GY-63_MS5611/libraries/DAC8554

DAC8554

Arduino library for DAC8554 SPI Digital Analog Convertor.

Description

The DAC8554 is a SPI based 16 bit DAC with four channels.

Warning This library is not tested extensively

Interface

#include "DAC8554.h"

Core

• DAC8554(uint8_t slaveSelect, uint8_t address = 0) Constructor for hardware SPI, since 0.2.0 the slaveSelect pin needs to be defined.
• DAC8554(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect, uint8_t address = 0) Constructor for the software SPI
• void begin() initializes all pins to default state
• void setValue(uint8_t channel, uint16_t value) set the value of the channel to 0 - 65535
• void setSingleValue(uint8_t channel, uint16_t value) writes the value to the channel but does not affect buffered ones. TODO - elaborate.
• uint16_t getValue(uint8_t channel) 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.
• void setSinglePowerDown(uint8_t channel, uint8_t powerDownMode) does not affect other channels.

Power down mode	Value
DAC8554_POWERDOWN_NORMAL	0x00
DAC8554_POWERDOWN_1K	0x40
DAC8554_POWERDOWN_100K	0x80
DAC8554_POWERDOWN_HIGH_IMP	0xC0

Broadcast

• void bufferValue(uint8_t channel, uint16_t value) prepare a new value for a channel.
• void broadcastBuffer() write all buffers to all(up to 4) 8554's channel's.
• void broadcastValue(uint16_t value) write value to all(up to 4) 8554's channel's.
• void broadcastPowerDown(uint8_t powerDownMode) write powerDownMode to all 8554's channel's.

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_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

Future

Must

• improve documentation
• testing with hardware

Should

Could

• performance measurements

Wont

Support

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Thank you,