136 lines
5.2 KiB
C
136 lines
5.2 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Dan Halbert for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include <stdio.h>
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#include "ble_drv.h"
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#include "ble_gatts.h"
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#include "sd_mutex.h"
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#include "lib/utils/interrupt_char.h"
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "tick.h"
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#include "common-hal/bleio/__init__.h"
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#include "common-hal/bleio/CharacteristicBuffer.h"
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STATIC void characteristic_buffer_on_ble_evt(ble_evt_t *ble_evt, void *param) {
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bleio_characteristic_buffer_obj_t *self = (bleio_characteristic_buffer_obj_t *) param;
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switch (ble_evt->header.evt_id) {
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case BLE_GATTS_EVT_WRITE: {
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ble_gatts_evt_write_t *evt_write = &ble_evt->evt.gatts_evt.params.write;
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// Event handle must match the handle for my characteristic.
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if (evt_write->handle == self->characteristic->handle) {
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// Push all the data onto the ring buffer, but wait for any reads to finish.
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sd_mutex_acquire_wait_no_vm(&self->ringbuf_mutex);
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for (size_t i = 0; i < evt_write->len; i++) {
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ringbuf_put(&self->ringbuf, evt_write->data[i]);
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}
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// Don't check for errors: we're in an event handler.
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sd_mutex_release(&self->ringbuf_mutex);
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break;
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}
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}
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}
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}
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// Assumes that timeout and buffer_size have been validated before call.
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void common_hal_bleio_characteristic_buffer_construct(bleio_characteristic_buffer_obj_t *self,
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bleio_characteristic_obj_t *characteristic,
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mp_float_t timeout,
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size_t buffer_size) {
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self->characteristic = characteristic;
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self->timeout_ms = timeout * 1000;
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// This is a macro.
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// true means long-lived, so it won't be moved.
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ringbuf_alloc(&self->ringbuf, buffer_size, true);
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sd_mutex_new(&self->ringbuf_mutex);
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ble_drv_add_event_handler(characteristic_buffer_on_ble_evt, self);
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}
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int common_hal_bleio_characteristic_buffer_read(bleio_characteristic_buffer_obj_t *self, uint8_t *data, size_t len, int *errcode) {
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uint64_t start_ticks = ticks_ms;
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// Wait for all bytes received or timeout
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while ( (ringbuf_count(&self->ringbuf) < len) && (ticks_ms - start_ticks < self->timeout_ms) ) {
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#ifdef MICROPY_VM_HOOK_LOOP
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MICROPY_VM_HOOK_LOOP ;
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// Allow user to break out of a timeout with a KeyboardInterrupt.
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if ( mp_hal_is_interrupted() ) {
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return 0;
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}
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#endif
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}
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// Copy received data. Lock out writes while copying.
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sd_mutex_acquire_wait(&self->ringbuf_mutex);
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size_t rx_bytes = MIN(ringbuf_count(&self->ringbuf), len);
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for ( size_t i = 0; i < rx_bytes; i++ ) {
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data[i] = ringbuf_get(&self->ringbuf);
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}
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// Writes now OK.
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sd_mutex_release_check(&self->ringbuf_mutex);
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return rx_bytes;
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}
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uint32_t common_hal_bleio_characteristic_buffer_rx_characters_available(bleio_characteristic_buffer_obj_t *self) {
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return ringbuf_count(&self->ringbuf);
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}
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void common_hal_bleio_characteristic_buffer_clear_rx_buffer(bleio_characteristic_buffer_obj_t *self) {
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// prevent conflict with uart irq
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sd_mutex_acquire_wait(&self->ringbuf_mutex);
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ringbuf_clear(&self->ringbuf);
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sd_mutex_release_check(&self->ringbuf_mutex);
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}
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bool common_hal_bleio_characteristic_buffer_deinited(bleio_characteristic_buffer_obj_t *self) {
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return self->characteristic == NULL;
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}
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void common_hal_bleio_characteristic_buffer_deinit(bleio_characteristic_buffer_obj_t *self) {
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if (!common_hal_bleio_characteristic_buffer_deinited(self)) {
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ble_drv_remove_event_handler(characteristic_buffer_on_ble_evt, self);
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}
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}
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bool common_hal_bleio_characteristic_buffer_connected(bleio_characteristic_buffer_obj_t *self) {
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return self->characteristic != NULL &&
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self->characteristic->service != NULL &&
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self->characteristic->service->device != NULL &&
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common_hal_bleio_device_get_conn_handle(self->characteristic->service->device) != BLE_CONN_HANDLE_INVALID;
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}
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