Add USB MIDI support for SAMD and nRF.

The API should be identical to using a UART for MIDI.

Fixes #672

1 files changed, 107 insertions, 0 deletions

diff --git a/shared-bindings/usb_midi/PortOut.c b/shared-bindings/usb_midi/PortOut.c
new file mode 100644
index 000000000..156a092e0
--- /dev/null
+++ b/shared-bindings/usb_midi/PortOut.c
@@ -0,0 +1,107 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
+ *
+ * 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 <stdint.h>
+
+#include "shared-bindings/usb_midi/PortOut.h"
+#include "shared-bindings/util.h"
+
+#include "py/ioctl.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "py/stream.h"
+#include "supervisor/shared/translate.h"
+
+
+//| .. currentmodule:: usb_midi
+//|
+//| :class:`PortOut` -- sends midi messages to a computer over USB
+//| ==============================================================
+//|
+//| .. class:: PortOut()
+//|
+//|   Not currently dynamically supported.
+//|
+
+STATIC mp_obj_t usb_midi_portout_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *pos_args) {
+    return mp_const_none;
+}
+
+// These are standard stream methods. Code is in py/stream.c.
+//
+//|   .. method:: write(buf)
+//|
+//|     Write the buffer of bytes to the bus.
+//|
+//|     :return: the number of bytes written
+//|     :rtype: int or None
+//|
+
+STATIC mp_uint_t usb_midi_portout_write(mp_obj_t self_in, const void *buf_in, mp_uint_t size, int *errcode) {
+    usb_midi_portout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    const byte *buf = buf_in;
+
+    return common_hal_usb_midi_portout_write(self, buf, size, errcode);
+}
+
+STATIC mp_uint_t usb_midi_portout_ioctl(mp_obj_t self_in, mp_uint_t request, mp_uint_t arg, int *errcode) {
+    usb_midi_portout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    mp_uint_t ret;
+    if (request == MP_IOCTL_POLL) {
+        mp_uint_t flags = arg;
+        ret = 0;
+        if ((flags & MP_IOCTL_POLL_WR) && common_hal_usb_midi_portout_ready_to_tx(self)) {
+            ret |= MP_IOCTL_POLL_WR;
+        }
+    } else {
+        *errcode = MP_EINVAL;
+        ret = MP_STREAM_ERROR;
+    }
+    return ret;
+}
+
+STATIC const mp_rom_map_elem_t usb_midi_portout_locals_dict_table[] = {
+    // Standard stream methods.
+    { MP_OBJ_NEW_QSTR(MP_QSTR_write),    MP_ROM_PTR(&mp_stream_write_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(usb_midi_portout_locals_dict, usb_midi_portout_locals_dict_table);
+
+STATIC const mp_stream_p_t usb_midi_portout_stream_p = {
+    .read = NULL,
+    .write = usb_midi_portout_write,
+    .ioctl = usb_midi_portout_ioctl,
+    .is_text = false,
+};
+
+const mp_obj_type_t usb_midi_portout_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_PortOut,
+    .make_new = usb_midi_portout_make_new,
+    .getiter = mp_identity_getiter,
+    .iternext = mp_stream_unbuffered_iter,
+    .protocol = &usb_midi_portout_stream_p,
+    .locals_dict = (mp_obj_dict_t*)&usb_midi_portout_locals_dict,
+};