4 files changed, 226 insertions, 0 deletions
diff --git a/shared-bindings/countio/Counter.c b/shared-bindings/countio/Counter.c
new file mode 100644
index 000000000..d9d97f0ea
--- /dev/null
+++ b/shared-bindings/countio/Counter.c
@@ -0,0 +1,151 @@
+
+#include <stdint.h>
+
+#include "lib/utils/context_manager_helpers.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "py/runtime0.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/countio/Counter.h"
+#include "shared-bindings/util.h"
+
+//| .. currentmodule:: countio
+//|
+//| :class:`Counter` -- Track the count of falling edge transistions (pulses) on a given pin
+//| ========================================================================================
+//|
+//| Counter will keep track of the number of falling edge transistions (pulses) on a given pin
+//|
+//| .. class:: Counter(pin_a)
+//|
+//|   Create a Counter object associated with the given pin. It tracks the number of 
+//|   falling pulses relative when the object is constructed.
+//|
+//|   :param ~microcontroller.Pin pin_a: Pin to read pulses from.
+//|   
+//|
+//|   For example::
+//|
+//|     import countio
+//|     import time
+//|     from board import *
+//|
+//|     pin_counter = countio.Counter(board.D1)
+//|     #reset the count after 100 counts
+//|     while True:
+//|         if pin_counter.count == 100:
+//|             pin_counter.reset()
+//|         print(pin_counter.count)
+//|
+STATIC mp_obj_t countio_counter_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_pin_a };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_pin_a, MP_ARG_REQUIRED | MP_ARG_OBJ }
+        
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    const mcu_pin_obj_t* pin_a = validate_obj_is_free_pin(args[ARG_pin_a].u_obj);
+    
+
+    countio_counter_obj_t *self = m_new_obj(countio_counter_obj_t);
+    self->base.type = &countio_counter_type;
+
+    common_hal_countio_counter_construct(self, pin_a);
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|   .. method:: deinit()
+//|
+//|      Deinitializes the Counter and releases any hardware resources for reuse.
+//|
+STATIC mp_obj_t countio_counter_deinit(mp_obj_t self_in) {
+    countio_counter_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_countio_counter_deinit(self);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(countio_counter_deinit_obj, countio_counter_deinit);
+
+STATIC void check_for_deinit(countio_counter_obj_t *self) {
+    if (common_hal_countio_counter_deinited(self)) {
+        raise_deinited_error();
+    }
+}
+
+//|   .. method:: __enter__()
+//|
+//|      No-op used by Context Managers.
+//|
+//  Provided by context manager helper.
+
+//|   .. method:: __exit__()
+//|
+//|      Automatically deinitializes the hardware when exiting a context. See
+//|      :ref:`lifetime-and-contextmanagers` for more info.
+//|
+STATIC mp_obj_t countio_counter_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_countio_counter_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(countio_counter___exit___obj, 4, 4, countio_counter_obj___exit__);
+
+
+//|   .. attribute:: count
+//|
+//|     The current count in terms of pulses.
