HI,everybody.I am new to hardware design and i currently doing a project regarding analog to digital data conversion.
I am comstructing an induction motor and working on the feedback part now. I am facing problems on the SPI and the hardware (ADC) testing.
1. I designed a VHDL code for the interface according to ADS7861 datasheet (I/O used: Chip select, clock, A0, Conversion start, serial data). The busy I/O port is new and confusing to me, so i didn't add into the interface as it is useless for me(my opinion- even i know it is used to trigger the conversion but i have make my design simple by using chip select to trigger conversion ). Well, the problem that i facing is if my code design which is totally out of the standard SPI format (MISO and MOSI that consist only 4 lines) can be used for SPI? IS it okay for me to ignore busy line?
2. I would like to ask the steps to test my ADC which i am using ADS7861 in my case. Do i need to fabricate all my components into PCB board then only i can test for my ADC?Can i just construct a simple circuit that consists only input and output of ADC and test it by applying the varying analog signal and obtaining output using oscilloscope?
3. I failed to obtain any equation of data conversion(analog to digital) from the ADS7861 datasheet. Without the euation, i have no idea how to test the ADC.