FreeCalypso > hg > freecalypso-sw
comparison target-utils/libcommon/osmodelay.S @ 76:07b686248ab7
pirexplore: finally got the backlight to turn on
| author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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| date | Thu, 01 Aug 2013 00:26:29 +0000 |
| parents | |
| children |
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| 75:c9768f5fb329 | 76:07b686248ab7 |
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| 1 /* | |
| 2 * This assembly module provides a replica of OsmocomBB's bogo-millisecond | |
| 3 * delay_ms() function. It is literally a copy of what OsmocomBB's delay_ms() | |
| 4 * compiles to with their gcc version and their optimization settings, as seen | |
| 5 * by doing arm-elf-objdump on their lib/delay.o. | |
| 6 * | |
| 7 * This hack is intended for those cases where we have to copy OsmocomBB's | |
| 8 * black magic voodoo operations with no ability to understand what is actually | |
| 9 * needed, such as SPCA552E initialization on the Pirelli DP-L10. | |
| 10 */ | |
| 11 | |
| 12 .text | |
| 13 .code 32 | |
| 14 .globl osmo_delay_ms | |
| 15 osmo_delay_ms: | |
| 16 mov r3, #0 | |
| 17 sub sp, sp, #4 | |
| 18 str r3, [sp] | |
| 19 ldr r3, =1300 | |
| 20 mul r3, r0, r3 | |
| 21 b 2f | |
| 22 1: ldr r2, [sp] | |
| 23 ldr r2, [sp] | |
| 24 add r2, r2, #1 | |
| 25 str r2, [sp] | |
| 26 2: ldr r2, [sp] | |
| 27 cmp r2, r3 | |
| 28 bcc 1b | |
| 29 add sp, sp, #4 | |
| 30 bx lr |