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          EEPW首頁(yè) > 嵌入式系統(tǒng) > 設(shè)計(jì)應(yīng)用 > PIC16C74B單片機(jī)與AT24C64通訊

          PIC16C74B單片機(jī)與AT24C64通訊

          作者: 時(shí)間:2011-02-24 來(lái)源:網(wǎng)絡(luò) 收藏
          ;=======================================
          ;PIC16C74B與AT24C64通訊
          ;該程序?qū)崿F(xiàn)的功能是:
          ;將I2C_A,I2C_B.....I2C_K內(nèi)容寫(xiě)入EEPROM中
          ;同時(shí)在EEPROM中讀出數(shù)據(jù)從新寫(xiě)入各個(gè)寄存器
          ;=======================================
          LISTP=16C74B
          #includep16c74.inc>
          ERRORLEVEL-302
          I2C_AEQU0X20
          I2C_BEQU0X21
          I2C_CEQU0X22
          I2C_DEQU0X23
          I2C_EEQU0X24
          I2C_FEQU0X25
          I2C_GEQU0X26
          REG1EQU0X2B
          REG2EQU0X2C
          COUNTEQU0X71;I2C
          BCOUNTEQU0X72;I2C
          TXBUFEQU0X73;I2C
          RXBUFEQU0X74;I2C
          BUSCONEQU0X75;I2C
          BUSSTAEQU0X76;I2C
          I2CBUFEQU0X77;I2C
          SLAVEADDREQU0XA0;I2C
          DATAADDRHEQU0X01;I2C
          DATAADDRLEQU0X00;I2C
          ;---------------------------------------
          ;BUSCON
          ;---------------------------------------
          SLAVE_RWEQU7
          LAST_BYTE_RXEQU6
          SLAVE_ACTIVEEQU5
          TIME_OUTEQU4
          ;---------------------------------------
          ;BUSSTA
          ;---------------------------------------
          BUS_BUSYEQU7
          TX_PROGRESSEQU6
          RX_PROGRESSEQU5
          TX_SUCCESSEQU4
          RX_SUCCESSEQU3
          FATAL_ERROREQU2;SLAVEEEPROM
          ABORTEQU1
          ACK_ERROREQU0
          ;---------------------------------------
          R_NOT_WEQU0
          TRUEEQU1
          FALSEEQU0
          SDAEQU0X04;I2C
          SCLEQU0X03;I2C
          ;=======================================
          ORG0X00
          GOTOSTART
          ORG0X20
          STARTBCFSTATUS,RP1
          BCFSTATUS,RP0
          CLRFRA
          CLRFRB
          CLRFRC
          CLRFRD
          CLRFRE
          BSFSTATUS,RP0
          CLRFTRISA
          CLRFTRISB
          CLRFTRISC
          CLRFTRISD
          CLRFTRISE
          MOVLW0X02
          MOVWFI2C_A
          MOVLW0X04
          MOVWFI2C_B
          MOVLW0X03
          MOVWFI2C_C
          MOVLW0X03
          MOVWFI2C_D
          MOVLW0X05
          MOVWFI2C_E
          MOVLW0X06
          MOVWFI2C_F
          MOVLW0X04
          MOVWFI2C_G
          ;=======================================
          START1
          CALLI2CBUS_INIT
          CALLREGTOI2CBUF
          CALLI2CWRITE
          CALLCLRI2CBUF
          CALLD10
          CALLI2CREAD
          CALLI2CBUFTOREG
          GOTOSTART1
          ;=======================================
          ;CLRI2CBUF
          ;---------------------------------------
          CLRI2CBUF
          BCFSTATUS,RP0
          MOVLWI2CBUF
          MOVWFFSR
          MOVLW0X08
          MOVWFCOUNT
          CLRLOOPCLRFINDF
          INCFFSR,F
          DECFSZCOUNT,F
          GOTOCLRLOOP
          RETURN
          ;---------------------------------------
          ;將各個(gè)REGSTER數(shù)據(jù)寫(xiě)入I2CBUF緩沖區(qū)
          ;---------------------------------------
