Add DCD for Dialog DA1469x MCU

Dialog Semiconductor's BLE MCU DA1469x comes with full speed USB.
It's base on National Semiconductor discrete USB controller USBN9603/4.

This adds support for:
- control/interrupt/bulk endpoints (up to 64 bytes)
- ISO endpoint were not tested and may not work correctly
- reset/sleep/wakeup are handled
- code for VBUS changes is provided

2 files changed, 845 insertions, 0 deletions

diff --git a/src/portable/dialog/da146xx/dcd_da146xx.c b/src/portable/dialog/da146xx/dcd_da146xx.c
new file mode 100644
index 000000000..3a3459b7d
--- /dev/null
+++ b/src/portable/dialog/da146xx/dcd_da146xx.c
@@ -0,0 +1,842 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Jerzy Kasenberg
+ *
+ * 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 "tusb_option.h"
+
+#if TUSB_OPT_DEVICE_ENABLED && CFG_TUSB_MCU == OPT_MCU_DA1469X
+
+#include "DA1469xAB.h"
+
+#include "device/dcd.h"
+
+/*------------------------------------------------------------------*/
+/* MACRO TYPEDEF CONSTANT ENUM
+ *------------------------------------------------------------------*/
+
+// Since TinyUSB doesn't use SOF for now, and this interrupt too often (1ms interval)
+// We disable SOF for now until needed later on
+#define USE_SOF           0
+
+#define EP_MAX            4
+
+#define NFSR_NODE_RESET         0
+#define NFSR_NODE_RESUME        1
+#define NFSR_NODE_OPERATIONAL   2
+#define NFSR_NODE_SUSPEND       3
+
+static TU_ATTR_ALIGNED(4) uint8_t _setup_packet[8];
+
+typedef struct
+{
+  union
+  {
+    __IOM uint32_t epc_in;
+    __IOM uint32_t USB_EPC0_REG;                 /*!< (@ 0x00000080) Endpoint Control 0 Register  */
+    __IOM uint32_t USB_EPC1_REG;                 /*!< (@ 0x000000A0) Endpoint Control Register 1  */
+    __IOM uint32_t USB_EPC3_REG;                 /*!< (@ 0x000000C0) Endpoint Control Register 3  */
+    __IOM uint32_t USB_EPC5_REG;                 /*!< (@ 0x000000E0) Endpoint Control Register 5  */
+  };
+  union
+  {
+    __IOM uint32_t txd;
+    __IOM uint32_t USB_TXD0_REG;                 /*!< (@ 0x00000084) Transmit Data 0 Register     */
+    __IOM uint32_t USB_TXD1_REG;                 /*!< (@ 0x000000A4) Transmit Data Register 1     */
+    __IOM uint32_t USB_TXD2_REG;                 /*!< (@ 0x000000C4) Transmit Data Register 2     */
+    __IOM uint32_t USB_TXD3_REG;                 /*!< (@ 0x000000E4) Transmit Data Register 3     */
+  };
+  union
+  {
+    __IOM uint32_t txs;
+    __IOM uint32_t USB_TXS0_REG;                 /*!< (@ 0x00000088) Transmit Status 0 Register   */
+    __IOM uint32_t USB_TXS1_REG;                 /*!< (@ 0x000000A8) Transmit Status Register 1   */
+    __IOM uint32_t USB_TXS2_REG;                 /*!< (@ 0x000000C8) Transmit Status Register 2   */
+    __IOM uint32_t USB_TXS3_REG;                 /*!< (@ 0x000000E8) Transmit Status Register 3   */
+  };
+  union
+  {
+    __IOM uint32_t txc;
+    __IOM uint32_t USB_TXC0_REG;                 /*!< (@ 0x0000008C) Transmit command 0 Register  */
+    __IOM uint32_t USB_TXC1_REG;                 /*!< (@ 0x000000AC) Transmit Command Register 1  */
+    __IOM uint32_t USB_TXC2_REG;                 /*!< (@ 0x000000CC) Transmit Command Register 2  */
+    __IOM uint32_t USB_TXC3_REG;                 /*!< (@ 0x000000EC) Transmit Command Register 3  */
+  };
+  union
+  {
+    __IOM uint32_t epc_out;
+    __IOM uint32_t USB_EP0_NAK_REG;              /*!< (@ 0x00000090) EP0 INNAK and OUTNAK Register */
+    __IOM uint32_t USB_EPC2_REG;                 /*!< (@ 0x000000B0) Endpoint Control Register 2   */
+    __IOM uint32_t USB_EPC4_REG;                 /*!< (@ 0x000000D0) Endpoint Control Register 4   */
+    __IOM uint32_t USB_EPC6_REG;                 /*!< (@ 0x000000F0) Endpoint Control Register 6   */
+  };
+  union
+  {
+    __IOM uint32_t rxd;
+    __IOM uint32_t USB_RXD0_REG;                 /*!< (@ 0x00000094) Receive Data 0 Register       */
