58 lines
1.9 KiB
Plaintext
58 lines
1.9 KiB
Plaintext
;;********************************************************************************
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;; @file
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;; @brief SPI Perpiheral
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;; @details
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;; Support being a peripheral SPI device.
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;; @depends IO-W65C22N
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;;********************************************************************************
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.ifndef INCLUDE_SPI
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INCLUDE_SPI = 1
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.include "system/system.h65"
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;;********************************************************************************
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;; @brief Support being a peripheral SPI device
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;; @details
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;; This requires the data line to be hooked up to `CB2` and the clock to `CB1`.
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;; The VIA will be set to shift in the data into the shift register under the external clock.
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;; @ingroup drivers
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;; @see via_hardware_bug "VIA external clock bug"
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;;********************************************************************************
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.scope spi_p
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;; Address of the VIA that is used for the spi connection
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SPI_IO = IO2
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Import spi_p, init, irq_handler, status, buffer_size, recv_size
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ImportZp spi_p, buffer_ptr
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Import spi_p, begin_read, end_read, irq_read_byte, recv_bytes
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Import spi_p, begin_write, end_write, irq_write_byte, sent_bytes
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;;********************************************************************************
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;; @brief Status of a SPI transfer
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;;********************************************************************************
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.enum STATUS
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XFER_SIZEL = %10000000
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XFER_SIZEH = %01000000
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XFER = %00000001
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DONE = %00000000
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ERROR = %00100000
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.endenum
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.endscope
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.endif ; guard
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; .struct SPI_P_Pins
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; ; VIA addresses
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; DDR_a .word ; address of the data direction register
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; R_a .word ; address of the register
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; ; pin mask
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; SCLK_p .byte ; Serial Clock
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; POCI_p .byte ; Peripheral Out / Controller In
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; PICO_p .byte ; Peripheral In / Controller Out
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; CSB_p .byte ; Chip Select
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; ; settings
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; CPOL .byte ; Clock Polarity
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; CPHA .byte ; Clock Phase
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; .endstruct
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