FreeCalypso > hg > freecalypso-tools
annotate target-utils/libbase/osmodelay.S @ 529:30bec872824a
doc/Target-utils: flash-boot-test documented
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 16 Jun 2019 18:42:44 +0000 |
parents | e7502631a0f9 |
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1 /* |
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2 * This assembly module provides a replica of OsmocomBB's bogo-millisecond |
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3 * delay_ms() function. It is literally a copy of what OsmocomBB's delay_ms() |
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4 * compiles to with their gcc version and their optimization settings, as seen |
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5 * by doing arm-elf-objdump on their lib/delay.o. |
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Mychaela Falconia <falcon@freecalypso.org>
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6 * |
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Mychaela Falconia <falcon@freecalypso.org>
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7 * This hack is intended for those cases where we have to copy OsmocomBB's |
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8 * black magic voodoo operations with no ability to understand what is actually |
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9 * needed, such as SPCA552E initialization on the Pirelli DP-L10. |
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Mychaela Falconia <falcon@freecalypso.org>
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10 */ |
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Mychaela Falconia <falcon@freecalypso.org>
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11 |
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12 .text |
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13 .code 32 |
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14 .globl osmo_delay_ms |
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15 osmo_delay_ms: |
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16 mov r3, #0 |
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17 sub sp, sp, #4 |
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18 str r3, [sp] |
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19 ldr r3, =1300 |
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20 mul r3, r0, r3 |
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21 b 2f |
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22 1: ldr r2, [sp] |
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23 ldr r2, [sp] |
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24 add r2, r2, #1 |
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25 str r2, [sp] |
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26 2: ldr r2, [sp] |
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27 cmp r2, r3 |
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28 bcc 1b |
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29 add sp, sp, #4 |
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30 bx lr |