I am researching the Waveshare High-Precision AD/DA Board. Why does this board use GPIO pins as "Chip Select" pins?
My understanding is that an SPI bus typically uses one of two "CE" pins for chip select. But the Waveshare board apparently uses GPIO. What might be the reasoning for this? And does this mean that the CEx pins are not used (i.e. not connected to either of the converter chips) at all?