271 lines
13 KiB
C
271 lines
13 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) 2018 Ayke van Laethem
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* Copyright (c) 2019 Jim Mussared
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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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#ifndef MICROPY_INCLUDED_EXTMOD_MODBLUETOOTH_H
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#define MICROPY_INCLUDED_EXTMOD_MODBLUETOOTH_H
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#include <stdbool.h>
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#include "py/obj.h"
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#include "py/objlist.h"
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#include "py/ringbuf.h"
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// Port specific configuration.
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#ifndef MICROPY_PY_BLUETOOTH_RINGBUF_SIZE
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#define MICROPY_PY_BLUETOOTH_RINGBUF_SIZE (128)
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#endif
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#ifndef MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
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#define MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE (0)
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#endif
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#ifndef MICROPY_PY_BLUETOOTH_GATTS_ON_READ_CALLBACK
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#define MICROPY_PY_BLUETOOTH_GATTS_ON_READ_CALLBACK (0)
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#endif
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// This is used to protect the ringbuffer.
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#ifndef MICROPY_PY_BLUETOOTH_ENTER
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#define MICROPY_PY_BLUETOOTH_ENTER mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
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#define MICROPY_PY_BLUETOOTH_EXIT MICROPY_END_ATOMIC_SECTION(atomic_state);
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#endif
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// Common constants.
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#ifndef MP_BLUETOOTH_MAX_ATTR_SIZE
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#define MP_BLUETOOTH_MAX_ATTR_SIZE (20)
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#endif
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// Advertisement packet lengths
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#define MP_BLUETOOTH_GAP_ADV_MAX_LEN (32)
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#define MP_BLUETOOTH_CHARACTERISTIC_FLAG_READ (1 << 1)
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#define MP_BLUETOOTH_CHARACTERISTIC_FLAG_WRITE (1 << 3)
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#define MP_BLUETOOTH_CHARACTERISTIC_FLAG_NOTIFY (1 << 4)
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// For mp_bluetooth_gattc_write, the mode parameter
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#define MP_BLUETOOTH_WRITE_MODE_NO_RESPONSE (0)
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#define MP_BLUETOOTH_WRITE_MODE_WITH_RESPONSE (1)
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// Type value also doubles as length.
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#define MP_BLUETOOTH_UUID_TYPE_16 (2)
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#define MP_BLUETOOTH_UUID_TYPE_32 (4)
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#define MP_BLUETOOTH_UUID_TYPE_128 (16)
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// Address types (for the addr_type params).
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// Ports will need to map these to their own values.
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#define MP_BLUETOOTH_ADDR_PUBLIC (0x00) // Public (identity) address. (Same as NimBLE and NRF SD)
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#define MP_BLUETOOTH_ADDR_RANDOM_STATIC (0x01) // Random static (identity) address. (Same as NimBLE and NRF SD)
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#define MP_BLUETOOTH_ADDR_PUBLIC_ID (0x02) // (Same as NimBLE)
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#define MP_BLUETOOTH_ADDR_RANDOM_ID (0x03) // (Same as NimBLE)
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#define MP_BLUETOOTH_ADDR_RANDOM_PRIVATE_RESOLVABLE (0x12) // Random private resolvable address. (NRF SD 0x02)
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#define MP_BLUETOOTH_ADDR_RANDOM_PRIVATE_NON_RESOLVABLE (0x13) // Random private non-resolvable address. (NRF SD 0x03)
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// Event codes for the IRQ handler.
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// Can also be combined to pass to the trigger param to select which events you
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// are interested in.
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// Note this is currently stored in a uint16_t (in irq_trigger, and the event
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// arg to the irq handler), so one spare value remaining.
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#define MP_BLUETOOTH_IRQ_CENTRAL_CONNECT (1 << 0)
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#define MP_BLUETOOTH_IRQ_CENTRAL_DISCONNECT (1 << 1)
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#define MP_BLUETOOTH_IRQ_GATTS_WRITE (1 << 2)
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#define MP_BLUETOOTH_IRQ_GATTS_READ_REQUEST (1 << 3)
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#define MP_BLUETOOTH_IRQ_SCAN_RESULT (1 << 4)
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#define MP_BLUETOOTH_IRQ_SCAN_COMPLETE (1 << 5)
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#define MP_BLUETOOTH_IRQ_PERIPHERAL_CONNECT (1 << 6)
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#define MP_BLUETOOTH_IRQ_PERIPHERAL_DISCONNECT (1 << 7)
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#define MP_BLUETOOTH_IRQ_GATTC_SERVICE_RESULT (1 << 8)
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#define MP_BLUETOOTH_IRQ_GATTC_CHARACTERISTIC_RESULT (1 << 9)
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#define MP_BLUETOOTH_IRQ_GATTC_DESCRIPTOR_RESULT (1 << 10)
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#define MP_BLUETOOTH_IRQ_GATTC_READ_RESULT (1 << 11)
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#define MP_BLUETOOTH_IRQ_GATTC_WRITE_STATUS (1 << 12)
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#define MP_BLUETOOTH_IRQ_GATTC_NOTIFY (1 << 13)
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#define MP_BLUETOOTH_IRQ_GATTC_INDICATE (1 << 14)
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#define MP_BLUETOOTH_IRQ_ALL (0xffff)
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/*
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These aren't included in the module for space reasons, but can be used
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in your Python code if necessary.
