Add Bluetooth examples

Co-authored-by: Peter Harper <77111776+peterharperuk@users.noreply.github.com>

pico_w/bt/standalone/btstack_config.h

@@ -0,0 +1,58 @@
+#ifndef _PICO_BTSTACK_BTSTACK_CONFIG_H
+#define _PICO_BTSTACK_BTSTACK_CONFIG_H
+
+#ifndef ENABLE_BLE
+#error Please link to pico_btstack_ble
+#endif
+
+// BTstack features that can be enabled
+#define ENABLE_LE_PERIPHERAL
+#define ENABLE_LOG_INFO
+#define ENABLE_LOG_ERROR
+#define ENABLE_PRINTF_HEXDUMP
+
+// for the client
+#if RUNNING_AS_CLIENT
+#define ENABLE_LE_CENTRAL
+#define MAX_NR_GATT_CLIENTS 1
+#else
+#define MAX_NR_GATT_CLIENTS 0
+#endif
+
+// BTstack configuration. buffers, sizes, ...
+#define HCI_OUTGOING_PRE_BUFFER_SIZE 4
+#define HCI_ACL_PAYLOAD_SIZE (255 + 4)
+#define HCI_ACL_CHUNK_SIZE_ALIGNMENT 4
+#define MAX_NR_HCI_CONNECTIONS 1
+#define MAX_NR_SM_LOOKUP_ENTRIES 3
+#define MAX_NR_WHITELIST_ENTRIES 16
+#define MAX_NR_LE_DEVICE_DB_ENTRIES 16
+
+// Limit number of ACL/SCO Buffer to use by stack to avoid cyw43 shared bus overrun
+#define MAX_NR_CONTROLLER_ACL_BUFFERS 3
+#define MAX_NR_CONTROLLER_SCO_PACKETS 3
+
+// Enable and configure HCI Controller to Host Flow Control to avoid cyw43 shared bus overrun
+#define ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
+#define HCI_HOST_ACL_PACKET_LEN (255+4)
+#define HCI_HOST_ACL_PACKET_NUM 3
+#define HCI_HOST_SCO_PACKET_LEN 120
+#define HCI_HOST_SCO_PACKET_NUM 3
+
+// Link Key DB and LE Device DB using TLV on top of Flash Sector interface
+#define NVM_NUM_DEVICE_DB_ENTRIES 16
+#define NVM_NUM_LINK_KEYS 16
+
+// We don't give btstack a malloc, so use a fixed-size ATT DB.
+#define MAX_ATT_DB_SIZE 512
+
+// BTstack HAL configuration
+#define HAVE_EMBEDDED_TIME_MS
+// map btstack_assert onto Pico SDK assert()
+#define HAVE_ASSERT
+// Some USB dongles take longer to respond to HCI reset (e.g. BCM20702A).
+#define HCI_RESET_RESEND_TIMEOUT_MS 1000
+#define ENABLE_SOFTWARE_AES128
+#define ENABLE_MICRO_ECC_FOR_LE_SECURE_CONNECTIONS
+
+#endif // MICROPY_INCLUDED_EXTMOD_BTSTACK_BTSTACK_CONFIG_H