          REGTOI2CBUF
          BCFSTATUS,RP0
          MOVLWI2CBUF
          MOVWFFSR
          MOVFI2C_A,W
          MOVWFINDF
          INCFFSR,F
          MOVFI2C_B,W
          MOVWFINDF
          INCFFSR,F
          MOVFI2C_C,W
          MOVWFINDF
          INCFFSR,F
          MOVFI2C_D,W
          MOVWFINDF
          INCFFSR,F
          MOVFI2C_E,W
          MOVWFINDF
          INCFFSR,F
          MOVFI2C_F,W
          MOVWFINDF
          INCFFSR,F
          MOVFI2C_G,W
          MOVWFINDF
          RETURN
          ;---------------------------------------
          ;將I2CBUF緩沖區(qū)數(shù)據(jù)寫(xiě)入各個(gè)REGSTER
          ;---------------------------------------
          I2CBUFTOREG
          BCFSTATUS,RP0
          MOVLWI2CBUF
          MOVWFFSR
          MOVFINDF,W
          MOVWFI2C_A
          INCFFSR,F
          MOVFINDF,W
          MOVWFI2C_B
          INCFFSR,F
          MOVFINDF,W
          MOVWFI2C_C
          INCFFSR,F
          MOVFINDF,W
          MOVWFI2C_D
          INCFFSR,F
          MOVFINDF,W
          MOVWFI2C_E
          INCFFSR,F
          MOVFINDF,W
          MOVWFI2C_F
          INCFFSR,F
          MOVFINDF,W
          MOVWFI2C_G
          RETURN
          ;=======================================
          ;將I2CBUF緩沖區(qū)內(nèi)的數(shù)據(jù)寫(xiě)入EEPROM
          ;=======================================
          I2CWRITE
          CALLI2CSTART
          BTFSSBUSSTA,BUS_BUSY
          GOTOTX_FAIL
          BCFBUSCON,SLAVE_RW
          CALLTX_SLAVE_ADDR
          BTFSSBUSSTA,TX_SUCCESS;SUCESSFULL?
          GOTOTX_FAIL
          CALLTX_DATA_ADDR
          BTFSSBUSSTA,TX_SUCCESS
          GOTOTX_FAIL
          MOVLWI2CBUF
          MOVWFFSR
          MOVLW07
          MOVWFCOUNT
          T_BYTE_LOOP
          MOVFINDF,W
          MOVWFTXBUF
          CALLI2CTXB
          BTFSSBUSSTA,TX_SUCCESS
          GOTOTX_FAIL
          INCFFSR,F
          DECFSZCOUNT,F
          GOTOT_BYTE_LOOP
          GOTOTX_PASS
          TX_FAILCALLI2CSTOP
          BCFBUSSTA,TX_PROGRESS
          BCFBUSSTA,TX_SUCCESS
          RETLWFALSE
          TX_PASS
          CALLI2CSTOP
          BCFBUSSTA,TX_PROGRESS
          RETLWTRUE
          ;---------------------------------------
          ;從EEPROM中讀出數(shù)據(jù)到I2CBUF寄存器
          ;---------------------------------------
          I2CREADBCFSTATUS,RP0
          BCFBUSSTA,RX_SUCCESS
          CALLI2CSTART
          BTFSSBUSSTA,BUS_BUSY
          GOTORX_FAIL
          BCFBUSCON,SLAVE_RW
          CALLTX_SLAVE_ADDR
          BTFSSBUSSTA,TX_SUCCESS
          GOTORX_FAIL
          CALLTX_DATA_ADDR
          BTFSSBUSSTA,TX_SUCCESS
          GOTORX_FAIL
          CALLI2CSTART
          BSFBUSCON,SLAVE_RW
          CALLTX_SLAVE_ADDR
          BTFSSBUSSTA,TX_SUCCESS
          GOTORX_FAIL
          BCFBUSSTA,LAST_BYTE_RX
          MOVLWI2CBUF
          MOVWFFSR
          MOVLW07
          MOVWFCOUNT
          R_BYTE_LOOP
          MOVLW0X01
          XORWFCOUNT,W
          BTFSCSTATUS,Z
          BSFBUSSTA,LAST_BYTE_RX
          CALLI2CRXB
          BTFSSBUSSTA,RX_SUCCESS
          GOTORX_FAIL
          MOVFRXBUF,W
          MOVWFINDF
          INCFFSR,F
          DECFSZCOUNT,F
          GOTOR_BYTE_LOOP
          GOTORX_PASS
