ROMBUSDriver/spi_tx8.s
Zane Kaminski ef6286d674 idk
2022-12-18 08:46:39 -05:00

51 lines
1.6 KiB
ArmAsm

* spi calling convention
* A0 - ROM register
* A1 - readback address
* A2 - RX buffer
* A3 - TX buffer
* A4 - clobbered
* D0 - length (clobbered)
* D1 - nops (clobbered)
.global _spi_hal_tx8
.include "spi_hal_common.s"
.macro _spi_hal_tx8_iteration nops
move.b (%A3)+, %D1
move.b (%A0, %D1.W), %D1
.rept \nops
nop
.endr
.endm
.align 16
_spi_hal_tx8:
spi_call _spi_hal_tx8_lookup, 7
.align 16
_spi_hal_tx8_lookup:
lookup_table _spi_hal_tx8_lookup, _spi_hal_tx8_table_0, 6, 256
lookup_table _spi_hal_tx8_lookup, _spi_hal_tx8_table_1, 8, 256
lookup_table _spi_hal_tx8_lookup, _spi_hal_tx8_table_2, 10, 256
lookup_table _spi_hal_tx8_lookup, _spi_hal_tx8_table_3, 12, 256
lookup_table _spi_hal_tx8_lookup, _spi_hal_tx8_table_4, 14, 256
lookup_table _spi_hal_tx8_lookup, _spi_hal_tx8_table_5, 16, 256
lookup_table _spi_hal_tx8_lookup, _spi_hal_tx8_table_6, 18, 256
lookup_table _spi_hal_tx8_lookup, _spi_hal_tx8_table_7, 20, 256
.align 16
_spi_hal_tx8_table_0: unroll_table _spi_hal_tx8_iteration, 0, 256
.align 16
_spi_hal_tx8_table_1: unroll_table _spi_hal_tx8_iteration, 1, 256
.align 16
_spi_hal_tx8_table_2: unroll_table _spi_hal_tx8_iteration, 2, 256
.align 16
_spi_hal_tx8_table_3: unroll_table _spi_hal_tx8_iteration, 3, 256
.align 16
_spi_hal_tx8_table_4: unroll_table _spi_hal_tx8_iteration, 4, 256
.align 16
_spi_hal_tx8_table_5: unroll_table _spi_hal_tx8_iteration, 5, 256
.align 16
_spi_hal_tx8_table_6: unroll_table _spi_hal_tx8_iteration, 6, 256
.align 16
_spi_hal_tx8_table_7: unroll_table _spi_hal_tx8_iteration, 7, 256