Trombetta Michele / ttl_74HC595

Small library for controll the TTL74HC595, who is a SerialIn-ParallelOut

ttl_74HC595.cpp@1:db4af8094f4c, 2011-05-06 (annotated)

Committer:
trombettamichele
Date:
Fri May 06 18:58:53 2011 +0000
Revision:
1:db4af8094f4c
Parent:
0:d78bcf13e9ed 

        

        
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#include "mbed.h"





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#include "ttl_74HC595.h"





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//  Small library for controll the TTL74HC595, who is a SerialIn-ParallelOut





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//  Created by Michele Trombetta





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//  Copyright 2010 5OFT. All rights reserved.





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ttl_74HC595::ttl_74HC595(PinName DS, PinName SH_CLK, PinName ST_CLK, PinName OE): _DS(DS), _SH_CLK(SH_CLK), _ST_CLK(ST_CLK), _OE(OE) {





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}





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void ttl_74HC595::send_data(unsigned char data) {





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    for (char i=0; i<8; i++) {





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        _SH_CLK = 0;





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        _DS = data & 0x01;





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        data >>= 1;





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        _SH_CLK = 1;





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    }





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}





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void ttl_74HC595::store_data() {





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    _ST_CLK = 1;





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    _ST_CLK = 0;





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}





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void ttl_74HC595::send(unsigned char data) {





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    send_data(data);





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    store_data();





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}





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void ttl_74HC595::setOE(bool enable) {





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    _OE = enable ? 0 : 1;





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}