
• void setValue(uint8_t channel, uint16_t value) set the value of the chosen channel to 0 - 65535
• **uint16_t getValue(uint8_t channel)**returns the last value written.

To be used only if one needs a specific speed.

• void setSPIspeed(uint32_t speed) set SPI transfer rate.
• uint32_t getSPIspeed() returns SPI transfer rate.
• bool usesHWSPI() returns true if HW SPI is used.

Check datasheet for details.

• void bufferPowerDown(uint8_t channel, uint8_t powerDownMode) set power down mode. 0 - 3, but waits until (TODO CHECK DATASHEET)
• void setPowerDown(uint8_t channel, uint8_t powerDownMode) sets power down mode. 0 - 3.
• uint8_t getPowerDownMode(uint8_t channel) returns last written mode.

Note: examples might need to be adjusted to use free IO pins.

These are some examples

demo_hw_spi.ino

• write a sawtooth to channel A followed by a sinus
• uses HW SPI

demo_sw_spi.ino

• write a sawtooth to channel A followed by a sinus
• uses SW SPI

demo_same_time_write.ino

• writes two square waves that trigger at the same time

demo_sequential_write.ino

• writes two square waves sequentially (slight time difference)

demo_powerdown.ino

• idem

• improve documentation
• testing with hardware

• performance measurements

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