extmod/btstack: Detect HCI UART init failure.

extmod/btstack/btstack_hci_uart.c

@@ -50,6 +50,7 @@ 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;
@@ -62,14 +63,21 @@ STATIC int btstack_uart_init(const btstack_uart_config_t *uart_config) {
 
     // 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();
+    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 0;
+    return init_success ? 0 : 1;
 }
 
 STATIC int btstack_uart_close(void) {

extmod/btstack/modbluetooth_btstack.c

@@ -317,6 +317,9 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
             // Signal that de-initialisation has completed.
             mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
         }
+    } else if (event_type == BTSTACK_EVENT_POWERON_FAILED) {
+        // Signal that initialisation has failed.
+        mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
     } else if (event_type == HCI_EVENT_TRANSPORT_PACKET_SENT) {
         DEBUG_printf("  --> hci transport packet sent\n");
     } else if (event_type == HCI_EVENT_COMMAND_COMPLETE) {
@@ -644,6 +647,8 @@ int mp_bluetooth_init(void) {
     if (mp_bluetooth_btstack_state != MP_BLUETOOTH_BTSTACK_STATE_ACTIVE) {
         DEBUG_printf("mp_bluetooth_init: stack startup timed out\n");
 
+        bool timeout = mp_bluetooth_btstack_state == MP_BLUETOOTH_BTSTACK_STATE_TIMEOUT;
+
         // Required to stop the polling loop.
         mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
         // Attempt a shutdown (may not do anything).
@@ -652,7 +657,7 @@ int mp_bluetooth_init(void) {
         // Clean up.
         MP_STATE_PORT(bluetooth_btstack_root_pointers) = NULL;
 
-        return MP_ETIMEDOUT;
+        return timeout ? MP_ETIMEDOUT : MP_EINVAL;
     }
 
     DEBUG_printf("mp_bluetooth_init: stack startup complete\n");

ports/unix/mpbthciport.c

@@ -124,12 +124,12 @@ int mp_bluetooth_hci_uart_init(uint32_t port, uint32_t baudrate) {
     if (path != NULL) {
         strcpy(uart_device_name, path);
     }
-    DEBUG_printf("Using HCI UART: %s\n", uart_device_name);
+    DEBUG_printf("mp_bluetooth_hci_uart_init: Using HCI UART: %s\n", uart_device_name);
 
     int flags = O_RDWR | O_NOCTTY | O_NONBLOCK;
     uart_fd = open(uart_device_name, flags);
     if (uart_fd == -1) {
-        DEBUG_printf("Unable to open port %s", uart_device_name);
+        printf("mp_bluetooth_hci_uart_init: Unable to open port %s\n", uart_device_name);
         return -1;
     }