/
countshort.s
131 lines (107 loc) · 2.23 KB
/
countshort.s
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/******************************************************************************
* count.s
* by Roland Koluvek
*
* A function that will toggle n times at t1 time and exit 1.
* r0 is n and r1 is pin gpio pin.
******************************************************************************/
.global CountShort
CountShort:
push {r2-r8,lr}
pulses .req r4
pin .req r5
mov pulses,r0
mov pin,r1
/*
* Use our new SetGpioFunction function to set the function of GPIO port 16 (OK
* LED) to 001 (binary)
*/
mov r0,pin
mov r1,#1
bl SetGpioFunction
loopx$:
subs pulses,#1
blt exit10$
bl onpulse
/* test for end */
b loopx$
exit10$:
pop {r2-r8,pc}
.unreq pulses
/* turn on */
turnon:
push {lr}
mov r0,pin
mov r1,#1
bl SetGpio
pop {pc}
/* turn off */
turnoff:
push {lr}
mov r0,pin
mov r1,#0
bl SetGpio
pop {pc}
/* on pulse */
onpulse:
push {lr}
bl turnon
bl turnoff
pop {pc}
/* off pulse */
offpulse:
push {lr}
bl turnoff
bl turnoff
pop {pc}
.unreq pin
/* show word part in r0 length in r1 */
.global showword
showword:
push {lr}
push {r0,r1}
mov r0,#1 @ synch pulse
mov r1,#0 @ gpio 0
bl CountShort
pop {r0,r1}
bl shownow
mov r0,#1 @ synch pulse
mov r1,#0 @ gpio 0
bl CountShort
pop {pc}
/* show without synch */
.globl shownow
shownow:
pin .req r5
byte .req r6
counter .req r7
push {r2-r9,lr}
push {r0,r1}
mov pin,#1
mov r0,pin
mov r1,#1
bl SetGpioFunction
pop {r0,r1}
mov byte,r0
mov counter,r1
mov r8,counter
sub r8,#1
mov r9,#1
lsl r9,r8
loopit$:
subs counter,#1
blt doneit$
mov pin,#1
tst byte,r9
bleq turnoff
blne turnon
lsl byte,#1
b loopit$
doneit$:
mov r0,#1 @ end pulse
mov r1,#0 @ gpio 0
bl CountShort
pop {r2-r9,pc}
.unreq counter
.unreq byte
.unreq pin