+    __IOM uint32_t USB_RXD1_REG;                 /*!< (@ 0x000000B4) Receive Data Register,1       */
+    __IOM uint32_t USB_RXD2_REG;                 /*!< (@ 0x000000D4) Receive Data Register 2       */
+    __IOM uint32_t USB_RXD3_REG;                 /*!< (@ 0x000000F4) Receive Data Register 3       */
+  };
+  union
+  {
+    __IOM uint32_t rxs;
+    __IOM uint32_t USB_RXS0_REG;                 /*!< (@ 0x00000098) Receive Status 0 Register     */
+    __IOM uint32_t USB_RXS1_REG;                 /*!< (@ 0x000000B8) Receive Status Register 1     */
+    __IOM uint32_t USB_RXS2_REG;                 /*!< (@ 0x000000D8) Receive Status Register 2     */
+    __IOM uint32_t USB_RXS3_REG;                 /*!< (@ 0x000000F8) Receive Status Register 3     */
+  };
+  union
+  {
+    __IOM uint32_t rxc;
+    __IOM uint32_t USB_RXC0_REG;                 /*!< (@ 0x0000009C) Receive Command 0 Register    */
+    __IOM uint32_t USB_RXC1_REG;                 /*!< (@ 0x000000BC) Receive Command Register 1    */
+    __IOM uint32_t USB_RXC2_REG;                 /*!< (@ 0x000000DC) Receive Command Register 2    */
+    __IOM uint32_t USB_RXC3_REG;                 /*!< (@ 0x000000FC) Receive Command Register 3    */
+  };
+} EPx_REGS;
+
+#define EP_REGS(first_ep_reg) (EPx_REGS*)(&USB->first_ep_reg)
+
+// Dialog register fields and bit mask are very long. Filed masks repeat register names.
+// Those convenience macros are a way to reduce complexity of register modification lines.
+#define GET_BIT(val, field) (val & field ## _Msk) >> field ## _Pos
+#define REG_GET_BIT(reg, field) (USB->reg & USB_ ## reg ## _ ## field ## _Msk)
+#define REG_SET_BIT(reg, field) USB->reg |= USB_ ## reg ## _ ## field ## _Msk
+#define REG_CLR_BIT(reg, field) USB->reg &= ~USB_ ## reg ## _ ## field ## _Msk
+#define REG_SET_VAL(reg, field, val) USB->reg = (USB->reg & ~USB_ ## reg ## _ ## field ## _Msk) | (val << USB_ ## reg ## _ ## field ## _Pos)
+
+typedef struct {
+  EPx_REGS * regs;
+  uint8_t * buffer;
+  // Total length of current transfer
+  uint16_t total_len;
+  // Bytes transferred so far
+  uint16_t transferred;
+  uint16_t max_packet_size;
+  // Packet size sent or received so far. It is used to modify transferred field
+  // after ACK is received or when filling ISO endpoint with size larger then
+  // FIFO size.
+  uint16_t last_packet_size;
+  uint8_t ep_addr;
+  // DATA0/1 toggle bit 1 DATA1 is expected or transmitted
+  uint8_t data1 : 1;
+  // Endpoint is stalled
+  uint8_t stall : 1;
+} xfer_ctl_t;
+
+static struct
+{
+  bool vbus_present;
+  bool in_reset;
+  xfer_ctl_t xfer_status[EP_MAX][2];
+} _dcd =
+{
+  .vbus_present = false,
+  .xfer_status =
+  {
+    { { .regs = EP_REGS(USB_EPC0_REG) }, { .regs = EP_REGS(USB_EPC0_REG) } },
+    { { .regs = EP_REGS(USB_EPC1_REG) }, { .regs = EP_REGS(USB_EPC1_REG) } },
+    { { .regs = EP_REGS(USB_EPC3_REG) }, { .regs = EP_REGS(USB_EPC3_REG) } },
+    { { .regs = EP_REGS(USB_EPC5_REG) }, { .regs = EP_REGS(USB_EPC5_REG) } },
+  }
+};
+
+// Two endpoint 0 descriptor definition for unified dcd_edpt_open()
+static const tusb_desc_endpoint_t ep0OUT_desc =
+{
+  .bLength          = sizeof(tusb_desc_endpoint_t),
+  .bDescriptorType  = TUSB_DESC_ENDPOINT,
+
+  .bEndpointAddress = 0x00,
+  .bmAttributes     = { .xfer = TUSB_XFER_CONTROL },
+  .wMaxPacketSize   = { .size = CFG_TUD_ENDPOINT0_SIZE },
+  .bInterval        = 0
+};
+
+static const tusb_desc_endpoint_t ep0IN_desc =
+{
+  .bLength          = sizeof(tusb_desc_endpoint_t),
+  .bDescriptorType  = TUSB_DESC_ENDPOINT,
+
+  .bEndpointAddress = 0x80,
+  .bmAttributes     = { .xfer = TUSB_XFER_CONTROL },
+  .wMaxPacketSize   = { .size = CFG_TUD_ENDPOINT0_SIZE },
+  .bInterval        = 0
+};
+
+#define XFER_CTL_BASE(_ep, _dir) &_dcd.xfer_status[_ep][_dir]
+
+// Function could be called when VBUS change was detected.
