FreeCalypso > hg > freecalypso-tools
changeset 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 | 688380565e0f |
| children | daaab2701761 |
| files | target-utils/libbase/Makefile target-utils/libbase/waitarm.S |
| diffstat | 2 files changed, 18 insertions(+), 1 deletions(-) [+] |
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--- a/target-utils/libbase/Makefile Fri Feb 08 02:14:53 2019 +0000 +++ b/target-utils/libbase/Makefile Sat Feb 09 07:35:07 2019 +0000 @@ -4,7 +4,7 @@ AR= arm-elf-ar RANLIB= arm-elf-ranlib -OBJS= abbdrv.o osmodelay.o serio.o spidrv.o +OBJS= abbdrv.o osmodelay.o serio.o spidrv.o waitarm.o all: libbase.a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/target-utils/libbase/waitarm.S Sat Feb 09 07:35:07 2019 +0000 @@ -0,0 +1,17 @@ +/* + * This assembly module provides a wait_ARM_cycles() function just like + * in TI's firmware; it is meant to gradually replace and phase out + * osmo_delay_ms(). One loop count for this function equals 5 ARM clock + * cycles when running out of IRAM. + */ + + .text + .code 32 + .globl wait_ARM_cycles +wait_ARM_cycles: + cmp r0, #0 + bxeq lr +1: sub r0, r0, #1 + cmp r0, #0 + bne 1b + bx lr