spi.inc

使用pic16f873晶片來設定adi的RGB轉HDMI的功能chip。最主要是裡面一些參數值的設定必須參考原廠的adi chip規格

;******************************************************************************

SPI_DATA_SEND
        BCF     RA,MC
        BCF     RA,MD

        MOVLW   08H             ;00001000
        MOVWF   CYCLE           ;8 data bits
        MOVLW   0FH
        MOVWF   COUNTER
        BCF     RA,ML         

SPI_DATA_S0
        BSF     RA,MD
        RLF     TEMP4
        BTFSS   STATUS,CF
        GOTO    SPI_DATA_S1
        BSF     RA,MD
SPI_DATA_S1
        BCF     RA,MC
        NOP
        BCF     RA,MC
        DECF    COUNTER
        DECFSZ  CYCLE
        GOTO    SPI_DATA_S0
        INCF    COUNTER
SPI_DATA_S2
        BAF     RA,MD
        RLF     TEMP3
        BTFSS   STATUS,CF
        GOTO    SPI_DATA_S3
        BSF     RA,MD
SPI_DATA_S3
        BCF     RA,MC
        NOP
        BCF     RA,MC
        DECFSZ  COUNTER
        GOTO    SPI_DATA_S2
        NOP
        BSF     RA,ML  
        NOP      
        BCF     RA,MD
   
        RETLW   0