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Completed, tested, debugged, and documented module bitlib
This commit is contained in:
Curtis F Kaylor
@@ -0,0 +1,70 @@
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Bit Manipulation Functions for C02 Programs
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This module contains functions to shift and rotate the bits in a byte,
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and to extract, combine, swap and duplicate nybbles in a byte.
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At the beginning of the program use the directives
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#include <stddef.h02>
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#include <bitlib.h02>
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The following functions are defined:
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r = shiftl(b,n) Shifts byte b by n bits to the left and returns
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the result in r. If n is 0, the byte is not
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shifted, and if n greater than 8, the returned
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value will be 0.
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r = shiftr(b,n) Shifts byte b by n bits to the right and returns
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the result in r. If n is 0, the byte is not
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shifted, and if n greater than 8, the returned
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value will be 0.
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r = rotl(b,n) Rotate byte b by n bits to the left and returns
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the result in r, with the high bit rotated into
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the low bit on each rotation. If n is 0, the
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byte is not rotated, and any value of n greater
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than 8, will return the same result as n modulo 8.
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r = rotr(b,n) Rotate byte b by n bits to the right and returns
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the result in r, with the high bit rotated into
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the low bit on each rotation. If n is 0, the
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byte is not rotated, and any value of n greater
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than 8, will return the same result as n modulo 8.
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b = pack(l,r); Packs the low nybbles of bytes l and r into a
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single byte, with l becoming the left (or high)
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nybble and r becoming the right (or low) nybble.
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and returns the packed byte in b.
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l,r = unpack(b); Unpacks byte b, returning the left (or high)
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nybble in l, and the right (or low) nybble in r.
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d = dupl(b); Duplicates the low nybble of byte b into the
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high nybble and returns the new byte in d.
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Note: Executes function pack() with b as both
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arguments.
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d = swap(b); Swaps the left (or high) and right (or low)
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nybbles of byte b and returns the new byte in d.
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Note: Executes function rotl() with the arguments
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b and 4.
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c,d,e = func(a,&d); Stores the input value a and the address of d
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in memory.
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Returns three bytes read from memory.
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Note: Writes argument a to variable arg0,
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the address of d to variables adr0 and adr1,
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and returns the values of variables var0,
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var1, and var2.
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Note: This library expects the following external variables to be defined:
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temp0: Temporary Variable
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@@ -0,0 +1,103 @@
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; C02 Module bitlib.h02 Assembly Language Subroutines
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; Requires external location TEMP0 (system header)
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SUBROUTINE BITLIB
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;dupl(nybble) - Duplicate Low Order Nybble
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;Args: A = Left Nybble
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;Destroys: TEMP0
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;Affects: Y
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;Returns: A = Byte Containing Byte
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DUPL: TAY ;Copy Left Nybble to Right
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BEQ PACK ;If Zero, Return
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;pack(nybble,nybble) - Pack Two Low Order Nybbles into Single Byte
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;Args: A = Left Nybble
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; Y = Right Nybble
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;Destroys: TEMP0
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;Returns: A = Packed Byte
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PACK: ASL ;Shift Right Nybble to High Order
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ASL
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ASL
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ASL
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STA TEMP0 ;and Save It
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TYA ;Get Right Nybble
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AND #$0F ;Isolate Right Nybble
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ORA TEMP0 ;Copy in Left Nybble
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RTS
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;unpack(byte) - Unpack Byte into Two Low Order Nybbles
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;Args: A = Byte to Unpack
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;Returns: A = Left Nybble
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; Y = Right Nybble
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UNPACK: PHA ;Save Byte
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AND #$0F ;Isolate Right Nybble
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TAY ;and Copy to Y Register
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PLA ;Retrieve Byte
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LSR ;and Shift Left Nybble to Low Order
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LSR
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LSR
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LSR
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RTS
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;swap(byte) - Swap Low and High Nybbles in Byte
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;Args: A = Byte to Swap
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;Affects Y,N,Z,C
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;Returns: A = Swapped Byte
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SWAP: LDY #4 ;Set Count to 4 and Rotate Left
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;rotl(byte,count) - Rotate byte by count Bits to the Left
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;Args = Byte to Rotate
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;Y = Number of Bits to Rotate
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;Affects Y,N,Z,C
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;Returns: A = Rotated Byte
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ROTL: CPY #0 ;If Number of Bits is 0
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BEQ .RETURN ; Return
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.LOOPRL CLC ;Bit 0 will be 0
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ROL ;Rotate Left
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ADC #0 ; Copy Carry to Bit 0
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DEY ;Decrement Counter
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BNE .LOOPRL ; and Loop if Not 0
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.RETURN RTS
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;rotr(byte,count) - Shift byte by count Bits to the Right
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;Args = Byte to Rotate
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;Y = Number of Bits to Rotate
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;Affects Y,N,Z,C
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;Returns: A = Rotated Byte
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ROTR: CPY #0 ;If Number of Bits is 0
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BEQ .RETURN ; Return
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.LOOPRR CLC ;Bit 7 will be 0
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ROR ;Rotate Right
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BCC .SKIPRR ;If Bit 0 was Set
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ORA #$80 ; Set Bit 8
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.SKIPRR DEY ;Decrement Counter
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BNE .LOOPRR ; and Loop if Not 0
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RTS
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;shiftl(byte,count) - Shift byte by Count bits to the Left
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;Args = Byte to Shift
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;Y = Number of Bits to Rotate
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;Affects Y,N,Z,C
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;Returns: A = Shifted Byte
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SHIFTL: CPY #0 ;If Number of Bits is 0
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BEQ .RETURN ; Return
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.LOOPSL ASL ;Shift Byte to Left
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DEY ;Decrement Counter
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BNE .LOOPSL ; and Loop if Not 0
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RTS
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;shiftr(byte,count) - Shift byte by Count bits to the Right
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;Args = Byte to Shift
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;Y = Number of Bits to Rotate
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;Affects Y,N,Z,C
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;Returns: A = Shifted Byte
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SHIFTR: CPY #0 ;If Number of Bits is 0
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BEQ .RETURN ; Return
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.LOOPSR LSR ;Shift Byte to Right
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DEY ;Decrement Counter
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BNE .LOOPSR ; and Loop if Not 0
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RTS
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ENDSUBROUTINE
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@@ -0,0 +1,50 @@
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/**********************************************
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* bitlib - Bit Manipulation Routines for C02 *
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**********************************************/
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/* Duplicate Low Order Nybble in Byte *
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* Args: char b - Byte to Duplicate *
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* Returns: char d - Duplicated Byte */
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char dupl();
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/* Pack Nybbles into Single Byte *
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* Args: char l - Left Nybble *
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* char r - Right Nybble *
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* Returns: char b - Packed Byte */
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char pack();
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/* Rotate Byte Left *
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* Args: char b - Byte to Rotate *
