Merge pull request #280 from majbthrd/nuc505

add Nuvoton NUC505

17 files changed, 1020 insertions, 11 deletions

diff --git a/README.md b/README.md
index 29052d01a..7ab55f781 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ The stack supports the following MCUs:
 - **Sony:** CXD56
 - **ST:** STM32 series: L0, F0, F1, F2, F3, F4, F7, H7 (device only)
 - **[ValentyUSB](https://github.com/im-tomu/valentyusb)** eptri
-- **Nuvoton:** NUC121/NUC125, NUC126
+- **Nuvoton:** NUC121/NUC125, NUC126, NUC505
 
 [Here is the list of supported Boards](docs/boards.md) that can be used with provided examples.
 
diff --git a/examples/device/cdc_dual_ports/src/tusb_config.h b/examples/device/cdc_dual_ports/src/tusb_config.h
index 734b96c16..9783bd4f6 100644
--- a/examples/device/cdc_dual_ports/src/tusb_config.h
+++ b/examples/device/cdc_dual_ports/src/tusb_config.h
@@ -39,7 +39,7 @@
   #error CFG_TUSB_MCU must be defined
 #endif
 
-#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX
+#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX || CFG_TUSB_MCU == OPT_MCU_NUC505
 #define CFG_TUSB_RHPORT0_MODE       (OPT_MODE_DEVICE | OPT_MODE_HIGH_SPEED)
 #else
 #define CFG_TUSB_RHPORT0_MODE       OPT_MODE_DEVICE
diff --git a/examples/device/cdc_msc/src/tusb_config.h b/examples/device/cdc_msc/src/tusb_config.h
index 5b7a1671e..d881cb638 100644
--- a/examples/device/cdc_msc/src/tusb_config.h
+++ b/examples/device/cdc_msc/src/tusb_config.h
@@ -39,7 +39,7 @@
   #error CFG_TUSB_MCU must be defined
 #endif
 
-#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX
+#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX || CFG_TUSB_MCU == OPT_MCU_NUC505
 #define CFG_TUSB_RHPORT0_MODE       (OPT_MODE_DEVICE | OPT_MODE_HIGH_SPEED)
 #else
 #define CFG_TUSB_RHPORT0_MODE       OPT_MODE_DEVICE
diff --git a/examples/device/cdc_msc_hid_freertos/src/tusb_config.h b/examples/device/cdc_msc_hid_freertos/src/tusb_config.h
index 6788a7483..39738333c 100644
--- a/examples/device/cdc_msc_hid_freertos/src/tusb_config.h
+++ b/examples/device/cdc_msc_hid_freertos/src/tusb_config.h
@@ -39,7 +39,7 @@
   #error CFG_TUSB_MCU must be defined
 #endif
 
-#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX
+#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX || CFG_TUSB_MCU == OPT_MCU_NUC505
 #define CFG_TUSB_RHPORT0_MODE       (OPT_MODE_DEVICE | OPT_MODE_HIGH_SPEED)
 #else
 #define CFG_TUSB_RHPORT0_MODE       OPT_MODE_DEVICE
diff --git a/examples/device/dfu_rt/src/tusb_config.h b/examples/device/dfu_rt/src/tusb_config.h
index 27afdb6b6..96c3a2468 100644
--- a/examples/device/dfu_rt/src/tusb_config.h
+++ b/examples/device/dfu_rt/src/tusb_config.h
@@ -21,7 +21,7 @@
   #error CFG_TUSB_MCU must be defined
 #endif
 
-#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX
+#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX || CFG_TUSB_MCU == OPT_MCU_NUC505
 #define CFG_TUSB_RHPORT0_MODE       (OPT_MODE_DEVICE | OPT_MODE_HIGH_SPEED)
 #else
 #define CFG_TUSB_RHPORT0_MODE       OPT_MODE_DEVICE
diff --git a/examples/device/hid_composite/src/tusb_config.h b/examples/device/hid_composite/src/tusb_config.h
index dd360741d..6d2fd0836 100644
--- a/examples/device/hid_composite/src/tusb_config.h
+++ b/examples/device/hid_composite/src/tusb_config.h
@@ -39,7 +39,7 @@
   #error CFG_TUSB_MCU must be defined
 #endif
 
-#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX
+#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX || CFG_TUSB_MCU == OPT_MCU_NUC505
 #define CFG_TUSB_RHPORT0_MODE       (OPT_MODE_DEVICE | OPT_MODE_HIGH_SPEED)
 #else
 #define CFG_TUSB_RHPORT0_MODE       OPT_MODE_DEVICE
diff --git a/examples/device/hid_generic_inout/src/tusb_config.h b/examples/device/hid_generic_inout/src/tusb_config.h
index 0053a7d0a..2debafd2a 100644
--- a/examples/device/hid_generic_inout/src/tusb_config.h
+++ b/examples/device/hid_generic_inout/src/tusb_config.h
@@ -39,7 +39,7 @@
   #error CFG_TUSB_MCU must be defined
 #endif
 
-#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX
+#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX || CFG_TUSB_MCU == OPT_MCU_NUC505
 #define CFG_TUSB_RHPORT0_MODE       (OPT_MODE_DEVICE | OPT_MODE_HIGH_SPEED)
 #else
 #define CFG_TUSB_RHPORT0_MODE       OPT_MODE_DEVICE
diff --git a/examples/device/midi_test/src/tusb_config.h b/examples/device/midi_test/src/tusb_config.h
index 5837db4eb..56f326f31 100644
--- a/examples/device/midi_test/src/tusb_config.h
+++ b/examples/device/midi_test/src/tusb_config.h
@@ -39,7 +39,7 @@
   #error CFG_TUSB_MCU must be defined
 #endif
 
-#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX
+#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX || CFG_TUSB_MCU == OPT_MCU_NUC505
 #define CFG_TUSB_RHPORT0_MODE       (OPT_MODE_DEVICE | OPT_MODE_HIGH_SPEED)
 #else
 #define CFG_TUSB_RHPORT0_MODE       OPT_MODE_DEVICE
diff --git a/examples/device/msc_dual_lun/src/tusb_config.h b/examples/device/msc_dual_lun/src/tusb_config.h
index baf857b71..82d07c60a 100644
--- a/examples/device/msc_dual_lun/src/tusb_config.h
+++ b/examples/device/msc_dual_lun/src/tusb_config.h
@@ -39,7 +39,7 @@
   #error CFG_TUSB_MCU must be defined
 #endif
 