+void tusb_vbus_changed(bool present)
+{
+  if (present != _dcd.vbus_present)
+  {
+    _dcd.vbus_present = present;
+    if (present)
+    {
+      USB->USB_MCTRL_REG = USB_USB_MCTRL_REG_USBEN_Msk;
+      USB->USB_NFSR_REG = 0;
+      USB->USB_FAR_REG = 0x80;
+      USB->USB_NFSR_REG = NFSR_NODE_RESET;
+      USB->USB_TXMSK_REG = 0;
+      USB->USB_RXMSK_REG = 0;
+
+      USB->USB_MAMSK_REG = USB_USB_MAMSK_REG_USB_M_INTR_Msk |
+                           USB_USB_MAMSK_REG_USB_M_ALT_Msk |
+                           USB_USB_MAMSK_REG_USB_M_WARN_Msk;
+      USB->USB_ALTMSK_REG = USB_USB_ALTMSK_REG_USB_M_RESET_Msk;
+    }
+    else
+    {
+      USB->USB_MCTRL_REG = 0;
+    }
+  }
+}
+
+static void transmit_packet(xfer_ctl_t * xfer)
+{
+  int left_to_send;
+  uint8_t const *src;
+  EPx_REGS *regs = xfer->regs;
+  uint32_t txc;
+
+  txc = USB_USB_TXC1_REG_USB_TX_EN_Msk;
+  if (xfer->data1) txc |= USB_USB_TXC1_REG_USB_TOGGLE_TX_Msk;
+
+  src = &xfer->buffer[xfer->transferred];
+  left_to_send = xfer->total_len - xfer->transferred;
+  if (left_to_send > xfer->max_packet_size - xfer->last_packet_size)
+  {
+    left_to_send = xfer->max_packet_size - xfer->last_packet_size;
+  }
+
+  // Loop checks TCOUNT all the time since this value is saturated to 31
+  // and can't be read just once before.
+  while ((regs->txs & USB_USB_TXS1_REG_USB_TCOUNT_Msk) > 0 && left_to_send > 0)
+  {
+    regs->txd = *src++;
+    xfer->last_packet_size++;
+    left_to_send--;
+  }
+  if (tu_edpt_number(xfer->ep_addr) != 0)
+  {
+    if (left_to_send > 0)
+    {
+      // Max packet size is set to value greater then FIFO. Enable fifo level warning
+      // to handle larger packets.
+      txc |= USB_USB_TXC1_REG_USB_TFWL_Msk;
+    }
+    else
+    {
+      // Whole packet already in fifo, no need to refill it later.  Mark last.