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* char n - Number of Bits *
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* Returns: char r - Rotated Byte */
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char rotl();
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/* Rotate Byte Right *
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* Args: char b - Byte to Rotate *
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* char n - Number of Bits *
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* Returns: char r - Rotated Byte */
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char rotr();
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/* Shift Byte Left *
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* Args: char b - Byte to Shift *
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* char n - Number of Bits *
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* Returns: char r - Shifted Byte */
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char shiftl();
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/* Shift Byte Right *
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* Args: char b - Byte to Shift *
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* char n - Number of Bits *
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* Returns: char r - Shifted Byte */
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char shiftr();
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/* Swap Nybbles in Byte *
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* Args: char b - Byte to Swap *
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* Returns: char d - Swapped Byte */
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char swap();
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/* Unpack Byte into Separate Nybbles *
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* Args: char b - Byte to Unpack *
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* Returns: char l - Left Nybble *
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* char r - Right Nybble */
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char unpack();
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@@ -0,0 +1,128 @@
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/*********************************
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* BITTEST - Test Module bitlib *
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*********************************/
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//Specify System Header using -H option
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#include <stddef.h02>
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#include <bitlib.h02>
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const char detail = #FALSE;
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char argone,argtwo,expone,exptwo,resone,restwo;
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char high,low,left,right;
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void pr1arg() {putchr(' ');prbyte(argone);putchr('=');prbyte(resone);}
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void pr2arg() {putchr(' ');prbyte(argone);putchr(',');prbyte(argtwo);
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putchr('=');prbyte(resone);}
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void pr2res() {putchr(' ');prbyte(argone);putchr('=');
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prbyte(resone);putchr(',');prbyte(restwo);}
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void prtok() {putstr(" OK"); newlin();}
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main:
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putstr("DUPL():");
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high = 0; low = 0;
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for (argone = 0; argone < $10; argone++) {
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expone = high | low; high = high + 16; low++;
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resone = dupl(argone); if (detail) pr1arg();
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if (resone <> expone) goto er1arg;
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}
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prtok();
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putstr("PACK():");
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high = 0;
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for (argone = 0; argone < $10; argone++) {
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low = 0;
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for (argtwo = 0; argtwo < $10; argtwo++) {
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expone = high | low; low++;
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resone = pack(argone,argtwo); if (detail) pr2arg();
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if (resone <> expone) goto er2arg;
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}
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high = high + 16;
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}
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prtok();
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putstr("UNPACK():");
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high = 0;
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for (expone = 0; expone < $10; expone++) {
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low = 0;
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for (exptwo = 0; exptwo < $10; exptwo++) {
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argone = high | low; low++;
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resone, restwo = unpack(argone); if (detail) pr2res();
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if (resone <> expone or restwo <> exptwo) goto er2arg;
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}
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high = high + 16;
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}
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prtok();
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putstr("SWAP():");
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high = 0;
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for (right = 0; right < $10; right++) {
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low = 0; left = 0;
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do {
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argone = high | low; low++;
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expone = left | right; left = left + 16;
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resone = swap(argone); if (detail) pr1arg();
