;********************************************************************************
; @module SPI
; @type driver
; @details
; @depends IO-W65C22N
;********************************************************************************

.include "system/system.h65"

.ifndef INCLUDE_SPI
INCLUDE_SPI = 1
    .segment "CODE"


    .struct SPI_P_Pins
        ; VIA addresses
        DDR_a   .word   ; address of the data direction register
        R_a     .word   ; address of the register
        ; pin mask
        SCLK_p  .byte   ; Serial Clock
        POCI_p  .byte   ; Peripheral Out / Controller In
        PICO_p  .byte   ; Peripheral In / Controller Out
        CSB_p   .byte   ; Chip Select
        ; settings
        CPOL    .byte   ; Clock Polarity
        CPHA    .byte   ; Clock Phase
    .endstruct

;********************************************************************************
; @function Initialize the IO Adapter for SPI
; @param ARG0-1 Address of the SPI_Pins struct
;********************************************************************************
.proc spi_p_init
    ; todo USE MASKS
    ; set Shift register to shift in under external clock on CB1
    lda #%00001100
    sta SPI_IO + IO_ACR

    ; enable SR interrupts
    lda #%10000100
    sta SPI_IO + IO_IER
    rts
.endproc

.proc spi_p_read
    ; print received byte
    lda SPI_IO + IO_SR
    jsr _lcd_char
    rts
.endproc

    
;********************************************************************************
; @function Read bytes
; @param X Number of bytes to send
; @param ARG0-1 Address of the SPI_Pins struct
; @param ARG2-3 Address of the first byte
;********************************************************************************
.proc recv_data
.endproc
;********************************************************************************
; @function Send bytes
; @param X Number of bytes to send
; @param ARG0-1 Address of the SPI_Pins struct
; @param ARG2-3 Address of the first byte
;********************************************************************************
.proc send_data
.endproc

    

_send_byte:
    
.endif