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