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109 lines
3.6 KiB
Markdown
109 lines
3.6 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/DAC8551/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/DAC8551/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/DAC8551/blob/master/LICENSE)
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[](https://github.com/RobTillaart/DAC8551/releases)
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# DAC8551
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Arduino library for DAC8501 DAC8531, DAC8550, DAC8551 SPI Digital Analog Convertor.
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## Description
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The DAC8551 is a SPI based 16 bit DAC with one channel.
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The DAC8501, DAC8531 and DAC8550 are drop in compatible
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They all have classed derived 1 to 1 from DAC8551.
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**Warning** this library is not tested extensively.
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## Interface
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### Core
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- **DAC8501(uint8_t slaveSelect)** Constructor for DAC8501 with hardware SPI,
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- **DAC8531(uint8_t slaveSelect)** Constructor for DAC8531 with hardware SPI,
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- **DAC8550(uint8_t slaveSelect)** Constructor for DAC8550 with hardware SPI,
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- **DAC8551(uint8_t slaveSelect)** Constructor for DAC8551 with hardware SPI,
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since 0.2.0 the slaveSelect pin needs to be defined.
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- **DAC8501(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect)** Constructor for the software SPI
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- **DAC8531(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect)** Constructor for the software SPI
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- **DAC8550(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect)** Constructor for the software SPI
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- **DAC8551(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect)** Constructor for the software SPI
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- **void begin()** initializes all pins to default state
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- **void setValue(uint16_t value)** set the value of the channel to 0 - 65535
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- **uint16_t getValue()** returns the last value written.
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### Hardware SPI
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To be used only if one needs a specific speed.
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- **void setSPIspeed(uint32_t speed)** set SPI transfer rate.
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- **uint32_t getSPIspeed()** returns SPI transfer rate.
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- **bool usesHWSPI()** returns true if HW SPI is used.
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### ESP32 specific
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- **void selectHSPI()** in case hardware SPI, the ESP32 has two options HSPI and VSPI.
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- **void selectVSPI()** see above.
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- **bool usesHSPI()** returns true if HSPI is used.
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- **bool usesVSPI()** returns true if VSPI is used.
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The **selectVSPI()** or the **selectHSPI()** needs to be called
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BEFORE the **begin()** function.
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#### experimental
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- **void setGPIOpins(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t select)**
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overrule GPIO pins of ESP32 for hardware SPI.
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Needs to be called AFTER the **begin()** function.
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### Power down
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check datasheet for details.
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- **void setPowerDown(uint8_t powerDownMode)** sets power down mode. 0 - 3.
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- **uint8_t getPowerDownMode()** returns last written mode.
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| Power down mode | Value |
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|:---------------------------|:-----:|
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| DAC8551_POWERDOWN_NORMAL | 0 |
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| DAC8551_POWERDOWN_1K | 1 |
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| DAC8551_POWERDOWN_100K | 2 |
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| DAC8551_POWERDOWN_HIGH_IMP | 3 |
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Note: DAC8501, DAC8531 and DAC8550 uses the same constants.
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## Operation
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See examples
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**demo_hw_spi.ino**
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- write a sawtooth to channel A followed by a sinus
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- uses HW SPI
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**demo_sw_spi.ino**
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- write a sawtooth to channel A followed by a sinus
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- uses SW SPI
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**demo_powerdown.ino**
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- idem
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## Future
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- testing
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- verify replacement chips
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