+      txc |= USB_USB_TXC1_REG_USB_LAST_Msk;
+    }
+  }
+  // Enable transfer with correct interrupts enabled
+  regs->txc = txc;
+}
+
+static void receive_packet(xfer_ctl_t *xfer, uint16_t bytes_in_fifo)
+{
+  EPx_REGS *regs = xfer->regs;
+  uint16_t remaining = xfer->total_len - xfer->transferred;
+  uint16_t receive_this_time = bytes_in_fifo;
+
+  if (remaining <= bytes_in_fifo) receive_this_time = remaining;
+
+  uint8_t *buf = xfer->buffer + xfer->transferred + xfer->last_packet_size;
+
+  for (int i = 0; i < receive_this_time; ++i) buf[i] = regs->rxd;
+
+  xfer->transferred += receive_this_time;
+  xfer->last_packet_size += receive_this_time;
+}
+
+static void handle_ep0_rx(void)
+{
+  int packet_size;
+  uint32_t rxs0 = USB->USB_RXS0_REG;
+
+  xfer_ctl_t *xfer = XFER_CTL_BASE(0, TUSB_DIR_OUT);
+
+  packet_size = GET_BIT(rxs0, USB_USB_RXS0_REG_USB_RCOUNT);
+  if (rxs0 & USB_USB_RXS0_REG_USB_SETUP_Msk)
+  {
+    xfer_ctl_t *xfer_in = XFER_CTL_BASE(0, TUSB_DIR_IN);
+    // Setup packet is in
+    for (int i = 0; i < packet_size; ++i) _setup_packet[i] = USB->USB_RXD0_REG;
+
+    xfer->stall = 0;
+    xfer->data1 = 1;
+    xfer_in->stall = 0;
+    xfer_in->data1 = 1;
+    REG_SET_BIT(USB_TXC0_REG, USB_TOGGLE_TX0);
+    REG_CLR_BIT(USB_EPC0_REG, USB_STALL);
+    dcd_event_setup_received(0, _setup_packet,true);
+  }
+  else
+  {
+    if (GET_BIT(rxs0, USB_USB_RXS0_REG_USB_TOGGLE_RX0) != xfer->data1)
+    {
+      // Toggle bit does not match discard packet
+      REG_SET_BIT(USB_RXC0_REG, USB_FLUSH);
+    }
+    else
+    {
+      receive_packet(xfer, packet_size);
+      xfer->data1 ^= 1;
+
+      if (xfer->total_len == xfer->transferred || xfer->last_packet_size < xfer->max_packet_size)
+      {
+        dcd_event_xfer_complete(0, 0, xfer->transferred, XFER_RESULT_SUCCESS, true);
+      }
+      else
+      {
+        xfer->last_packet_size = 0;
+        // Re-enable reception
+        REG_SET_BIT(USB_RXC0_REG, USB_RX_EN);
+      }
+    }
+  }
+}
+
+static void handle_ep0_tx(void)
+{
+  uint32_t txs0;
+  xfer_ctl_t *xfer = XFER_CTL_BASE(0, TUSB_DIR_IN);
+  EPx_REGS *regs = xfer->regs;
+
+  txs0 = regs->USB_TXS0_REG;
+
+  if (GET_BIT(txs0, USB_USB_TXS0_REG_USB_TX_DONE))
+  {
+    // ACK received
+    if (GET_BIT(txs0, USB_USB_TXS0_REG_USB_ACK_STAT))
+    {
+      xfer->transferred += xfer->last_packet_size;
+      xfer->last_packet_size = 0;
+      xfer->data1 ^= 1;
+      REG_SET_VAL(USB_TXC0_REG, USB_TOGGLE_TX0, xfer->data1);
+      if (xfer->transferred == xfer->total_len)
+      {
+        dcd_event_xfer_complete(0, 0 | TUSB_DIR_IN_MASK, xfer->total_len, XFER_RESULT_SUCCESS, true);
+        return;
+      }
+    }
+    else
+    {
+      // Start from the beginning
+      xfer->last_packet_size = 0;
+    }
+    transmit_packet(xfer);
+  }
+}
+
+static void handle_epx_rx_ev(uint8_t ep)
+{
+  uint32_t rxs;
+  int packet_size;
+  xfer_ctl_t *xfer = XFER_CTL_BASE(ep, TUSB_DIR_OUT);
+
+  EPx_REGS *regs = xfer->regs;
+
+  rxs = regs->rxs;
+
+  if (GET_BIT(rxs, USB_USB_RXS1_REG_USB_RX_ERR))
+  {
+    regs->rxc |= USB_USB_RXC1_REG_USB_FLUSH_Msk;
+  }
+  else
+  {
