Audio mixing in McASP with OMAP-L13x

Anyone know where I would start learning code to mix audio channels from McASP.

I have the PDK demo version of McASP audio passthrough working.

Does anyone have example code of something like this working with McASP already I could take a look at?

// 5 channel mixer algorithm in 32 bit without clipping ?

#define     c1   0x19999999        // c1 = 0.2
#define     c2   0x0CCCCCCC    // c2 = 0.1
#define     c3   0x26666666        // c3 = 0.3
#define     c4   0x06666666        // c4 = 0.05
#define     c5   0x39999999        // c5 = 0.45  


// somewhere inside McASP Receive Interrupt Service Routine????


// copy input samples from channels //

r1 = dm(channel_1);    {audio channel 1 input sample}
r2 = dm(channel_2);    {audio channel 2 input sample}
r3 = dm(channel_3);    {audio channel 2 input sample}
r4 = dm(channel_4);    {audio channel 2 input sample}
r5 = dm(channel_5);    {audio channel 2 input sample}

r6 = c1;
mrf = r6 * r1 (ssf);          {mrf = c1*x1}

r7 = c2;
mrf = mrf + r7 * r2 (ssf);    {mrf = c1*x1 + c2*x2}

r8 = c3;
mrf = mrf + r4 * r2 (ssfr);   {mrf = c1*x1 + c2*x2 + c3*x3}

r9 = c4;
mrf = mrf + r4 * r2 (ssfr);    {mrf = c1*x1 + c2*x2 + c3*x3 + c4*x4}

r10 = c5;
mrf = mrf + r4 * r2 (ssfr);    {mrf = y= c1*x1 + c2*x2 + c3*x3 + c4*x4 + c5*x5}


mrf = sat mrf;    /// What is SAT ? what is this doing ?? also what is ssf and ssfr timing or frames ???



// copy mixed channels to both left and right channels ready to go to balance mix code…?


r0 = mrf;       /// was written as mr1f  ,, must have been a typo?? changed to mrf

dm(left_output) = r0; {left output sample}
dm(right_output) = r0; {right output sample}