len0rd/rockbox
1
0
Fork 1
mirror of https://github.com/Rockbox/rockbox.git synced 2025-12-08 12:45:26 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

Bugfix: On vertically packed 2bpp LCDs a grey pixel block is only 4 pixels, so don't process twice as much data as intended. This was the cause for the mpegplayer crashes.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22885 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2009-10-03 12:20:35 +00:00
parent e2c2642afa
commit 840fb66bc9
1 changed files with 18 additions and 37 deletions
Download patch file Download diff file Expand all files Collapse all files

55
firmware/target/arm/samsung/yh920/lcd-as-yh920.S
View file

@ -103,66 +103,47 @@ lcd_mono_data:
* r2 - pixel block count
*
* Register usage:
* r3/r4 - current block of phases
* r5/r6 - current block of values
* r7 - lcd data accumulator
* r8 - phase signs mask
* r3 - current block of phases
* r4 - current block of values
* r5 - lcd data accumulator
* r12 - phase signs mask
* lr - lcd bridge address
*/
lcd_grey_data:
stmfd sp!, {r4-r7, lr}
stmfd sp!, {r4-r5, lr}
mov r12, #0x80
orr r12, r12, r12, lsl #8
orr r12, r12, r12, lsl #16
ldr lr, =LCD1_BASE
.greyloop:
ldmia r1, {r3-r4} /* Fetch 8 pixel phases */
ldmia r0!, {r5-r6} /* Fetch 8 pixel values */
ldr r3, [r1] /* Fetch 4 pixel phases */
ldr r4, [r0], #4 /* Fetch 4 pixel values */
mov r7, #0
mov r5, #0
tst r3, #0x80
orreq r7, r7, #0xc0
orreq r5, r5, #0xc0
tst r3, #0x8000
orreq r7, r7, #0x30
orreq r5, r5, #0x30
tst r3, #0x800000
orreq r7, r7, #0x0c
orreq r5, r5, #0x0c
tst r3, #0x80000000
orreq r7, r7, #0x03
orreq r5, r5, #0x03
bic r3, r3, r12
add r3, r3, r5
add r3, r3, r4
str r3, [r1], #4
1:
ldr r5, [lr]
tst r5, #LCD1_BUSY_MASK
ldr r3, [lr]
tst r3, #LCD1_BUSY_MASK
bne 1b
str r7, [lr, #0x10]
mov r7, #0
tst r4, #0x80
orreq r7, r7, #0xc0
tst r4, #0x8000
orreq r7, r7, #0x30
tst r4, #0x800000
orreq r7, r7, #0x0c
tst r4, #0x80000000
orreq r7, r7, #0x03
bic r4, r4, r12
add r4, r4, r6
stmia r1!, {r3-r4}
1:
ldr r5, [lr]
tst r5, #LCD1_BUSY_MASK
bne 1b
str r7, [lr, #0x10]
str r5, [lr, #0x10]
subs r2, r2, #1
bne .greyloop
ldmfd sp!, {r4-r7, pc}
ldmfd sp!, {r4-r5, pc}
.size lcd_grey_data,.-lcd_grey_data