          RX_FAILCALLI2CSTOP
          BCFBUSSTA,RX_PROGRESS
          BCFBUSSTA,RX_SUCCESS
          RETLWFALSE
          RX_PASSCALLI2CSTOP
          BCFSTATUS,RP0
          BCFBUSSTA,TX_PROGRESS
          BCFBUSSTA,RX_PROGRESS
          BSFBUSSTA,RX_SUCCESS
          RETLWTRUE
          ;=======================================
          ;I2C初始化
          ;=======================================
          I2CBUS_INIT
          BCFSTATUS,RP0
          MOVFRC,W
          ANDLW0X18
          MOVWFRC
          CLRFBUSSTA
          CLRFBUSCON
          RETURN
          ;=======================================
          ;傳送設(shè)備地址
          ;入口:BUSCON
          ;出口:BUSSTA
          ;=======================================
          TX_SLAVE_ADDR
          BCFSTATUS,RP0
          BCFBUSSTA,ACK_ERROR
          MOVLWSLAVEADDR
          MOVWFTXBUF
          BTFSCBUSCON,SLAVE_RW
          BSFTXBUF,R_NOT_W
          CALLI2CTXB
          BTFSCBUSSTA,TX_SUCCESS
          GOTOTXADDR_SUCCESS
          CLRWDT
          BTFSSBUSSTA,ACK_ERROR
          CALLI2CSTOP
          GOTOTXADDR_END
          TXADDR_SUCCESS
          CLRWDT
          TXADDR_END
          RETURN
          ;=======================================
          ;TX_DATA_ADDR發(fā)送寫(xiě)/讀的地址
          ;=======================================
          TX_DATA_ADDR
          BCFSTATUS,RP0
          MOVLWDATAADDRH
          MOVWFTXBUF
          CALLI2CTXB
          BCFSTATUS,RP0
          BTFSSBUSSTA,TX_SUCCESS
          GOTOTX_DATA_ADDR_ERROR
          MOVLWDATAADDRL
          MOVWFTXBUF
          CALLI2CTXB
          BCFSTATUS,RP0
          BTFSSBUSSTA,TX_SUCCESS
          GOTOTX_DATA_ADDR_ERROR
          GOTOTX_DATA_END
          TX_DATA_ADDR_ERROR
          BCFBUSSTA,TX_PROGRESS
          BCFBUSSTA,TX_SUCCESS
          BSFBUSSTA,ACK_ERROR
          TX_DATA_END
          RETURN
          ;=======================================
          ;向EEPROM輸出一個(gè)8位數(shù)據(jù),并檢測(cè)EEPROM的ACK信號(hào)
          ;入口:TXBUF寄存器
          ;BUSSTA寄存器
          ;出口:EEPROM存儲(chǔ)器
          ;BUSSTA寄存器
          ;======================================
          I2CTXBBCFSTATUS,RP0
          BSFBUSSTA,TX_PROGRESS
          BCFBUSSTA,TX_SUCCESS
          MOVLW0X08
          MOVWFBCOUNT
          TXLOOPCLRWDT
          BSFSTATUS,RP0
          BCFTRISC,SCL
          NOP
          BCFTRISC,SDA
          BCFSTATUS,RP0
          RLFTXBUF,F
          BSFSTATUS,RP0
          BTFSCSTATUS,C
          BSFTRISC,SDA
          NOP
          BSFTRISC,SCL
          NOP
          NOP
          BCFSTATUS,RP0
          DECFSZBCOUNT,F
          GOTOTXLOOP
          ;---------------------------------------
          ;檢測(cè)是EEPROM否有ACK信號(hào)產(chǎn)生,產(chǎn)生為正常
          ;檢測(cè)方法:
          ;1.將RC口的SCL.SDA分別設(shè)置為輸出和輸入狀態(tài)
          ;2.延時(shí)2個(gè)指令周期,將SCL設(shè)置為高電平
          ;3.延時(shí)2個(gè)指令周期,檢測(cè)RC口SDA的狀態(tài)
          ;4.如果為高電平,設(shè)置錯(cuò)誤狀態(tài),返回
          ;5.如果為低電平,延時(shí)2個(gè)指令周期后,將RC口SCL設(shè)置為低電平,繼續(xù)執(zhí)行
          ;---------------------------------------
          BSFSTATUS,RP0
          BCFTRISC,SCL
          BSFTRISC,SDA
          NOP
          NOP
          BSFTRISC,SCL
          NOP
          BCFSTATUS,RP0
          BTFSCRC,SDA
