#include "pico/stdlib.h"
#include "hardware/dac.h"
#include <math.h>

#define NUM_SAMPLES 100
#define AMPLITUDE 2047  // Half of the DAC's range (0 to 4095)
#define FREQUENCY 1000  // Frequency of the sine wave in Hz
#define SAMPLE_RATE 20000  // Sampling rate in Hz

void generate_sine_wave(float frequency, uint16_t *buffer, size_t buffer_length) {
    float increment = 2.0 * M_PI * frequency / SAMPLE_RATE;
    for (size_t i = 0; i < buffer_length; i++) {
        float value = AMPLITUDE * sin(increment * i);
        buffer[i] = (uint16_t)(AMPLITUDE + value);  // Offset by AMPLITUDE to keep the wave positive
    }
}

int main() {
    stdio_init_all();

    uint16_t waveform[NUM_SAMPLES];
    generate_sine_wave(FREQUENCY, waveform, NUM_SAMPLES);

    //dac_init(0);  // Initialize DAC on GPIO0
    dac_set_irq_enabled(true);

    while (true) {
        for (size_t i = 0; i < NUM_SAMPLES; i++) {
            dac_write_buffer(dac_hw0, waveform, NUM_SAMPLES);
            sleep_ms(1000 / SAMPLE_RATE);  // Adjust sleep time for desired frequency
        }
    }

    return 0;
}