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if (resone <> expone) goto er1arg;
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} while (left);
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high = high + 16;
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}
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prtok();
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putstr("ROTL():");
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argone = %10101010; expone = argone;
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for (argtwo = 0; argtwo < 9; argtwo++) {
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resone = rotl(argone, argtwo); if (detail) pr2arg();
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if (resone <> expone) goto er2arg;
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high = expone & $80; expone<<; if (high) expone++;
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}
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prtok();
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putstr("ROTR():");
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argone = %10101010; expone = argone;
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for (argtwo = 0; argtwo < 9; argtwo++) {
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resone = rotr(argone, argtwo); if (detail) pr2arg();
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if (resone <> expone) goto er2arg;
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low = expone & $01; expone>>; if (low) expone = expone | $80;
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}
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prtok();
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putstr("SHIFTL():");
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argone = %10101010; expone = argone;
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for (argtwo = 0; argtwo < 9; argtwo++) {
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resone = shiftl(argone, argtwo); if (detail) pr2arg();
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if (resone <> expone) goto er2arg;
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expone<<;
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}
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prtok();
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putstr("SHIFTR():");
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argone = %10101010; expone = argone;
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for (argtwo = 0; argtwo < 9; argtwo++) {
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resone = shiftr(argone, argtwo); if (detail) pr2arg();
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if (resone <> expone) goto er2arg;
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expone>>;
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}
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prtok();
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goto exit;
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er1arg:
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if (detail) newlin();
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putstr(" ARG $"); prbyte(argone); putstr(" RESULT $"); prbyte(resone);
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putstr(" EXPECTED $"); prbyte(expone); newlin();
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goto exit;
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er2arg:
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if (detail) newlin();
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putstr(" ARGS $"); prbyte(argone); putstr(",$"); prbyte(argtwo);
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putstr(" RESULT $"); prbyte(resone);
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putstr(" EXPECTED $"); prbyte(expone); newlin();
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goto exit;
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er2res:
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if (detail) newlin();
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putstr(" ARG $"); prbyte(argone); putstr(" RESULT $"); prbyte(resone);
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putstr(" EXPECTED $"); prbyte(expone); putstr(",$"); prbyte(exptwo);
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newlin();
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goto exit;
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@@ -0,0 +1,16 @@
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cleared iocb for channel 0
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cleared iocb for channel 1
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cleared iocb for channel 2
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cleared iocb for channel 3
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cleared iocb for channel 4
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cleared iocb for channel 5
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cleared iocb for channel 6
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cleared iocb for channel 7
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cleared iocb for channel 8
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cleared iocb for channel 9
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cleared iocb for channel 10
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cleared iocb for channel 11
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cleared iocb for channel 12
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cleared iocb for channel 13
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cleared iocb for channel 14
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cleared iocb for channel 15
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+56
-25
@@ -8,11 +8,19 @@
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char aa,xx,yy; //Function Arguments
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char i; //Loop Index
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char r,h,l; //Register#, MSB, LSB
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int v; //Register Contents
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const char rvals = {$0F,$F0, $1E,$E1, $2D,$D2, $3C,$C3, $4B,$B4, $5A,$A5, $69,$96, $78,$87,
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$80,$08, $91,$19, $A2,$2A, $B3,$B3, $C4,$4C, $D5,$5D, $E6,$6E, $F7,$7F};
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char rcomp[32];
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void clrabi() {for (i=0; i<=@rvals; i++) abi[i] = 0;}
