Motorola DSP Developer's Kit

min-1c.asm

[y, index] = mot###_min( X )

Description

This function returns the smallest element of complex input vector X and its index

Input/Output

Input: Complex vector X, include real part Xr and imaginary part Xi

Output: scalar y, include yr (real data of the smallest element of X), yi (imaginary data of the smallest element of X), index

Algorithm

#define IN0
MinValue = Xr[0]* Xr[0] + Xi[0]* Xi[0];
yr = Xr[0];
yi = Xi[0];
Index = 0;
for(i=1; i<size; i++)
{
    Intervalue = Xr[i]* Xr[i] + Xi[i]* Xi[i];
    if(Intervalue < MinValue)
{
MinValue = Intervalue;
yr = Xr[i];
yi = Xi[i];
index = i;
}
}

Memory & Register

X memory IN_REAL = start address of real data

Y memory IN_IMAG = start address of imaginary data

IN = address offset of input complex vector X

Register X1 = real data of the result

Y1 = image data of the result

R1 = index of the result

R7 = number of items in the array

Status Register

The assembly function min-1c.asm does not explicitly set any status registers/bits during the function execution.

Data Size Limit

The length of vector X can't be larger than the continuous available data memory size.

Data Range Limit

Input data vector X range [-1.0, +1.0]

Precision

In the case of DSP563, precision is 23 bits.

In the case of DSP566, precision is 15 bits.

min-1r.asm

min-2r.asm