1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/esp-hosted/esp_hosted_bthci_uart.c b/drivers/esp-hosted/esp_hosted_bthci_uart.c
new file mode 100644
index 000000000..003054460
--- /dev/null
+++ b/drivers/esp-hosted/esp_hosted_bthci_uart.c
@@ -0,0 +1,149 @@
+/*
+ * 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()) {
+            MICROPY_EVENT_POLL_HOOK
+            // 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();
+        }
+        MICROPY_EVENT_POLL_HOOK
+    }
+
+    #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