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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2023 Arduino SA
*
* 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.
*
* ESP-Hosted Bluetooth HCI driver.
*/
#include "py/mphal.h"
#if MICROPY_PY_BLUETOOTH && MICROPY_PY_NETWORK_ESP_HOSTED
#include <stdio.h>
#include <string.h>
#include "py/runtime.h"
#include "extmod/mpbthci.h"
#include "esp_hosted_hal.h"
#define HCI_COMMAND_PACKET (0x01)
#define HCI_ACLDATA_PACKET (0x02)
#define HCI_EVENT_PACKET (0x04)
#define HCI_COMMAND_COMPLETE (0x0e)
#define HCI_COMMAND_TIMEOUT (3000)
#define OGF_LINK_CTL (0x01)
#define OGF_HOST_CTL (0x03)
#define OCF_SET_EVENT_MASK (0x0001)
#define OCF_RESET (0x0003)
// Provided by the port, and also possibly shared with the stack.
extern uint8_t mp_bluetooth_hci_cmd_buf[4 + 256];
int esp_hosted_hci_cmd(int ogf, int ocf, size_t param_len, const uint8_t *param_buf) {
uint8_t *buf = mp_bluetooth_hci_cmd_buf;
buf[0] = HCI_COMMAND_PACKET;
buf[1] = ocf;
buf[2] = ogf << 2 | ocf >> 8;
buf[3] = param_len;
if (param_len) {
memcpy(buf + 4, param_buf, param_len);
}
debug_printf("HCI Command: %02x %02x %02x %02x\n", buf[0], buf[1], buf[2], buf[3]);
mp_bluetooth_hci_uart_write(buf, 4 + param_len);
// Receive HCI event packet, initially reading 3 bytes (HCI Event, Event code, Plen).
for (mp_uint_t start = mp_hal_ticks_ms(), size = 3, i = 0; i < size;) {
while (!mp_bluetooth_hci_uart_any()) {
mp_event_wait_ms(1);
// Timeout.
if ((mp_hal_ticks_ms() - start) > HCI_COMMAND_TIMEOUT) {
error_printf("timeout waiting for HCI packet\n");
return -1;
}
}
buf[i] = mp_bluetooth_hci_uart_readchar();
// There seems to be a sync issue with this fw/module.
if (i == 0 && buf[0] == 0xFF) {
continue;
}
// Check for packet type.
if (i == 0 && buf[0] != HCI_EVENT_PACKET) {
error_printf("unexpected HCI packet: %02x\n", buf[0]);
return -1;
}
// Sanity check the packet parameters length.
if (i == 2 && ((size += buf[2]) > sizeof(mp_bluetooth_hci_cmd_buf))) {
error_printf("unexpected event packet length: %d\n", size);
return -1;
}
i++;
}
// We're only looking for command complete events.
if (buf[1] != HCI_COMMAND_COMPLETE || buf[4] != ocf || buf[5] != (ogf << 2 | ocf >> 8)) {
error_printf("response mismatch: %02x %02x\n", buf[4], buf[5]);
return -1;
}
// Log event.
debug_printf("HCI Event packet: %02x %02x %02x %02x %02x %02x %02x\n",
buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
// Status code.
return buf[6];
}
int mp_bluetooth_hci_controller_init(void) {
// Low-level pins init, memory pool allocation etc...
esp_hosted_hal_init(ESP_HOSTED_MODE_BT);
mp_uint_t start = mp_hal_ticks_ms();
// Skip bootloader messages.
while ((mp_hal_ticks_ms() - start) < 2500) {
if (mp_bluetooth_hci_uart_any()) {
mp_bluetooth_hci_uart_readchar();
}
mp_event_wait_ms(1);
}
#ifdef MICROPY_HW_BLE_UART_BAUDRATE_SECONDARY
mp_bluetooth_hci_uart_set_baudrate(MICROPY_HW_BLE_UART_BAUDRATE_SECONDARY);
#endif
mp_hal_pin_output(MICROPY_HW_BLE_UART_RTS);
mp_hal_pin_write(MICROPY_HW_BLE_UART_RTS, 0);
// Send reset command
// It seems that nothing else is needed for now.
return esp_hosted_hci_cmd(OGF_HOST_CTL, OCF_RESET, 0, NULL);
}
int mp_bluetooth_hci_controller_deinit(void) {
esp_hosted_hal_deinit();
return 0;
}
#endif
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