+    packet_size = GET_BIT(rxs, USB_USB_RXS1_REG_USB_RXCOUNT);
+    receive_packet(xfer, packet_size);
+    if (GET_BIT(rxs, USB_USB_RXS1_REG_USB_RX_LAST))
+    {
+      if (GET_BIT(rxs, USB_USB_RXS1_REG_USB_TOGGLE_RX) != xfer->data1)
+      {
+        // Toggle bit does not match discard packet
+        regs->rxc |= USB_USB_RXC1_REG_USB_FLUSH_Msk;
+      }
+      else
+      {
+        xfer->data1 ^= 1;
+        if (xfer->total_len == xfer->transferred || xfer->last_packet_size < xfer->max_packet_size)
+        {
+          dcd_event_xfer_complete(0, xfer->ep_addr, xfer->transferred, XFER_RESULT_SUCCESS, true);
+        }
+        else
+        {
+          xfer->last_packet_size = 0;
+          // Re-enable reception
+          regs->rxc |= USB_USB_RXC1_REG_USB_RX_EN_Msk;
+        }
+      }
+    }
+  }
+}
+
+static void handle_rx_ev(void)
+{
+  if (USB->USB_RXEV_REG & 1)
+    handle_epx_rx_ev(1);
+  if (USB->USB_RXEV_REG & 2)
+    handle_epx_rx_ev(2);
+  if (USB->USB_RXEV_REG & 4)
+    handle_epx_rx_ev(3);
+}
+
+static void handle_epx_tx_ev(xfer_ctl_t *xfer)
+{
+  uint32_t usb_txs1_reg;
+  EPx_REGS *regs = xfer->regs;
+
+  usb_txs1_reg = regs->USB_TXS1_REG;
+
+  if (GET_BIT(usb_txs1_reg, USB_USB_TXS1_REG_USB_TX_DONE))
+  {
+    if (GET_BIT(usb_txs1_reg, USB_USB_TXS1_REG_USB_ACK_STAT))
+    {
+      // ACK received, update transfer state and DATA0/1 bit
+      xfer->transferred += xfer->last_packet_size;
+      xfer->last_packet_size = 0;
+      xfer->data1 ^= 1;
+
+      if (xfer->transferred == xfer->total_len)
+      {
+        dcd_event_xfer_complete(0, xfer->ep_addr, xfer->total_len, XFER_RESULT_SUCCESS, true);
+        return;
+      }
+    }
+    else
+    {
+      xfer->last_packet_size = 0;
+    }
+    transmit_packet(xfer);
+  }
+}
+
+static void handle_tx_ev(void)
+{
+  if (USB->USB_TXEV_REG & 1)
+    handle_epx_tx_ev(XFER_CTL_BASE(1, TUSB_DIR_IN));
+  if (USB->USB_TXEV_REG & 2)
+    handle_epx_tx_ev(XFER_CTL_BASE(2, TUSB_DIR_IN));
+  if (USB->USB_TXEV_REG & 4)
+    handle_epx_tx_ev(XFER_CTL_BASE(3, TUSB_DIR_IN));
+}
+
+static void handle_bus_reset(void)
+{
+  USB->USB_NFSR_REG = 0;
+  USB->USB_FAR_REG = 0x80;
+  USB->USB_ALTMSK_REG = 0;
+  USB->USB_NFSR_REG = NFSR_NODE_RESET;
+  USB->USB_TXMSK_REG = 0;
+  USB->USB_RXMSK_REG = 0;
+  (void)USB->USB_ALTEV_REG;
+  _dcd.in_reset = true;
+
+  dcd_event_bus_signal(0, DCD_EVENT_BUS_RESET, true);
+
+  USB->USB_MAMSK_REG = USB_USB_MAMSK_REG_USB_M_INTR_Msk |
+#if USE_SOF
+                       USB_USB_MAMSK_REG_USB_M_FRAME_Msk |
+#endif
+                       USB_USB_MAMSK_REG_USB_M_WARN_Msk |
+                       USB_USB_MAMSK_REG_USB_M_ALT_Msk;
+  USB->USB_NFSR_REG = NFSR_NODE_OPERATIONAL;
+  USB->USB_ALTMSK_REG = USB_USB_ALTMSK_REG_USB_M_SD3_Msk |
+                        USB_USB_ALTMSK_REG_USB_M_RESUME_Msk;
+  // There is no information about end of reset state
+  // USB_FRAME event will be used to enable reset detection again
+  REG_SET_BIT(USB_MAEV_REG, USB_FRAME);
+  dcd_edpt_open (0, &ep0OUT_desc);
+  dcd_edpt_open (0, &ep0IN_desc);
+}
+
+static void handle_alt_ev(void)
+{
+  uint32_t alt_ev = USB->USB_ALTEV_REG;
