jim hamblen
/
Pushbutton_NoBounce_Demo
Pushbutton counter demo with debounce
main.cpp
- Committer:
- 4180_1
- Date:
- 2011-09-20
- Revision:
- 0:ca31694551ed
File content as of revision 0:ca31694551ed:
#include "mbed.h" #include "DebounceIn.h" // must import Cookbook Debounce library into project // URL: http://mbed.org/users/AjK/libraries/DebounceIn/lky9pc DigitalOut myled(LED1); DigitalOut myled2(LED2); DigitalOut myled3(LED3); DigitalOut myled4(LED4); DebounceIn pb(p8); // SPST Pushbutton count demo using internal PullUp function // no external PullUp resistor needed // Pushbutton from P8 to GND. // Demonstrates need for debounce - will not count more than once per button hit // This ocuurs on all switches due to mechanical contact bounce int main() { int count=0; int old_pb=0; int new_pb; // Use internal pullup for pushbutton pb.mode(PullUp); // Delay for initial pullup to take effect wait(.001); while(1) { new_pb = pb; if ((new_pb==0) && (old_pb==1)) count++; myled4 = count & 0x01; myled3 = (count & 0x02)>>1; myled2 = (count & 0x04)>>2; myled = (count & 0x08)>>3; old_pb = new_pb; } }