diff options
Diffstat (limited to 'contrib/loaders/flash/str9x.s')
| -rw-r--r-- | contrib/loaders/flash/str9x.s | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/contrib/loaders/flash/str9x.s b/contrib/loaders/flash/str9x.s new file mode 100644 index 00000000..9b15b3de --- /dev/null +++ b/contrib/loaders/flash/str9x.s @@ -0,0 +1,54 @@ +/*************************************************************************** + * 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., * + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * + ***************************************************************************/ + + .text + .arm + .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 |