Initial commit

.gitignore

@@ -0,0 +1,5 @@
+build
+build.sh
+deps
+CMakeLists.txt
+pico_sdk_import.cmake

Readme.md

@@ -0,0 +1,40 @@
+# pico-button.c
+
+## Installation
+
+Install with [clib(1)](https://github.com/clibs/clib):
+
+```sh
+$ clib install jkroso/pico-button.c
+```
+
+## Api
+
+`create_button(pin, onchange)`: It will set the pin to pull up. It returns a `button_t` struct
+
+```c
+typedef struct button_t {
+  uint8_t pin;
+  bool state;
+  void (*onchange)(struct button_t *button);
+} button_t;
+```
+
+## Example
+
+```c
+#include "./deps/pico-button/button.c"
+
+void onchange(button_t *button_p) {
+  button_t *button = (button_t*)button_p;
+  printf("Button on pin %d changed state to %d\n", button->pin, button->state);
+}
+
+int main() {
+  stdio_init_all();
+  button_t *b = create_button(21, onchange);
+  printf("Button created and it's state is %d\n", b->state);
+  while (true) tight_loop_contents();
+  return 0;
+}
+```

button.c

@@ -0,0 +1,31 @@
+#include "./deps/pico-gpio-interrupt/gpio-interrupt.c"
+#include "pico/stdlib.h"
+#include "./button.h"
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+long long int handle_button_alarm(long int a, void *p) {
+  button_t *b = (button_t *)(p);
+  bool state = gpio_get(b->pin);
+  if (state != b->state) {
+    b->state = state;
+    b->onchange(b);
+  }
+  return 0;
+}
+
+void handle_button_interrupt(void *p) {
+  button_t *b = (button_t *)(p);
+  bool state = gpio_get(b->pin);
+  add_alarm_in_us(100, handle_button_alarm, b, true);
+}
+
+button_t * create_button(int pin, void (*onchange)(button_t *)) {
+  button_t *b = (button_t *)(malloc(sizeof(button_t)));
+  listen(pin, GPIO_IRQ_EDGE_RISE | GPIO_IRQ_EDGE_FALL, handle_button_interrupt, b);
+  b->pin = pin;
+  b->onchange = onchange;
+  b->state = gpio_get(pin);
+  return b;
+}

button.h

@@ -0,0 +1,15 @@
+#ifndef PICO_BUTTON_H
+#define PICO_BUTTON_H
+
+typedef struct button_t {
+  uint8_t pin;
+  bool state;
+  void (*onchange)(struct button_t *button);
+} button_t;
+
+long long int handle_button_alarm(long int a, void *p);
+void handle_button_interrupt(void *p);
+button_t * create_button(int pin, void (*onchange)(button_t *));
+
+
+#endif

clib.json

@@ -0,0 +1,15 @@
+{
+  "name": "pico-button",
+  "version": "0.1.0",
+  "repo": "jkroso/pico-button.c",
+  "description": "A debounced button struct for the Raspberry Pico",
+  "keywords": ["pico", "button"],
+  "license": "MIT",
+  "src": [
+    "button.h",
+    "button.c"
+  ],
+  "dependencies": {
+    "jkroso/pico-gpio-interrupt.c": "0.1.0"
+  }
+}

example.c

@@ -0,0 +1,18 @@
+#include "./deps/GPIO-Interrupt/GPIO-Interrupt.c"
+#include "./src/Button.c"
+#include "pico/stdlib.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+void onchange(button_t *button_p) {
+  button_t *button = (button_t*)button_p;
+  printf("Button on pin %d changed state to %d\n", button->pin, button->state);
+}
+
+int main() {
+  stdio_init_all();
+  button_t *b = create_button(21, onchange);
+  printf("Button created and it's state is %d\n", b->state);
+  while (true) tight_loop_contents();
+  return 0;
+}