-#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX
+#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX || CFG_TUSB_MCU == OPT_MCU_NUC505
 #define CFG_TUSB_RHPORT0_MODE       (OPT_MODE_DEVICE | OPT_MODE_HIGH_SPEED)
 #else
 #define CFG_TUSB_RHPORT0_MODE       OPT_MODE_DEVICE
diff --git a/examples/device/usbtmc/src/tusb_config.h b/examples/device/usbtmc/src/tusb_config.h
index 2932ea4d1..5dddc2c46 100644
--- a/examples/device/usbtmc/src/tusb_config.h
+++ b/examples/device/usbtmc/src/tusb_config.h
@@ -21,7 +21,7 @@
   #error CFG_TUSB_MCU must be defined
 #endif
 
-#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX
+#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX || CFG_TUSB_MCU == OPT_MCU_NUC505
 #define CFG_TUSB_RHPORT0_MODE       (OPT_MODE_DEVICE | OPT_MODE_HIGH_SPEED)
 #else
 #define CFG_TUSB_RHPORT0_MODE       OPT_MODE_DEVICE
diff --git a/examples/device/webusb_serial/src/tusb_config.h b/examples/device/webusb_serial/src/tusb_config.h
index 30acdaccf..b3f449f93 100644
--- a/examples/device/webusb_serial/src/tusb_config.h
+++ b/examples/device/webusb_serial/src/tusb_config.h
@@ -39,7 +39,7 @@
   #error CFG_TUSB_MCU must be defined
 #endif
 
