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thanks..

here my code, butt is still with errors. i think my mcu is slow for my application.

signed int32 inmultit;

signed int32 inmultire (signed int16 ARG1H, int16 ARG1L, signed int16 ARG2H ...

ok, but "var = _mul(x,y);" is for unsigned numbers. in my filter i have a lots of coefficients and samples signed. whas i have to use??? so, i need "mul" or anything like multiplie ...

I need a 16x 16 multiplier with sign. For up side code, the formula is:

RES3:RES0 = ARG1H:ARG1L • ARG2H:ARG2L
= (ARG1H • ARG2H • 216) +
(ARG1H • ARG2L • 28) ...

Hello,

For my FIR filter, I need a multiplier. I use pic18f2455 and I found on his datasheet (pp 98). This is asm code for hardware multiplier.

#asm
MOVF ARG1L, W
MULWF ARG2L ; ARG1L * ARG2 ...

I used ADC - ads8321 (16bit) and DAC max531. The read value from ADC is applied to a FIR filter with 31 coef, then send to DAC...

ok, this is my code:

int8 bin_to_hex (int bin)
{
int8 hex;
if ( bin == 0000) hex = 0x0;
if ( bin == 0001) hex = 0x1;
if ( bin == 0010) hex = ...

Hello,

I need to convert 16 bits Bin code(2) to 2 bytes Hexa (from an AD converter), then this 2bytes in Hexa(16) I need to convert to 12 bits Bin code (2). (for DA converter).

The problem is w ...