I'm not sure I understand - if you concat both buffers then you have a 1024 item array that you want to FFT and you're back to square one?
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I'm not sure I understand - if you concat both buffers then you have a 1024 item array that you want to FFT and you're back to square one?