-#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX
+#if CFG_TUSB_MCU == OPT_MCU_LPC43XX || CFG_TUSB_MCU == OPT_MCU_LPC18XX || CFG_TUSB_MCU == OPT_MCU_MIMXRT10XX || CFG_TUSB_MCU == OPT_MCU_NUC505
 #define CFG_TUSB_RHPORT0_MODE       (OPT_MODE_DEVICE | OPT_MODE_HIGH_SPEED)
 #else
 #define CFG_TUSB_RHPORT0_MODE       OPT_MODE_DEVICE
diff --git a/hw/bsp/nutiny_sdk_nuc505/board.mk b/hw/bsp/nutiny_sdk_nuc505/board.mk
new file mode 100644
index 000000000..259d11082
--- /dev/null
+++ b/hw/bsp/nutiny_sdk_nuc505/board.mk
@@ -0,0 +1,52 @@
+CFLAGS += \
+  -flto \
+  -mthumb \
+  -mabi=aapcs-linux \
+  -mcpu=cortex-m4 \
+  -DCFG_TUSB_MCU=OPT_MCU_NUC505
+
+# All source paths should be relative to the top level.
+LD_FILE = hw/bsp/nutiny_sdk_nuc505/nuc505_flashtoram.ld
+
+SRC_C += \
+  hw/mcu/nuvoton/nuc505/Device/Nuvoton/NUC505Series/Source/system_NUC505Series.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/adc.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/clk.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/gpio.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/i2c.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/i2s.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/pwm.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/rtc.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/sd.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/spi.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/spim.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/sys.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/timer.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/uart.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/usbd.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/wdt.c \
+  hw/mcu/nuvoton/nuc505/StdDriver/src/wwdt.c
+
+SRC_S += \
+  hw/mcu/nuvoton/nuc505/Device/Nuvoton/NUC505Series/Source/GCC/startup_NUC505Series.S
+
+INC += \
+  $(TOP)/hw/mcu/nuvoton/nuc505/Device/Nuvoton/NUC505Series/Include \
+  $(TOP)/hw/mcu/nuvoton/nuc505/StdDriver/inc \
+  $(TOP)/hw/mcu/nuvoton/nuc505/CMSIS/Include
+
+# For TinyUSB port source
+VENDOR = nuvoton
+CHIP_FAMILY = nuc505
+
+# For freeRTOS port source
+FREERTOS_PORT = ARM_CM4
+
+# For flash-jlink target
+JLINK_DEVICE = NUC505YO13Y
+JLINK_IF = swd
+
+# Flash using Nuvoton's openocd fork at https://github.com/OpenNuvoton/OpenOCD-Nuvoton
+# Please compile and install it from github source
+flash: $(BUILD)/$(BOARD)-firmware.elf
+	openocd -f interface/nulink.cfg -f target/numicroM4.cfg -c "program $< reset exit"
diff --git a/hw/bsp/nutiny_sdk_nuc505/nuc505_flashtoram.ld b/hw/bsp/nutiny_sdk_nuc505/nuc505_flashtoram.ld
new file mode 100644
index 000000000..53d385cd0
--- /dev/null
+++ b/hw/bsp/nutiny_sdk_nuc505/nuc505_flashtoram.ld
@@ -0,0 +1,199 @@
+/* Linker script to configure memory regions. */
+MEMORY
+{
+  FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 0x80000   /* 512k */
+  RAM (rwx)  : ORIGIN = 0x20000000, LENGTH = 0x20000   /* 128k */
+}
+
+/* Library configurations */
+GROUP(libgcc.a libc.a libm.a libnosys.a)
+
+/* Linker script to place sections and symbol values. Should be used together
+ * with other linker script that defines memory regions FLASH and RAM.
+ * It references following symbols, which must be defined in code:
+ *   Reset_Handler : Entry of reset handler
+ *
+ * It defines following symbols, which code can use without definition:
+ *   __exidx_start
+ *   __exidx_end
+ *   __copy_table_start__
+ *   __copy_table_end__
+ *   __zero_table_start__
+ *   __zero_table_end__
+ *   __etext
+ *   __data_start__
+ *   __preinit_array_start
+ *   __preinit_array_end
+ *   __init_array_start
+ *   __init_array_end
+ *   __fini_array_start
+ *   __fini_array_end
+ *   __data_end__
+ *   __bss_start__
+ *   __bss_end__
+ *   __end__
+ *   end
+ *   __HeapLimit
+ *   __StackLimit
+ *   __StackTop
+ *   __stack
+ *   __Vectors_End
+ *   __Vectors_Size
+ */
+ENTRY(Reset_Handler)
+
+SECTIONS
+{
+	.startup :
+	{
+		KEEP(*(.vectors))
+		__Vectors_End = .;
+		__Vectors_Size = __Vectors_End - __Vectors;
+		__end__ = .;
+
+		KEEP(*(.preinit))
+
+		KEEP(*(.init))
+		KEEP(*(.fini))
+
+	} > FLASH
+
+	.ARM.extab :
+	{
+		*(.ARM.extab* .gnu.linkonce.armextab.*)
+	} > FLASH
+
+	__exidx_start = .;
+	.ARM.exidx :
+	{
+		*(.ARM.exidx* .gnu.linkonce.armexidx.*)
+	} > FLASH
+	__exidx_end = .;
+
+	/* To copy multiple ROM to RAM sections,
+	 * uncomment .copy.table section and,
+	 * define __STARTUP_COPY_MULTIPLE in startup_ARMCMx.S */
+	/*
+	.copy.table :
+	{
+		. = ALIGN(4);
+		__copy_table_start__ = .;
+		LONG (__etext)
+		LONG (__data_start__)
+		LONG (__data_end__ - __data_start__)
+		LONG (__etext2)
+		LONG (__data2_start__)
+		LONG (__data2_end__ - __data2_start__)
+		__copy_table_end__ = .;
+	} > FLASH
+	*/
+
+	/* To clear multiple BSS sections,
+	 * uncomment .zero.table section and,
+	 * define __STARTUP_CLEAR_BSS_MULTIPLE in startup_ARMCMx.S */
+	/*
+	.zero.table :
+	{
+		. = ALIGN(4);
+		__zero_table_start__ = .;
+		LONG (__bss_start__)
