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Hello Ulrich, Saturday, January 04, 2003, 8:25:14 AM, you wrote: It would be a solution to declare func as func(int *x, int *a, int *y); Then you'll get &x in register A, and *sp(0) and *sp(1) for &a and &y. Thus you'll gain full access to Y. void p(int *a, int *b, int *c) { *c=*a+*b; return; } and the corresponding Assembler code is _p: PSHM AR1 FRAME #-1 STLM A,AR2 ; |2| STL A,*SP(0) ; |2| MVDK *SP(3),*(AR1) ; |3| LD *AR1,A ; |3| MVDK *SP(4),*(AR1) ; |3| ADD *AR2,A ; |3| FRAME #1 STL A,*AR1 ; |3| POPM AR1 RET ; return occurs UP> I want to call an Assembly routine from C program like: UP> main() UP> { UP> int A[3]; UP> int X[3]; UP> int Y[3]; UP> //store some values in arrays X, and A UP> //call Assembly function(func) to do some calculations and find array Y UP> from these 2 inputs UP> Y = func(&X, &A); UP> } -- Best regards, Michael Kapralov mailto: |
Re: Help in Assembly coding in 5416
Started by ●January 3, 2003
Reply by ●January 4, 20032003-01-04
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Hi, I have not done much assembly coding and hence I have the following doubt while coding in Assembly with a C5416 DSP: I want to call an Assembly routine from C program like: main() { int A[3]; int X[3]; int Y[3]; //store some values in arrays X, and A //call Assembly function(func) to do some calculations and find array Y from these 2 inputs Y = func(&X, &A); } Doubt: If I pass the arrays by Address,how do I read the parameters inside the Assembly function func? and store in some address locations,so that they can be fetched to calculate Y. Also how do I return the ARRAY Y from the function func? Any sample code,illustrations or suggestions may be very useful. Thanks & regards, ************************************************** M. ULRICH PRAKASH Networking Technologies Lab, HCL Technologies Ltd., 184 N S K Salai, Vadapalani, Chennai 600 026 Tel: 91 - 44 - 372 8366 x1136 Fax: 480 6640 Visit:: <http://voip.hcltech.com" target="_blank" rel="nofollow">http://voip.hcltech.com>http://voip.hcltech.com ********************************************************* "There is one corner of the universe you can be certain of improving, and that's your own self" ********************************************************* |
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Reply by ●January 5, 20032003-01-05
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Ulrich- Michael Kapralov's answer is very good, all your details are there. Trying to do Y = func(X, A) is sort of "MATLAB-like" and not easy in C54xx C/asm coding. But if Y is always either X or A or some offset from them, say Y is always X+N, where N=3 in your example below, then the asm. function can return a pointer value in acc A and store the results at X+N. You can get it to work, but it won't be obvious to other people and you should put some "large, noticeable" comments in there to explain it. Jeff Brower DSP sw/hw engineer Signalogic > I have not done much assembly coding and hence I have the following doubt > while coding in Assembly with a C5416 DSP: > > I want to call an Assembly routine from C program like: > main() > { > int A[3]; > int X[3]; > int Y[3]; > > //store some values in arrays X, and A > > //call Assembly function(func) to do some calculations and find array Y > from these 2 inputs > > Y = func(&X, &A); > > } > > Doubt: > If I pass the arrays by Address,how do I read the parameters inside the > Assembly function func? and store in some address locations,so that they > can be fetched to calculate Y. > Also how do I return the ARRAY Y from the function func? > > Any sample code,illustrations or suggestions may be very useful. > > Thanks & regards, > > ************************************************** > M. ULRICH PRAKASH > Networking Technologies Lab, > HCL Technologies Ltd., > 184 N S K Salai, > Vadapalani, Chennai 600 026 > Tel: 91 - 44 - 372 8366 x1136 Fax: 480 6640 > Visit:: <http://voip.hcltech.com" target="_blank" rel="nofollow">http://voip.hcltech.com>http://voip.hcltech.com > ********************************************************* > "There is one corner of the universe you can be > certain of improving, and that's your own self" > ********************************************************* |
