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2.8 KiB
2.8 KiB
DAC8550 - experimental
Arduino library for DAC8550 SPI Digital Analog Convertor.
Description
The DAC8550 is a SPI based 16 bit DAC with one channel.
WARNING this library is not tested with real hardware yet. It is derived from the DAC8551 library.
Interface
Core
- DAC8550(uint8_t slaveSelect) Constructor for hardware SPI, the slaveSelect pin needs to be defined.
- DAC8550(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 |
|---|---|
| DAC8550_POWERDOWN_NORMAL | 0 |
| DAC8550_POWERDOWN_1K | 1 |
| DAC8550_POWERDOWN_100K | 2 |
| DAC8550_POWERDOWN_HIGH_IMP | 3 |
Operation
See examples
Future
- testing with real hardware
- improve documentation
- improve code incl readability
- spiData => spiDataOut