+		LONG (__bss_end__ - __bss_start__)
+		LONG (__bss2_start__)
+		LONG (__bss2_end__ - __bss2_start__)
+		__zero_table_end__ = .;
+	} > FLASH
+	*/
+
+	__etext = .;
+
+	.data : AT (__etext)
+	{
+		__data_start__ = .;
+
+		*(.text*)
+
+		/* .ctors */
+		*crtbegin.o(.ctors)
+		*crtbegin?.o(.ctors)
+		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
+		*(SORT(.ctors.*))
+		*(.ctors)
+
+		/* .dtors */
+ 		*crtbegin.o(.dtors)
+ 		*crtbegin?.o(.dtors)
+ 		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
+ 		*(SORT(.dtors.*))
+ 		*(.dtors)
+
+		*(.rodata*)
+
+		KEEP(*(.eh_frame*))
+
+		*(vtable)
+		*(.data*)
+
+		. = ALIGN(4);
+		/* preinit data */
+		PROVIDE_HIDDEN (__preinit_array_start = .);
+		KEEP(*(.preinit_array))
+		PROVIDE_HIDDEN (__preinit_array_end = .);
+
+		. = ALIGN(4);
+		/* init data */
+		PROVIDE_HIDDEN (__init_array_start = .);
+		KEEP(*(SORT(.init_array.*)))
+		KEEP(*(.init_array))
+		PROVIDE_HIDDEN (__init_array_end = .);
+
+
+		. = ALIGN(4);
+		/* finit data */
+		PROVIDE_HIDDEN (__fini_array_start = .);
+		KEEP(*(SORT(.fini_array.*)))
+		KEEP(*(.fini_array))
+		PROVIDE_HIDDEN (__fini_array_end = .);
+
+		KEEP(*(.jcr*))
+		. = ALIGN(4);
+		/* All data end */
+		__data_end__ = .;
+
+	} > RAM
+
+	.bss :
+	{
+		. = ALIGN(4);
+		__bss_start__ = .;
+		*(.bss*)
+		*(COMMON)
+		. = ALIGN(4);
+		__bss_end__ = .;
+	} > RAM
+
+	.heap (COPY):
+	{
+		__HeapBase = .;
+		__end__ = .;
+		end = __end__;
+		KEEP(*(.heap*))
+		__HeapLimit = .;
+	} > RAM
+
+	/* .stack_dummy section doesn't contains any symbols. It is only
+	 * used for linker to calculate size of stack sections, and assign
+	 * values to stack symbols later */
+	.stack_dummy (COPY):
+	{
+		KEEP(*(.stack*))
+	} > RAM
+
+	/* Set stack top to end of RAM, and stack limit move down by
+	 * size of stack_dummy section */
+	__StackTop = ORIGIN(RAM) + LENGTH(RAM);
+	__StackLimit = __StackTop - SIZEOF(.stack_dummy);
+	PROVIDE(__stack = __StackTop);
+
+	/* Check if data + heap + stack exceeds RAM limit */
+	ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
+}
diff --git a/hw/bsp/nutiny_sdk_nuc505/nutiny_sdk_nuc505.c b/hw/bsp/nutiny_sdk_nuc505/nutiny_sdk_nuc505.c
new file mode 100644
index 000000000..3a341de9a
--- /dev/null
+++ b/hw/bsp/nutiny_sdk_nuc505/nutiny_sdk_nuc505.c
@@ -0,0 +1,118 @@
+/* 
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * 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.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#include "bsp/board.h"
+#include "NUC505Series.h"
+
+#define LED_PORT     PC
+#define LED_PIN      3
+#define LED_STATE_ON 0
+
+void board_init(void)
+{
+  /* Enable XTAL */
+  CLK->PWRCTL |= CLK_PWRCTL_HXTEN_Msk;
+
+  CLK_SetCoreClock(96000000);
+
+  /* Set PCLK divider */
+  CLK_SetModuleClock(PCLK_MODULE, 0, 1);
+
+  /* Update System Core Clock */
+  SystemCoreClockUpdate();
+
+  /* Enable USB IP clock */
+  CLK_EnableModuleClock(USBD_MODULE);
+
+  /* Select USB IP clock source */
+  CLK_SetModuleClock(USBD_MODULE, CLK_USBD_SRC_EXT, 0);
+
+  CLK_SetModuleClock(PCLK_MODULE, 0, 1);
+
+  /* Enable PHY */
+  USBD_ENABLE_PHY();
+  /* wait PHY clock ready */
+  while (1) {
+      USBD->EP[EPA].EPMPS = 0x20;
+      if (USBD->EP[EPA].EPMPS == 0x20)
+          break;
+  }
+
+  /* Force SE0, and then clear it to connect*/
+  USBD_SET_SE0();
+
+#if CFG_TUSB_OS  == OPT_OS_NONE
+  // 1ms tick timer
+  SysTick_Config(96000000 / 1000);
+#endif
+
+  GPIO_SetMode(LED_PORT, 1UL << LED_PIN, GPIO_MODE_OUTPUT);
+}
+
+#if CFG_TUSB_OS  == OPT_OS_NONE
+volatile uint32_t system_ticks = 0;
+void SysTick_Handler (void)
+{
+  system_ticks++;
+}
+
+uint32_t board_millis(void)
+{
+  return system_ticks;
+}
+#endif
+
+//--------------------------------------------------------------------+
+// Board porting API
+//--------------------------------------------------------------------+
+
+void board_led_write(bool state)
+{
+  uint32_t current = (state) ? LED_STATE_ON : (1-LED_STATE_ON);
+  current <<= LED_PIN;
+  uint32_t irq_state = __get_PRIMASK();
+  __disable_irq();
+  current |= LED_PORT->DOUT & ~(1UL << LED_PIN);
+  LED_PORT->DOUT = current;
+  __set_PRIMASK(irq_state);
+}
+
+uint32_t board_button_read(void)
+{
+  return 0;
+}
+
+int board_uart_read(uint8_t* buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
+
+int board_uart_write(void const * buf, int len)
+{
+  (void) buf; (void) len;
+  return 0;
+}
diff --git a/hw/mcu/nuvoton b/hw/mcu/nuvoton
-Subproject dc96fff794d14818c93ea1d4d760d51a014d70c
+Subproject 2204191ec76283371419fbcec207da02e1bc22f
diff --git a/src/portable/nuvoton/nuc505/dcd_nuc505.c b/src/portable/nuvoton/nuc505/dcd_nuc505.c
new file mode 100644
index 000000000..2b6a66bc2
--- /dev/null
+++ b/src/portable/nuvoton/nuc505/dcd_nuc505.c
@@ -0,0 +1,639 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Peter Lawrence
+ *
+ * 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.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+/*
+  Theory of operation:
+
+  The NUC505 USBD peripheral has twelve "EP"s, where each is simplex, in addition 
