[136] | 1 | /*
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| 2 | Copyright (c) 2011 Arduino. All right reserved.
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| 3 |
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| 4 | This library is free software; you can redistribute it and/or
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| 5 | modify it under the terms of the GNU Lesser General Public
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| 6 | License as published by the Free Software Foundation; either
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| 7 | version 2.1 of the License, or (at your option) any later version.
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| 8 |
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| 9 | This library is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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| 12 | See the GNU Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public
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| 15 | License along with this library; if not, write to the Free Software
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| 16 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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| 17 | */
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| 18 |
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| 19 | #include <stdint.h>
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| 20 | #include "wiring_shift.h"
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| 21 | #include "wiring_digital.h"
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| 22 | #include "wiring_private.h"
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| 23 |
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| 24 | #ifdef __cplusplus
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| 25 | extern "C"{
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| 26 | #endif
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| 27 |
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| 28 | uint32_t shiftIn( uint32_t ulDataPin, uint32_t ulClockPin, uint32_t ulBitOrder )
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| 29 | {
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| 30 | uint8_t value = 0 ;
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| 31 | uint8_t i ;
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| 32 |
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| 33 | for ( i=0 ; i < 8 ; ++i )
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| 34 | {
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| 35 | digitalWrite( ulClockPin, HIGH ) ;
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| 36 |
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| 37 | if ( ulBitOrder == LSBFIRST )
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| 38 | {
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| 39 | value |= digitalRead( ulDataPin ) << i ;
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| 40 | }
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| 41 | else
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| 42 | {
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| 43 | value |= digitalRead( ulDataPin ) << (7 - i) ;
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| 44 | }
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| 45 |
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| 46 | digitalWrite( ulClockPin, LOW ) ;
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| 47 | }
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| 48 |
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| 49 | return value ;
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| 50 | }
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| 51 |
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| 52 | void shiftOut( uint32_t ulDataPin, uint32_t ulClockPin, uint32_t ulBitOrder, uint32_t ulVal )
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| 53 | {
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| 54 | uint8_t i ;
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| 55 |
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| 56 | for ( i=0 ; i < 8 ; i++ )
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| 57 | {
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| 58 | if ( ulBitOrder == LSBFIRST )
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| 59 | {
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| 60 | digitalWrite( ulDataPin, !!(ulVal & (1 << i)) ) ;
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| 61 | }
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| 62 | else
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| 63 | {
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| 64 | digitalWrite( ulDataPin, !!(ulVal & (1 << (7 - i))) ) ;
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| 65 | }
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| 66 |
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| 67 | digitalWrite( ulClockPin, HIGH ) ;
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| 68 | digitalWrite( ulClockPin, LOW ) ;
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| 69 | }
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| 70 | }
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| 71 |
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| 72 | #ifdef __cplusplus
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| 73 | } // extern "C"
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| 74 | #endif
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