waveblender/drone.c

#include <stdint.h>
#include "system.h"
#include "display.h"
#include "systick.h"
#include "button.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "unicore-mx/stm32/gpio.h"
#include "unicore-mx/stm32/rcc.h"
#include "ui.h"
#include "timer.h"
#include "led.h"
#include "drone.h"
#include "drums.h"
#include "pot.h"
#include "settings.h"

#define MUTE { 0 , 0 }


void drone_mute(void)
{
    pot_set(0, 0);
    pot_set(1, 0);
    gpio_clear(GPIOE, GPIO2);
    gpio_clear(GPIOE, GPIO3);
}

void drone_beat(int pattern_pos)
{
    static int test_lfo_step = 0;
    static int test_lfo = 0;
    int lfo_depth = 80;
    int lfo_rate = 7;
    int lfo_step = 2;
    int tgt_env;
    static struct drone_slot *pattern;
    struct drone_slot *key; 
    pattern = Settings->drone[Settings->current_pattern].data;
    key = &pattern[pattern_pos];

    if ((key->pitch == 0) && (key->env == 0)) {
        pot_set(0, 99);
        pot_set(1, 0);
        gpio_clear(GPIOE, GPIO2);
        gpio_clear(GPIOE, GPIO3);
        return;
    }
    pot_set(0, 0);
    pot_set(1, 99);
    gpio_set(GPIOE, GPIO2);
    gpio_set(GPIOE, GPIO3);


    if ((pattern_pos % lfo_step) == 0) {
        if (test_lfo_step == 0) {
            test_lfo+=lfo_rate;
            if (test_lfo > lfo_depth)
                test_lfo_step = 1;
        } else {
            test_lfo-=lfo_rate;
            if (test_lfo < (0 - lfo_depth))
                test_lfo_step = 0;
        }
    }


    tgt_env = key->env + test_lfo;
    if (tgt_env < 0) {
        tgt_env = 0;
        test_lfo_step = 0;
    }
    if (tgt_env > 99) {
        tgt_env = 99;
        test_lfo_step = 1;
    }
    pot_set(0, key->pitch);
    pot_set(1, tgt_env);
}


#define TRIG_PIN (GPIO2 | GPIO3)
void drone_init(void)
{
    rcc_periph_clock_enable(RCC_GPIOE);
    gpio_mode_setup(GPIOE, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, TRIG_PIN);
    gpio_set_output_options(GPIOE, GPIO_OTYPE_OD, GPIO_OSPEED_100MHZ, TRIG_PIN); 
    gpio_clear(GPIOE, TRIG_PIN);
}