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3.2 KiB
3.2 KiB
DAC8552
Arduino library for DAC8552 SPI Digital Analog Convertor.
Description
The DAC8552 is a SPI based 16 bit DAC with two channels.
Warning This library is not tested extensively.
Interface
Core
- DAC8552(uint8_t slaveSelect) Constructor for hardware SPI, since 0.2.0 the slaveSelect pin needs to be defined.
- DAC8552(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect) Constructor for the software SPI
- void begin() initializes all pins to default state
- void bufferValue(uint8_t channel, uint16_t value)
- void setValue(uint8_t channel, uint16_t value) set the value of the chosen channel to 0 - 65535
- **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 bufferPowerDown(uint8_t channel, uint8_t powerDownMode) ets power down mode. 0 - 3, but waits until (TODO CHECK DATASHEET)
- void setPowerDown(uint8_t channel, uint8_t powerDownMode) sets power down mode. 0 - 3.
- uint8_t getPowerDownMode(uint8_t channel) returns last written mode.
| Power down mode | Value |
|---|---|
| DAC8552_POWERDOWN_NORMAL | 0 |
| DAC8552_POWERDOWN_1K | 1 |
| DAC8552_POWERDOWN_100K | 2 |
| DAC8552_POWERDOWN_HIGH_IMP | 3 |
Future
- testing
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