Merge pull request #7 from tannewt/tinyusb_samd

Add SAMD support and simplify OS_NONE

4 files changed, 871 insertions, 0 deletions

diff --git a/src/portable/microchip/samd21/dcd.c b/src/portable/microchip/samd21/dcd.c
new file mode 100644
index 000000000..33cbc8d92
--- /dev/null
+++ b/src/portable/microchip/samd21/dcd.c
@@ -0,0 +1,341 @@
+/**************************************************************************/
+/*!
+    @file     dcd_nrf5x.c
+    @author   hathach
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, Scott Shawcroft for Adafruit Industries
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+    This file is part of the tinyusb stack.
+*/
+/**************************************************************************/
+
+#include "tusb_option.h"
+
+#if TUSB_OPT_DEVICE_ENABLED && CFG_TUSB_MCU == OPT_MCU_SAMD21
+
+#include "device/dcd.h"
+
+#include "device/usbd.h"
+#include "device/usbd_pvt.h" // to use defer function helper
+
+#include "class/msc/msc_device.h"
+
+#include "sam.h"
+
+/*------------------------------------------------------------------*/
+/* MACRO TYPEDEF CONSTANT ENUM
+ *------------------------------------------------------------------*/
+enum
+{
+  // Max allowed by USB specs
+  MAX_PACKET_SIZE   = 64,
+};
+
+UsbDeviceDescBank sram_registers[8][2];
+ATTR_ALIGNED(4) uint8_t control_out_buffer[64];
+ATTR_ALIGNED(4) uint8_t control_in_buffer[64];
+
+volatile uint32_t setup_count = 0;
+
+// Setup the control endpoint 0.
+static void bus_reset(void) {
+    // Max size of packets is 64 bytes.
+    UsbDeviceDescBank* bank_out = &sram_registers[0][TUSB_DIR_OUT];
+    bank_out->PCKSIZE.bit.SIZE = 0x3;
+    UsbDeviceDescBank* bank_in = &sram_registers[0][TUSB_DIR_IN];
+    bank_in->PCKSIZE.bit.SIZE = 0x3;
+
+    UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[0];
+    ep->EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE0(0x1) | USB_DEVICE_EPCFG_EPTYPE1(0x1);
+    ep->EPINTENSET.reg = USB_DEVICE_EPINTENSET_TRCPT0 | USB_DEVICE_EPINTENSET_TRCPT1 | USB_DEVICE_EPINTENSET_RXSTP;
+
+    dcd_edpt_xfer(0, 0, control_out_buffer, 64);
+    setup_count = 0;
+}
+
+
+/*------------------------------------------------------------------*/
+/* Controller API
+ *------------------------------------------------------------------*/
+bool dcd_init (uint8_t rhport)
+{
+  (void) rhport;
+  USB->DEVICE.DESCADD.reg = (uint32_t) &sram_registers;
+  USB->DEVICE.CTRLB.reg = USB_DEVICE_CTRLB_SPDCONF_FS;
+  USB->DEVICE.CTRLA.reg = USB_CTRLA_MODE_DEVICE | USB_CTRLA_ENABLE;
+  USB->DEVICE.INTENSET.reg = USB_DEVICE_INTENSET_SOF | USB_DEVICE_INTENSET_EORST;
+
+  return true;
+}
+
+void dcd_connect (uint8_t rhport)
+{
+
+}
+void dcd_disconnect (uint8_t rhport)
+{
+
+}
+
+void dcd_set_address (uint8_t rhport, uint8_t dev_addr)
+{
+  (void) rhport;
+  dcd_edpt_xfer (0, TUSB_DIR_IN_MASK, NULL, 0);
+  // Wait for EP0 to finish before switching the address.
