atmel-samd: Basic capacitive touch button support.

Currently only works on a single channel and is only enabled for boards with
SPI flash. Only really designed for hardware testing at this point.

3 files changed, 182 insertions, 0 deletions

diff --git a/shared-bindings/nativeio/TouchIn.c b/shared-bindings/nativeio/TouchIn.c
new file mode 100644
index 000000000..478fec6cd
--- /dev/null
+++ b/shared-bindings/nativeio/TouchIn.c
@@ -0,0 +1,141 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <string.h>
+
+#include "py/binary.h"
+#include "py/mphal.h"
+#include "py/nlr.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/nativeio/TouchIn.h"
+
+//| .. currentmodule:: nativeio
+//|
+//| :class:`TouchIn` -- Read the state of a capacitive touch sensor
+//| ============================================
+//|
+//| Usage::
+//|
+//|    import nativeio
+//|    from board import *
+//|
+//|    with nativeio.TouchIn(A1) as touch:
+//|      if touch.value:
+//|        print("touched!")
+//|
+
+//| .. class:: TouchIn(pin)
+//|
+//|   Use the TouchIn on the given pin.
+//|
+//|   :param ~microcontroller.Pin pin: the pin to read from
+//|
+STATIC mp_obj_t nativeio_touchin_make_new(const mp_obj_type_t *type,
+        mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
+    // check number of arguments
+    mp_arg_check_num(n_args, n_kw, 1, 1, false);
+
+    // 1st argument is the pin
+    mp_obj_t pin_obj = args[0];
+    assert_pin(pin_obj, false);
+
+    nativeio_touchin_obj_t *self = m_new_obj(nativeio_touchin_obj_t);
+    self->base.type = &nativeio_touchin_type;
+    const mcu_pin_obj_t *pin = MP_OBJ_TO_PTR(pin_obj);
+    common_hal_nativeio_touchin_construct(self, pin);
+
+    return (mp_obj_t) self;
+}
+
+//|   .. method:: deinit()
+//|
+//|      Deinitialises the TouchIn and releases any hardware resources for reuse.
+//|
+STATIC mp_obj_t nativeio_touchin_deinit(mp_obj_t self_in) {
+    nativeio_touchin_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_nativeio_touchin_deinit(self);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(nativeio_touchin_deinit_obj, nativeio_touchin_deinit);
+
+//|   .. method:: __enter__()
+//|
+//|      No-op used by Context Managers.
+//|
+STATIC mp_obj_t nativeio_touchin_obj___enter__(mp_obj_t self_in) {
+   return self_in;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(nativeio_touchin___enter___obj, nativeio_touchin_obj___enter__);
+
+//|   .. method:: __exit__()
+//|
+//|      Automatically deinitializes the hardware when exiting a context.
+//|
+STATIC mp_obj_t nativeio_touchin_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_nativeio_touchin_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(nativeio_touchin___exit___obj, 4, 4, nativeio_touchin_obj___exit__);
+
+//|   .. attribute:: value
+//|
+//|     Whether the touch pad is being touched or not.
+//|
+//|     :return: True when touched, False otherwise.
+//|     :rtype: bool
+//|
+STATIC mp_obj_t nativeio_touchin_obj_get_value(mp_obj_t self_in) {
+   nativeio_touchin_obj_t *self = MP_OBJ_TO_PTR(self_in);
+   return mp_obj_new_bool(common_hal_nativeio_touchin_get_value(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(nativeio_touchin_get_value_obj, nativeio_touchin_obj_get_value);
+
+mp_obj_property_t nativeio_touchin_value_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&nativeio_touchin_get_value_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+STATIC const mp_rom_map_elem_t nativeio_touchin_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&nativeio_touchin___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&nativeio_touchin___exit___obj) },
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&nativeio_touchin_deinit_obj) },
+
+    { MP_OBJ_NEW_QSTR(MP_QSTR_value), MP_ROM_PTR(&nativeio_touchin_value_obj)},
+};
+
+STATIC MP_DEFINE_CONST_DICT(nativeio_touchin_locals_dict, nativeio_touchin_locals_dict_table);
+
+const mp_obj_type_t nativeio_touchin_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_TouchIn,
+    .make_new = nativeio_touchin_make_new,
+    .locals_dict = (mp_obj_t)&nativeio_touchin_locals_dict,
+};
diff --git a/shared-bindings/nativeio/TouchIn.h b/shared-bindings/nativeio/TouchIn.h
new file mode 100644
index 000000000..b22f655e5
--- /dev/null
+++ b/shared-bindings/nativeio/TouchIn.h
@@ -0,0 +1,39 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef __MICROPY_INCLUDED_SHARED_BINDINGS_NATIVEIO_TOUCHIN_H__
+#define __MICROPY_INCLUDED_SHARED_BINDINGS_NATIVEIO_TOUCHIN_H__
+
+#include "common-hal/microcontroller/types.h"
+#include "common-hal/nativeio/types.h"
+
+extern const mp_obj_type_t nativeio_touchin_type;
+
+void common_hal_nativeio_touchin_construct(nativeio_touchin_obj_t* self, const mcu_pin_obj_t *pin);
+void common_hal_nativeio_touchin_deinit(nativeio_touchin_obj_t* self);
+bool common_hal_nativeio_touchin_get_value(nativeio_touchin_obj_t *self);
+
+#endif  // __MICROPY_INCLUDED_SHARED_BINDINGS_NATIVEIO_TOUCHIN_H__
diff --git a/shared-bindings/nativeio/__init__.c b/shared-bindings/nativeio/__init__.c
index 46187a34a..0cf4ec829 100644
--- a/shared-bindings/nativeio/__init__.c
+++ b/shared-bindings/nativeio/__init__.c
@@ -41,6 +41,7 @@
 #include "shared-bindings/nativeio/I2C.h"
 #include "shared-bindings/nativeio/PWMOut.h"
 #include "shared-bindings/nativeio/SPI.h"
+#include "shared-bindings/nativeio/TouchIn.h"
 #include "common-hal/nativeio/types.h"
 #include "shared-bindings/nativeio/__init__.h"
 
@@ -114,6 +115,7 @@ STATIC const mp_rom_map_elem_t nativeio_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_I2C),   MP_ROM_PTR(&nativeio_i2c_type) },
     { MP_ROM_QSTR(MP_QSTR_PWMOut), MP_ROM_PTR(&nativeio_pwmout_type) },
     { MP_ROM_QSTR(MP_QSTR_SPI),   MP_ROM_PTR(&nativeio_spi_type) },
+    { MP_ROM_QSTR(MP_QSTR_TouchIn),   MP_ROM_PTR(&nativeio_touchin_type) },
 };
 
 STATIC MP_DEFINE_CONST_DICT(nativeio_module_globals, nativeio_module_globals_table);