+  to dedicated support for the control endpoint (EP0).  The non-user endpoints
+  are referred to as "user" EPs in this code, and follow the datasheet 
+  nomenclature of EPA through EPL.
+*/
+
+#include "tusb_option.h"
+
+#if TUSB_OPT_DEVICE_ENABLED && (CFG_TUSB_MCU == OPT_MCU_NUC505)
+
+#include "device/dcd.h"
+#include "NUC505Series.h"
+
+/* rather important info unfortunately not provided by device include files */
+#define USBD_BUF_SIZE          2048 /* how much USB buffer space there is */
+#define USBD_MAX_DMA_LEN     0x1000 /* max bytes that can be DMAed at one time */
+
+enum ep_enum
+{
+  PERIPH_EPA = 0,
+  PERIPH_EPB = 1,
+  PERIPH_EPC = 2,
+  PERIPH_EPD = 3,
+  PERIPH_EPE = 4,
+  PERIPH_EPF = 5,
+  PERIPH_EPG = 6,
+  PERIPH_EPH = 7,
+  PERIPH_EPI = 8,
+  PERIPH_EPJ = 9,
+  PERIPH_EPK = 10,
+  PERIPH_EPL = 11,
+  PERIPH_MAX_EP,
+};
+
+static const uint8_t epcfg_eptype_table[] =
+{
+  [TUSB_XFER_CONTROL]     = 0, /* won't happen, since control EPs have dedicated registers */
+  [TUSB_XFER_ISOCHRONOUS] = 3 << USBD_EPCFG_EPTYPE_Pos,
+  [TUSB_XFER_BULK]        = 1 << USBD_EPCFG_EPTYPE_Pos,
+  [TUSB_XFER_INTERRUPT]   = 2 << USBD_EPCFG_EPTYPE_Pos,
+};
+
+static const uint8_t eprspctl_eptype_table[] =
+{
+  [TUSB_XFER_CONTROL]     = 0, /* won't happen, since control EPs have dedicated registers */
+  [TUSB_XFER_ISOCHRONOUS] = 2 << USBD_EPRSPCTL_MODE_Pos, /* Fly Mode */
+  [TUSB_XFER_BULK]        = 0 << USBD_EPRSPCTL_MODE_Pos, /* Auto-Validate Mode */
+  [TUSB_XFER_INTERRUPT]   = 1 << USBD_EPRSPCTL_MODE_Pos, /* Manual-Validate Mode */
+};
+
+/* set by dcd_set_address() */
+static volatile uint8_t assigned_address;
+
+/* reset by bus_reset(), this is used by dcd_edpt_open() to assign USBD peripheral buffer addresses */
+static uint32_t bufseg_addr;
+
+/* RAM table needed to track ongoing transfers performed by dcd_edpt_xfer(), dcd_userEP_in_xfer(), and the ISR */
+static struct xfer_ctl_t
+{
+  uint8_t *data_ptr;         /* data_ptr tracks where to next copy data to (for OUT) or from (for IN) */
+  union {
+    uint16_t in_remaining_bytes; /* for IN endpoints, we track how many bytes are left to transfer */
+    uint16_t out_bytes_so_far;   /* but for OUT endpoints, we track how many bytes we've transferred so far */
+  };
+  uint16_t max_packet_size;  /* needed since device driver only finds out this at runtime */
+  uint16_t total_bytes;      /* quantity needed to pass as argument to dcd_event_xfer_complete() (for IN endpoints) */
+  uint8_t ep_addr;
+  bool dma_requested;
+} xfer_table[PERIPH_MAX_EP];
+
+/* in addition to xfer_table, additional bespoke bookkeeping is maintained for control EP0 IN */
+static struct
+{
+  uint8_t *data_ptr;
+  uint16_t in_remaining_bytes;
+  uint16_t total_bytes;
+} ctrl_in_xfer;
+
+static volatile bool configuration_changed;
+
+static volatile struct xfer_ctl_t *current_dma_xfer;
+
+
+/*
+  local helper functions
+*/
+
+static void usb_attach(void)
+{
+  USBD->PHYCTL |= USBD_PHYCTL_DPPUEN_Msk;
+}
+
+static void usb_control_send_zlp(void)
+{
+  USBD->CEPINTSTS = USBD_CEPINTSTS_STSDONEIF_Msk;
+  USBD->CEPCTL = 0; /* clear NAKCLR bit */
+  USBD->CEPINTEN = USBD_CEPINTEN_STSDONEIEN_Msk;
+}
+
+/* map 8-bit ep_addr into peripheral endpoint index (PERIPH_EPA...) */
+static USBD_EP_T *ep_entry(uint8_t ep_addr, bool add)
+{
+  USBD_EP_T *ep;
+  enum ep_enum ep_index;
+  struct xfer_ctl_t *xfer;
+
+  for (ep_index = PERIPH_EPA, xfer = &xfer_table[PERIPH_EPA], ep = USBD->EP; ep_index < PERIPH_MAX_EP; ep_index++, xfer++, ep++)
+  {
+    if (add)
+    {
+      /* take first peripheral endpoint that is unused */
+      if (0 == (ep->EPCFG & USBD_EPCFG_EPEN_Msk)) return ep;
+    }
+    else
+    {
+      /* find a peripheral endpoint that matches ep_addr */
+      if (xfer->ep_addr == ep_addr) return ep;
+    }
+  }
+
+  return NULL;
+}
+
+/* perform a non-control IN endpoint transfer; this is called by the ISR  */
+static void dcd_userEP_in_xfer(struct xfer_ctl_t *xfer, USBD_EP_T *ep)
+{
+  uint16_t bytes_now = tu_min16(xfer->in_remaining_bytes, xfer->max_packet_size);
+  uint16_t countdown = bytes_now;
+
+  /* precompute what amount of data will be left */
+  xfer->in_remaining_bytes -= bytes_now;
+
+  /*
+  if there will be no more data to send, we replace the BUFEMPTYIF EP interrupt with TXPKIF;
+  that way, we alert TinyUSB as soon as this last packet has been sent
+  */
+  if (0 == xfer->in_remaining_bytes)
+  {
+    ep->EPINTSTS = USBD_EPINTSTS_TXPKIF_Msk;
+    ep->EPINTEN = USBD_EPINTEN_TXPKIEN_Msk;
+  }
+
+  /* provided buffers are thankfully 32-bit aligned, allowing most data to be transfered as 32-bit */
+  while (countdown > 3)
+  {
+    ep->EPDAT = *(uint32_t *)xfer->data_ptr;
+    xfer->data_ptr += 4; countdown -= 4;
+  }
+  while (countdown--)
+    ep->EPDAT_BYTE = *xfer->data_ptr++;
+
+  /* for short packets, we must nudge the peripheral to say 'that's all folks' */
+  if (bytes_now != xfer->max_packet_size)
+    ep->EPRSPCTL = USBD_EPRSPCTL_SHORTTXEN_Msk;
+}
+