+  while (USB->DEVICE.DeviceEndpoint[0].EPSTATUS.bit.BK1RDY == 1) {}
+  USB->DEVICE.DADD.reg = USB_DEVICE_DADD_DADD(dev_addr) | USB_DEVICE_DADD_ADDEN;
+}
+
+void dcd_set_config (uint8_t rhport, uint8_t config_num)
+{
+  (void) rhport;
+  (void) config_num;
+  // Nothing to do
+}
+
+/*------------------------------------------------------------------*/
+/* Control
+ *------------------------------------------------------------------*/
+
+bool dcd_control_xfer (uint8_t rhport, uint8_t dir, uint8_t * buffer, uint16_t length)
+{
+  (void) rhport;
+  uint8_t ep_addr = 0;
+  if (dir == TUSB_DIR_IN) {
+      ep_addr |= TUSB_DIR_IN_MASK;
+  }
+
+  return dcd_edpt_xfer (rhport, ep_addr, buffer, length);
+}
+
+bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
+{
+  (void) rhport;
+
+  uint8_t const epnum = edpt_number(desc_edpt->bEndpointAddress);
+  uint8_t const dir   = edpt_dir(desc_edpt->bEndpointAddress);
+
+  UsbDeviceDescBank* bank = &sram_registers[epnum][dir];
+  uint32_t size_value = 0;
+  while (size_value < 7) {
+    if (1 << (size_value + 3) == desc_edpt->wMaxPacketSize.size) {
+      break;
+    }
+    size_value++;
+  }
+  bank->PCKSIZE.bit.SIZE = size_value;
+
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+  if ( dir == TUSB_DIR_OUT )
+  {
+    ep->EPCFG.bit.EPTYPE0 = desc_edpt->bmAttributes.xfer + 1;
+    ep->EPINTENSET.bit.TRCPT0 = true;
+  }else
+  {
+    ep->EPCFG.bit.EPTYPE1 = desc_edpt->bmAttributes.xfer + 1;
+    ep->EPINTENSET.bit.TRCPT1 = true;
+  }
+  __ISB(); __DSB();
+
+  return true;
+}
+
+bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes)
+{
+  (void) rhport;
+
+  uint8_t const epnum = edpt_number(ep_addr);
+  uint8_t const dir   = edpt_dir(ep_addr);
+
+  UsbDeviceDescBank* bank = &sram_registers[epnum][dir];
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+  bank->ADDR.reg = (uint32_t) buffer;
+  if ( dir == TUSB_DIR_OUT )
+  {
+    bank->PCKSIZE.bit.MULTI_PACKET_SIZE = total_bytes;
+    bank->PCKSIZE.bit.BYTE_COUNT = 0;
+    ep->EPSTATUSCLR.reg |= USB_DEVICE_EPSTATUSCLR_BK0RDY;
+    ep->EPINTFLAG.reg |= USB_DEVICE_EPINTFLAG_TRFAIL0;
+  } else
+  {
+    bank->PCKSIZE.bit.MULTI_PACKET_SIZE = 0;
+    bank->PCKSIZE.bit.BYTE_COUNT = total_bytes;
+    // bank->PCKSIZE.bit.AUTO_ZLP = 1;
+    ep->EPSTATUSSET.reg |= USB_DEVICE_EPSTATUSSET_BK1RDY;
+    ep->EPINTFLAG.reg |= USB_DEVICE_EPINTFLAG_TRFAIL1;
+  }
+
+  return true;
+}
+
+bool dcd_edpt_stalled (uint8_t rhport, uint8_t ep_addr)
+{
+  (void) rhport;
+
+  // control is never got halted
+  if ( ep_addr == 0 ) {
+      return false;
+  }
+
+  uint8_t const epnum = edpt_number(ep_addr);
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+  return (edpt_dir(ep_addr) == TUSB_DIR_IN ) ? ep->EPINTFLAG.bit.STALL1 : ep->EPINTFLAG.bit.STALL0;
+}
+
+void dcd_edpt_stall (uint8_t rhport, uint8_t ep_addr)
+{
+  (void) rhport;
+
+  uint8_t const epnum = edpt_number(ep_addr);
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+  if (edpt_dir(ep_addr) == TUSB_DIR_IN) {
+      ep->EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_STALLRQ1;
+  } else {
+      ep->EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_STALLRQ0;
+  }
+
+  __ISB(); __DSB();
+}
+
+void dcd_edpt_clear_stall (uint8_t rhport, uint8_t ep_addr)
+{
+  (void) rhport;
+
+  uint8_t const epnum = edpt_number(ep_addr);
