The PAK Math Library

The PAK-I, II, and IX have a simple Basic Stamp library that can help you get started with these chips. You don't have to use the library -- and you'll probably want to delete the parts you don't use to save space.

Remember, the general sequence of events is:

Load X and Y registers (floadx, floady, floadint)
Perform operations (fmult, fadd, etc.)
Read result (fdigit, fdump, fint+freadx, etc.)

Symbol	Type	Devices	Description
datap	I/O	All	Pin connected to PAK's data line (number)
datapin	I/O	All	Pin connected to PAK's data line (inx)
clk	I/O	All	Pin connected to PAK's clock line
en	I/O	All	Enable line (number; not required)
EnableBit	I/O	All	Enable line (inx; not required)
FSaturate	Constant	All	Used to set infinity saturation option
FRound	Constant	All	Used to set rounding on or off
fpstatus	Variable	All	Result of many operations
fpx	Variable	All	Input to many operations
fpdigit	Variable	All	Result of FDigit routine
fpxlow	Variable	All	Low part of X register
fpxhigh	Variable	All	High part of X register
fpxb0-fpxb3	Variable	All	X register as bytes
FReset	Sub	All	Reset communications (always call this first)
FBsyWait	Sub	All	Used to wait with EnableBit (not required)
FWaitData	Sub	All	Wait for operation to complete
fa2d	Sub	IX	Read A/D fpx=channel; fpb=# of samples
fa2dconf	Sub	IX	Configure A/D with value in fpx (0=normal; 1=AD3 is Vref+; 8=AD3 is Vref+, AD2 is Vref-)
festo	Sub	IX	Store data registers in EEPROM
fercl	Sub	IX	Recall data registers from EEPROM (automatic on power up)
fpoly	Sub	II, IX	Perform polynomial evaluation (fpb=register, fpx=degree)
fchs	Sub	All	Change sign of X register
fabs	Sub	All	Absolute value of X register
fsto	Sub	II,IX	Store X to register (register in fpx)
frcl	Sub	II,IX	Recall X from register (register in fpx)
fsto0	Sub	All	Store X in register 1
fsto1	Sub	All	Store X in register 2
frcl0	Sub	All	Recall register 1 to X
frcl1	Sub	All	Recall register 2 to X
floadx	Sub	All	Load fpxhigh/fpxlow to X register
floady	Sub	All	Load fpyhigh/fpylow to Y register
fzerox	Sub	All	X=0
fzeroy	Sub	All	Y=0
floadint	Sub	All	Put 16-bit integer in fpx into X as floating point number
fint	Sub	All	Convert X register to integer and read it to fpxhigh/fpxlow (24-bit integer) and fpx (16-bits)
freadx	Sub	All	Store X in fpxhigh/fpxlow (copy fpxlow to fpx)
fswap	Sub	All	Swap X and Y
fpi	Sub	All	X=pi
fe	Sub	All	X=e (natural log base)
fmult	Sub	All	X=X*Y
fdiv	Sub	All	X=X/Y
fadd	Sub	All	X=X+Y
fsub	Sub	All	X=X-Y
fgetdigit	Sub	All	Get a digit from X (fpx is digit #, 0 for sign)
fdump	Sub	All	Print X on debug terminal (fpx is # of digits to left of decimal point)
foption	Sub	All	Set options in fpx (saturate and/or round)
fxtoy	Sub	All	Y=X
fytox	Sub	All	X=Y
iodir	Sub	All	Set I/O direction (0=input, 1=output); input in fpx
iodir1	Sub	II	Set I/O direction for 2nd port
iowrite	Sub	All	Write to I/O port (value in fpx)
iowrite1	Sub	II	Write to 2nd port
ioread	Sub	All	Reads from I/O port (returns value in fpx)
ioread1	Sub	II	Reads from 2nd port
fsqrt	Sub	All	Square root of X (Newton method on PAK-I)
flog	Sub	II,IX	Natural log
flog10	Sub	II,IX	Common log
fexp	Sub	II,IX	Natural exponent
fexp10	Sub	II,IX	10**X
fpow	Sub	II,IX	X**Y
froot	Sub	II,IX	X**1/Y (root)
frecip	Sub	II,IX	Reciprocal
fsquare	Sub	All	Y=X*X (does not destroy Y)
fsin/fcos/ftan	Sub	II,IX	sine, cosine, tangent
farcsin/farccos/farctan	Sub	II,IX	arcsine, arccosine, arctangent

AWC Electronics - The PAK Math Library