+/* called by dcd_init() as well as by the ISR during a USB bus reset */
+static void bus_reset(void)
+{
+  for (enum ep_enum ep_index = PERIPH_EPA; ep_index < PERIPH_MAX_EP; ep_index++)
+  {
+    USBD->EP[ep_index].EPCFG = 0;
+    xfer_table[ep_index].dma_requested = false;
+  }
+
+  USBD->DMACNT = 0;
+  USBD->DMACTL = USBD_DMACTL_DMARST_Msk;
+  USBD->DMACTL = 0;
+
+  /* allocate the default EP0 endpoints */
+
+  USBD->CEPBUFSTART = 0;
+  USBD->CEPBUFEND = 0 + CFG_TUD_ENDPOINT0_SIZE - 1;
+
+  /* USB RAM beyond what we've allocated above is available to the user */
+  bufseg_addr = CFG_TUD_ENDPOINT0_SIZE;
+
+  /* Reset USB device address */
+  USBD->FADDR = 0;
+
+  configuration_changed = false;
+  current_dma_xfer = NULL;
+}
+
+/* this must only be called by the ISR; it does its best to share the single DMA engine across all user EPs (IN and OUT) */
+static void service_dma(void)
+{
+  if (current_dma_xfer)
+    return;
+
+  enum ep_enum ep_index;
+  struct xfer_ctl_t *xfer;
+  USBD_EP_T *ep;
+
+  for (ep_index = PERIPH_EPA, xfer = &xfer_table[PERIPH_EPA], ep = &USBD->EP[PERIPH_EPA]; ep_index < PERIPH_MAX_EP; ep_index++, xfer++, ep++)
+  {
+    uint16_t const available_bytes = ep->EPDATCNT & USBD_EPDATCNT_DATCNT_Msk;
+
+    if (!xfer->dma_requested || !available_bytes)
+      continue;
+
+    /*
+    instruct DMA to copy the data from the PC to the previously provided buffer
+    when the bus interrupt DMADONEIEN subsequently fires, the transfer will have finished
+    */
+    USBD->DMACTL = xfer->ep_addr & USBD_DMACTL_EPNUM_Msk;
+    USBD->DMAADDR = (uint32_t)xfer->data_ptr;
+    USBD->DMACNT = available_bytes;
+    USBD->BUSINTSTS = USBD_BUSINTSTS_DMADONEIF_Msk;
+    xfer->out_bytes_so_far += available_bytes;
+    current_dma_xfer = xfer;
+    USBD->DMACTL |= USBD_DMACTL_DMAEN_Msk;
+
+    return;
+  }
+}
+
+/* centralized location for USBD interrupt enable bit masks */
+static const uint32_t enabled_irqs = USBD_GINTEN_USBIEN_Msk | \
+  USBD_GINTEN_EPAIEN_Msk | USBD_GINTEN_EPBIEN_Msk | USBD_GINTEN_EPCIEN_Msk | USBD_GINTEN_EPDIEN_Msk | USBD_GINTEN_EPEIEN_Msk | USBD_GINTEN_EPFIEN_Msk | \
+  USBD_GINTEN_EPGIEN_Msk | USBD_GINTEN_EPHIEN_Msk | USBD_GINTEN_EPIIEN_Msk | USBD_GINTEN_EPJIEN_Msk | USBD_GINTEN_EPKIEN_Msk | USBD_GINTEN_EPLIEN_Msk | \
+  USBD_GINTEN_CEPIEN_Msk;
+
+/*
+  NUC505 TinyUSB API driver implementation
+*/
+
+void dcd_init(uint8_t rhport)
+{
+  (void) rhport;
+
+  /* configure interrupts in their initial state; BUSINTEN and CEPINTEN will be subsequently and dynamically re-written as needed */
+  USBD->GINTEN = enabled_irqs;
+  USBD->BUSINTEN = USBD_BUSINTEN_RSTIEN_Msk | USBD_BUSINTEN_VBUSDETIEN_Msk | USBD_BUSINTEN_RESUMEIEN_Msk | USBD_BUSINTEN_DMADONEIEN_Msk;
+  USBD->CEPINTEN = 0;
+
+  bus_reset();
+
+  usb_attach();
+}
+
+void dcd_int_enable(uint8_t rhport)
+{
+  (void) rhport;
+  NVIC_EnableIRQ(USBD_IRQn);
+}
+
+void dcd_int_disable(uint8_t rhport)
+{
+  (void) rhport;
+  NVIC_DisableIRQ(USBD_IRQn);
+}
+
+void dcd_set_address(uint8_t rhport, uint8_t dev_addr)
+{
+  (void) rhport;
+  usb_control_send_zlp(); /* SET_ADDRESS is the one exception where TinyUSB doesn't use dcd_edpt_xfer() to generate a ZLP */
+  assigned_address = dev_addr;
+}
+
+void dcd_set_config(uint8_t rhport, uint8_t config_num)
+{
+  (void) rhport;
+  (void) config_num;
+  configuration_changed = true;
+}
+
+void dcd_remote_wakeup(uint8_t rhport)
+{
+  (void) rhport;
+  USBD->OPER |= USBD_OPER_RESUMEEN_Msk;
+}
+
+bool dcd_edpt_open(uint8_t rhport, tusb_desc_endpoint_t const * p_endpoint_desc)
+{
+  (void) rhport;
+
+  USBD_EP_T *ep = ep_entry(p_endpoint_desc->bEndpointAddress, true);
+  TU_ASSERT(ep);
+
+  /* mine the data for the information we need */
+  int const dir = tu_edpt_dir(p_endpoint_desc->bEndpointAddress);
+  int const size = p_endpoint_desc->wMaxPacketSize.size;
+  tusb_xfer_type_t const type = p_endpoint_desc->bmAttributes.xfer;
+  struct xfer_ctl_t *xfer = &xfer_table[ep - USBD->EP];
+
+  /* allocate buffer from USB RAM */
+  ep->EPBUFSTART = bufseg_addr;
+  bufseg_addr += size;
+  ep->EPBUFEND = bufseg_addr - 1;
+  TU_ASSERT(bufseg_addr <= USBD_BUF_SIZE);
+
+  ep->EPMPS = size;
+
+  ep->EPRSPCTL = USB_EP_RSPCTL_FLUSH | eprspctl_eptype_table[type];
+
+  /* construct USB Configuration Register value and then write it */
+  uint32_t cfg = (uint32_t)tu_edpt_number(p_endpoint_desc->bEndpointAddress) << USBD_EPCFG_EPNUM_Pos;
+  if (TUSB_DIR_IN == dir)
+    cfg |= USBD_EPCFG_EPDIR_Msk;
+  cfg |= epcfg_eptype_table[type] | USBD_EPCFG_EPEN_Msk;
+  ep->EPCFG = cfg;
+
+  /* make a note of the endpoint particulars */
+  xfer->max_packet_size = size;
+  xfer->ep_addr = p_endpoint_desc->bEndpointAddress;
+
+  return true;
+}
+
+bool dcd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t *buffer, uint16_t total_bytes)
+{
+  (void) rhport;
+
+  if (0x80 == ep_addr) /* control EP0 IN */
+  {
+    if (total_bytes)
+    {
+      USBD->CEPCTL = USBD_CEPCTL_FLUSH_Msk;
+      ctrl_in_xfer.data_ptr = buffer;
+      ctrl_in_xfer.in_remaining_bytes = total_bytes;