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from micropython import const
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_IRQ_CENTRAL_CONNECT = const(1 << 0)
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_IRQ_CENTRAL_DISCONNECT = const(1 << 1)
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_IRQ_GATTS_WRITE = const(1 << 2)
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_IRQ_GATTS_READ_REQUEST = const(1 << 3)
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_IRQ_SCAN_RESULT = const(1 << 4)
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_IRQ_SCAN_COMPLETE = const(1 << 5)
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_IRQ_PERIPHERAL_CONNECT = const(1 << 6)
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_IRQ_PERIPHERAL_DISCONNECT = const(1 << 7)
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_IRQ_GATTC_SERVICE_RESULT = const(1 << 8)
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_IRQ_GATTC_CHARACTERISTIC_RESULT = const(1 << 9)
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_IRQ_GATTC_DESCRIPTOR_RESULT = const(1 << 10)
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_IRQ_GATTC_READ_RESULT = const(1 << 11)
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_IRQ_GATTC_WRITE_STATUS = const(1 << 12)
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_IRQ_GATTC_NOTIFY = const(1 << 13)
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_IRQ_GATTC_INDICATE = const(1 << 14)
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_IRQ_ALL = const(0xffff)
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*/
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// Common UUID type.
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// Ports are expected to map this to their own internal UUID types.
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// Internally the UUID data is little-endian, but the user should only
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// ever see this if they use the buffer protocol, e.g. in order to
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// construct an advertising payload (which needs to be in LE).
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// Both the constructor and the print function work in BE.
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typedef struct {
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mp_obj_base_t base;
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uint8_t type;
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uint8_t data[16];
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} mp_obj_bluetooth_uuid_t;
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//////////////////////////////////////////////////////////////
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// API implemented by ports (i.e. called from modbluetooth.c):
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// TODO: At the moment this only allows for a single `Bluetooth` instance to be created.
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// Ideally in the future we'd be able to have multiple instances or to select a specific BT driver or HCI UART.
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// So these global methods should be replaced with a struct of function pointers (like the machine.I2C implementations).
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// Any method returning an int returns errno on failure, otherwise zero.
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// Note: All methods dealing with addresses (as 6-byte uint8 pointers) are in big-endian format.
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// (i.e. the same way they would be printed on a device sticker or in a UI), so the user sees
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// addresses in a way that looks like what they'd expect.
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// This means that the lower level implementation will likely need to reorder them (e.g. Nimble
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// works in little-endian, as does BLE itself).
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// Enables the Bluetooth stack.
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int mp_bluetooth_init(void);
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// Disables the Bluetooth stack. Is a no-op when not enabled.
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void mp_bluetooth_deinit(void);
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// Returns true when the Bluetooth stack is enabled.
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bool mp_bluetooth_is_enabled(void);
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// Gets the MAC addr of this device in big-endian format.
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void mp_bluetooth_get_device_addr(uint8_t *addr);
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// Start advertisement. Will re-start advertisement when already enabled.
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// Returns errno on failure.
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int mp_bluetooth_gap_advertise_start(bool connectable, int32_t interval_us, const uint8_t *adv_data, size_t adv_data_len, const uint8_t *sr_data, size_t sr_data_len);
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// Stop advertisement. No-op when already stopped.
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void mp_bluetooth_gap_advertise_stop(void);
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// Start adding services. Must be called before mp_bluetooth_register_service.
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int mp_bluetooth_gatts_register_service_begin(bool append);
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// // Add a service with the given list of characteristics to the queue to be registered.
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// The value_handles won't be valid until after mp_bluetooth_register_service_end is called.
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int mp_bluetooth_gatts_register_service(mp_obj_bluetooth_uuid_t *service_uuid, mp_obj_bluetooth_uuid_t **characteristic_uuids, uint8_t *characteristic_flags, mp_obj_bluetooth_uuid_t **descriptor_uuids, uint8_t *descriptor_flags, uint8_t *num_descriptors, uint16_t *handles, size_t num_characteristics);
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// Register any queued services.
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int mp_bluetooth_gatts_register_service_end();
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// Read the value from the local gatts db (likely this has been written by a central).
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int mp_bluetooth_gatts_read(uint16_t value_handle, uint8_t **value, size_t *value_len);
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// Write a value to the local gatts db (ready to be queried by a central).
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int mp_bluetooth_gatts_write(uint16_t value_handle, const uint8_t *value, size_t value_len);
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// Notify the central that it should do a read.
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int mp_bluetooth_gatts_notify(uint16_t conn_handle, uint16_t value_handle);
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// Notify the central, including a data payload. (Note: does not set the gatts db value).