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+  if (edpt_dir(ep_addr) == TUSB_DIR_IN) {
+    ep->EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ1;
+  } else {
+    ep->EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ0;
+  }
+}
+
+bool dcd_edpt_busy (uint8_t rhport, uint8_t ep_addr)
+{
+  (void) rhport;
+
+  // USBD shouldn't check control endpoint state
+  if ( 0 == ep_addr ) return false;
+
+  uint8_t const epnum = edpt_number(ep_addr);
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+  if (edpt_dir(ep_addr) == TUSB_DIR_IN) {
+    return ep->EPINTFLAG.bit.TRCPT1 == 0 && ep->EPSTATUS.bit.BK1RDY == 1;
+  }
+  return ep->EPINTFLAG.bit.TRCPT0 == 0 && ep->EPSTATUS.bit.BK0RDY == 1;
+}
+
+/*------------------------------------------------------------------*/
+
+static bool maybe_handle_setup_packet(void) {
+    if (USB->DEVICE.DeviceEndpoint[0].EPINTFLAG.bit.RXSTP)
+    {
+        USB->DEVICE.DeviceEndpoint[0].EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_RXSTP;
+
+        // This copies the data elsewhere so we can reuse the buffer.
+        dcd_event_setup_received(0, (uint8_t*) sram_registers[0][0].ADDR.reg, true);
+        dcd_edpt_xfer(0, 0, control_out_buffer, 64);
+        setup_count += 1;
+        return true;
+    }
+    return false;
+}
+
+void maybe_transfer_complete(void) {
+    uint32_t epints = USB->DEVICE.EPINTSMRY.reg;
+    for (uint8_t epnum = 0; epnum < USB_EPT_NUM; epnum++) {
+        if ((epints & (1 << epnum)) == 0) {
+            continue;
+        }
+
+        if (maybe_handle_setup_packet()) {
+            continue;
+        }
+        UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+        uint32_t epintflag = ep->EPINTFLAG.reg;
+
+        // Handle IN completions
+        if ((epintflag & USB_DEVICE_EPINTFLAG_TRCPT1) != 0) {
+            ep->EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT1;
+
+            UsbDeviceDescBank* bank = &sram_registers[epnum][TUSB_DIR_IN];
+            uint16_t total_transfer_size = bank->PCKSIZE.bit.BYTE_COUNT;
+
+            uint8_t ep_addr = epnum | TUSB_DIR_IN_MASK;
+            dcd_event_xfer_complete(0, ep_addr, total_transfer_size, DCD_XFER_SUCCESS, true);
+        }
+
+        // Handle OUT completions
+        if ((epintflag & USB_DEVICE_EPINTFLAG_TRCPT0) != 0) {
+            ep->EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT0;
+
+            UsbDeviceDescBank* bank = &sram_registers[epnum][TUSB_DIR_OUT];
+            uint16_t total_transfer_size = bank->PCKSIZE.bit.BYTE_COUNT;
+
+            uint8_t ep_addr = epnum;
+            dcd_event_xfer_complete(0, ep_addr, total_transfer_size, DCD_XFER_SUCCESS, true);
+            if (epnum == 0) {
+                dcd_edpt_xfer(0, 0, control_out_buffer, 64);
+            }
+        }
+    }
+}
+
+void USB_Handler(void) {
+  uint32_t int_status = USB->DEVICE.INTFLAG.reg;
+
+  /*------------- Interrupt Processing -------------*/
+  if ( int_status & USB_DEVICE_INTFLAG_EORST )
+  {
+    USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTENCLR_EORST;
+    bus_reset();
+    dcd_event_bus_signal(0, DCD_EVENT_BUS_RESET, true);
+  }
+
+  if ( int_status & USB_DEVICE_INTFLAG_SOF )
+  {
+    USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTFLAG_SOF;
+    dcd_event_bus_signal(0, DCD_EVENT_SOF, true);
+  }
+
+  // Setup packet received.
