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QEIx4 Example
Diff: main.cpp
- Revision:
- 3:922c100de8cd
- Parent:
- 2:7c787d83331e
--- a/main.cpp Tue Sep 30 12:35:07 2014 +0000 +++ b/main.cpp Wed Oct 01 10:23:33 2014 +0000 @@ -2,18 +2,19 @@ #include "QEIx4.h" DigitalOut LEDalive(LED1); +DigitalOut LEDzero(LED2); DigitalOut LEDup(LED4); DigitalOut LEDdown(LED3); -Timer t; +Timer t; // timer for polling // ports for nxp LPC 1768 -QEIx4 qei1(p30, p29, p28, (QEIx4::EMODE)(QEIx4::IRQ | QEIx4::SPEED)); // QEI with index signal for zeroing -QEIx4 qei2(p21, p22, NC, QEIx4::IRQ_NO_JAMMING); // QEI with AB signals only -QEIx4 qei3(p25, p24, NC, QEIx4::POLLING); // QEI without interrups in polling mode +QEIx4 qei1(p30, p29, p28, (QEIx4::EMODE)(QEIx4::IRQ | QEIx4::SPEED)); // QEI with index signal for zeroing +QEIx4 qei2(p21, p22, NC, QEIx4::IRQ_NO_JAMMING); // QEI with AB signals only +QEIx4 qei3(p25, p24, NC, QEIx4::POLLING); // QEI without interrups in polling mode -// The callback function. -void myCallback(int value) +// The callback functions +void myCounterChangeCallback(int value) { static int valueLast=-1; @@ -24,17 +25,24 @@ LEDdown = !LEDdown; LEDup = 0; } - valueLast=value; + valueLast = value; +} + +void myIndexTriggerCallback(int value) +{ + qei1 = 0; // reset counter + LEDzero = 1; } int main() { t.start(); - qei1.setZeroOnIndex(true); // set the flag to zero counter on next index signal rises + qei1.setIndexTrigger(true); // set the flag to zero counter on next index signal rises qei1.setSpeedFactor(1.0f); // factor to scale from Hz (edges pe second = 4 * CPS) to user units (1.0=Hz, 1/(4*CPR)=rps, 1/(60*4*CPR)=rpm, 360/(4*CPR)=°/s, ...) + qei3.attachIndexTrigger(myIndexTriggerCallback); - qei3.attachCounterChange(myCallback); + qei3.attachCounterChange(myCounterChangeCallback); while(1) { qei3.poll(); // poll manually without interrupt - sampling in this loop with about 2kHz