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int mp_bluetooth_gatts_notify_send(uint16_t conn_handle, uint16_t value_handle, const uint8_t *value, size_t *value_len);
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// Indicate the central.
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int mp_bluetooth_gatts_indicate(uint16_t conn_handle, uint16_t value_handle);
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// Resize and enable/disable append-mode on a value.
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// Append-mode means that remote writes will append and local reads will clear after reading.
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int mp_bluetooth_gatts_set_buffer(uint16_t value_handle, size_t len, bool append);
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// Disconnect from a central or peripheral.
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int mp_bluetooth_gap_disconnect(uint16_t conn_handle);
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#if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
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// Start a discovery (scan). Set duration to zero to run continuously.
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int mp_bluetooth_gap_scan_start(int32_t duration_ms, int32_t interval_us, int32_t window_us);
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// Stop discovery (if currently active).
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int mp_bluetooth_gap_scan_stop(void);
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// Connect to a found peripheral.
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int mp_bluetooth_gap_peripheral_connect(uint8_t addr_type, const uint8_t *addr, int32_t duration_ms);
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// Find all primary services on the connected peripheral.
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int mp_bluetooth_gattc_discover_primary_services(uint16_t conn_handle);
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// Find all characteristics on the specified service on a connected peripheral.
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int mp_bluetooth_gattc_discover_characteristics(uint16_t conn_handle, uint16_t start_handle, uint16_t end_handle);
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// Find all descriptors on the specified characteristic on a connected peripheral.
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int mp_bluetooth_gattc_discover_descriptors(uint16_t conn_handle, uint16_t start_handle, uint16_t end_handle);
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// Initiate read of a value from the remote peripheral.
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int mp_bluetooth_gattc_read(uint16_t conn_handle, uint16_t value_handle);
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// Write the value to the remote peripheral.
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int mp_bluetooth_gattc_write(uint16_t conn_handle, uint16_t value_handle, const uint8_t *value, size_t *value_len, unsigned int mode);
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#endif
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/////////////////////////////////////////////////////////////////////////////
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// API implemented by modbluetooth (called by port-specific implementations):
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// Notify modbluetooth that a connection/disconnection event has occurred.
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void mp_bluetooth_gap_on_connected_disconnected(uint16_t event, uint16_t conn_handle, uint8_t addr_type, const uint8_t *addr);
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// Call this when a characteristic is written to.
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void mp_bluetooth_gatts_on_write(uint16_t conn_handle, uint16_t value_handle);
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#if MICROPY_PY_BLUETOOTH_GATTS_ON_READ_CALLBACK
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// Call this when a characteristic is read from. Return false to deny the read.
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bool mp_bluetooth_gatts_on_read_request(uint16_t conn_handle, uint16_t value_handle);
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#endif
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#if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
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// Notify modbluetooth that scan has finished, either timeout, manually, or by some other action (e.g. connecting).
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void mp_bluetooth_gap_on_scan_complete(void);
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// Notify modbluetooth of a scan result.
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void mp_bluetooth_gap_on_scan_result(uint8_t addr_type, const uint8_t *addr, bool connectable, const int8_t rssi, const uint8_t *data, size_t data_len);
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// Notify modbluetooth that a service was found (either by discover-all, or discover-by-uuid).
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void mp_bluetooth_gattc_on_primary_service_result(uint16_t conn_handle, uint16_t start_handle, uint16_t end_handle, mp_obj_bluetooth_uuid_t *service_uuid);
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// Notify modbluetooth that a characteristic was found (either by discover-all-on-service, or discover-by-uuid-on-service).
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void mp_bluetooth_gattc_on_characteristic_result(uint16_t conn_handle, uint16_t def_handle, uint16_t value_handle, uint8_t properties, mp_obj_bluetooth_uuid_t *characteristic_uuid);
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// Notify modbluetooth that a descriptor was found.
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void mp_bluetooth_gattc_on_descriptor_result(uint16_t conn_handle, uint16_t handle, mp_obj_bluetooth_uuid_t *descriptor_uuid);
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// Notify modbluetooth that a read has completed with data (or notify/indicate data available, use `event` to disambiguate).
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// Note: these functions are to be called in a group protected by MICROPY_PY_BLUETOOTH_ENTER/EXIT.
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// _start returns the number of bytes to submit to the calls to _chunk, followed by a call to _end.
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size_t mp_bluetooth_gattc_on_data_available_start(uint16_t event, uint16_t conn_handle, uint16_t value_handle, size_t data_len);
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void mp_bluetooth_gattc_on_data_available_chunk(const uint8_t *data, size_t data_len);
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void mp_bluetooth_gattc_on_data_available_end(void);
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// Notify modbluetooth that a write has completed.
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void mp_bluetooth_gattc_on_write_status(uint16_t conn_handle, uint16_t value_handle, uint16_t status);
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#endif
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#endif // MICROPY_INCLUDED_EXTMOD_MODBLUETOOTH_H
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