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SIXTEEN-BIT PULSE MEASUREMENT WITH FIVE-CYCLE DELAY
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This is an improvement on the 16-bit delay code that I presented in the rst edition of this book. PulseWidth is a 16-bit value that contains the number of times through the loop. The code that measures the pulse width for a high pulse is
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clrf PulseWidth clrf PulseWidth + 1 btfss PORTn, Bit goto $ - 1 ; Reset the Timer
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; Wait for the Pulse to go high
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incfsz PulseWidth, f ; Increment the Counter decf PulseWidth + 1, f btfsc PORTn, Bit ; Loop while Still High goto $ - 3 movf PulseWidth, w ; Make 16 Bit Result Valid addwf PulseWidth + 1, f
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DETECT A CHANGE IN A REGISTER
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Bob Fehrenbach has passed on a number of his snippets for inclusion on my Web page, and they have shown up in this book. The rst detects the change in a bit and saves the new data for later execution. This code can be used to detect changes in the I/O ports, timers, and other registers that can be updated externally to the software execution.
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movf Reg, w andlw Mask xorwf old, w btfsc STATUS, Z goto no_change xorwf old
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; Mask out unused bits ; Compare to previous value ; If Zero set, bits are the Same ; Bits are different, Store New ; pattern in old
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APPENDIX G
Generate Bar Code In .NET Framework
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TEST A BYTE WITHIN A RANGE
This is an algorithm that I continually reinvent (although I don t think I ve ever come up with anything as ef cient as Bob Fehrenbach s routine):
movf Num, w addlw 255 - hi_lim addlw hi_lim - lo_lim + 1 btfsc STATUS, C goto in_range
; Num is equal to -hi_lim ; Num is > 255 if it is above ; the lo-lim
SWAP THE CONTENTS OF W WITH A REGISTER
I know that this one has been around forever, but it never hurts to be reminded of it and to have it written down for easy access.
xorwf Reg, f xorwf Reg, w xorwf Reg, f ; ; ; ; ; w w w w w = = = = = w, Reg = w ^ (Reg Reg, Reg Reg, Reg Reg, Reg Reg ^ ^ w), = Reg = Reg = w w Reg = Reg ^ w ^ w ^ w ^ Reg
This algorithm for swapping values without a temporary value code can be implemented in C as
VariableA = VariableA ^ VariableB; VariableB = VariableB ^ VariableA; // A = A ^ B // B = B ^ A // = B ^ (A ^ B) // = A // A = (A ^ B) ^ A // = B
VariableA = VariableA ^ VariableB;
SWAP THE CONTENTS OF TWO REGISTERS
Using the algorithm from the preceding point, here s a fast snippet to swap the contents of two le registers:
movf subwf addwf subwf X, Y, X, Y, w w f f
; W = Y - X ; X = X + (Y - X) ; Y = Y - (Y - X)
COMPARE AND SWAP IF Y < X
Here s a compare and swap (uses the swap presented earlier):
REUSE, RETURN, AND RECYCLE
movf X, w subwf Y, w btfsc STATUS, C goto $ + 2 addwf X, f subwf Y, f
; ; ; ; ;
Is Y >= X If Carry Set, Yes Don t Swap Else, X = X + (Y - X) Y = Y - (Y - X)
CONVERT ASCII TO UPPER CASE
This is a practical application of the preceding snippet. I think that this subroutine demonstrates how the code works quite well.
ToUpper: addlw 255 - z addlw z - a + 1 btfss STATUS, C addlw h 20 addlw A return
; ; ; ; ;
Get the High limit Add Lower Limit to Set Carry If Carry Set, then Lower Case Carry NOT Set, Restore Character Add A to restore the Character
COUNTING THE NUMBER OF 1S IN A BYTE
If you re a regular on the PICList, you will know of Dmitry Kiryashov and his interest in providing the most ef cient routines possible for carrying out operations. The code below is his optimization of the classic problem of counting the number of 1s in a byte in 12 instructions/12 cycles.
; (c) 1998 by Dmitry Kirashov rrf X, w andlw 0x55 subwf X, f ; ; ; ; ; X Contains Byte -a-c-e-g ABCDEFGH where AB=a+b, etc. the same trick as in example_1
movwf X andlw 0x33 addwf X, f rrf X, f addwf X, f rrf X, f
; --CD--GH ; ; ; ; ; 0AB00EF0 00CD00GH 0AB00EF0 0CD00GH0 0ABCD.0EFGH
swapf X, w addwf X, w andlw 0x0F
; Bit Count in w
APPENDIX G
GENERATING PARITY FOR A BYTE
The six instructions below (provided by John Payson) will calculate the even parity for a byte. At the end of the routine, bit 0 of X will have the even parity bit of the original number. Even parity means that if all the 1s in the byte are summed along with the parity bit, an even number will be produced.
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