+  maybe_handle_setup_packet();
+
+  // Handle complete transfer
+  maybe_transfer_complete();
+}
+
+#endif
diff --git a/src/portable/microchip/samd21/hal.c b/src/portable/microchip/samd21/hal.c
new file mode 100644
index 000000000..524840be2
--- /dev/null
+++ b/src/portable/microchip/samd21/hal.c
@@ -0,0 +1,82 @@
+/**************************************************************************/
+/*!
+    @file     hal_nrf5x.c
+    @author   hathach
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, hathach (tinyusb.org)
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+    This file is part of the tinyusb stack.
+*/
+/**************************************************************************/
+
+#include "tusb_option.h"
+
+#if TUSB_OPT_DEVICE_ENABLED && CFG_TUSB_MCU == OPT_MCU_SAMD21
+
+#include "sam.h"
+
+#include "tusb_hal.h"
+
+/*------------------------------------------------------------------*/
+/* MACRO TYPEDEF CONSTANT ENUM
+ *------------------------------------------------------------------*/
+#define USB_NVIC_PRIO   7
+
+void tusb_hal_nrf_power_event(uint32_t event);
+
+/*------------------------------------------------------------------*/
+/* TUSB HAL
+ *------------------------------------------------------------------*/
+bool tusb_hal_init(void)
+{
+  USB->DEVICE.PADCAL.bit.TRANSP = (*((uint32_t*) USB_FUSES_TRANSP_ADDR) & USB_FUSES_TRANSP_Msk) >> USB_FUSES_TRANSP_Pos;
+  USB->DEVICE.PADCAL.bit.TRANSN = (*((uint32_t*) USB_FUSES_TRANSN_ADDR) & USB_FUSES_TRANSN_Msk) >> USB_FUSES_TRANSN_Pos;
+  USB->DEVICE.PADCAL.bit.TRIM = (*((uint32_t*) USB_FUSES_TRIM_ADDR) & USB_FUSES_TRIM_Msk) >> USB_FUSES_TRIM_Pos;
+
+  USB->DEVICE.QOSCTRL.bit.CQOS = USB_QOSCTRL_CQOS_HIGH_Val;
+  USB->DEVICE.QOSCTRL.bit.DQOS = USB_QOSCTRL_DQOS_HIGH_Val;
+
+  tusb_hal_int_enable(0);
+  return true;
+}
+
+void tusb_hal_int_enable(uint8_t rhport)
+{
+  (void) rhport;
+  NVIC_EnableIRQ(USB_IRQn);
+}
+
+void tusb_hal_int_disable(uint8_t rhport)
+{
+  (void) rhport;
+  NVIC_DisableIRQ(USB_IRQn);
+}
+
+#endif
diff --git a/src/portable/microchip/samd51/dcd.c b/src/portable/microchip/samd51/dcd.c
new file mode 100644
index 000000000..e67fbd295
--- /dev/null
+++ b/src/portable/microchip/samd51/dcd.c
@@ -0,0 +1,360 @@
+/**************************************************************************/
+/*!
+    @file     dcd_nrf5x.c
+    @author   hathach
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, Scott Shawcroft for Adafruit Industries
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+    This file is part of the tinyusb stack.
+*/
+/**************************************************************************/
+
+#include "tusb_option.h"
+
+#if TUSB_OPT_DEVICE_ENABLED && CFG_TUSB_MCU == OPT_MCU_SAMD51
+
+#include "device/dcd.h"
+
+#include "device/usbd.h"
+#include "device/usbd_pvt.h" // to use defer function helper
+
+#include "sam.h"
+
+/*------------------------------------------------------------------*/
+/* MACRO TYPEDEF CONSTANT ENUM
+ *------------------------------------------------------------------*/
+enum
+{
+  // Max allowed by USB specs
+  MAX_PACKET_SIZE   = 64,
+};
+
+UsbDeviceDescBank sram_registers[8][2];
+ATTR_ALIGNED(4) uint8_t control_out_buffer[64];
+ATTR_ALIGNED(4) uint8_t control_in_buffer[64];
+
+volatile uint32_t setup_count = 0;
+
+// Setup the control endpoint 0.
+static void bus_reset(void) {
+    // Max size of packets is 64 bytes.
