ard_newbie:
Wrong
I've tested both libraries using micros() and the turboSPI library was actually slower. What Am I doing wrong?
ard_newbie:
No
PieterP:
You'll probably want to look into DMA (direct memory access).
AFAIK, you can't use it "at the same time", because every time the SD card's CS pin goes high, the file is closed.
SD card uses SPI and requires the CS to be low, otherwise the file will close, unless you use a huge external RAM, reading or writing directly to or from the SD from a ADC or to an DAC, seems impossible. Am I wrong?
ard_newbie:
Yes - With a DUE clocked at 84 MHz, the DACs output frequency in free running mode is 1.68 MHz.
The problem is I have no idea how to do that.