forgor main.cc 💀

buttons.c

@@ -4,8 +4,11 @@
 #include <pico/types.h>
 #include "hardware/gpio.h"
 
-void handle_vco_change(uint gpio, uint32_t events) {
-	if (gpio == VCO_BUTTON && (events & GPIO_IRQ_EDGE_RISE)) {
+void handle_vco_change(void) {
+	static bool btn_prev = false;
+
+	bool btn_now = gpio_get(VCO_BUTTON);
+	if (btn_now && !btn_prev) {
 		if (state.vco_mode == VCO_SAW) state.vco_mode = VCO_SINE;
 		otherwise state.vco_mode++;  
 	}
@@ -18,4 +21,5 @@ void update_button(uint pin, bool *button_state) {
 void update_buttons() {
 	update_button(QUANT_BUTTON, &state.quant_enabled);
 	update_button(AMEN_BUTTON, &state.amen_enabled);
+	handle_vco_change();
 }

buttons.h

@@ -1,3 +1,7 @@
 #pragma once
 #include <pico/types.h>
+
 void handle_vco_change(uint gpio, uint32_t events);
+void update_button(uint pin, bool *button_state);
+void update_buttons();
+

main.cc

@@ -1,15 +1,21 @@
-#include "buttons.h"
-#include "macro.h"
-#include "pico/stdlib.h"
-#include <hardware/gpio.h>
-#include <math.h>
+#include <hardware/irq.h>
+#include <sys/types.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
-#include "const.h"
+#include <math.h>
+
+#include "hardware/gpio.h"
 #include "hardware/pwm.h"
 #include "hardware/adc.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;
 
@@ -20,8 +26,6 @@ void init_all() {
 	const uint8_t in_gpio[] = {VCO_BUTTON,QUANT_BUTTON,AMEN_BUTTON};
 	const uint8_t adc_gpio[] = {MUX0,MUX1};
 
-	gpio_set_function(AUDIO_OUT, GPIO_FUNC_PWM);
-
 	for (uint8_t i=0; i < ARRAY_LENGTH(out_gpio); i++) {
 		gpio_init(out_gpio[i]);
 		gpio_set_dir(out_gpio[i], true);
@@ -37,14 +41,33 @@ void init_all() {
 		adc_select_input(i);
 	}
 
-	gpio_pull_down(VCO_BUTTON);
-	gpio_set_irq_enabled_with_callback(VCO_BUTTON, GPIO_IRQ_EDGE_RISE, true, &handle_vco_change);
+	// 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();
+	}
 }
 
 __attribute__((noreturn))
 int main() {
 	init_all();
 
+	multicore_launch_core1(core1_main);
+
 	while (1) {}
 }
 

pwm.c

@@ -0,0 +1,21 @@
+#include <hardware/pwm.h>
+#include <pico/types.h>
+
+#include "const.h"
+
+#include "pwm.h"
+
+void pwm_isr(void) {
+	static uint slice = -1, chan = -1;
+	if (slice == -1) slice = pwm_gpio_to_slice_num(AUDIO_OUT);
+	if (chan == -1) chan = pwm_gpio_to_channel(AUDIO_OUT);
+
+	pwm_clear_irq(slice);
+
+	// TODO:
+	float sample = 0.0f;
+
+	uint16_t level = (uint16_t)((sample + 1.0f) * 0.5f * 3400.0f);
+	pwm_set_chan_level(slice, chan, level);
+}
+

pwm.h

@@ -0,0 +1,4 @@
+#pragma once
+
+void pwm_isr(void);
+