94 lines
4 KiB
C
94 lines
4 KiB
C
// This file is part of the CircuitPython project: https://circuitpython.org
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//
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// SPDX-FileCopyrightText: Copyright (c) 2019 Dan Halbert for Adafruit Industries
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// SPDX-FileCopyrightText: Copyright (c) 2018 Artur Pacholec
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// SPDX-FileCopyrightText: Copyright (c) 2016 Glenn Ruben Bakke
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//
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// SPDX-License-Identifier: MIT
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#include "py/runtime.h"
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#include "shared-bindings/_bleio/__init__.h"
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#include "shared-bindings/_bleio/Descriptor.h"
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#include "shared-bindings/_bleio/Service.h"
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#include "shared-bindings/_bleio/UUID.h"
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void common_hal_bleio_descriptor_construct(bleio_descriptor_obj_t *self, bleio_characteristic_obj_t *characteristic, bleio_uuid_obj_t *uuid, bleio_attribute_security_mode_t read_perm, bleio_attribute_security_mode_t write_perm, mp_int_t max_length, bool fixed_length, mp_buffer_info_t *initial_value_bufinfo) {
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self->characteristic = characteristic;
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self->uuid = uuid;
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self->handle = BLE_GATT_HANDLE_INVALID;
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self->read_perm = read_perm;
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self->write_perm = write_perm;
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self->value = mp_obj_new_bytes(initial_value_bufinfo->buf, initial_value_bufinfo->len);
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const mp_int_t max_length_max = fixed_length ? BLE_GATTS_FIX_ATTR_LEN_MAX : BLE_GATTS_VAR_ATTR_LEN_MAX;
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if (max_length < 0 || max_length > max_length_max) {
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mp_raise_ValueError_varg(MP_ERROR_TEXT("max_length must be 0-%d when fixed_length is %s"),
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max_length_max, fixed_length ? "True" : "False");
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}
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self->max_length = max_length;
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self->fixed_length = fixed_length;
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common_hal_bleio_descriptor_set_value(self, initial_value_bufinfo);
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}
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bleio_uuid_obj_t *common_hal_bleio_descriptor_get_uuid(bleio_descriptor_obj_t *self) {
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return self->uuid;
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}
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bleio_characteristic_obj_t *common_hal_bleio_descriptor_get_characteristic(bleio_descriptor_obj_t *self) {
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return self->characteristic;
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}
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size_t common_hal_bleio_descriptor_get_value(bleio_descriptor_obj_t *self, uint8_t *buf, size_t len) {
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// Do GATT operations only if this descriptor has been registered
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if (self->handle != BLE_GATT_HANDLE_INVALID) {
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if (common_hal_bleio_service_get_is_remote(self->characteristic->service)) {
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// uint16_t conn_handle = bleio_connection_get_conn_handle(self->characteristic->service->connection);
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// FIX have att_read_req fill in a buffer
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// uint8_t rsp[MAX(len, 512)];
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// return att_read_req(conn_handle, self->handle, rsp, len);
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return 0;
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} else {
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mp_buffer_info_t bufinfo;
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if (!mp_get_buffer(self->value, &bufinfo, MP_BUFFER_READ)) {
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return 0;
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}
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const size_t actual_length = MIN(len, bufinfo.len);
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memcpy(buf, bufinfo.buf, actual_length);
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return actual_length;
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}
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}
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return 0;
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}
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void common_hal_bleio_descriptor_set_value(bleio_descriptor_obj_t *self, mp_buffer_info_t *bufinfo) {
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if (self->fixed_length && bufinfo->len != self->max_length) {
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mp_raise_ValueError(MP_ERROR_TEXT("Value length != required fixed length"));
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}
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if (bufinfo->len > self->max_length) {
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mp_raise_ValueError(MP_ERROR_TEXT("Value length > max_length"));
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}
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self->value = mp_obj_new_bytes(bufinfo->buf, bufinfo->len);
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// Do GATT operations only if this descriptor has been registered.
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if (self->handle != BLE_GATT_HANDLE_INVALID) {
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if (common_hal_bleio_service_get_is_remote(self->characteristic->service)) {
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// FIX
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// uint16_t conn_handle = bleio_connection_get_conn_handle(self->service->connection);
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// att_write_req(conn_handle, self->handle, bufinfo->buf, bufinfo->len, rsp);
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} else {
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// Always write the value locally even if no connections are active.
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if (self->fixed_length && bufinfo->len != self->max_length) {
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return;
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}
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if (bufinfo->len > self->max_length) {
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return;
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}
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self->value = mp_obj_new_bytes(bufinfo->buf, bufinfo->len);
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}
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}
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}
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