* 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. *
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
.text
.syntax unified
- .cpu cortex-m3
+ .cpu cortex-m0
.thumb
.thumb_func
.global write
* Clobbered:
* r5 - rp
* r6 - wp, tmp
+ * r7 - tmp
*/
-#define STM32_FLASH_CR_OFFSET 0x10 /* offset of CR register from flash reg base */
#define STM32_FLASH_SR_OFFSET 0x0c /* offset of SR register from flash reg base */
wait_fifo:
ldr r5, [r2, #4] /* read rp */
cmp r5, r6 /* wait until rp != wp */
beq wait_fifo
- movs r6, #1 /* set PG flag to enable flash programming */
- str r6, [r0, #STM32_FLASH_CR_OFFSET]
- ldrh r6, [r5], #2 /* "*target_address++ = *rp++" */
- strh r6, [r4], #2
+ ldrh r6, [r5] /* "*target_address++ = *rp++" */
+ strh r6, [r4]
+ adds r5, #2
+ adds r4, #2
busy:
ldr r6, [r0, #STM32_FLASH_SR_OFFSET] /* wait until BSY flag is reset */
- tst r6, #1
+ movs r7, #1
+ tst r6, r7
bne busy
- tst r6, #0x14 /* check the error bits */
+ movs r7, #0x14 /* check the error bits */
+ tst r6, r7
bne error
cmp r5, r3 /* wrap rp at end of buffer */
- it cs
- addcs r5, r2, #8
+ bcc no_wrap
+ mov r5, r2
+ adds r5, #8
+no_wrap:
str r5, [r2, #4] /* store rp */
subs r1, r1, #1 /* decrement halfword count */
- cbz r1, exit /* loop if not done */
- b wait_fifo
+ cmp r1, #0
+ beq exit /* loop if not done */
+ b wait_fifo
error:
movs r0, #0
- str r0, [r2, #2] /* set rp = 0 on error */
+ str r0, [r2, #4] /* set rp = 0 on error */
exit:
mov r0, r6 /* return status in r0 */
bkpt #0