how to solve 2 or several differential matrix equations (a system of two equations including 2 matrix equations)?

Hi

How can I solve the following 2 equations, in which u and i are vector matrices:

diff(i) = A.u + B.i

diff(u) = C.u + D.i

NOTE :

All the parameters A, B, C, D and also u and i are matrices. At first glance, it looks like a "state space" model, but it's not so! In state-space model, the variants are NOT matrices but single variables, but in this case u and i are vectors (matrices).

Can someone help with that please?

thanks a lot