pbio/drv/bluetooth_btstack: Add POSIX variant for virtualhub.

- Changes pbdrv_bluetooth_btstack_set_chipset to convey all necessary
  information to set the correct chipset both from the read local
  version information command as well as events from the USB subsystem.
- Adds a POSIX implementation for pbdrv_bluetooth_btstack_set_chipset.
  This supports TP-LINK UB500.
- Sets up the virtualhub platform to use this chipset.
- Adjusts the runloop to check for readability and writability of
  file descriptors, which is required for the libusb transport.

Co-authored-by: Laurens Valk <laurens@pybricks.com>

Author: jaguilar

.vscode/c_cpp_properties.json

@@ -386,6 +386,10 @@
                 "${workspaceFolder}/bricks/virtualhub",
                 "${workspaceFolder}/bricks/virtualhub/build",
                 "${workspaceFolder}/bricks/virtualhub/build-debug",
+                "${workspaceFolder}/lib/btstack/chipset/realtek",
+                "${workspaceFolder}/lib/btstack/platform/libusb",
+                "${workspaceFolder}/lib/btstack/platform/posix",
+                "${workspaceFolder}/lib/btstack/src",
                 "${workspaceFolder}/lib/lego",
                 "${workspaceFolder}/lib/lwrb/src/include",
                 "${workspaceFolder}/lib/pbio",
@@ -394,7 +398,8 @@
                 "${workspaceFolder}/micropython",
                 "${workspaceFolder}",
                 "${workspaceFolder}/lib/umm_malloc/src",
-                "/usr/include/python3.10"
+                "/usr/include/python3.10",
+                "/usr/include/libusb-1.0"
             ],
             "defines": [
                 "MICROPY_MODULE_FROZEN_MPY",

.vscode/launch.json

@@ -75,6 +75,10 @@
                     "name": "PBIO_TEST_CONNECT_SOCKET",
                     "value": "true"
                 },
+                {
+                    "name": "UB500_INDEX",
+                    "value": "0"
+                }
             ],
             "externalConsole": false,
             "MIMode": "gdb",

bricks/_common/common.mk

@@ -124,6 +124,18 @@ endif
 ifneq ($(strip $(PB_LIB_BTSTACK)),)
 INC += -I$(PBTOP)/lib/btstack/chipset/cc256x
 INC += -I$(PBTOP)/lib/btstack/src
+ifeq ($(PBIO_PLATFORM),virtual_hub)
+INC += -I$(PBTOP)/lib/btstack/platform/posix
+INC += -I$(PBTOP)/lib/btstack/platform/embedded
+INC += -I$(PBTOP)/lib/btstack/3rd-party/tinydir
+INC += -I$(PBTOP)/lib/btstack/3rd-party/rijndael
+INC += -I$(PBTOP)/lib/btstack/3rd-party/micro-ecc
+INC += -I$(PBTOP)/lib/btstack/chipset/bcm
+INC += -I$(PBTOP)/lib/btstack/chipset/intel
+INC += -I$(PBTOP)/lib/btstack/chipset/realtek
+INC += -I$(PBTOP)/lib/btstack/chipset/zephyr
+INC += $(shell pkg-config libusb-1.0 --cflags)
+endif
 endif
 ifeq ($(PB_LIB_LSM6DS3TR_C),1)
 INC += -I$(PBTOP)/lib/lsm6ds3tr_c_STdC/driver
@@ -162,6 +174,9 @@ else ifeq ($(UNAME_S),Darwin)
 LDFLAGS += -Wl,-map,$@.map -Wl,-dead_strip
 endif
 LIBS = -lm
+ifeq ($(PB_LIB_BTSTACK),lowenergy)
+LIBS += $(shell pkg-config libusb-1.0 --libs)
+endif
 else # end native, begin embedded
 CROSS_COMPILE ?= arm-none-eabi-
 ifeq ($(PB_MCU_FAMILY),STM32)
@@ -395,6 +410,25 @@ BTSTACK_SRC_C += $(addprefix lib/btstack/chipset/cc256x/,\
 	btstack_chipset_cc256x.c \
 	)
 
+# libusb-specific BTStack sources for virtual_hub
+ifeq ($(PBIO_PLATFORM),virtual_hub)
+BTSTACK_SRC_C += $(addprefix lib/btstack/,\
+	platform/libusb/hci_transport_h2_libusb.c \
+	platform/posix/hci_dump_posix_stdout.c \
+	platform/posix/btstack_tlv_posix.c \
+	src/classic/btstack_link_key_db_tlv.c \
+	src/ble/le_device_db_tlv.c \
+	chipset/zephyr/btstack_chipset_zephyr.c \
+	chipset/realtek/btstack_chipset_realtek.c \
+	chipset/bcm/btstack_chipset_bcm.c \
+	chipset/intel/btstack_chipset_intel_firmware.c \
+	3rd-party/rijndael/rijndael.c \
+	3rd-party/micro-ecc/uECC.c \
+	)
+# Suppress unused variable warning for this file
+$(BUILD)/lib/btstack/platform/libusb/hci_transport_h2_libusb.o: CFLAGS += -Wno-unused-variable
+endif
+
 # STM32 HAL
 
 COPT += -DUSE_FULL_LL_DRIVER
@@ -529,11 +563,13 @@ endif
 
 ifeq ($(PB_LIB_BTSTACK),classic)
 OBJ += $(addprefix $(BUILD)/, $(BTSTACK_SRC_C:.c=.o))
+$(BUILD)/lib/btstack/%.o: CFLAGS += -Wno-error
 endif
 
 ifeq ($(PB_LIB_BTSTACK),lowenergy)
 OBJ += $(addprefix $(BUILD)/, $(BTSTACK_SRC_C:.c=.o))
 OBJ += $(addprefix $(BUILD)/, $(BTSTACK_BLE_SRC_C:.c=.o))
+$(BUILD)/lib/btstack/%.o: CFLAGS += -Wno-error
 endif
 
 ifeq ($(PB_LIB_STM32_HAL),1)

bricks/_common/sources.mk

@@ -115,9 +115,10 @@ PBIO_SRC_C = $(addprefix lib/pbio/,\
 	drv/block_device/block_device_test.c \
 	drv/block_device/block_device_w25qxx_stm32.c \
 	drv/bluetooth/bluetooth.c \
-	drv/bluetooth/bluetooth_btstack_stm32_hal.c \
 	drv/bluetooth/bluetooth_btstack.c \
 	drv/bluetooth/bluetooth_btstack_ev3.c \
+	drv/bluetooth/bluetooth_btstack_posix.c \
+	drv/bluetooth/bluetooth_btstack_stm32_hal.c \
 	drv/bluetooth/bluetooth_simulation.c \
 	drv/bluetooth/bluetooth_stm32_bluenrg.c \
 	drv/bluetooth/bluetooth_stm32_cc2640.c \

bricks/virtualhub/Makefile

@@ -6,5 +6,6 @@ PB_MCU_FAMILY = native
 PB_FROZEN_MODULES = 1
 MICROPY_ROM_TEXT_COMPRESSION = 1
 PB_LIB_UMM_MALLOC = 1
+PB_LIB_BTSTACK = lowenergy
 
 include ../_common/common.mk