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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Dan Halbert for Adafruit Industries
* Copyright (c) 2018 Artur Pacholec
* Copyright (c) 2016 Glenn Ruben Bakke
*
* 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 "py/runtime.h"
#include "shared-bindings/bleio/__init__.h"
#include "shared-bindings/bleio/Descriptor.h"
#include "shared-bindings/bleio/Service.h"
#include "shared-bindings/bleio/UUID.h"
static volatile bleio_descriptor_obj_t *m_read_descriptor;
void common_hal_bleio_descriptor_construct(bleio_descriptor_obj_t *self, 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) {
self->characteristic = MP_OBJ_NULL;
self->uuid = uuid;
self->handle = BLE_GATT_HANDLE_INVALID;
self->read_perm = read_perm;
self->write_perm = write_perm;
const mp_int_t max_length_max = fixed_length ? BLE_GATTS_FIX_ATTR_LEN_MAX : BLE_GATTS_VAR_ATTR_LEN_MAX;
if (max_length < 0 || max_length > max_length_max) {
mp_raise_ValueError_varg(translate("max_length must be 0-%d when fixed_length is %s"),
max_length_max, fixed_length ? "True" : "False");
}
self->max_length = max_length;
self->fixed_length = fixed_length;
common_hal_bleio_descriptor_set_value(self, initial_value_bufinfo);
}
bleio_uuid_obj_t *common_hal_bleio_descriptor_get_uuid(bleio_descriptor_obj_t *self) {
return self->uuid;
}
bleio_characteristic_obj_t *common_hal_bleio_descriptor_get_characteristic(bleio_descriptor_obj_t *self) {
return self->characteristic;
}
STATIC void descriptor_on_gattc_read_rsp_evt(ble_evt_t *ble_evt, void *param) {
switch (ble_evt->header.evt_id) {
// More events may be handled later, so keep this as a switch.
case BLE_GATTC_EVT_READ_RSP: {
ble_gattc_evt_read_rsp_t *response = &ble_evt->evt.gattc_evt.params.read_rsp;
if (m_read_descriptor) {
m_read_descriptor->value = mp_obj_new_bytearray(response->len, response->data);
}
// Indicate to busy-wait loop that we've read the attribute value.
m_read_descriptor = NULL;
break;
}
default:
// For debugging.
// mp_printf(&mp_plat_print, "Unhandled descriptor event: 0x%04x\n", ble_evt->header.evt_id);
break;
}
}
STATIC void descriptor_gattc_read(bleio_descriptor_obj_t *descriptor) {
const uint16_t conn_handle =
common_hal_bleio_device_get_conn_handle(descriptor->characteristic->service->device);
common_hal_bleio_check_connected(conn_handle);
// Set to NULL in event loop after event.
m_read_descriptor = descriptor;
ble_drv_add_event_handler(descriptor_on_gattc_read_rsp_evt, descriptor);
const uint32_t err_code = sd_ble_gattc_read(conn_handle, descriptor->handle, 0);
if (err_code != NRF_SUCCESS) {
mp_raise_OSError_msg_varg(translate("Failed to read attribute value, err 0x%04x"), err_code);
}
while (m_read_descriptor != NULL) {
MICROPY_VM_HOOK_LOOP;
}
ble_drv_remove_event_handler(descriptor_on_gattc_read_rsp_evt, descriptor);
}
mp_obj_t common_hal_bleio_descriptor_get_value(bleio_descriptor_obj_t *self) {
// Do GATT operations only if this descriptor has been registered
if (self->handle != BLE_GATT_HANDLE_INVALID) {
if (common_hal_bleio_service_get_is_remote(self->characteristic->service)) {
descriptor_gattc_read(self);
} else {
self->value = common_hal_bleio_gatts_read(
self->handle, common_hal_bleio_device_get_conn_handle(self->characteristic->service->device));
}
}
return self->value;
}
void common_hal_bleio_descriptor_set_value(bleio_descriptor_obj_t *self, mp_buffer_info_t *bufinfo) {
if (self->fixed_length && bufinfo->len != self->max_length) {
mp_raise_ValueError(translate("Value length != required fixed length"));
}
if (bufinfo->len > self->max_length) {
mp_raise_ValueError(translate("Value length > max_length"));
}
self->value = mp_obj_new_bytes(bufinfo->buf, bufinfo->len);
// Do GATT operations only if this descriptor has been registered.
if (self->handle != BLE_GATT_HANDLE_INVALID) {
uint16_t conn_handle = common_hal_bleio_device_get_conn_handle(self->characteristic->service->device);
if (common_hal_bleio_service_get_is_remote(self->characteristic->service)) {
// false means WRITE_REQ, not write-no-response
common_hal_bleio_gattc_write(self->handle, conn_handle, bufinfo, false);
} else {
common_hal_bleio_gatts_write(self->handle, conn_handle, bufinfo);
}
}
}
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