+//|
+//|
+STATIC mp_obj_t countio_counter_obj_get_count(mp_obj_t self_in) {
+    countio_counter_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+
+    return mp_obj_new_int(common_hal_countio_counter_get_count(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(countio_counter_get_count_obj, countio_counter_obj_get_count);
+
+STATIC mp_obj_t countio_counter_obj_set_count(mp_obj_t self_in, mp_obj_t new_count) {
+    countio_counter_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+
+    common_hal_countio_counter_set_count(self, mp_obj_get_int(new_count));
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(countio_counter_set_count_obj, countio_counter_obj_set_count);
+
+const mp_obj_property_t countio_counter_count_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&countio_counter_get_count_obj,
+              (mp_obj_t)&countio_counter_set_count_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+STATIC mp_obj_t countio_counter_reset(mp_obj_t self_in){
+	countio_counter_obj_t *self = MP_OBJ_TO_PTR(self_in);
+	check_for_deinit(self);
+	//set the position to zero for reset
+	common_hal_countio_counter_reset(self);
+	return mp_const_none;
+}
+	
+
+MP_DEFINE_CONST_FUN_OBJ_1(countio_counter_reset_obj, countio_counter_reset);
+
+STATIC const mp_rom_map_elem_t countio_counter_locals_dict_table[] = {
+    // Methods
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&countio_counter_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&countio_counter___exit___obj) },
+    { MP_ROM_QSTR(MP_QSTR_count), MP_ROM_PTR(&countio_counter_count_obj) },
+    { MP_ROM_QSTR(MP_QSTR_reset), MP_ROM_PTR(&countio_counter_reset_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(countio_counter_locals_dict, countio_counter_locals_dict_table);
+
+const mp_obj_type_t countio_counter_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Counter,
+    .make_new = countio_counter_make_new,
+    .locals_dict = (mp_obj_dict_t*)&countio_counter_locals_dict,
+};
diff --git a/shared-bindings/countio/Counter.h b/shared-bindings/countio/Counter.h
new file mode 100644
index 000000000..15adbbe2a
--- /dev/null
+++ b/shared-bindings/countio/Counter.h
@@ -0,0 +1,18 @@
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_COUNTIO_COUNTER_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_COUNTIO_COUNTER_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/countio/Counter.h"
+
+extern const mp_obj_type_t countio_counter_type;
+
+extern void common_hal_countio_counter_construct(countio_counter_obj_t* self,
+    const mcu_pin_obj_t* pin_a);
+extern void common_hal_countio_counter_deinit(countio_counter_obj_t* self);
+extern bool common_hal_countio_counter_deinited(countio_counter_obj_t* self);
+extern mp_int_t common_hal_countio_counter_get_count(countio_counter_obj_t* self);
+extern void common_hal_countio_counter_set_count(countio_counter_obj_t* self,
+    mp_int_t new_count);
+extern void common_hal_countio_counter_reset(countio_counter_obj_t* self);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_COUNTIO_COUNTER_H
diff --git a/shared-bindings/countio/__init__.c b/shared-bindings/countio/__init__.c
new file mode 100644
index 000000000..8929bf7ed
--- /dev/null
+++ b/shared-bindings/countio/__init__.c
@@ -0,0 +1,48 @@
+
+#include <stdint.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/countio/__init__.h"
+#include "shared-bindings/countio/Counter.h"
+
+//| :mod:`countio` --- Support for edge counting
+//| ========================================================
+//|
+//| .. module:: countio
+//|   :synopsis: Support for edge counting
+//|   :platform: SAMD
+//|
+//| The `countio` module contains logic to read and count edge transistions
+//|
+//| Libraries
+//|
+//| .. toctree::
+//|     :maxdepth: 3
+//|
+//|     Counter
+//|
+
+//| .. warning:: This module is not available in some SAMD21 (aka M0) builds. See the
+//|   :ref:`module-support-matrix` for more info.
+//|
+
+//| All classes change hardware state and should be deinitialized when they
+//| are no longer needed if the program continues after use. To do so, either
+//| call :py:meth:`!deinit` or use a context manager. See
+//| :ref:`lifetime-and-contextmanagers` for more info.
+//|
+
+STATIC const mp_rom_map_elem_t countio_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_countio) },
+    { MP_ROM_QSTR(MP_QSTR_Counter), MP_ROM_PTR(&countio_counter_type) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(countio_module_globals, countio_module_globals_table);
+
+const mp_obj_module_t countio_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t*)&countio_module_globals,
+};
diff --git a/shared-bindings/countio/__init__.h b/shared-bindings/countio/__init__.h
new file mode 100644
index 000000000..35ae9f035
--- /dev/null
+++ b/shared-bindings/countio/__init__.h
@@ -0,0 +1,9 @@
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_COUNTIO___INIT___H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_COUNTIO___INIT___H
+
+#include "py/obj.h"
+
+// Nothing now.
+
+#endif  // MICROPY_INCLUDED_SHARED_BINDINGS_COUNTIO___INIT___H