MSP430FR5994: LEA matrix dimension constraints for matrix multiplication

Hi,

Sorry, this question has probably been asked before, but I've run some tests (on small matrices) and i'm confused regarding the matrix dimension constraints, when performing matrix multiply using LEA (dsplib - msp_matrix_mpy_q15). There appears to be some discrepancies with the API documentation.

1) What are the matrix dimension constraints ?

E.g.

When HxW of A and B are : (1x4) * (4x2) and using the following values :

_q15 matA[1][4] = {
                         {_Q15(+0.01), _Q15(+0.02), _Q15(+0.03), _Q15(+0.04)}
                        };
    _q15 matB[4][2] = {
                         {_Q15(+0.005), _Q15(+0.01)},
                         {_Q15(+0.01), _Q15(+0.005)},
                         {_Q15(+0.005), _Q15(+0.01)},
                         {_Q15(+0.01), _Q15(+0.005)}
                        };

I get the correct results : 26, 22

But in the dsplib API , the matrix dimensions are supposed to be multiples of 2. If so, how come the above 2 input matrices result is correct ?

Is this an edge case where a 1xW matrix A works fine ? I have tested A(5x4) x B(4x2), this also works fine.

2) Can you confirm if the API documentation is accurate regarding the matrix dimensions needing to be multiples of 2 ?

http://software-dl.ti.com/msp430/msp430_public_sw/mcu/msp430/DSPLib/latest/exports/html/structmsp__matrix__mpy__q15__params.html

3) Does ONLY the ColA = RowB = must be multiple of 2 ? Does ColB also need to be multiple of 2 ?

As msp_matrix_mpy_q15 works like a vector-matrix multiplication (iteratively A_row x MatB), then does the rows of matrix A also need to be a multiple of 2 ?

thanks