1 files changed, 173 insertions, 0 deletions
diff --git a/extmod/btstack/btstack_hci_uart.c b/extmod/btstack/btstack_hci_uart.c
new file mode 100644
index 0000000000..5c96e02dc0
--- /dev/null
+++ b/extmod/btstack/btstack_hci_uart.c
@@ -0,0 +1,173 @@
+/*
+ * 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"
+
+// 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 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.
+    mp_bluetooth_hci_uart_init(MICROPY_HW_BLE_UART_ID, 0);
+    mp_bluetooth_hci_controller_init();
+
+    return 0;
+}
+
+STATIC int btstack_uart_open(void) {
+    return 0;
+}
+
+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) {
+    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) {
+            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