+      ctrl_in_xfer.total_bytes = total_bytes;
+      USBD->CEPINTSTS = USBD_CEPINTSTS_INTKIF_Msk;
+      USBD->CEPINTEN = USBD_CEPINTEN_INTKIEN_Msk;
+    }
+    else
+    {
+      usb_control_send_zlp();
+    }
+  }
+  else if (0x00 == ep_addr) /* control EP0 OUT */
+  {
+    if (total_bytes)
+    {
+      /* if TinyUSB is asking for EP0 OUT data, it is almost certainly already in the buffer */
+      while (total_bytes < USBD->CEPRXCNT);
+      for (int count = 0; count < total_bytes; count++)
+        *buffer++ = USBD->CEPDAT_BYTE;
+      
+      usb_control_send_zlp();
+    }
+  }
+  else
+  {
+    /* mine the data for the information we need */
+    tusb_dir_t dir = tu_edpt_dir(ep_addr);
+    USBD_EP_T *ep = ep_entry(ep_addr, false);
+    struct xfer_ctl_t *xfer = &xfer_table[ep - USBD->EP];
+
+    /* store away the information we'll needing now and later */
+    xfer->data_ptr = buffer;
+    xfer->in_remaining_bytes = total_bytes;
+    xfer->total_bytes = total_bytes;
+
+    if (TUSB_DIR_IN == dir)
+    {
+      ep->EPINTEN = USBD_EPINTEN_BUFEMPTYIEN_Msk;
+    }
+    else
+    {
+      xfer->out_bytes_so_far = 0;
+      ep->EPINTEN = USBD_EPINTEN_RXPKIEN_Msk;
+    }
+  }
+
+  return true;
+}
+
+void dcd_edpt_stall(uint8_t rhport, uint8_t ep_addr)
+{
+  (void) rhport;
+
+  if (tu_edpt_number(ep_addr))
+  {
+    USBD_EP_T *ep = ep_entry(ep_addr, false);
+    ep->EPRSPCTL = (ep->EPRSPCTL & 0xf7) | USBD_EPRSPCTL_HALT_Msk;
+  }
+  else
+  {
+    USBD->CEPCTL = USBD_CEPCTL_STALLEN_Msk;
+  }
+}
+
+void dcd_edpt_clear_stall(uint8_t rhport, uint8_t ep_addr)
+{
+  (void) rhport;
+
+  if (tu_edpt_number(ep_addr))
+  {
+    USBD_EP_T *ep = ep_entry(ep_addr, false);
+    ep->EPRSPCTL = USBD_EPRSPCTL_TOGGLE_Msk;
+  }
+}
+
+void USBD_IRQHandler(void)
+{
+  uint32_t status = USBD->GINTSTS;
+
+  /* USB interrupt */
+  if (status & USBD_GINTSTS_USBIF_Msk)
+  {
+    uint32_t bus_state = USBD->BUSINTSTS;
+
+    if (bus_state & USBD_BUSINTSTS_SOFIF_Msk)
+    {
+      /* Start-Of-Frame event */
+      dcd_event_bus_signal(0, DCD_EVENT_SOF, true);
+    }
+
+    if (bus_state & USBD_BUSINTSTS_RSTIF_Msk)
+    {
+      bus_reset();
+
+      USBD->CEPINTEN = USBD_CEPINTEN_SETUPPKIEN_Msk;
+      USBD->BUSINTEN = USBD_BUSINTEN_RSTIEN_Msk | USBD_BUSINTEN_RESUMEIEN_Msk | USBD_BUSINTEN_SUSPENDIEN_Msk | USBD_BUSINTEN_DMADONEIEN_Msk;
+      USBD->CEPINTSTS = 0x1ffc;
+      dcd_event_bus_signal(0, DCD_EVENT_BUS_RESET, true);
+    }
+
+    if (bus_state & USBD_BUSINTSTS_RESUMEIF_Msk)
+    {
+      USBD->BUSINTEN = USBD_BUSINTEN_RSTIEN_Msk | USBD_BUSINTEN_SUSPENDIEN_Msk | USBD_BUSINTEN_DMADONEIEN_Msk;
+      dcd_event_bus_signal(0, DCD_EVENT_RESUME, true);
+    }
+
+    if (bus_state & USBD_BUSINTSTS_SUSPENDIF_Msk)
+    {
+      USBD->BUSINTEN = USBD_BUSINTEN_RSTIEN_Msk | USBD_BUSINTEN_RESUMEIEN_Msk | USBD_BUSINTEN_DMADONEIEN_Msk;
+      dcd_event_bus_signal(0, DCD_EVENT_SUSPEND, true);
+    }
+
+    if (bus_state & USBD_BUSINTSTS_HISPDIF_Msk)
+    {
+      USBD->CEPINTEN = USBD_CEPINTEN_SETUPPKIEN_Msk;
+    }
+
+    if (bus_state & USBD_BUSINTSTS_DMADONEIF_Msk)
+    {
+      if (current_dma_xfer)
+      {
+        current_dma_xfer->dma_requested = false;
+
+        uint16_t available_bytes = USBD->DMACNT & USBD_DMACNT_DMACNT_Msk;
+
+        /* if the most recent DMA finishes the transfer, alert TinyUSB; otherwise, the next RXPKIF/INTKIF endpoint interrupt will prompt the next DMA */
+        if ( (current_dma_xfer->total_bytes == current_dma_xfer->out_bytes_so_far) || (available_bytes < current_dma_xfer->max_packet_size) )
+        {
+          dcd_event_xfer_complete(0, current_dma_xfer->ep_addr, current_dma_xfer->out_bytes_so_far, XFER_RESULT_SUCCESS, true);
+        }
+
+        current_dma_xfer = NULL;
+        service_dma();
+      }
+    }
+
+    if (bus_state & USBD_BUSINTSTS_VBUSDETIF_Msk)
+    {
+      if (USBD->PHYCTL & USBD_PHYCTL_VBUSDET_Msk)
+      {
+        /* USB connect */
+        USBD->PHYCTL |= USBD_PHYCTL_PHYEN_Msk | USBD_PHYCTL_DPPUEN_Msk;
+      }
+      else
+      {
+        /* USB disconnect */
+        USBD->PHYCTL &= ~USBD_PHYCTL_DPPUEN_Msk;
+      }
+    }
+
+    USBD->BUSINTSTS = bus_state & (USBD_BUSINTSTS_SOFIF_Msk | USBD_BUSINTSTS_RSTIF_Msk | USBD_BUSINTSTS_RESUMEIF_Msk | USBD_BUSINTSTS_SUSPENDIF_Msk | USBD_BUSINTSTS_HISPDIF_Msk | USBD_BUSINTSTS_DMADONEIF_Msk | USBD_BUSINTSTS_PHYCLKVLDIF_Msk | USBD_BUSINTSTS_VBUSDETIF_Msk);
+  }
+
+  if (status & USBD_GINTSTS_CEPIF_Msk)
+  {
+    uint32_t cep_state = USBD->CEPINTSTS & USBD->CEPINTEN;
+
+    if (cep_state & USBD_CEPINTSTS_SETUPPKIF_Msk)
+    {
+      /* get SETUP packet from USB buffer */
+      uint8_t setup_packet[8];
+      setup_packet[0] = (uint8_t)(USBD->SETUP1_0 >> 0);
+      setup_packet[1] = (uint8_t)(USBD->SETUP1_0 >> 8);
+      setup_packet[2] = (uint8_t)(USBD->SETUP3_2 >> 0);
+      setup_packet[3] = (uint8_t)(USBD->SETUP3_2 >> 8);
+      setup_packet[4] = (uint8_t)(USBD->SETUP5_4 >> 0);
+      setup_packet[5] = (uint8_t)(USBD->SETUP5_4 >> 8);
+      setup_packet[6] = (uint8_t)(USBD->SETUP7_6 >> 0);
