sound-experiment-02/generator.c

#include <stdint.h>
#include <stdlib.h>
#include <msp430g2553.h>
#include "generator.h"






const float BASE_FREQUENCY = 2457600.0;
const float MAIN_DIVIDER = 8388606.0;  // 2^23


static uint16_t frequencyToDivider(float freq) {
  float n = (freq * MAIN_DIVIDER) / BASE_FREQUENCY;
  uint16_t i = (uint16_t) n;
  if (n - i >= 0.5) {
    i += 1;
  }
  return i;
}

void generatorInit() {
  P1DIR |= BIT0 | BIT1 | BIT2 | BIT3;
  P1OUT |= BIT0 | BIT1 | BIT2 | BIT3;

  genShifter(0, frequencyToDivider(1000));
  genShifter(1, frequencyToDivider(10));
}