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README.md 0.2.5 DAC8551 2021-12-15 12:34:24 +01:00

README.md

Arduino CI Arduino-lint JSON check License: MIT GitHub release

DAC8551

Arduino library for DAC8501 DAC8531, DAC8550, DAC8551 SPI Digital Analog Convertor.

Description

The DAC8551 is a SPI based 16 bit DAC with one channel.

The DAC8501, DAC8531 and DAC8550 are drop in compatible They all have classed derived 1 to 1 from DAC8551.

Warning this library is not tested extensively.

Interface

Core

  • DAC8501(uint8_t slaveSelect) Constructor for DAC8501 with hardware SPI,
  • DAC8531(uint8_t slaveSelect) Constructor for DAC8531 with hardware SPI,
  • DAC8550(uint8_t slaveSelect) Constructor for DAC8550 with hardware SPI,
  • DAC8551(uint8_t slaveSelect) Constructor for DAC8551 with hardware SPI, since 0.2.0 the slaveSelect pin needs to be defined.
  • DAC8501(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect) Constructor for the software SPI
  • DAC8531(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect) Constructor for the software SPI
  • DAC8550(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect) Constructor for the software SPI
  • DAC8551(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect) Constructor for the software SPI
  • void begin() initializes all pins to default state
  • void setValue(uint16_t value) set the value of the channel to 0 - 65535
  • uint16_t getValue() returns the last value written.

Hardware SPI

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.

ESP32 specific

  • void selectHSPI() in case hardware SPI, the ESP32 has two options HSPI and VSPI.
  • void selectVSPI() see above.
  • bool usesHSPI() returns true if HSPI is used.
  • bool usesVSPI() returns true if VSPI is used.

The selectVSPI() or the selectHSPI() needs to be called BEFORE the begin() function.

experimental

  • void setGPIOpins(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t select) overrule GPIO pins of ESP32 for hardware SPI. Needs to be called AFTER the begin() function.

Power down

check datasheet for details.

  • void setPowerDown(uint8_t powerDownMode) sets power down mode. 0 - 3.
  • uint8_t getPowerDownMode() returns last written mode.
Power down mode Value
DAC8551_POWERDOWN_NORMAL 0
DAC8551_POWERDOWN_1K 1
DAC8551_POWERDOWN_100K 2
DAC8551_POWERDOWN_HIGH_IMP 3

Note: DAC8501, DAC8531 and DAC8550 uses the same constants.

Operation

See 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_powerdown.ino

  • idem

Future

  • testing
  • verify replacement chips