FreeCalypso > hg > freecalypso-tools
comparison target-utils/libbase/waitarm.S @ 453:6228d27738d1
target-utils: wait_ARM_cycles() added to libbase
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sat, 09 Feb 2019 07:35:07 +0000 |
| parents | |
| children | 06ad5e30e8d0 |
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| 452:688380565e0f | 453:6228d27738d1 |
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| 1 /* | |
| 2 * This assembly module provides a wait_ARM_cycles() function just like | |
| 3 * in TI's firmware; it is meant to gradually replace and phase out | |
| 4 * osmo_delay_ms(). One loop count for this function equals 5 ARM clock | |
| 5 * cycles when running out of IRAM. | |
| 6 */ | |
| 7 | |
| 8 .text | |
| 9 .code 32 | |
| 10 .globl wait_ARM_cycles | |
| 11 wait_ARM_cycles: | |
| 12 cmp r0, #0 | |
| 13 bxeq lr | |
| 14 1: sub r0, r0, #1 | |
| 15 cmp r0, #0 | |
| 16 bne 1b | |
| 17 bx lr |