84 lines
2.4 KiB
ArmAsm
84 lines
2.4 KiB
ArmAsm
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 by Jens Arnold
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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.section .icode,"ax",@progbits
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.align 2
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.global lcd_write_command
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.type lcd_write_command,@function
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lcd_write_command:
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move.l (4, %sp), %d0
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move.w %d0, 0xf0008000
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rts
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.wc_end:
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.size lcd_write_command,.wc_end-lcd_write_command
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.align 2
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.global lcd_write_command_ex
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.type lcd_write_command_ex,@function
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lcd_write_command_ex:
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lea.l 0xf0008000, %a0
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move.l (4, %sp), %d0 /* Command */
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move.w %d0, (%a0)+ /* Write to LCD, set A0 = 1 */
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move.l (8, %sp), %d0 /* Data */
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cmp.l #-1, %d0 /* -1? */
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beq.b .last
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move.w %d0, (%a0) /* Write to LCD */
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move.l (12, %sp), %d0 /* Data */
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cmp.l #-1, %d0 /* -1? */
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beq.b .last
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move.w %d0, (%a0) /* Write to LCD */
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.last:
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rts
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.wcex_end:
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.size lcd_write_command_ex,.wcex_end-lcd_write_command_ex
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.align 2
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.global lcd_write_data
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.type lcd_write_data,@function
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lcd_write_data:
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move.l (4,%sp), %a0 /* Data pointer */
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move.l (8,%sp), %d0 /* Length */
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lea 0xf0008002, %a1
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.loop:
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/* When running in IRAM, this loop takes 7 cycles plus the LCD write.
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The 7 cycles are necessary to follow the LCD timing specs
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at 140MHz */
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move.b (%a0)+, %d1 /* 3(1/0) */
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move.w %d1, (%a1) /* 1(0/1) */
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subq.l #1, %d0 /* 1(0/0) */
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nop /* 1(0/0) */
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bne .loop /* 2(0/0) */
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rts
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.wd_end:
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.size lcd_write_data,.wd_end-lcd_write_data
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