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| author | Linus Nielsen Feltzing <linus@haxx.se> | 2005-03-01 14:32:17 +0000 |
|---|---|---|
| committer | Linus Nielsen Feltzing <linus@haxx.se> | 2005-03-01 14:32:17 +0000 |
| commit | e734017e2f0f4b0d70242c9621359fa79b74318d (patch) | |
| tree | 988a144b18d56fb0bd573d2d707eebe727ec09c0 | |
| parent | 8444632da4710c72a6fbb5f6e002a76f97d537f1 (diff) | |
| download | rockbox-e734017e2f0f4b0d70242c9621359fa79b74318d.zip rockbox-e734017e2f0f4b0d70242c9621359fa79b74318d.tar.gz rockbox-e734017e2f0f4b0d70242c9621359fa79b74318d.tar.bz2 rockbox-e734017e2f0f4b0d70242c9621359fa79b74318d.tar.xz | |
iRiver: more relaxed LCD timing
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6091 a1c6a512-1295-4272-9138-f99709370657
| -rwxr-xr-x | firmware/drivers/lcd.S | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/firmware/drivers/lcd.S b/firmware/drivers/lcd.S index 585b9d1..ee3eedb 100755 --- a/firmware/drivers/lcd.S +++ b/firmware/drivers/lcd.S @@ -362,9 +362,13 @@ lcd_write_data: lea 0xf0000000,%a1 .loop: - move.b (%a0)+,%d1 - move.w %d1,(%a1) - subq.l #1,%d0 - bne .loop + /* When running in IRAM, this loop takes 7 cycles plus the LCD write. + The 7 cycles are necessary to follow the LCD timing specs + at 140MHz */ + move.b (%a0)+,%d1 /* 3(1/0) */ + move.w %d1,(%a1) /* 1(0/1) */ + subq.l #1,%d0 /* 1(0/0) */ + nop /* 1(0/0) */ + bne .loop /* 2(0/0) */ rts #endif |