mirror of
https://github.com/NanjingForestryUniversity/valveboard.git
synced 2025-11-09 06:44:07 +00:00
a8e54608b3
add epc9600 example Co-Authored-By: Suhandong <80463329+Suhandong@users.noreply.github.com> Co-Authored-By: FGR-cmd <80112392+FGR-cmd@users.noreply.github.com>
19 lines
345 B
ArmAsm
19 lines
345 B
ArmAsm
.global delay_us
|
|
.func delay_us
|
|
delay_us:
|
|
cmp r0, #0
|
|
moveq pc, lr
|
|
stmfd sp!, {r1, r2, fp, lr}
|
|
mov r1, r0
|
|
big_loop:
|
|
ldr r2, =266
|
|
loop:
|
|
sub r2, r2, #1
|
|
cmp r2, #0
|
|
bne loop
|
|
sub r1, r1, #1
|
|
cmp r1, #0
|
|
bne big_loop
|
|
ldmfd sp!, {r1, r2, fp, pc}
|
|
.endfunc
|