diff options
Diffstat (limited to 'contrib/loaders')
| -rw-r--r-- | contrib/loaders/flash/armv7m_io.s | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/contrib/loaders/flash/armv7m_io.s b/contrib/loaders/flash/armv7m_io.s new file mode 100644 index 00000000..3bd90ca6 --- /dev/null +++ b/contrib/loaders/flash/armv7m_io.s @@ -0,0 +1,60 @@ +/*************************************************************************** + * Copyright (C) 2013 by Henrik Nilsson * + * henrik.nilsson@bytequest.se * + * * + * 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 + .syntax unified + .arch armv7-m + .thumb + .thumb_func + + .align 4 + +/* Inputs: + * r0 buffer address + * r1 NAND data address (byte wide) + * r2 buffer length + */ +read: + ldrb r3, [r1] + strb r3, [r0], #1 + subs r2, r2, #1 + bne read + +done_read: + bkpt #0 + + .align 4 + +/* Inputs: + * r0 NAND data address (byte wide) + * r1 buffer address + * r2 buffer length + */ +write: + ldrb r3, [r1], #1 + strb r3, [r0] + subs r2, r2, #1 + bne write + +done_write: + bkpt #0 + + .end + |