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- /***************************************************************************
- * Copyright (C) 2010 by Spencer Oliver *
- * spen@spen-soft.co.uk *
- * *
- * This program is free software; you can redistribute it and/or modify *
- * it under the terms of the GNU General Public License as published by *
- * the Free Software Foundation; either version 2 of the License, or *
- * (at your option) any later version. *
- * *
- * This program is distributed in the hope that it will be useful, *
- * but WITHOUT ANY WARRANTY; without even the implied warranty of *
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
- * GNU General Public License for more details. *
- * *
- * You should have received a copy of the GNU General Public License *
- * along with this program; if not, write to the *
- * Free Software Foundation, Inc., *
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
- ***************************************************************************/
-
- .text
- .arm
- .arch armv5t
-
- .section .init
- /*
- r0 source address (in)
- r1 target address (in)
- r2 word count (in)
- r3 result (out)
- */
-
- write:
- bic r4, r1, #3 /* word address */
- mov r3, #0x40 /* write command */
- strh r3, [r4, #0]
- ldrh r3, [r0], #2 /* read data */
- strh r3, [r1], #2 /* write data */
- mov r3, #0x70 /* status command */
- strh r3, [r4, #0]
- busy:
- ldrb r3, [r4, #0] /* status */
- tst r3, #0x80
- beq busy
- mov r5, #0x50 /* clear status command */
- strh r5, [r4, #0]
- mov r5, #0xFF /* read array */
- strh r5, [r4, #0]
- tst r3, #0x12
- bne exit
- subs r2, r2, #1 /* decremment word count */
- bne write
- exit:
- bkpt #0
-
- .end
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