+
+  if (GET_BIT(alt_ev, USB_USB_ALTEV_REG_USB_RESET))
+  {
+    handle_bus_reset();
+  }
+  else
+  {
+    if (GET_BIT(alt_ev, USB_USB_ALTEV_REG_USB_RESUME))
+    {
+      USB->USB_NFSR_REG = NFSR_NODE_OPERATIONAL;
+      USB->USB_ALTMSK_REG &= ~USB_USB_ALTMSK_REG_USB_M_RESUME_Msk;
+      USB->USB_ALTMSK_REG |= USB_USB_ALTMSK_REG_USB_M_SD3_Msk;
+      dcd_event_bus_signal(0, DCD_EVENT_RESUME, true);
+    }
+    if (GET_BIT(alt_ev, USB_USB_ALTEV_REG_USB_SD3))
+    {
+      USB->USB_NFSR_REG = NFSR_NODE_SUSPEND;
+      USB->USB_ALTMSK_REG |= USB_USB_ALTMSK_REG_USB_M_RESUME_Msk;
+      USB->USB_ALTMSK_REG &= ~USB_USB_ALTMSK_REG_USB_M_SD3_Msk | USB_USB_ALTMSK_REG_USB_M_SD5_Msk;
+      dcd_event_bus_signal(0, DCD_EVENT_SUSPEND, true);
+    }
+  }
+}
+
+static void handle_epx_tx_refill(uint8_t ep)
+{
+  transmit_packet(XFER_CTL_BASE(ep, TUSB_DIR_IN));
+}
+
+static void handle_fifo_warning(void)
+{
+  uint32_t fifo_warning = USB->USB_FWEV_REG;
+
+  if (fifo_warning & 0x01)
+    handle_epx_tx_refill(1);
+  if (fifo_warning & 0x02)
+    handle_epx_tx_refill(2);
+  if (fifo_warning & 0x04)
+    handle_epx_tx_refill(3);
+  if (fifo_warning & 0x10)
+    handle_epx_rx_ev(1);
+  if (fifo_warning & 0x20)
+    handle_epx_rx_ev(2);
+  if (fifo_warning & 0x40)
+    handle_epx_rx_ev(3);
+}
+
+static void handle_ep0_nak(void)
+{
+  uint32_t ep0_nak = USB->USB_EP0_NAK_REG;
+
+  if (REG_GET_BIT(USB_EPC0_REG, USB_STALL))
+  {
+    if (GET_BIT(ep0_nak, USB_USB_EP0_NAK_REG_USB_EP0_INNAK))
+    {
+      // EP0 is stalled and NAK was sent, it means that RX is enabled
+      // Disable RX for now.
+      REG_CLR_BIT(USB_RXC0_REG, USB_RX_EN);
+      REG_SET_BIT(USB_TXC0_REG, USB_TX_EN);
+    }
+    if (GET_BIT(ep0_nak, USB_USB_EP0_NAK_REG_USB_EP0_OUTNAK))
+    {
+      REG_SET_BIT(USB_RXC0_REG, USB_RX_EN);
+    }
+  }
+  else
+  {
+    REG_CLR_BIT(USB_MAMSK_REG, USB_M_EP0_NAK);
+  }
+}
+
+/*------------------------------------------------------------------*/
+/* Controller API
+ *------------------------------------------------------------------*/
+void dcd_init(uint8_t rhport)
+{
+  (void)rhport;
+
+  USB->USB_MCTRL_REG = USB_USB_MCTRL_REG_USBEN_Msk;
+  tusb_vbus_changed((CRG_TOP->ANA_STATUS_REG & CRG_TOP_ANA_STATUS_REG_VBUS_AVAILABLE_Msk) != 0);
+}
+
+void dcd_int_enable(uint8_t rhport)
+{
+  (void)rhport;
+
+  NVIC_EnableIRQ(USB_IRQn);
+}
+
+void dcd_int_disable(uint8_t rhport)
+{
+  (void)rhport;
+
+  NVIC_DisableIRQ(USB_IRQn);
+}
+
+void dcd_set_address(uint8_t rhport, uint8_t dev_addr)
+{
+  (void)rhport;
+
+  // Set default address for one ZLP
+  USB->USB_EPC0_REG = USB_USB_EPC0_REG_USB_DEF_Msk;
+  USB->USB_FAR_REG = (dev_addr & USB_USB_FAR_REG_USB_AD_Msk) | USB_USB_FAR_REG_USB_AD_EN_Msk;
+  dcd_edpt_xfer(rhport, tu_edpt_addr(0, TUSB_DIR_IN), NULL, 0);
+}
+
+void dcd_remote_wakeup(uint8_t rhport)
+{
+  (void)rhport;
+}
+
+void dcd_connect(uint8_t rhport)
+{
+  (void)rhport;
+
+  REG_SET_BIT(USB_MCTRL_REG, USB_NAT);
+}
+
+void dcd_disconnect(uint8_t rhport)
+{
+  (void)rhport;
+
+  REG_CLR_BIT(USB_MCTRL_REG, USB_NAT);
+}
+
+
+/*------------------------------------------------------------------*/
