I can talk only about srm campus (katankakathur)
In the university building campus :
- Java green
- Techpark basement
- Chettinad palace
- There are small eateries spread around the campus such as café coffee day, shawarma stalls, etc
- There are even small canteens in select floors of the university building
In the Main campus,
- There is the general canteen near the gate which is open pretty much from 7:30 to 5 unlike others
Other than these, there are several eateries in the backstreet lane of potheri which is filled with them.