+      setup_packet[7] = (uint8_t)(USBD->SETUP7_6 >> 8);
+      dcd_event_setup_received(0, setup_packet, true);
+    }
+    else if (cep_state & USBD_CEPINTSTS_INTKIF_Msk)
+    {
+      USBD->CEPINTSTS = USBD_CEPINTSTS_TXPKIF_Msk;
+
+      if (!(cep_state & USBD_CEPINTSTS_STSDONEIF_Msk))
+      {
+        USBD->CEPINTEN = USBD_CEPINTEN_TXPKIEN_Msk;
+        uint16_t bytes_now = tu_min16(ctrl_in_xfer.in_remaining_bytes, CFG_TUD_ENDPOINT0_SIZE);
+        for (int count = 0; count < bytes_now; count++)
+          USBD->CEPDAT_BYTE = *ctrl_in_xfer.data_ptr++;
+        ctrl_in_xfer.in_remaining_bytes -= bytes_now;
+        USBD_START_CEP_IN(bytes_now);
+      }
+      else
+      {
+        USBD->CEPINTEN = USBD_CEPINTEN_TXPKIEN_Msk | USBD_CEPINTEN_STSDONEIEN_Msk;
+      }
+    }
+    else if (cep_state & USBD_CEPINTSTS_TXPKIF_Msk)
+    {
+      USBD->CEPINTSTS = USBD_CEPINTSTS_STSDONEIF_Msk;
+      USBD_SET_CEP_STATE(USB_CEPCTL_NAKCLR);
+
+      /* alert TinyUSB that the EP0 IN transfer has finished */
+      if ( (0 == ctrl_in_xfer.in_remaining_bytes) || (0 == ctrl_in_xfer.total_bytes) )
+        dcd_event_xfer_complete(0, 0x80, ctrl_in_xfer.total_bytes, XFER_RESULT_SUCCESS, true);
+
+      if (ctrl_in_xfer.in_remaining_bytes)
+      {
+        USBD->CEPINTSTS = USBD_CEPINTSTS_INTKIF_Msk;
+        USBD->CEPINTEN = USBD_CEPINTEN_INTKIEN_Msk;
+      }
+      else
+      {
+        /* TinyUSB does its own fragmentation and ZLP for EP0; a transfer of zero means a ZLP */
+        if (0 == ctrl_in_xfer.total_bytes) USBD->CEPCTL = USBD_CEPCTL_ZEROLEN_Msk;
+
+        USBD->CEPINTSTS = USBD_CEPINTSTS_STSDONEIF_Msk;
+        USBD->CEPINTEN = USBD_CEPINTEN_SETUPPKIEN_Msk | USBD_CEPINTEN_STSDONEIEN_Msk;
+      }
+    }
+    else if (cep_state & USBD_CEPINTSTS_STSDONEIF_Msk)
+    {
+      /* given ACK from host has happened, we can now set the address (if not already done) */
+      if((USBD->FADDR != assigned_address) && (USBD->FADDR == 0)) USBD->FADDR = assigned_address;
+
+      if (configuration_changed)
+      {
+        for (enum ep_enum ep_index = PERIPH_EPA; ep_index < PERIPH_MAX_EP; ep_index++)
+        {
+          if (USBD->EP[ep_index].EPCFG & USBD_EPCFG_EPEN_Msk) USBD->EP[ep_index].EPRSPCTL = USBD_EPRSPCTL_TOGGLE_Msk;
+        }
+        configuration_changed = false;
+      }
+
+      USBD->CEPINTEN = USBD_CEPINTEN_SETUPPKIEN_Msk;
+    }
+
+    USBD->CEPINTSTS = cep_state;
+
+    return;
+  }
+
+  if (status & (USBD_GINTSTS_EPAIF_Msk | USBD_GINTSTS_EPBIF_Msk | USBD_GINTSTS_EPCIF_Msk | USBD_GINTSTS_EPDIF_Msk | USBD_GINTSTS_EPEIF_Msk | USBD_GINTSTS_EPFIF_Msk | USBD_GINTSTS_EPGIF_Msk | USBD_GINTSTS_EPHIF_Msk | USBD_GINTSTS_EPIIF_Msk | USBD_GINTSTS_EPJIF_Msk | USBD_GINTSTS_EPKIF_Msk | USBD_GINTSTS_EPLIF_Msk))
+  {
+    /* service PERIPH_EPA through PERIPH_EPL */
+    enum ep_enum ep_index;
+    uint32_t mask;
+    struct xfer_ctl_t *xfer;
+    USBD_EP_T *ep;
+    for (ep_index = PERIPH_EPA, mask = USBD_GINTSTS_EPAIF_Msk, xfer = &xfer_table[PERIPH_EPA], ep = &USBD->EP[PERIPH_EPA]; ep_index < PERIPH_MAX_EP; ep_index++, mask <<= 1, xfer++, ep++)
+    {
+      if(status & mask)
+      {
+        uint8_t const ep_addr = xfer->ep_addr;
+        bool const out_ep = !(ep_addr & TUSB_DIR_IN_MASK);
+        uint32_t ep_state = ep->EPINTSTS & ep->EPINTEN;
+
+        if (out_ep)
+        {
+#if 1
+          xfer->dma_requested = true;
+          service_dma();
+#else
+          uint16_t const available_bytes = ep->EPDATCNT & USBD_EPDATCNT_DATCNT_Msk;
+          /* copy the data from the PC to the previously provided buffer */
+          for (int count = 0; (count < available_bytes) && (xfer->out_bytes_so_far < xfer->total_bytes); count++, xfer->out_bytes_so_far++)
+            *xfer->data_ptr++ = ep->EPDAT_BYTE;
+
+          /* when the transfer is finished, alert TinyUSB; otherwise, continue accepting more data */
+          if ( (xfer->total_bytes == xfer->out_bytes_so_far) || (available_bytes < xfer->max_packet_size) )
+            dcd_event_xfer_complete(0, ep_addr, xfer->out_bytes_so_far, XFER_RESULT_SUCCESS, true);
+#endif
+
+        }
+        else if (ep_state & USBD_EPINTSTS_BUFEMPTYIF_Msk)
+        {
+          /* send any remaining data */
+          dcd_userEP_in_xfer(xfer, ep);
+        }
+        else if (ep_state & USBD_EPINTSTS_TXPKIF_Msk)
+        {
+          /* alert TinyUSB that we've finished */
+          dcd_event_xfer_complete(0, ep_addr, xfer->total_bytes, XFER_RESULT_SUCCESS, true);
+          ep->EPINTEN = 0;
+        }
+
+        ep->EPINTSTS = ep_state;
+      }
+    }
+  }
+}
+
+void dcd_isr(uint8_t rhport)
+{
+  (void) rhport;
+  USBD_IRQHandler();
+}
+
+#endif
diff --git a/src/tusb_option.h b/src/tusb_option.h
index 97f14532f..eb524d55b 100644
--- a/src/tusb_option.h
+++ b/src/tusb_option.h
@@ -79,6 +79,7 @@
 
 #define OPT_MCU_NUC121            800
 #define OPT_MCU_NUC126            801
+#define OPT_MCU_NUC505            803
 
 #define OPT_MCU_ESP32S2           900 ///< Espressif ESP32-S2