You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
2.2 KiB
83 lines
2.2 KiB
/* |
|
* wiringShift.c: |
|
* Emulate some of the Arduino wiring functionality. |
|
* |
|
* Copyright (c) 2009-2012 Gordon Henderson. |
|
*********************************************************************** |
|
* This file is part of wiringPi: |
|
* https://projects.drogon.net/raspberry-pi/wiringpi/ |
|
* |
|
* wiringPi is free software: you can redistribute it and/or modify |
|
* it under the terms of the GNU Lesser General Public License as published by |
|
* the Free Software Foundation, either version 3 of the License, or |
|
* (at your option) any later version. |
|
* |
|
* wiringPi is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
* GNU Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public License |
|
* along with wiringPi. If not, see <http://www.gnu.org/licenses/>. |
|
*********************************************************************** |
|
*/ |
|
|
|
#include <stdint.h> |
|
|
|
#include "wiringPi.h" |
|
#include "wiringShift.h" |
|
|
|
/* |
|
* shiftIn: |
|
* Shift data in from a clocked source |
|
********************************************************************************* |
|
*/ |
|
|
|
uint8_t shiftIn (uint8_t dPin, uint8_t cPin, uint8_t order) |
|
{ |
|
uint8_t value = 0 ; |
|
int8_t i ; |
|
|
|
if (order == MSBFIRST) |
|
for (i = 7 ; i >= 0 ; --i) |
|
{ |
|
digitalWrite (cPin, HIGH) ; |
|
value |= digitalRead (dPin) << i ; |
|
digitalWrite (cPin, LOW) ; |
|
} |
|
else |
|
for (i = 0 ; i < 8 ; ++i) |
|
{ |
|
digitalWrite (cPin, HIGH) ; |
|
value |= digitalRead (dPin) << i ; |
|
digitalWrite (cPin, LOW) ; |
|
} |
|
|
|
return value; |
|
} |
|
|
|
/* |
|
* shiftOut: |
|
* Shift data out to a clocked source |
|
********************************************************************************* |
|
*/ |
|
|
|
void shiftOut (uint8_t dPin, uint8_t cPin, uint8_t order, uint8_t val) |
|
{ |
|
int8_t i; |
|
|
|
if (order == MSBFIRST) |
|
for (i = 7 ; i >= 0 ; --i) |
|
{ |
|
digitalWrite (dPin, val & (1 << i)) ; |
|
digitalWrite (cPin, HIGH) ; |
|
digitalWrite (cPin, LOW) ; |
|
} |
|
else |
|
for (i = 0 ; i < 8 ; ++i) |
|
{ |
|
digitalWrite (dPin, val & (1 << i)) ; |
|
digitalWrite (cPin, HIGH) ; |
|
digitalWrite (cPin, LOW) ; |
|
} |
|
}
|
|
|