start to add pio usb (host) support

run as proof of concept

hw/bsp/rp2040/family.c

@@ -127,6 +127,9 @@ void board_init(void)
 #ifndef BUTTON_BOOTSEL
 #endif
 
+  // Set the system clock to a multiple of 120mhz for bitbanging USB with pico-usb
+  set_sys_clock_khz(120000, true);
+
 #if defined(UART_DEV) && defined(LIB_PICO_STDIO_UART)
   bi_decl(bi_2pins_with_func(UART_TX_PIN, UART_TX_PIN, GPIO_FUNC_UART));
   uart_inst = uart_get_instance(UART_DEV);

hw/bsp/rp2040/family.cmake

@@ -89,13 +89,27 @@ if (NOT TARGET _rp2040_family_inclusion_marker)
 			${TOP}/src/class/hid/hid_host.c
 			${TOP}/src/class/msc/msc_host.c
 			${TOP}/src/class/vendor/vendor_host.c
+
+			${TOP}/src/portable/raspberrypi/pio/hcd_pio.c
+			${TOP}/lib/Pico-PIO-USB/pio_usb.c
+			${TOP}/lib/Pico-PIO-USB/usb_crc.c
 			)
 
-	# Sometimes have to do host specific actions in mostly
-	# common functions
+	# Sometimes have to do host specific actions in mostly common functions
 	target_compile_definitions(tinyusb_host_base INTERFACE
 			RP2040_USB_HOST_MODE=1
 	)
+	
+	# config for host pio
+	target_link_libraries(tinyusb_host_base INTERFACE
+	   hardware_dma
+	   hardware_pio
+	   pico_multicore
+	   )
+	   
+	target_include_directories(tinyusb_host_base INTERFACE
+	   ${TOP}/lib/Pico-PIO-USB
+	   )
 
 	add_library(tinyusb_bsp INTERFACE)
 	target_sources(tinyusb_bsp INTERFACE
@@ -151,6 +165,8 @@ if (NOT TARGET _rp2040_family_inclusion_marker)
 		_family_initialize_project(${PROJECT} ${DIR})
 		enable_language(C CXX ASM)
 		pico_sdk_init()
+    pico_generate_pio_header(tinyusb_host_base ${TOP}/lib/Pico-PIO-USB/usb_tx.pio)
+    pico_generate_pio_header(tinyusb_host_base ${TOP}/lib/Pico-PIO-USB/usb_rx.pio)
 	endfunction()
 
 	# This method must be called from the project scope to suppress known warnings in TinyUSB source files