Part Number: DRV2605L
Hello,
Using DRV2605L to control LRA motor, I want to change the amplitude-like sine function (fading up & down within 100ms). I think PWM duty cycle modulation
could change the amplitude. Because I want to design an amplitude-changing pattern within a specific time (100ms), I used timer interrupt registers (Arduino).
However, the amplitude didn't change anymore.
Here is the code: (I hope it could help you understand)
#include<Wire.h>
#include<Sparkfun_DRV2605L.h>
#define HMD_ADDR 0x5A
SFE_HMD_DRV2605L HMD;
constint analogOutPin = 9;
volatileint pwmvalue = 0;
volatileint direction = 10;
voidsetupTimer1() {
noInterrupts();
// Clear registers
TCCR1A = 0;
TCCR1B = 0;
TCNT1 = 0;
// 1000 Hz (16000000/((249+1)*64))
OCR1A = 249;
// CTC
TCCR1B |= (1<< WGM12);
// Prescaler 64
TCCR1B |= (1<< CS11) | (1<< CS10);
// Output Compare Match A Interrupt Enable
TIMSK1 |= (1<< OCIE1A);
interrupts();
}
voidsetup(){
Wire.begin();
HMD.begin();
HMD.Mode(0x03);
HMD.writeDRV2605L(OVERDRIVECLAMP_REG,0xFF);
HMD.writeDRV2605L(CONTROL3_REG,0xA1);
HMD.MotorSelect(0x86); // Related to Feedback Control (Address : 0x1A)
HMD.Library(6);
pinMode (analogOutPin,OUTPUT);
setupTimer1();
}
voidloop(){}
voidpwmStep(){
analogWrite(analogOutPin, pwmvalue);
pwmvalue += direction;
if (pwmvalue==0){
direction=10;
}
if(pwmvalue==255){
direction=-10;
}
}
ISR(TIMER1_COMPA_vect) {
pwmStep();
}
To use timer interrupt registers, are there anything to consider ?
