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/*
* local_control.c
* Code related to the local control mode
*
* Created on: Nov 4, 2025
* Author: sowgro
*/
#include <player.h>
#include <stm32l4xx.h>
#include <stdio.h>
#include <stdint.h>
#include "GPIO.h"
#include "project.h"
#include "systick.h"
static int click_count = 0;
static uint32_t last_press = 0;
static int hold_pending = 0;
void handle_press(int pressed);
/**
* Initialize local control mode (does not enable it)
*/
void local_control_init() {
GPIO_Init();
NVIC_EnableIRQ(EXTI9_5_IRQn);
}
/**
* Logic that should be called constantly from the main loop.
*/
void local_control_loop() {
uint32_t now = systick_get_count();
if (hold_pending) {
hold_pending = 0;
player_stop();
}
if (last_press && now - last_press > 1000000) {
last_press = 0;
switch(click_count) {
case 1:
if (player_get_state() == PLAYING_STATE) {
player_pause();
} else {
player_play();
}
break;
case 2:
player_next(); break;
}
click_count = 0;
}
}
/**
* Handles external button press
*/
void EXTI9_5_IRQHandler() {
static int prevStatus = -1;
if (~EXTI->PR1 & EXTI_PR1_PIF9)
return;
EXTI->PR1 |= EXTI_PR1_PIF9;
if (project_get_mode() != LOCAL_MODE)
return;
int status = !!(GPIOA->IDR & GPIO_PIN_9);
if (prevStatus == status) // prevent bounce
return;
prevStatus = status;
handle_press(status);
}
/**
* Logs button information
* @param pressed 1 if the button was just pressed, 0 if the button was just released
*/
void handle_press(int pressed) {
static uint32_t time_down = 0;
uint32_t now = systick_get_count();
if (pressed) {
time_down = now;
} else {
putchar(0); // I don't know why but without this it still bounces sometimes
if ((now - time_down) < 1000000) {
time_down = 0;
last_press = now;
click_count++;
} else {
hold_pending = 1;
time_down = 0;
}
}
}
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