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asmdraw.S
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asmdraw.S
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.arch armv4t
.section .iwram, "ax", %progbits
.align 4
@ r0 - addr
@ r1 - col
.global plot_pixel
plot_pixel:
tst r0, #1
bic r0, #1
ldrh r2, [r0] @ prev value
bne .odd
@even
bic r2, #0xFF
orr r2, r1
b .done
.odd:
bic r2, #0xFF00
orr r2, r1, LSL #8
.done:
strh r2, [r0]
bx lr
@ takes 20k cycles
@ r0 - vid addr start
.global fast_clear
fast_clear:
push {r4-r12}
push {r14}
mov r1, #0
mov r2, #0
mov r3, #0
mov r4, #0
mov r5, #0
mov r6, #0
mov r7, #0
mov r8, #0
mov r9, #0
mov r10, #0
mov r11, #0
mov r12, #0
mov r14, #0x14
1:
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
stmia r0!, {r1-r12}
subs r14, #1
bne 1b
pop {r14}
pop {r4-r12}
bx lr