Dear all,
I'm new on this forum and new in development with the FX3.
I would like to do a FIFO between an ADC (ADS1274 from TI) and the FX3 to get data in the FX3. Because of the sampling frequency, I need to use the "Frame-Sync interface" of the ADS1274 because the SPI cannot reach the speed requirement.
I would like to use the GPIF II interface of the FX3 and the DMA to transfert data to USB and maybe later, to an SD card (with an FX3S).
I do not need to have input signal with the "Frame-Sync interface" to get data from the ADC, only some output signals. Everything I need to make a state machine is just some counters and a very basic logic which can be easily programmed into the FX3.
I tried to work a while with GPIF II Designer and it is like the only signal I can use to change the state are the input signals which means I would need to make an external logic to do my application. It it what my company did with our last generation card: some logic ICs that made the control signals. But all this logic could be made in a very simple way in the firmware and would not require a huge CPU load. So my questions are:
- Could I make a state machine based on soft variables instead of hardware input (with no complex operation)?
- Can I write some code (like a counter and when the loop is done X times, the state will change?)
- Finally, do I really need to keep my logic circuits for my application?
Sorry, this is the very first time I use the FX3 and make this king of state machine. I understand that a state machine will change its state according to input signal, but do they need to be signal input and not software variables?
Best,
Christian
