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;*******************************************************************************
;* Function:  max6951_init
;*
;* Sets the correct SPI modes for talking to the MAX6951, enables SPI, and
;*
;* initializes the MAX6951 to display 8 0s.
;*
;* Input:     None.
;*
;* Output:    None.
;*
;* Destroys:  ACC, A[0] -- A[10], PSF
;*
;*******************************************************************************
MAX6951_INIT:
    ; SET SPI BAUD RATE
    MOVE    A[0], #2400H   ; SYSTEM CLOCK IS 16,000,000 HZ
    MOVE    A[1], #00F4H
    MOVE    A[2], #4240H   ; DESIRED BAUD RATE IS 1,000,000 HZ
    MOVE    A[3], #000FH
    CALL    SPI_SETBAUDRATE

    ; SET THE APPROPRIATE MODES FOR THE 6951
    MOVE    C, #SPI_IDLE_LOW  ; IDLE = LOW
    CALL    SPI_SETCLOCKPOLARITY
    MOVE    C, #SPI_ACTIVE_EDGE  ; ACTIVE = RISING EDGE
    CALL    SPI_SETCLOCKPHASE
    MOVE    C, #SPI_LENGTH_16  ; ALWAYS TRANSFER 16 BITS
    CALL    SPI_SETCHARACTERLENGTH
    MOVE    C, #SPI_MASTER_MODE ; MAXQ2000 IS THE MASTER, MAX6951 IS THE SLAVE
    CALL    SPI_SETMODE

    ; ENABLE SPI
    MOVE    C, #1
    CALL    SPI_ENABLE

    ; SHUTDOWN MAX6951 DISPLAY FIRST
    CALL    MAX6951_SHUTDOWN

    ; SET MAX6951 IN HEXADECIMAL DECODE MODE
    MOVE    ACC, #MAX6951REG_DECODE
    SLA4
    SLA4
    OR      #0FFH    ; HEXADECIMAL DECODE
    CALL    MAX6951_TRANSMIT

    ; SET DISPLAY INTENSITY = 16/16
    MOVE    ACC, #MAX6951REG_INTENSITY
    SLA4
    SLA4
    OR      #0FH    ; INTENSITY = 16/16
    CALL    MAX6951_TRANSMIT

    ; SCAN LIMIT = 7
    MOVE    ACC, #MAX6951REG_SCANLIMIT
    SLA4
    SLA4
    OR      #07H    ; SCAN LIMIT = 7