835.asm

conexant视频解码器bt835的配置

MTD     EQU     30H     ;主发送缓冲区首地址
                NUMBYT  EQU     20H     ;发送48个数据(包括起始寄存器地址00H)
                SLA     EQU     70H     ;寻址字节存放于此单元
                ORG     0000H           ;主程序入口
                LJMP    MAIN
                ORG     0060H           ;中断散转程序首址
MAIN:           MOV     NUMBYT,#2BH
                MOV     SLA,#8AH        ;BT835的地址送入80H单元中
                LCALL   LOAD_ADDRESS    ;发送数据装载到发送缓冲区中
                LCALL   WRNBYT
                RET
LOAD_ADDRESS:   MOV     A,SLA
                MOV     R0,#MTD         ;发送数据装载到发送缓冲区中
                MOV     @R0,#00H        ;BT835的寄存器0的地址      00
                INC     R0
                MOV     @R0,#0F8H
                INC     R0
                MOV     @R0,#04H        ;subaddress01
                INC     R0
                MOV     @R0,#16H        ;subaddress02
                INC     R0
                MOV     @R0,#00H        ;subaddress03
                INC     R0
                MOV     @R0,#0e0H        ;subaddress04
                INC     R0
                MOV     @R0,#01H        ;subaddress05
                INC     R0
                MOV     @R0,#78H        ;subaddress06
                INC     R0
                MOV     @R0,#00H        ;subaddress07
                INC     R0
                MOV     @R0,#80H        ;subaddress08     HACTIVE
                INC     R0
                MOV     @R0,#02H        ;subaddress09     HACTIVE
                INC     R0
                MOV     @R0,#03CH       ;subaddress0a     3c     HSCALE
                INC     R0
                MOV     @R0,#03H        ;subaddress0b     03     HSCALE
                INC     R0
                MOV     @R0,#00H        ;subaddress0c
                INC     R0
                MOV     @R0,#00H        ;subaddress0d
                INC     R0
                MOV     @R0,#10H        ;subaddress0e      00
                INC     R0
                MOV     @R0,#00H        ;subaddress0f
                INC     R0
                MOV     @R0,#00H        ;subaddress10
                INC     R0
                MOV     @R0,#39H        ;subaddress11
                INC     R0
                MOV     @R0,#7FH        ;subaddress12
                INC     R0
                MOV     @R0,#5AH        ;subaddress13
                INC     R0
                MOV     @R0,#00H        ;subaddress14
                INC     R0
                MOV     @R0,#40H       ;subaddress15            defalt 00  my choise e4??
                INC     R0
                MOV     @R0,#1CH        ;subaddress16
                INC     R0
                MOV     @R0,#01H        ;subaddress17
                INC     R0
                MOV     @R0,#44H        ;subaddress18
                INC     R0
                MOV     @R0,#00H        ;subaddress19
                INC     R0
                MOV     @R0,#7FH        ;subaddress1a
                INC     R0
                MOV     @R0,#72H        ;subaddress1b
                INC     R0
                MOV     @R0,#01H        ;subaddress1c
                INC     R0
                MOV     @R0,#0C7H       ;subaddress1d
                INC     R0
                MOV     @R0,#7FH        ;subaddress1e
                INC     R0
                MOV     @R0,#80H        ;subaddress1f
                INC     R0
                MOV     @R0,#0B8H       ;subaddress20
                INC     R0
                MOV     @R0,#00H        ;subaddress21
                INC     R0
                MOV     @R0,#0FFH       ;subaddress22
                INC     R0
                MOV     @R0,#00H        ;subaddress23
                INC     R0
                MOV     @R0,#01H        ;subaddress24       00
                INC     R0
                MOV     @R0,#00H        ;subaddress25
                INC     R0
                MOV     @R0,#00H        ;subaddress26
                INC     R0
                MOV     @R0,#0CH        ;subaddress27
                INC     R0
                MOV     @R0,#0f9H       ;subaddress28        pll_f  f9
                INC     R0
                MOV     @R0,#0dcH       ;subaddress29        pll_f dc
                INC     R0
                MOV     @R0,#0eH       ;subaddress2a       0e
                INC     R0
                MOV     @R0,#00H        ;subaddress2b
                INC     R0
                MOV     @R0,#00H        ;subaddress2c
                INC     R0
                MOV     @R0,#00H        ;subaddress2d
                INC     R0
                MOV     @R0,#00H        ;subaddress2e
                RET
STA:            SETB    P1.6
                SETB    P1.7
                NOP
                NOP
                NOP
                NOP
                CLR     P1.6
                NOP
                NOP
                NOP
                NOP
                CLR     P1.7
                RET
STOP:           CLR     P1.6
                SETB    P1.7
                NOP
                NOP
                NOP
                NOP
                SETB    P1.6
                NOP
                NOP
                NOP
                NOP
                CLR     P1.7
                RET
MACK:           CLR     P1.6
                SETB    P1.7
                NOP
                NOP
                NOP
                NOP
                CLR     P1.7
                SETB    P1.6
                RET
MNACK:          SETB    P1.6
                SETB    P1.7
                NOP
                NOP
                NOP
                NOP
                CLR     P1.7
                CLR     P1.6
                RET
CACK:           SETB    P1.6
                SETB    P1.7
                CLR     F0
                MOV     A,P1
                JNB     ACC.6,CEND      ;ACC.6为0，则表示SDA被拉低响应，转CEND
                SETB    F0
CEND:           CLR     P1.7
                NOP
                NOP
                RET
WRBYT:          MOV     R0,#08H
WLP:            RLC     A
                JC      WR1
                AJMP    WR0
WLP1:           DJNZ    R0,WLP
                RET
WR1:            SETB    P1.6
                SETB    P1.7
                NOP
                NOP
                NOP
                NOP
                CLR     P1.7
                CLR     P1.6
                AJMP    WLP1
WR0:            CLR     P1.6
                SETB    P1.7
                NOP
                NOP
                NOP
                NOP
                CLR     P1.7
                AJMP    WLP1
WRNBYT:         LCALL   STA
                MOV     A,SLA
                LCALL   WRBYT
                LCALL   CACK
                JB      F0,WRNBYT       ;没有收到ACK，跳WRNBYT再重传88H
                MOV     R1,#MTD         ;片地址88H有ACK响应，则开始准备发送数据
WRDA:           MOV     A,@R1
                LCALL   WRBYT
                LCALL   CACK
                JB      F0,WRNBYT
                INC     R1
                DJNZ    NUMBYT,WRDA
                LCALL   STOP
                RET