+    UsbDeviceDescBank* bank_out = &sram_registers[0][TUSB_DIR_OUT];
+    bank_out->PCKSIZE.bit.SIZE = 0x3;
+    UsbDeviceDescBank* bank_in = &sram_registers[0][TUSB_DIR_IN];
+    bank_in->PCKSIZE.bit.SIZE = 0x3;
+
+    UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[0];
+    ep->EPCFG.reg = USB_DEVICE_EPCFG_EPTYPE0(0x1) | USB_DEVICE_EPCFG_EPTYPE1(0x1);
+    ep->EPINTENSET.reg = USB_DEVICE_EPINTENSET_TRCPT0 | USB_DEVICE_EPINTENSET_TRCPT1 | USB_DEVICE_EPINTENSET_RXSTP;
+
+    dcd_edpt_xfer(0, 0, control_out_buffer, 64);
+    setup_count = 0;
+}
+
+
+/*------------------------------------------------------------------*/
+/* Controller API
+ *------------------------------------------------------------------*/
+bool dcd_init (uint8_t rhport)
+{
+  (void) rhport;
+  USB->DEVICE.DESCADD.reg = (uint32_t) &sram_registers;
+  USB->DEVICE.CTRLB.reg = USB_DEVICE_CTRLB_SPDCONF_FS;
+  USB->DEVICE.CTRLA.reg = USB_CTRLA_MODE_DEVICE | USB_CTRLA_ENABLE;
+  USB->DEVICE.INTENSET.reg = USB_DEVICE_INTENSET_SOF | USB_DEVICE_INTENSET_EORST;
+
+  return true;
+}
+
+void dcd_connect (uint8_t rhport)
+{
+
+}
+void dcd_disconnect (uint8_t rhport)
+{
+
+}
+
+void dcd_set_address (uint8_t rhport, uint8_t dev_addr)
+{
+  (void) rhport;
+  dcd_edpt_xfer (0, TUSB_DIR_IN_MASK, NULL, 0);
+  // Wait for EP0 to finish before switching the address.
+  while (USB->DEVICE.DeviceEndpoint[0].EPSTATUS.bit.BK1RDY == 1) {}
+  USB->DEVICE.DADD.reg = USB_DEVICE_DADD_DADD(dev_addr) | USB_DEVICE_DADD_ADDEN;
+}
+
+void dcd_set_config (uint8_t rhport, uint8_t config_num)
+{
+  (void) rhport;
+  (void) config_num;
+  // Nothing to do
+}
+
+/*------------------------------------------------------------------*/
+/* Control
+ *------------------------------------------------------------------*/
+
+bool dcd_control_xfer (uint8_t rhport, uint8_t dir, uint8_t * buffer, uint16_t length)
+{
+  (void) rhport;
+  uint8_t ep_addr = 0;
+  if (dir == TUSB_DIR_IN) {
+      ep_addr |= TUSB_DIR_IN_MASK;
+  }
+
+  return dcd_edpt_xfer (rhport, ep_addr, buffer, length);
+}
+
+bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
+{
+  (void) rhport;
+
+  uint8_t const epnum = edpt_number(desc_edpt->bEndpointAddress);
+  uint8_t const dir   = edpt_dir(desc_edpt->bEndpointAddress);
+
+  UsbDeviceDescBank* bank = &sram_registers[epnum][dir];
+  uint32_t size_value = 0;
+  while (size_value < 7) {
+    if (1 << (size_value + 3) == desc_edpt->wMaxPacketSize.size) {
+      break;
+    }
+    size_value++;
+  }
+  bank->PCKSIZE.bit.SIZE = size_value;
+
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+  if ( dir == TUSB_DIR_OUT )
+  {
+    ep->EPCFG.bit.EPTYPE0 = desc_edpt->bmAttributes.xfer + 1;
+    ep->EPINTENSET.bit.TRCPT0 = true;
+  }else
+  {
+    ep->EPCFG.bit.EPTYPE1 = desc_edpt->bmAttributes.xfer + 1;
+    ep->EPINTENSET.bit.TRCPT1 = true;
+  }
+  __ISB(); __DSB();
+
+  return true;
+}
+
+bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes)
+{
+  (void) rhport;
+
+  uint8_t const epnum = edpt_number(ep_addr);
+  uint8_t const dir   = edpt_dir(ep_addr);
+
+  UsbDeviceDescBank* bank = &sram_registers[epnum][dir];
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+  bank->ADDR.reg = (uint32_t) buffer;
+  if ( dir == TUSB_DIR_OUT )
+  {
+    bank->PCKSIZE.bit.MULTI_PACKET_SIZE = total_bytes;
+    bank->PCKSIZE.bit.BYTE_COUNT = 0;
+    ep->EPSTATUSCLR.reg |= USB_DEVICE_EPSTATUSCLR_BK0RDY;
+    ep->EPINTFLAG.reg |= USB_DEVICE_EPINTFLAG_TRFAIL0;
+  } else
+  {
+    bank->PCKSIZE.bit.MULTI_PACKET_SIZE = 0;
+    bank->PCKSIZE.bit.BYTE_COUNT = total_bytes;
+    ep->EPSTATUSSET.reg |= USB_DEVICE_EPSTATUSSET_BK1RDY;
+    ep->EPINTFLAG.reg |= USB_DEVICE_EPINTFLAG_TRFAIL1;
+  }
+
+  return true;
+}
+
+bool dcd_edpt_stalled (uint8_t rhport, uint8_t ep_addr)
+{
+  (void) rhport;
+
+  // control is never got halted
+  if ( ep_addr == 0 ) {
+      return false;
+  }
+
+  uint8_t const epnum = edpt_number(ep_addr);
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+  return (edpt_dir(ep_addr) == TUSB_DIR_IN ) ? ep->EPINTFLAG.bit.STALL1 : ep->EPINTFLAG.bit.STALL0;
+}
+
+void dcd_edpt_stall (uint8_t rhport, uint8_t ep_addr)
+{
+  (void) rhport;
+
+  uint8_t const epnum = edpt_number(ep_addr);
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+  if (edpt_dir(ep_addr) == TUSB_DIR_IN) {
+      ep->EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_STALLRQ1;
+  } else {
+      ep->EPSTATUSSET.reg = USB_DEVICE_EPSTATUSSET_STALLRQ0;
+  }
+
+  __ISB(); __DSB();
+}
+
+void dcd_edpt_clear_stall (uint8_t rhport, uint8_t ep_addr)
+{
+  (void) rhport;
+
+  uint8_t const epnum = edpt_number(ep_addr);
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+  if (edpt_dir(ep_addr) == TUSB_DIR_IN) {
+    ep->EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ1;
+  } else {
+    ep->EPSTATUSCLR.reg = USB_DEVICE_EPSTATUSCLR_STALLRQ0;
+  }
+}
+
+bool dcd_edpt_busy (uint8_t rhport, uint8_t ep_addr)
+{
+  (void) rhport;
+
+  // USBD shouldn't check control endpoint state
+  if ( 0 == ep_addr ) return false;
+
+  uint8_t const epnum = edpt_number(ep_addr);
+  UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+  if (edpt_dir(ep_addr) == TUSB_DIR_IN) {
+    return ep->EPINTFLAG.bit.TRCPT1 == 0 && ep->EPSTATUS.bit.BK1RDY == 1;
+  }
+  return ep->EPINTFLAG.bit.TRCPT0 == 0 && ep->EPSTATUS.bit.BK0RDY == 1;
+}
+
+/*------------------------------------------------------------------*/
+
+static bool maybe_handle_setup_packet(void) {
+    if (USB->DEVICE.DeviceEndpoint[0].EPINTFLAG.bit.RXSTP)
+    {
+        USB->DEVICE.DeviceEndpoint[0].EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_RXSTP;
+        // uint8_t* buf = (uint8_t*) sram_registers[0][0].ADDR.reg;
+        //
+        // if (buf[6] == 0x12) asm("bkpt");
+        // This copies the data elsewhere so we can reuse the buffer.
