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/*
wiring_pulse.s - pulseInASM() function in different flavours
Part of Arduino - http://www.arduino.cc/
Copyright (c) 2014 Martino Facchin
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330,
Boston, MA 02111-1307 USA
*/
/*
* The following routine was generated by avr-gcc 4.8.3 with the following parameters
* -gstabs -Wa,-ahlmsd=output.lst -dp -fverbose-asm -O2
* on the original C function
*
* unsigned long pulseInSimpl(volatile uint8_t *port, uint8_t bit, uint8_t stateMask, unsigned long maxloops)
* {
* unsigned long width = 0;
* // wait for any previous pulse to end
* while ((*port & bit) == stateMask)
* if (--maxloops == 0)
* return 0;
*
* // wait for the pulse to start
* while ((*port & bit) != stateMask)
* if (--maxloops == 0)
* return 0;
*
* // wait for the pulse to stop
* while ((*port & bit) == stateMask) {
* if (++width == maxloops)
* return 0;
* }
* return width;
* }
*
* some compiler outputs were removed but the rest of the code is untouched
*/
#include <avr/io.h>
.section .text
.global countPulseASM
countPulseASM:
.LM0:
.LFBB1:
push r12 ; ; 130 pushqi1/1 [length = 1]
push r13 ; ; 131 pushqi1/1 [length = 1]
push r14 ; ; 132 pushqi1/1 [length = 1]
push r15 ; ; 133 pushqi1/1 [length = 1]
push r16 ; ; 134 pushqi1/1 [length = 1]
push r17 ; ; 135 pushqi1/1 [length = 1]
/* prologue: function */
/* frame size = 0 */
/* stack size = 6 */
.L__stack_usage = 6
mov r30,r24 ; port, port ; 2 *movhi/1 [length = 2]
mov r31,r25 ; port, port
/* unsigned long width = 0;
*** // wait for any previous pulse to end
*** while ((*port & bit) == stateMask)
*/
.LM1:
rjmp .L2 ; ; 181 jump [length = 1]
.L4:
/* if (--maxloops == 0) */
.LM2:
subi r16,1 ; maxloops, ; 17 addsi3/2 [length = 4]
sbc r17, r1 ; maxloops
sbc r18, r1 ; maxloops
sbc r19, r1 ; maxloops
breq .L13 ; , ; 19 branch [length = 1]
.L2:
/* if (--maxloops == 0) */
.LM3:
ld r25,Z ; D.1554, *port_7(D) ; 22 movqi_insn/4 [length = 1]
and r25,r22 ; D.1554, bit ; 24 andqi3/1 [length = 1]
cp r25,r20 ; D.1554, stateMask ; 25 *cmpqi/2 [length = 1]
breq .L4 ; , ; 26 branch [length = 1]
rjmp .L6 ; ; 184 jump [length = 1]
.L7:
/* return 0;
***
*** // wait for the pulse to start
*** while ((*port & bit) != stateMask)
*** if (--maxloops == 0)
*/
.LM4:
subi r16,1 ; maxloops, ; 31 addsi3/2 [length = 4]
sbc r17, r1 ; maxloops
sbc r18, r1 ; maxloops
sbc r19, r1 ; maxloops
breq .L13 ; , ; 33 branch [length = 1]
.L6:
/* if (--maxloops == 0) */
.LM5:
ld r25,Z ; D.1554, *port_7(D) ; 41 movqi_insn/4 [length = 1]
and r25,r22 ; D.1554, bit ; 43 andqi3/1 [length = 1]
cpse r25,r20 ; D.1554, stateMask ; 44 enable_interrupt-3 [length = 1]
rjmp .L7 ;
mov r12, r1 ; width ; 7 *movsi/2 [length = 4]
mov r13, r1 ; width
mov r14, r1 ; width
mov r15, r1 ; width
rjmp .L9 ; ; 186 jump [length = 1]
.L10:
/* return 0;
***
*** // wait for the pulse to stop
*** while ((*port & bit) == stateMask) {
*** if (++width == maxloops)
*/
.LM6:
ldi r24,-1 ; , ; 50 addsi3/3 [length = 5]
sub r12,r24 ; width,
sbc r13,r24 ; width,
sbc r14,r24 ; width,
sbc r15,r24 ; width,
cp r16,r12 ; maxloops, width ; 51 *cmpsi/2 [length = 4]
cpc r17,r13 ; maxloops, width
cpc r18,r14 ; maxloops, width
cpc r19,r15 ; maxloops, width
breq .L13 ; , ; 52 branch [length = 1]
.L9:
/* if (++width == maxloops) */
.LM7:
ld r24,Z ; D.1554, *port_7(D) ; 60 movqi_insn/4 [length = 1]
and r24,r22 ; D.1554, bit ; 62 andqi3/1 [length = 1]
cp r24,r20 ; D.1554, stateMask ; 63 *cmpqi/2 [length = 1]
breq .L10 ; , ; 64 branch [length = 1]
/* return 0;
*** }
*** return width;
*/
.LM8:
mov r22,r12 ; D.1553, width ; 108 movqi_insn/1 [length = 1]
mov r23,r13 ; D.1553, width ; 109 movqi_insn/1 [length = 1]
mov r24,r14 ; D.1553, width ; 110 movqi_insn/1 [length = 1]
mov r25,r15 ; D.1553, width ; 111 movqi_insn/1 [length = 1]
/* epilogue start */
.LM9:
pop r17 ; ; 171 popqi [length = 1]
pop r16 ; ; 172 popqi [length = 1]
pop r15 ; ; 173 popqi [length = 1]
pop r14 ; ; 174 popqi [length = 1]
pop r13 ; ; 175 popqi [length = 1]
pop r12 ; ; 176 popqi [length = 1]
ret ; 177 return_from_epilogue [length = 1]
.L13:
.LM10:
ldi r22,0 ; D.1553 ; 120 movqi_insn/1 [length = 1]
ldi r23,0 ; D.1553 ; 121 movqi_insn/1 [length = 1]
ldi r24,0 ; D.1553 ; 122 movqi_insn/1 [length = 1]
ldi r25,0 ; D.1553 ; 123 movqi_insn/1 [length = 1]
/* epilogue start */
.LM11:
pop r17 ; ; 138 popqi [length = 1]
pop r16 ; ; 139 popqi [length = 1]
pop r15 ; ; 140 popqi [length = 1]
pop r14 ; ; 141 popqi [length = 1]
pop r13 ; ; 142 popqi [length = 1]
pop r12 ; ; 143 popqi [length = 1]
ret ; 144 return_from_epilogue [length = 1]
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