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void prword() {putchr('$'); prbyte(y); prbyte(x); putchr(' ');}
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void putlin() {putstr(); newlin();}
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void error() {putlin(); goto exit;}
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void passed() {putlin("PASSED");}
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void prtadr(aa,yy,xx) {
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putchr('$');
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if (yy) prbyte(yy);
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@@ -22,32 +30,55 @@ void prtadr(aa,yy,xx) {
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main:
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//Print Register Addresses
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putstr("R0 "); prtadr(&R0); putstr(" R0L "); prtadr(&R0L); putstr(" R0H "); prtadr(&R0H); newlin();
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putstr("R1 "); prtadr(&R1); putstr(" R1L "); prtadr(&R1L); putstr(" R1H "); prtadr(&R1H); newlin();
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putstr("R2 "); prtadr(&R2); putstr(" R2L "); prtadr(&R2L); putstr(" R2H "); prtadr(&R2H); newlin();
|
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putstr("R3 "); prtadr(&R3); putstr(" R3L "); prtadr(&R3L); putstr(" R3H "); prtadr(&R3H); newlin();
|
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putstr("R4 "); prtadr(&R4); putstr(" R4L "); prtadr(&R4L); putstr(" R4H "); prtadr(&R4H); newlin();
|
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putstr("R5 "); prtadr(&R5); putstr(" R5L "); prtadr(&R5L); putstr(" R5H "); prtadr(&R5H); newlin();
|
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putstr("R6 "); prtadr(&R6); putstr(" R6L "); prtadr(&R6L); putstr(" R6H "); prtadr(&R6H); newlin();
|
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putstr("R7 "); prtadr(&R7); putstr(" R7L "); prtadr(&R7L); putstr(" R7H "); prtadr(&R7H); newlin();
|
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putstr("R8 "); prtadr(&R8); putstr(" R8L "); prtadr(&R8L); putstr(" R8H "); prtadr(&R8H); newlin();
|
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putstr("R9 "); prtadr(&R9); putstr(" R9L "); prtadr(&R9L); putstr(" R9H "); prtadr(&R9H); newlin();
|
||||
putstr("R10 "); prtadr(&R10); putstr(" R10L "); prtadr(&R10L); putstr(" R10H "); prtadr(&R10H); newlin();
|
||||
putstr("R11 "); prtadr(&R11); putstr(" R11L "); prtadr(&R11L); putstr(" R11H "); prtadr(&R11H); newlin();
|
||||
putstr("R12 "); prtadr(&R12); putstr(" R12L "); prtadr(&R12L); putstr(" R12H "); prtadr(&R12H); newlin();
|
||||
putstr("R13 "); prtadr(&R13); putstr(" R13L "); prtadr(&R13L); putstr(" R13H "); prtadr(&R13H); newlin();
|
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putstr("R14 "); prtadr(&R14); putstr(" R14L "); prtadr(&R14L); putstr(" R14H "); prtadr(&R14H); newlin();
|
||||
putstr("R15 "); prtadr(&R15); putstr(" R15L "); prtadr(&R15L); putstr(" R15H "); prtadr(&R15H); newlin();
|
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putstr("R0 "); prtadr(&abi.r0); putstr(" R0L "); prtadr(&abi.r0.lo); putstr(" R0H "); prtadr(&abi.r0.hi); newlin();
|
||||
putstr("R1 "); prtadr(&abi.r1); putstr(" R1L "); prtadr(&abi.r1.lo); putstr(" R1H "); prtadr(&abi.r1.hi); newlin();
|
||||
putstr("R2 "); prtadr(&abi.r2); putstr(" R2L "); prtadr(&abi.r2.lo); putstr(" R2H "); prtadr(&abi.r2.hi); newlin();
|
||||
putstr("R3 "); prtadr(&abi.r3); putstr(" R3L "); prtadr(&abi.r3.lo); putstr(" R3H "); prtadr(&abi.r3.hi); newlin();
|
||||
putstr("R4 "); prtadr(&abi.r4); putstr(" R4L "); prtadr(&abi.r4.lo); putstr(" R4H "); prtadr(&abi.r4.hi); newlin();
|
||||
putstr("R5 "); prtadr(&abi.r5); putstr(" R5L "); prtadr(&abi.r5.lo); putstr(" R5H "); prtadr(&abi.r5.hi); newlin();
|
||||
putstr("R6 "); prtadr(&abi.r6); putstr(" R6L "); prtadr(&abi.r6.lo); putstr(" R6H "); prtadr(&abi.r6.hi); newlin();
|
||||
putstr("R7 "); prtadr(&abi.r7); putstr(" R7L "); prtadr(&abi.r7.lo); putstr(" R7H "); prtadr(&abi.r7.hi); newlin();
|
||||
putstr("R8 "); prtadr(&abi.r8); putstr(" R8L "); prtadr(&abi.r8.lo); putstr(" R8H "); prtadr(&abi.r8.hi); newlin();
|
||||
putstr("R9 "); prtadr(&abi.r9); putstr(" R9L "); prtadr(&abi.r9.lo); putstr(" R9H "); prtadr(&abi.r9.hi); newlin();
|
||||
putstr("R10 "); prtadr(&abi.r10); putstr(" R10L "); prtadr(&abi.r10.lo); putstr(" R10H "); prtadr(&abi.r10.hi); newlin();
|
||||
putstr("R11 "); prtadr(&abi.r11); putstr(" R11L "); prtadr(&abi.r11.lo); putstr(" R11H "); prtadr(&abi.r11.hi); newlin();
|
||||
putstr("R12 "); prtadr(&abi.r12); putstr(" R12L "); prtadr(&abi.r12.lo); putstr(" R12H "); prtadr(&abi.r12.hi); newlin();
|
||||
putstr("R13 "); prtadr(&abi.r13); putstr(" R13L "); prtadr(&abi.r13.lo); putstr(" R13H "); prtadr(&abi.r13.hi); newlin();
|
||||
putstr("R14 "); prtadr(&abi.r14); putstr(" R14L "); prtadr(&abi.r14.lo); putstr(" R14H "); prtadr(&abi.r14.hi); newlin();
|
||||
putstr("R15 "); prtadr(&abi.r15); putstr(" R15L "); prtadr(&abi.r15.lo); putstr(" R15H "); prtadr(&abi.r15.hi); newlin();
|
||||
|
||||
//Test setabi() and getabi()
|
||||
for (i=0; i<=@rvals; i++) r0l[i] = 0; //Clear ABI Registers
|
||||
//inline $ff;
|
||||
setabi(@rvals, rvals); //Write to ABI Registers
|
||||
for (i=0; i<@rvals; i++) {
|
||||
if (!i&7) newlin();
|
||||
if (!i&1) putstr(" $");
|
||||
prbyte(R0l[i]);
|
||||
if (R0l[i] <> rvals[i]) {putstr("ERROR!"); goto exit;}
|
||||
putstr("SETABI(), GETABI() ");
|
||||
clrabi(); //Clear Registers
|
||||
i = 0;
|
||||
for (r=0; r<16; r++) {
|
||||
l = r | 16; h = r | 32;
|
||||
setabi(r, h, l);
|
||||
xx = abi[i]; i++;
|
||||
yy = abi[i]; i++;
|
||||
v = getabi(r);
|
||||
//newlin(); prhex(r); putchr(':'); prword(.,h,l); prword(.,yy,xx); prword(v);
|
||||
if (xx<>l or yy<>h) error("SETABI: WRITE ERROR");
|
||||
if (<v<>l or >v<>h) error("GETABI: READ ERROR");
|
||||
}
|
||||
passed();
|
||||
|
||||
goto exit;
|
||||
//Test setabi() and getabi()
|
||||
putstr("SETABR(), GETABR() ");
|
||||
for (i=0; i<=@rvals; i++) {
|
||||
abi[i] = 0; //Clear ABI Registers
|
||||
rcomp[i] = 0; //Clear Compare Array
|
||||
}
|
||||
//inline $ff;
|
||||
setabr(@rvals, rvals); //Write to ABI Registers
|
||||
getabr(@rcomp, rcomp); //Read from ABI Registers
|
||||
for (i=0; i<@rvals; i++) {
|
||||
//if (!i&7) newlin(); if (!i&1) putstr(" $"); prbyte(abi[i]);
|
||||
if (abi[i] <> rvals[i]) error("SETABR() WRITE ERROR");
|
||||
if (rcomp[i] <> rvals[i]) error("GETABR() READ ERROR");
|
||||
}
|
||||
if (abi[@rvals] <> 0) error("SETABR() OVERFLOW");
|
||||
if (rcomp[@rvals] <> 0) error("GETABR() OVERFLOW");
|
||||
passed();
|
||||
|
||||
goto exit;
|
||||
|
||||
Reference in New Issue
Block a user