For those worrying that [Faransky] is relying on the PWM functionality of the Arduino Nano to generate waveforms ... an interface to control it over SPI. Unfortunately, the AD9833 doesn’t ...

However, Arduino also offers this board without headers ... You'll notice a difference between the SPI and I2C/TWI pins, as well. On the Nano, the SPI pins are on digital pins D10 to D13, and ...

Not according to [techtoys], who has created an Arduino shield that creates an HDMI output from an SPI control input. This is a project that seems to have been around for a couple of years ...