Changing main.cc to main.c fixed all my problems

main.c

@@ -0,0 +1,77 @@
+#include <hardware/irq.h>
+#include <pico/time.h>
+#include <sys/types.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <math.h>
+
+#include "hardware/gpio.h"
+#include "hardware/pwm.h"
+#include "hardware/adc.h"
+#include "mux.h"
+#include "pico/multicore.h"
+#include "pico/stdlib.h"
+
+#include "buttons.h"
+#include "const.h"
+#include "macro.h"
+#include "state.h"
+#include "pwm.h"
+
+state_t state;
+
+void init_all() {
+	stdio_init_all();
+	puts("Starting PIN initialization");
+	const uint8_t out_gpio[] = {MUX_S0,MUX_S1,MUX_S2, STATUS_LED};
+	const uint8_t in_gpio[] = {VCO_BUTTON,QUANT_BUTTON,AMEN_BUTTON};
+	const uint8_t adc_gpio[] = {MUX0,MUX1};
+
+	for (uint8_t i=0; i < ARRAY_LENGTH(out_gpio); i++) {
+		gpio_init(out_gpio[i]);
+		gpio_set_dir(out_gpio[i], true);
+	}
+
+	for (uint8_t i=0; i < ARRAY_LENGTH(in_gpio); i++) {
+		gpio_init(in_gpio[i]);
+		gpio_set_dir(in_gpio[i], false);
+	}
+	adc_init();
+	for (uint8_t i=0; i < ARRAY_LENGTH(adc_gpio); i++) {
+		adc_gpio_init(adc_gpio[i]);
+		adc_select_input(i);
+	}
+
+	// PWM bullshit
+	gpio_set_function(AUDIO_OUT, GPIO_FUNC_PWM);
+
+	uint slice = pwm_gpio_to_slice_num(AUDIO_OUT);
+	pwm_config cfg = pwm_get_default_config();
+	pwm_config_set_wrap(&cfg, 3400);
+	pwm_init(slice, &cfg, true);
+
+	pwm_clear_irq(slice);
+	pwm_set_irq_enabled(slice, true);
+	irq_set_exclusive_handler(PWM_IRQ_WRAP, pwm_isr);
+	irq_set_enabled(PWM_IRQ_WRAP, true);
+}
+
+__attribute__((noreturn))
+void core1_main(void) {
+	while (1) {
+		update_buttons();
+		update_inputs();
+		sleep_ms(1);
+	}
+}
+
+__attribute__((noreturn))
+int main() {
+	init_all();
+
+	multicore_launch_core1(core1_main);
+
+	while (1) {}
+}
+