From 404097a13d113282362c8991fe3e7001a19943e3 Mon Sep 17 00:00:00 2001
From: Fabian Montero <fabian@posixlycorrect.com>
Date: Mon, 11 Sep 2023 03:33:57 -0600
Subject: [PATCH] fixes wait_for_button_press function, WIP

---
 pin_control/pin_control.c | 56 +++++++++++++++++++--------------------
 1 file changed, 28 insertions(+), 28 deletions(-)

diff --git a/pin_control/pin_control.c b/pin_control/pin_control.c
index acf604d..b5d5cd9 100644
--- a/pin_control/pin_control.c
+++ b/pin_control/pin_control.c
@@ -1,6 +1,8 @@
 #include <stdio.h>
 #include <gpiod.h>
 
+// https://docs.kernel.org/driver-api/gpio/using-gpio.html
+
 #define GPIO_CHIP "gpiochip0"
 
 struct gpiod_chip *chip;
@@ -47,27 +49,6 @@ int set_pin_state(int pin, int state) {
     return 0;
 }
 
-int read_button(int pin) {
-    // https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_chip_get_line.html
-    struct gpiod_line *line = gpiod_chip_get_line(chip, pin + PIN_OFFSET);
-    if (!line) {
-        printf("Error getting GPIO line");
-        return -1;
-    }
-
-    // https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_line_request_input.html
-    if (gpiod_line_request_input(line, "house-leds") < 0) {
-        printf("Error setting GPIO line direction to input");
-        gpiod_line_release(line);
-        return -1;
-    }
-
-    // https://libgpiod-dlang.dpldocs.info/gpiod.gpiod_line_get_value.html
-    int value = gpiod_line_get_value(line);
-    gpiod_line_release(line);
-    return value; // either 0 or 1
-}
-
 int turn_on_pin(int pin) {
     return set_pin_state(pin, 1);
 }
@@ -92,11 +73,30 @@ int turn_off_all_pins() {
     return 0;
 }
 
-int wait_for_button_press(int button_pin) {
-    while (1) {
-        int button_state = read_button(button_pin); // maybe make it so that this works with a range of pins instead of just one
-        if (button_state == 1) {
-            return button_pin;
-        }
-    }
+int button_presssed(int event, unsigned int pin, const struct timespec * timestamp, void *data) {
+    * (int *) data = (int) pin;
+    return GPIOD_CTXLESS_EVENT_POLL_RET_STOP;
+}
+
+int wait_for_button_press(unsigned int pins[]) {
+    // https://www.lane-fu.com/linuxmirror/libgpiod/doc/html/group______high__level____.html#ga3ac28eb59bbd31b8b2298f76047d377d
+    
+    int pressed_pin = -1;
+
+    struct timespec {
+        time_t  3600;  /* Seconds */
+        long    0; /* Nanoseconds */
+    } ts;
+    
+    gpiod_ctxless_event_monitor_multiple(chip,
+                                        GPIOD_CTXLESS_EVENT_FALLING_EDGE,
+                                        pins,
+                                        5,
+                                        true,
+                                        "house-leds",
+                                        ts,     // big timout
+                                        NULL,
+                                        button_presssed,
+                                        &pressed_pin
+                                        )
 }