OpenMoCo / Mbed 2 deprecated QEIx4_Example

QEIx4 Example

Dependencies:   QEIx4 mbed

main.cpp@0:bbf48777e304, 2014-09-02 (annotated)

Committer:
jocis
Date:
Tue Sep 02 18:24:13 2014 +0000
Revision:
0:bbf48777e304
Child:
2:7c787d83331e
Added documentation

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jocis 0:bbf48777e304 1 #include "mbed.h"
jocis 0:bbf48777e304 2 #include "QEIx4.h"
jocis 0:bbf48777e304 3
jocis 0:bbf48777e304 4 DigitalOut myled(LED1);
jocis 0:bbf48777e304 5 Timer t;
jocis 0:bbf48777e304 6
jocis 0:bbf48777e304 7 // ports for nxp LPC 1768
jocis 0:bbf48777e304 8 QEIx4 qei1(p30, p29, p28); // QEI with index signal for zeroing
jocis 0:bbf48777e304 9 QEIx4 qei2(p27, p26, NC); // QEI only with AB signals
jocis 0:bbf48777e304 10 QEIx4 qei3(p25, p24, NC, false); // QEI without interrups for polling mode
jocis 0:bbf48777e304 11
jocis 0:bbf48777e304 12 int main() {
jocis 0:bbf48777e304 13 t.start();
jocis 0:bbf48777e304 14
jocis 0:bbf48777e304 15 qei1.SetZeroOnIndex(true); // Set the flag to zero counter on next index signal rises
jocis 0:bbf48777e304 16
jocis 0:bbf48777e304 17 while(1)
jocis 0:bbf48777e304 18 {
jocis 0:bbf48777e304 19 qei3.poll(); // poll manually without interrupt - sampling in this loop with about 2kHz
jocis 0:bbf48777e304 20
jocis 0:bbf48777e304 21 if ( t.read_ms() > 500 ) // every half second
jocis 0:bbf48777e304 22 {
jocis 0:bbf48777e304 23 t.reset();
jocis 0:bbf48777e304 24 t.start();
jocis 0:bbf48777e304 25 myled = !myled;
jocis 0:bbf48777e304 26
jocis 0:bbf48777e304 27 printf ( "\r\n%6d %6d %6d", (int)qei1, (int)qei2, (int)qei3 ); // print counter values
jocis 0:bbf48777e304 28 }
jocis 0:bbf48777e304 29
jocis 0:bbf48777e304 30 wait_us(500); // for about 2kHz
jocis 0:bbf48777e304 31 }
jocis 0:bbf48777e304 32 }