+        dcd_event_setup_received(0, (uint8_t*) sram_registers[0][0].ADDR.reg, true);
+        dcd_edpt_xfer(0, 0, control_out_buffer, 64);
+        setup_count += 1;
+        return true;
+    }
+    return false;
+}
+/*
+ *------------------------------------------------------------------*/
+/* USB_EORSM_DNRSM, USB_EORST_RST, USB_LPMSUSP_DDISC, USB_LPM_DCONN,
+USB_MSOF, USB_RAMACER, USB_RXSTP_TXSTP_0, USB_RXSTP_TXSTP_1,
+USB_RXSTP_TXSTP_2, USB_RXSTP_TXSTP_3, USB_RXSTP_TXSTP_4,
+USB_RXSTP_TXSTP_5, USB_RXSTP_TXSTP_6, USB_RXSTP_TXSTP_7,
+USB_STALL0_STALL_0, USB_STALL0_STALL_1, USB_STALL0_STALL_2,
+USB_STALL0_STALL_3, USB_STALL0_STALL_4, USB_STALL0_STALL_5,
+USB_STALL0_STALL_6, USB_STALL0_STALL_7, USB_STALL1_0, USB_STALL1_1,
+USB_STALL1_2, USB_STALL1_3, USB_STALL1_4, USB_STALL1_5, USB_STALL1_6,
+USB_STALL1_7, USB_SUSPEND, USB_TRFAIL0_TRFAIL_0, USB_TRFAIL0_TRFAIL_1,
+USB_TRFAIL0_TRFAIL_2, USB_TRFAIL0_TRFAIL_3, USB_TRFAIL0_TRFAIL_4,
+USB_TRFAIL0_TRFAIL_5, USB_TRFAIL0_TRFAIL_6, USB_TRFAIL0_TRFAIL_7,
+USB_TRFAIL1_PERR_0, USB_TRFAIL1_PERR_1, USB_TRFAIL1_PERR_2,
+USB_TRFAIL1_PERR_3, USB_TRFAIL1_PERR_4, USB_TRFAIL1_PERR_5,
+USB_TRFAIL1_PERR_6, USB_TRFAIL1_PERR_7, USB_UPRSM, USB_WAKEUP */
+void USB_0_Handler(void) {
+  uint32_t int_status = USB->DEVICE.INTFLAG.reg;
+
+  /*------------- Interrupt Processing -------------*/
+  if ( int_status & USB_DEVICE_INTFLAG_EORST )
+  {
+    USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTENCLR_EORST;
+    bus_reset();
+    dcd_event_bus_signal(0, DCD_EVENT_BUS_RESET, true);
+  }
+
+  // Setup packet received.
+  maybe_handle_setup_packet();
+}
+/* USB_SOF_HSOF */
+void USB_1_Handler(void) {
+    USB->DEVICE.INTFLAG.reg = USB_DEVICE_INTFLAG_SOF;
+    dcd_event_bus_signal(0, DCD_EVENT_SOF, true);
+}
+
+void transfer_complete(uint8_t direction) {
+        // uint8_t* buf = (uint8_t*) sram_registers[0][0].ADDR.reg;
+        //
+        // if (buf[6] == 0x12 || setup_count == 2) asm("bkpt");
+    uint32_t epints = USB->DEVICE.EPINTSMRY.reg;
+    for (uint8_t epnum = 0; epnum < USB_EPT_NUM; epnum++) {
+        if ((epints & (1 << epnum)) == 0) {
+            continue;
+        }
+
+        if (direction == TUSB_DIR_OUT && maybe_handle_setup_packet()) {
+            continue;
+        }
+        UsbDeviceEndpoint* ep = &USB->DEVICE.DeviceEndpoint[epnum];
+
+        UsbDeviceDescBank* bank = &sram_registers[epnum][direction];
+        uint16_t total_transfer_size = bank->PCKSIZE.bit.BYTE_COUNT;
+
+        uint8_t ep_addr = epnum;
+        if (direction == TUSB_DIR_IN) {
+            ep_addr |= TUSB_DIR_IN_MASK;
+        }
+        dcd_event_xfer_complete(0, ep_addr, total_transfer_size, DCD_XFER_SUCCESS, true);
+        if (epnum == 0 && direction == TUSB_DIR_OUT) {
+            dcd_edpt_xfer(0, 0, control_out_buffer, 64);
+        }
+        if (direction == TUSB_DIR_IN) {
+            ep->EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT1;
+        } else {
+            ep->EPINTFLAG.reg = USB_DEVICE_EPINTFLAG_TRCPT0;
+        }
+    }
+}
+
+// Bank zero is for OUT and SETUP transactions.
