how to increase SPI speed?

Official Hardware Mega Due
1

I got an AD7356 ADC with a maximum sample rate of 5MS/s and therefor I need a higher SPI CLK speed than the default value of 4MHz.
I tried:

SPISettings ADC_settings(8000000,MSBFIRST,SPI_MODE3);

But the SCLK Freq. is still 4 MHz and CKGR_MOR |= (1 << MOSCRCF); doesn't work in the Arduino IDE, is there any chance to use the 8 MHz or 12 MHz CLK speed?

I use the IDE Version 1.6.4 is .transfer16() not supportet there?

Thanks for your help!

2

Hello Ard_Yun,

To speed up, you could try TurboSpi for DUE: GitHub - anydream/TurboSPI: This is another Arduino SPI library separated from SdFat library, it uses SPI registers and DMA (Arduino Due only) to accelerate SPI communication

3

Is it possible to access the uCs registers directly from the IDE?
It would be much easier to set the MainCLK of the ATSAM, which is runningin 4 Mhz default, up to 8 or 12 MHz by writing in the CKGR_MOR register.