1 files changed, 105 insertions, 0 deletions
diff --git a/circuitpython/devices/ble_hci/common-hal/_bleio/CharacteristicBuffer.c b/circuitpython/devices/ble_hci/common-hal/_bleio/CharacteristicBuffer.c
new file mode 100644
index 0000000..0d87f03
--- /dev/null
+++ b/circuitpython/devices/ble_hci/common-hal/_bleio/CharacteristicBuffer.c
@@ -0,0 +1,105 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Dan Halbert 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 <string.h>
+#include <stdio.h>
+
+#include "shared/runtime/interrupt_char.h"
+#include "py/runtime.h"
+#include "py/stream.h"
+
+#include "shared-bindings/_bleio/__init__.h"
+#include "shared-bindings/_bleio/Connection.h"
+#include "shared-bindings/_bleio/CharacteristicBuffer.h"
+#include "supervisor/shared/tick.h"
+#include "common-hal/_bleio/CharacteristicBuffer.h"
+
+// Push all the data onto the ring buffer. When the buffer is full, new bytes will be dropped.
+STATIC void write_to_ringbuf(bleio_characteristic_buffer_obj_t *self, uint8_t *data, uint16_t len) {
+    ringbuf_put_n(&self->ringbuf, data, len);
+}
+
+void bleio_characteristic_buffer_update(bleio_characteristic_buffer_obj_t *self, mp_buffer_info_t *bufinfo) {
+    write_to_ringbuf(self, bufinfo->buf, bufinfo->len);
+}
+
+// Assumes that timeout and buffer_size have been validated before call.
+void common_hal_bleio_characteristic_buffer_construct(bleio_characteristic_buffer_obj_t *self,
+    bleio_characteristic_obj_t *characteristic,
+    mp_float_t timeout,
+    size_t buffer_size) {
+
+    self->characteristic = characteristic;
+    self->timeout_ms = timeout * 1000;
+    // This is a macro.
+    // true means long-lived, so it won't be moved.
+    ringbuf_alloc(&self->ringbuf, buffer_size, true);
+
+    bleio_characteristic_set_observer(characteristic, self);
+}
+
+uint32_t common_hal_bleio_characteristic_buffer_read(bleio_characteristic_buffer_obj_t *self, uint8_t *data, size_t len, int *errcode) {
+    uint64_t start_ticks = supervisor_ticks_ms64();
+
+    // Wait for all bytes received or timeout
+    while ((ringbuf_num_filled(&self->ringbuf) < len) && (supervisor_ticks_ms64() - start_ticks < self->timeout_ms)) {
+        RUN_BACKGROUND_TASKS;
+        // Allow user to break out of a timeout with a KeyboardInterrupt.
+        if (mp_hal_is_interrupted()) {
+            return 0;
+        }
+    }
+
+    uint32_t num_bytes_read = ringbuf_get_n(&self->ringbuf, data, len);
+    return num_bytes_read;
+}
+
+uint32_t common_hal_bleio_characteristic_buffer_rx_characters_available(bleio_characteristic_buffer_obj_t *self) {
+    uint16_t count = ringbuf_num_filled(&self->ringbuf);
+    return count;
+}
+
+void common_hal_bleio_characteristic_buffer_clear_rx_buffer(bleio_characteristic_buffer_obj_t *self) {
+    ringbuf_clear(&self->ringbuf);
+}
+
+bool common_hal_bleio_characteristic_buffer_deinited(bleio_characteristic_buffer_obj_t *self) {
+    return self->characteristic == NULL;
+}
+
+void common_hal_bleio_characteristic_buffer_deinit(bleio_characteristic_buffer_obj_t *self) {
+    if (!common_hal_bleio_characteristic_buffer_deinited(self)) {
+        bleio_characteristic_clear_observer(self->characteristic);
+    }
+}
+
+bool common_hal_bleio_characteristic_buffer_connected(bleio_characteristic_buffer_obj_t *self) {
+    return self->characteristic != NULL &&
+           self->characteristic->service != NULL &&
+           (!self->characteristic->service->is_remote ||
+               (self->characteristic->service->connection != MP_OBJ_NULL &&
+                   common_hal_bleio_connection_get_connected(self->characteristic->service->connection)));
+}