+/* USB_TRCPT0_0, USB_TRCPT0_1, USB_TRCPT0_2,
+USB_TRCPT0_3, USB_TRCPT0_4, USB_TRCPT0_5,
+USB_TRCPT0_6, USB_TRCPT0_7 */
+void USB_2_Handler(void) {
+    transfer_complete(TUSB_DIR_OUT);
+}
+
+// Bank one is used for IN transactions.
+/* USB_TRCPT1_0, USB_TRCPT1_1, USB_TRCPT1_2,
+USB_TRCPT1_3, USB_TRCPT1_4, USB_TRCPT1_5,
+USB_TRCPT1_6, USB_TRCPT1_7 */
+void USB_3_Handler(void) {
+    transfer_complete(TUSB_DIR_IN);
+}
+
+#endif
diff --git a/src/portable/microchip/samd51/hal.c b/src/portable/microchip/samd51/hal.c
new file mode 100644
index 000000000..d8c71a7fe
--- /dev/null
+++ b/src/portable/microchip/samd51/hal.c
@@ -0,0 +1,88 @@
+/**************************************************************************/
+/*!
+    @file     hal_nrf5x.c
+    @author   hathach
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, hathach (tinyusb.org)
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+    This file is part of the tinyusb stack.
+*/
+/**************************************************************************/
+
+#include "tusb_option.h"
+
+#if TUSB_OPT_DEVICE_ENABLED && CFG_TUSB_MCU == OPT_MCU_SAMD51
+
+#include "sam.h"
+
+#include "tusb_hal.h"
+
+/*------------------------------------------------------------------*/
+/* MACRO TYPEDEF CONSTANT ENUM
+ *------------------------------------------------------------------*/
+#define USB_NVIC_PRIO   7
+
+void tusb_hal_nrf_power_event(uint32_t event);
+
+/*------------------------------------------------------------------*/
+/* TUSB HAL
+ *------------------------------------------------------------------*/
+bool tusb_hal_init(void)
+{
+  USB->DEVICE.PADCAL.bit.TRANSP = (*((uint32_t*) USB_FUSES_TRANSP_ADDR) & USB_FUSES_TRANSP_Msk) >> USB_FUSES_TRANSP_Pos;
+  USB->DEVICE.PADCAL.bit.TRANSN = (*((uint32_t*) USB_FUSES_TRANSN_ADDR) & USB_FUSES_TRANSN_Msk) >> USB_FUSES_TRANSN_Pos;
+  USB->DEVICE.PADCAL.bit.TRIM = (*((uint32_t*) USB_FUSES_TRIM_ADDR) & USB_FUSES_TRIM_Msk) >> USB_FUSES_TRIM_Pos;
+
+  USB->DEVICE.QOSCTRL.bit.CQOS = 3;
+  USB->DEVICE.QOSCTRL.bit.DQOS = 3;
+
+  tusb_hal_int_enable(0);
+  return true;
+}
+
+void tusb_hal_int_enable(uint8_t rhport)
+{
+  (void) rhport;
+  NVIC_EnableIRQ(USB_0_IRQn);
+  NVIC_EnableIRQ(USB_1_IRQn);
+  NVIC_EnableIRQ(USB_2_IRQn);
+  NVIC_EnableIRQ(USB_3_IRQn);
+}
+
+void tusb_hal_int_disable(uint8_t rhport)
+{
+  (void) rhport;
+  NVIC_DisableIRQ(USB_3_IRQn);
+  NVIC_DisableIRQ(USB_2_IRQn);
+  NVIC_DisableIRQ(USB_1_IRQn);
+  NVIC_DisableIRQ(USB_0_IRQn);
+}
+
+#endif