Yet more I2S code

This time I2S slave receiver in three lines of XC

Operates in 24b resolution and outputs samples on channel c


in port bc, wc
in buffered port:32 d
clock cb

while (1) {
wc when pinsneq(lr) :> lr @ t
d @ (t + 24) :> x
c <: (bitrev(x) << 8)
}