+/* DCD Endpoint port
+ *------------------------------------------------------------------*/
+
+bool dcd_edpt_open(uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
+{
+  uint8_t const epnum = tu_edpt_number(desc_edpt->bEndpointAddress);
+  uint8_t const dir   = tu_edpt_dir(desc_edpt->bEndpointAddress);
+  xfer_ctl_t * xfer = XFER_CTL_BASE(epnum, dir);
+  uint8_t iso_mask = 0;
+  
+  (void)rhport;
+
+  TU_ASSERT(desc_edpt->wMaxPacketSize.size <= 1023);
+  TU_ASSERT(epnum < EP_MAX);
+
+  xfer->max_packet_size = desc_edpt->wMaxPacketSize.size;
+  xfer->ep_addr = desc_edpt->bEndpointAddress;
+  xfer->data1 = 0;
+
+  if (epnum != 0 && desc_edpt->bmAttributes.xfer == 1) iso_mask = USB_USB_EPC1_REG_USB_ISO_Msk;
+
+  if (epnum == 0)
+  {
+    USB->USB_MAMSK_REG |= USB_USB_MAMSK_REG_USB_M_EP0_RX_Msk |
+                          USB_USB_MAMSK_REG_USB_M_EP0_TX_Msk;
+  }
+  else
+  {
+    if (dir == TUSB_DIR_OUT)
+    {
+      xfer->regs->epc_out = epnum | USB_USB_EPC1_REG_USB_EP_EN_Msk | iso_mask;
+      USB->USB_RXMSK_REG |= 0x101 << (epnum - 1);
+      REG_SET_BIT(USB_MAMSK_REG, USB_M_RX_EV);
+    }
+    else
+    {
+      xfer->regs->epc_in = epnum | USB_USB_EPC1_REG_USB_EP_EN_Msk | iso_mask;
+      USB->USB_TXMSK_REG |= 0x101 << (epnum - 1);
+      REG_SET_BIT(USB_MAMSK_REG, USB_M_TX_EV);
+    }
+  }
+
+  return true;
+}
+
+bool dcd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes)
+{
+  uint8_t const epnum = tu_edpt_number(ep_addr);
+  uint8_t const dir   = tu_edpt_dir(ep_addr);
+  xfer_ctl_t * xfer = XFER_CTL_BASE(epnum, dir);
+
+  (void)rhport;
+
+  xfer->buffer = buffer;
+  xfer->total_len = total_bytes;
+  xfer->last_packet_size = 0;
+  xfer->transferred = 0;
+
+  if (dir == TUSB_DIR_OUT)
+  {
+    if (epnum != 0)
+    {
+      if (xfer->max_packet_size > 64)
+      {
+        // For endpoint size greater then FIFO size enable FIFO level warning interrupt
+        // when FIFO has less then 17 bytes free.
+        xfer->regs->rxc |= USB_USB_RXC1_REG_USB_RFWL_Msk;
+      }
+      else
+      {
+        // If max_packet_size would fit in FIFO no need for FIFO level warning interrupt.
+        xfer->regs->rxc &= ~USB_USB_RXC1_REG_USB_RFWL_Msk;
+      }
+    }
+    // USB_RX_EN bit is in same place for all endpoints.
+    xfer->regs->rxc = USB_USB_RXC0_REG_USB_RX_EN_Msk;
+  }
+  else // IN
+  {
+    transmit_packet(xfer);
+  }
+
+  return true;
+}
+
+void dcd_edpt_stall(uint8_t rhport, uint8_t ep_addr)
+{
+  uint8_t const epnum = tu_edpt_number(ep_addr);
+  uint8_t const dir   = tu_edpt_dir(ep_addr);
+
+  (void)rhport;
+
+  xfer_ctl_t * xfer = XFER_CTL_BASE(epnum, dir);
+  xfer->stall = 1;
+
+  if (epnum == 0)
+  {
+    // EP0 has just one registers to control stall for IN and OUT
+    REG_SET_BIT(USB_EPC0_REG, USB_STALL);
+    if (dir == TUSB_DIR_OUT)
+    {
+      xfer->regs->USB_RXC0_REG = USB_USB_RXC0_REG_USB_RX_EN_Msk;
+    }
+    else
+    {
+      if (xfer->regs->USB_RXC0_REG & USB_USB_RXC0_REG_USB_RX_EN_Msk)
+      {
+        // If RX is also enabled TX will not be stalled since RX has
+        // higher priority. Enable NAK interrupt to handle stall.
