iterate through loop (timer/bpm)

**planckepoch** · 05-23-2018

Hi,

I just signed up to these forums to help me with my new found hobby in c++

I'm wanting to iterate 16 steps through a loop at a specific tempo/bpm. I know in the Arduino environment there is the millis() statement used with an if statement but I'm struggling with c++.

At some point I want to develop audio dsp applications on ARM STM32.

Do I have to set some kind of clock speed?

for instance - 1 x 16 step sequence would include 96 pulses/cycles. (standard 24pulses per quarter note.)

if the sequence was running at 120beats per minute then:

120 * 96 = 11,520 pulses/cycles

11,520 / 60s = 192 hz

so I know how to sort of get my clock/tempo but how do I get a loop to run at this tempo and also execute some code at each step in the sequence?

I've been reading BasicSynth, and a beginners guide to DSP as well as C++ and I'm currently doing a video course on c++ on udemy to help me, if anyone has any other recommendations in this field that would help it would be a great help.

P

**john.c** · 05-23-2018

Code:

//#define BUSY_WAIT    // uncomment for busy wait

#include <iostream>
#include <chrono>
#include <thread>

void proc() {
    static int i = 0;
    std::cout << i++ << '\n';
}

int main() {
    using namespace std;
    using rate = chrono::duration<chrono::steady_clock::rep, ratio<1, 10>>;

    auto next = chrono::steady_clock::now() + rate{1};

    while (true) {

        proc();

#ifdef BUSY_WAIT
        while (chrono::steady_clock::now() < next)
            ;
#else
        this_thread::sleep_until(next);
#endif

        next += rate{1};
    }

    return 0;
}

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