SPI pins on the DUE are on the central connector labelled 'SPI'. The pinout published for the DUE was changed a couple of days ago after I pointed out to them that they had the SPI pins labelled incorrectly. You must specify each pin you wish to use as CS for the SPI devices. You want to follow the Graynomad pinout diagram. The extended API can use pins 4, 10, and 52 for CS. It is possible to use these extended methods, or the AVR-based ones. On the Arduino Due, the SAM3X has advanced SPI capabilities. This of course depends on your application and when the data you want to send over SPI is available. Use SPISettings with SPI.beginTransaction() to configure SPI parameters. What this means is you initialize the SPI with the SS pin you are using: SPI.begin(10) Then you send and receive using the 'continuation' versions of the SPI transfer function: SPI.transfer(10, 0, SPICONTINUE) SPI. You may find an interrupt-driven or DMA-driven way of driving the SPI to be far more performant. Description This library allows you to communicate with SPI devices, with the Arduino as the controller device. Extra on-board peripherals: The UNO R4 Minima introduces a range of on-board peripherals, including a 12-bit DAC, CAN BUS, and OP AMP. Arduino Due has three exposed pins for the devices Slave Select (SS) lines (pins 4, 10, and 52). If using the SPI.h library, make sure you give it as much data as you can in one go, aka the transfer() function that takes a whole byte array.Minimize the runtime of the code executed between two SPI transfers.If you do a ADC reading between each transfer, that’s of course going to delay stuff. It’s hard to judge what code is being executed between one SPI transfer to the next since the code is not given. 1 DmitryGrigoryev /en/uploads/Main/arduino-Due-schematic.pdf -> SPI header pin 4 is PA26. The SPI of the Due has also advanced features that can be used with the Extended SPI methods for Due. The clock divider affects the frequency of SPI clock of the transfer, it doesn’t change the processing / computation delay your sketch has between the end of one SPI transfer to the start of the next one. I tried to change the ClockDivider but surprisingly the time difference between two 16-bit transfer packages didn’t change.
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