GY-63_MS5611/libraries/DAC8551

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 classes derived 1 to 1 from DAC8551.

Warning this library is not tested extensively.

Related

• https://github.com/RobTillaart/AD5680 (18 bit DAC)

Interface

#include "DAC8551.h"

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

Must

• improve documentation

Should

• testing (DAC8531 is verified, see example)
• verify replacement chips

Could

Wont

Support

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Thank you,