          GOTOTX_ERR
          BSFSTATUS,RP0
          BCFTRISC,SCL
          BCFSTATUS,RP0
          BCFBUSSTA,TX_PROGRESS
          BSFBUSSTA,TX_SUCCESS
          BCFBUSSTA,ACK_ERROR
          GOTOTX_END
          TX_ERRBCFBUSSTA,TX_PROGRESS
          BCFBUSSTA,TX_SUCCESS
          BSFBUSSTA,ACK_ERROR
          TX_ENDRETURN
          ;=======================================
          ;從EEPROM中讀出8位的數(shù)據(jù),并發(fā)送發(fā)送ACK信號(hào)
          ;入口:EEPROM存儲(chǔ)器
          ;BUSCON寄存器
          ;出口:RXBUF寄存器
          ;BUSSTA寄存器
          ;=======================================
          I2CRXBBCFSTATUS,RP0
          BSFBUSSTA,RX_PROGRESS
          BCFBUSSTA,RX_SUCCESS
          MOVLW0X08
          MOVWFBCOUNT
          RXLOOPCLRWDT
          BSFSTATUS,RP0
          BCFTRISC,SCL;定義TRISCSCL>為輸出
          BSFTRISC,SDA;定義TRISCSDA>為輸入
          NOP
          NOP
          BSFTRISC,SCL;TRISCSCL>輸出高電平
          NOP
          BCFSTATUS,RP0
          BCFSTATUS,C
          BTFSCRC,SDA;原指令為BTFSCTRISC,SDA
          BSFSTATUS,C
          RLFRXBUF,F
          DECFSZBCOUNT,F
          GOTORXLOOP
          ;---------------------------------------
          ;發(fā)送ACK信號(hào)到EEPROM
          ;判斷接收的是否為最后一個(gè)字節(jié)
          ;LAST_BYTE_RX為1,是SDA發(fā)送一個(gè)高電平,結(jié)束
          ;LAST_BYTE_RX為0,不是SDA發(fā)送一個(gè)低電平ACK,繼續(xù)接收
          ;---------------------------------------
          BSFSTATUS,RP0
          BCFTRISC,SCL
          BCFTRISC,SDA
          BTFSCBUSCON,LAST_BYTE_RX;檢測(cè)是否是最后一個(gè)字節(jié)
          BSFTRISC,SDA;是最后一個(gè)字節(jié)
          NOP;發(fā)送ACK信號(hào)
          BSFTRISC,SCL
          NOP
          NOP
          NOP
          NOP
          BCFTRISC,SCL
          BCFSTATUS,RP0
          BCFBUSSTA,RX_PROGRESS
          BSFBUSSTA,RX_SUCCESS
          RETURN
          ;=======================================
          ;I2C開(kāi)始信號(hào)
          ;輸入:無(wú)
          ;輸出:BUFSSTABUS_BUSY>
          ;=======================================
          I2CSTART
          BSFSTATUS,RP0
          BSFTRISC,SDA;1US
          NOP;1US
          BSFTRISC,SCL;1US
          NOP
          NOP
          BCFTRISC,SDA
          NOP
          NOP
          BCFSTATUS,RP0
          BSFBUSSTA,BUS_BUSY
          RETURN
          ;=======================================
          ;I2C結(jié)束信號(hào)
          ;輸入:無(wú)
          ;輸出:BUSSTABUS_BUSY>
          ;=======================================
          I2CSTOP
          BSFSTATUS,RP0
          BCFTRISC,SCL
          BCFTRISC,SDA
          BSFTRISC,SCL
          NOP
          NOP
          BSFTRISC,SDA
          NOP
          BCFSTATUS,RP0
          BCFBUSSTA,BUS_BUSY
          RETURN
          ;=======================================
          ;D10@
          ;clockin4Mhz
          ;delay10ms
          ;=======================================
          D10MOVLW0X0D
          MOVWFREG1
          LOOP2MOVLW0XFF
          MOVWFREG2
          LOOP1DECFSZREG2,f
          GOTOLOOP1
          DECFSZREG1,f
          GOTOLOOP2
          RETURN
          ;=======================================
          I2CERRCLRWDT
          NOP
          NOP
          NOP
          RETURN
          END

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