+        REG_SET_BIT(USB_MAMSK_REG, USB_M_EP0_NAK);
+      }
+      else
+      {
+        xfer->regs->USB_TXC0_REG |= USB_USB_TXC0_REG_USB_TX_EN_Msk;
+      }
+    }
+  }
+  else
+  {
+    if (dir == TUSB_DIR_OUT)
+    {
+      xfer->regs->epc_out |= USB_USB_EPC1_REG_USB_STALL_Msk;
+      xfer->regs->rxc |= USB_USB_RXC1_REG_USB_RX_EN_Msk;
+    }
+    else
+    {
+      xfer->regs->epc_in |= USB_USB_EPC1_REG_USB_STALL_Msk;
+      xfer->regs->txc |= USB_USB_TXC1_REG_USB_TX_EN_Msk | USB_USB_TXC1_REG_USB_LAST_Msk;
+    }
+  }
+}
+
+void dcd_edpt_clear_stall(uint8_t rhport, uint8_t ep_addr)
+{
+  uint8_t const epnum = tu_edpt_number(ep_addr);
+  uint8_t const dir   = tu_edpt_dir(ep_addr);
+
+  (void)rhport;
+
+  xfer_ctl_t * xfer = XFER_CTL_BASE(epnum, dir);
+
+  // Clear stall is called in response to Clear Feature ENDPOINT_HALT, reset toggle
+  xfer->data1 = 0;
+  xfer->stall = 0;
+
+  if (dir == TUSB_DIR_OUT)
+  {
+    xfer->regs->epc_out &= ~USB_USB_EPC1_REG_USB_STALL_Msk;
+  }
+  else
+  {
+    xfer->regs->epc_in &= ~USB_USB_EPC1_REG_USB_STALL_Msk;
+  }
+  if (epnum == 0)
+  {
+    REG_CLR_BIT(USB_MAMSK_REG, USB_M_EP0_NAK);
+  }
+}
+
+/*------------------------------------------------------------------*/
+/* Interrupt Handler
+ *------------------------------------------------------------------*/
+
+void dcd_int_handler(uint8_t rhport)
+{
+  uint32_t int_status = USB->USB_MAEV_REG;
+
+  (void)rhport;
+
+  if (GET_BIT(int_status, USB_USB_MAEV_REG_USB_WARN))
+  {
+    handle_fifo_warning();
+  }
+
+  if (GET_BIT(int_status, USB_USB_MAEV_REG_USB_CH_EV))
+  {
+    // TODO: for now just clear interrupt
+    (void)USB->USB_CHARGER_STAT_REG;
+  }
+
+  if (GET_BIT(int_status, USB_USB_MAEV_REG_USB_EP0_NAK))
+  {
+    handle_ep0_nak();
+  }
+
+  if (GET_BIT(int_status, USB_USB_MAEV_REG_USB_EP0_RX))
+  {
+    handle_ep0_rx();
+  }
+
+  if (GET_BIT(int_status, USB_USB_MAEV_REG_USB_EP0_TX))
+  {
+    handle_ep0_tx();
+  }
+
+  if (GET_BIT(int_status, USB_USB_MAEV_REG_USB_RX_EV))
+  {
+    handle_rx_ev();
+  }
+
+  if (GET_BIT(int_status, USB_USB_MAEV_REG_USB_NAK))
+  {
+    (void)USB->USB_NAKEV_REG;
+  }
+
+  if (GET_BIT(int_status, USB_USB_MAEV_REG_USB_FRAME))
+  {
+    if (_dcd.in_reset)
+    {
+      // Enable reset detection
+      _dcd.in_reset = false;
+      (void)USB->USB_ALTEV_REG;
+    }
+#if USE_SOF
+    dcd_event_bus_signal(0, DCD_EVENT_SOF, true);
+#else
+    // SOF was used to re-enable reset detection
+    // No need to keep it enabled
+    USB->USB_MAMSK_REG &= ~USB_USB_MAMSK_REG_USB_M_FRAME_Msk;
+#endif
+  }
+
+  if (GET_BIT(int_status, USB_USB_MAEV_REG_USB_TX_EV))
+  {
+    handle_tx_ev();
+  }
+
+  if (GET_BIT(int_status, USB_USB_MAEV_REG_USB_ALT))
+  {
+    handle_alt_ev();
+  }
+}
+
+#endif
diff --git a/src/tusb_option.h b/src/tusb_option.h
index 0a227483f..706a94584 100644
--- a/src/tusb_option.h
+++ b/src/tusb_option.h
@@ -92,6 +92,9 @@
 // Espressif
 #define OPT_MCU_ESP32S2           900 ///< Espressif ESP32-S2
 
+// Dialog
+#define OPT_MCU_DA1469X          1000 ///< Dialog Semiconductor DA1469x
+
 /** @} */
 
 /** \defgroup group_supported_os Supported RTOS