51單片機(jī)對(duì)SAA7113初始化和控制的程序

1、51單片機(jī)對(duì)saa7113初始化和控制的程序用51對(duì)7113初始化和控制saa7113的初始化就是對(duì)寄存器配置合適的參數(shù)，使其能夠有符合要求的輸出。寄存器配置通過(guò)i2c來(lái)舉行，無(wú)數(shù)可以控制i2c總線的器件都可以作為主器件對(duì)7113舉行初始化，這里介紹用初始化7113的例子。51單片機(jī)和7113的硬件銜接十分容易，只要把單片機(jī)的兩個(gè)i/o口(如p1.0、p1.0)挺直和7113的scl、sda管腳相連，再加上上拉即可。用單片機(jī)初始化7113的主要任務(wù)是程序的編寫(xiě)，首先要認(rèn)識(shí)i2c總線協(xié)議，按照i2c總線的原理寫(xiě)出啟動(dòng)、停止、應(yīng)答信號(hào)等的子程序，由子程序再寫(xiě)動(dòng)身送、接收1個(gè)字節(jié)的程序，然后按照71

2、13的寄存器操作格式寫(xiě)出讀寫(xiě)寄存器的程序，最后按照以上的子程序?qū)懗龀跏蓟?113的程序段。對(duì)7113的控制普通是轉(zhuǎn)變色度、亮度等指標(biāo)以及輸出管腳的輸出信號(hào)，這可以通過(guò)修改相應(yīng)寄存器的值來(lái)完成，程序上寫(xiě)出“讀寫(xiě)指令”即可。下面以程序段的形式給出初始化saa7113以及讀寫(xiě)寄存器的詳細(xì)例子，以供參考。sda bit p1.0scl bit p1.1i2c_error bit 00h ;i2c總線數(shù)據(jù)傳輸出錯(cuò)標(biāo)記deviceaddressw equ 4ah ;7113器件地址+寫(xiě)deviceaddressr equ 4bh ;7113器件地址+讀subaddress equ 4dh ;7113寄存器

3、地址字節(jié)在單片機(jī)中的存放地址data_i2c equ 50h ;設(shè)置寫(xiě)入或讀出數(shù)據(jù)在單片機(jī)中的存放地址;*啟動(dòng)*i2c_start: setb sdanopsetb sclnopclr sdanopclr sclret;*停止*i2c_stop: clr sdanopsetb sclnopsetb sdanopret;*送應(yīng)答位*send_ack: clr sclnopclr sdanopsetb sclnop?nopclr sclnopsetb sdaret;*送非應(yīng)答位*send_noack: setb sdanopsetb sclnopnopclr sclnopret;*檢查應(yīng)答位*ch

4、eck_ack: nopclr sclnopsetb sdanopsetb sclnopnopmov c, sdamov i2c_error, cclr sclnopret;*發(fā)送1字節(jié)數(shù)據(jù)，待送數(shù)據(jù)在a中*i2c_send_1byte:mov r0, 8send100: rlc amov sda, cnopsetb sclnopnopclr scldjnz r0, send100ret;*接收1字節(jié)數(shù)據(jù)，接收數(shù)據(jù)放在a中*i2c_receive_1byte:mov r0, 8recv100: setb sdanopsetb sclnopnopnopmov c, sdaclr sclrlc a

5、djnz r0, recv100ret;*通過(guò)i2c總線向某一寄存器寫(xiě)入一個(gè)字節(jié)數(shù)據(jù)*i2c_write: acall i2c_start ;發(fā)啟動(dòng)信號(hào)mov a， deviceaddressw ;調(diào)7113地址+寫(xiě)acall i2c_send_1byte ;發(fā)送7113地址及“寫(xiě)”指令acall check_ack ;檢查7113的應(yīng)答信號(hào)jnb i2c_error, wr200 ;應(yīng)答正確，繼續(xù)wr100: acall i2c_stop ;應(yīng)答不對(duì)，返回retwr200: mov a, subaddress ;調(diào)寄存器地址acall i2c_send_1byte ;發(fā)送寄存器地址acall

6、 check_ack ;檢查7113的應(yīng)答信號(hào)jb i2c_error, wr100 ;應(yīng)答不對(duì)，返回mov a, data_i2c ;調(diào)預(yù)備寫(xiě)入的數(shù)據(jù)acall i2c_send_1byte ;發(fā)送數(shù)據(jù)字節(jié)acall check_ackjb i2c_error, wr100acall i2c_stop ;發(fā)停止信號(hào)ret;*通過(guò)i2c總線讀出某一寄存器的數(shù)據(jù)*i2c_read: acall i2c_startmov a, deviceaddressw ;調(diào)7113地址，寫(xiě)入acall i2c_send_1byteacall check_ackjnb i2c_error, rd200rd100

7、: acall i2c_stopretrd200: mov a, subaddress ;調(diào)要讀的寄存器地址acall i2c_send_1byte ; 發(fā)送寄存器地址字節(jié)acall check_ackjb i2c_error, rd100acall i2c_start ;重發(fā)起動(dòng)信號(hào)mov a, deviceaddressr ;調(diào)7113地址，讀acall i2c_send_1byteacall check_ackjb i2c_error, rd100acall i2c_receive_1byte ;接收讀出的數(shù)據(jù)mov data_i2c,a ;讀出數(shù)據(jù)轉(zhuǎn)存acall send_noack

8、;發(fā)送非應(yīng)答位acall i2c_stop ;停止ret;*初始化7113，配置各寄存器*init_saa7113: mov dptr, saa7113_subaddressmov r7, 28init100: mov a, 0mov c a, a+dptrmov subaddress, a ;調(diào)寄存器地址mov a,28movc a, a+dptrmov data_i2c, a ;調(diào)寄存器配置數(shù)據(jù)inc dptracall i2c_write ;配置1個(gè)寄存器jb i2c_error, init200djnz r7,init100init200: ret;*saa7113寄存器初始化配置數(shù)據(jù)*saa7113_subaddress:db 01h,02h,03h,04h,05h,06h,07h,08h,09h,0ah,0bh,0ch,0dh,0ehdb 0fh,10h,11h,12h,13h,15h,16h,17h,40h,58h,59h,5ah,5bh,5eh;共28個(gè)i2c_reg_value_ai11:db 08h,0c0h,33h,00h,00h,0ebh,0e0h,0b8h,01h,7eh,46h,43h,01h,01hdb 0fh,00h,0ch,0a7h,00h,00h,00h,00h,02h,00h,54h,07h,80h,00h;*