diff options
Diffstat (limited to 'src/wiring/wiring_shift.c')
-rw-r--r-- | src/wiring/wiring_shift.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/wiring/wiring_shift.c b/src/wiring/wiring_shift.c new file mode 100644 index 0000000..c138b56 --- /dev/null +++ b/src/wiring/wiring_shift.c @@ -0,0 +1,42 @@ +/* copied straight from arduino/wiring_shift.c */ + +/* + wiring_shift.c - shiftOut() function + Part of Arduino - http://www.arduino.cc/ + + Copyright (c) 2005-2006 David A. Mellis + + This library 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 2.1 of the License, or (at your option) any later version. + + This library 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 this library; if not, write to the + Free Software Foundation, Inc., 59 Temple Place, Suite 330, + Boston, MA 02111-1307 USA + + $Id: wiring.c 248 2007-02-03 15:36:30Z mellis $ +*/ + +#include "wiring.h" + +void shiftOut(uint8_t dataPin, uint8_t clockPin, uint8_t bitOrder, byte val) +{ + int i; + + for (i = 0; i < 8; i++) { + if (bitOrder == LSBFIRST) + digitalWrite(dataPin, !!(val & (1 << i))); + else + digitalWrite(dataPin, !!(val & (1 << (7 - i)))); + + digitalWrite(clockPin, HIGH); + digitalWrite(clockPin, LOW); + } +} |