circuitpython/extmod/btstack/btstack_hci_uart.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 Damien P. George
* Copyright (c) 2020 Jim Mussared
*
* 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 "py/mperrno.h"
#include "py/mphal.h"
#if MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK
#include "lib/btstack/src/btstack.h"
#include "extmod/mpbthci.h"
#include "extmod/btstack/btstack_hci_uart.h"
#include "mpbtstackport.h"
#define HCI_TRACE (0)
#define COL_OFF "\033[0m"
#define COL_GREEN "\033[0;32m"
#define COL_BLUE "\033[0;34m"
// Implements a btstack btstack_uart_block_t on top of the mphciuart.h
// interface to an HCI UART provided by the port.
// We pass the bytes directly to the UART during a send, but then notify btstack in the next poll.
STATIC bool send_done;
STATIC void (*send_handler)(void);
// btstack issues a read of len bytes, and gives us a buffer to asynchronously fill up.
STATIC uint8_t *recv_buf;
STATIC size_t recv_len;
STATIC size_t recv_idx;
STATIC void (*recv_handler)(void);
STATIC bool init_success = false;
STATIC int btstack_uart_init(const btstack_uart_config_t *uart_config) {
(void)uart_config;
send_done = false;
recv_len = 0;
recv_idx = 0;
recv_handler = NULL;
send_handler = NULL;
// Set up the UART peripheral, attach IRQ and power up the HCI controller.
// We haven't been told the baud rate yet, so defer that until btstack_uart_set_baudrate.
if (mp_bluetooth_hci_uart_init(MICROPY_HW_BLE_UART_ID, 0)) {
init_success = false;
return -1;
}
if (mp_bluetooth_hci_controller_init()) {
init_success = false;
return -1;
}
init_success = true;
return 0;
}
STATIC int btstack_uart_open(void) {
return init_success ? 0 : 1;
}
STATIC int btstack_uart_close(void) {
mp_bluetooth_hci_controller_deinit();
return 0;
}
STATIC void btstack_uart_set_block_received(void (*block_handler)(void)) {
recv_handler = block_handler;
}
STATIC void btstack_uart_set_block_sent(void (*block_handler)(void)) {
send_handler = block_handler;
}
STATIC int btstack_uart_set_baudrate(uint32_t baudrate) {
mp_bluetooth_hci_uart_set_baudrate(baudrate);
return 0;
}
STATIC int btstack_uart_set_parity(int parity) {
(void)parity;
return 0;
}
STATIC int btstack_uart_set_flowcontrol(int flowcontrol) {
(void)flowcontrol;
return 0;
}
STATIC void btstack_uart_receive_block(uint8_t *buf, uint16_t len) {
recv_buf = buf;
recv_len = len;
}
STATIC void btstack_uart_send_block(const uint8_t *buf, uint16_t len) {
#if HCI_TRACE
printf(COL_GREEN "< [% 8d] %02x", (int)mp_hal_ticks_ms(), buf[0]);
for (size_t i = 1; i < len; ++i) {
printf(":%02x", buf[i]);
}
printf(COL_OFF "\n");
#endif
mp_bluetooth_hci_uart_write(buf, len);
send_done = true;
}
STATIC int btstack_uart_get_supported_sleep_modes(void) {
return 0;
}
STATIC void btstack_uart_set_sleep(btstack_uart_sleep_mode_t sleep_mode) {
(void)sleep_mode;
// printf("btstack_uart_set_sleep %u\n", sleep_mode);
}
STATIC void btstack_uart_set_wakeup_handler(void (*wakeup_handler)(void)) {
(void)wakeup_handler;
// printf("btstack_uart_set_wakeup_handler\n");
}
const btstack_uart_block_t mp_bluetooth_btstack_hci_uart_block = {
&btstack_uart_init,
&btstack_uart_open,
&btstack_uart_close,
&btstack_uart_set_block_received,
&btstack_uart_set_block_sent,
&btstack_uart_set_baudrate,
&btstack_uart_set_parity,
&btstack_uart_set_flowcontrol,
&btstack_uart_receive_block,
&btstack_uart_send_block,
&btstack_uart_get_supported_sleep_modes,
&btstack_uart_set_sleep,
&btstack_uart_set_wakeup_handler,
};
void mp_bluetooth_btstack_hci_uart_process(void) {
bool host_wake = mp_bluetooth_hci_controller_woken();
if (send_done) {
// If we'd done a TX in the last interval, notify btstack that it's complete.
send_done = false;
if (send_handler) {
send_handler();
}
}
// Append any new bytes to the recv buffer, notifying bstack if we've got
// the number of bytes it was looking for.
int chr;
while (recv_idx < recv_len && (chr = mp_bluetooth_hci_uart_readchar()) >= 0) {
recv_buf[recv_idx++] = chr;
if (recv_idx == recv_len) {
#if HCI_TRACE
printf(COL_BLUE "> [% 8d] %02x", (int)mp_hal_ticks_ms(), recv_buf[0]);
for (size_t i = 1; i < recv_len; ++i) {
printf(":%02x", recv_buf[i]);
}
printf(COL_OFF "\n");
#endif
recv_idx = 0;
recv_len = 0;
if (recv_handler) {
recv_handler();
}
}
}
if (host_wake) {
mp_bluetooth_hci_controller_sleep_maybe();
}
}
#endif // MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK