Hello, I'm trying to access AD6641 registers via SPI to handle data from ultrasound pulses.
I wrote a test code with reference to this article: How to choose for read FIFO SPI interface for AD6641?
Unfortunately, however, it seems my AD6641 module cannot get into the FILL mode by an unknown reason.
I always get 0x04 when reading 0x10A (FIFO status) register, which means over-range.
But there is no explanation about over-range, and I even don't know what causes this phenomenon.
Is there any workaround to solve this problem, or is it a kind of hardware issue?
Any suggestions would be much appreciated.