diff --git a/src/class/audio/audio_device.c b/src/class/audio/audio_device.c
index c71ad6b8e..ef533e540 100644
--- a/src/class/audio/audio_device.c
+++ b/src/class/audio/audio_device.c
@@ -135,7 +135,6 @@ typedef struct
     CFG_TUSB_MCU == OPT_MCU_RP2040                || /* Don't want to change driver */                                  \
     CFG_TUSB_MCU == OPT_MCU_VALENTYUSB_EPTRI      || /* Intermediate software buffer required */                        \
     CFG_TUSB_MCU == OPT_MCU_CXD56                 || /* No clue how driver works */                                     \
-    CFG_TUSB_MCU == OPT_MCU_DA1469X               || /* Uses DMA - Ok for FIFO, had no time for implementation */       \
     CFG_TUSB_MCU == OPT_MCU_NRF5X                 || /* Uses DMA - Ok for FIFO, had no time for implementation */       \
     CFG_TUSB_MCU == OPT_MCU_LPC11UXX              || /* Uses DMA - Ok for FIFO, had no time for implementation */       \
     CFG_TUSB_MCU == OPT_MCU_LPC13XX               || \
diff --git a/src/portable/dialog/da146xx/dcd_da146xx.c b/src/portable/dialog/da146xx/dcd_da146xx.c
index 59f728d08..8e1a5ddfd 100644
--- a/src/portable/dialog/da146xx/dcd_da146xx.c
+++ b/src/portable/dialog/da146xx/dcd_da146xx.c
@@ -25,6 +25,7 @@
  */
 
 #include "tusb_option.h"
+#include "common/tusb_fifo.h"
 
 #if TUSB_OPT_DEVICE_ENABLED && CFG_TUSB_MCU == OPT_MCU_DA1469X
 
@@ -196,6 +197,7 @@ typedef struct
 typedef struct {
   EPx_REGS * regs;
   uint8_t * buffer;
+  tu_fifo_t * ff;
   // Total length of current transfer
   uint16_t total_len;
   // Bytes transferred so far
@@ -292,7 +294,6 @@ static void fill_tx_fifo(xfer_ctl_t * xfer)
   EPx_REGS *regs = xfer->regs;
   uint8_t const epnum = tu_edpt_number(xfer->ep_addr);
 
-  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)
   {
@@ -301,12 +302,51 @@ static void fill_tx_fifo(xfer_ctl_t * xfer)
 
   // 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)
+
+  if (xfer->ff)
   {
-    regs->txd = *src++;
-    xfer->last_packet_size++;
-    left_to_send--;
+    // Since TCOUNT is to be considered, we handle the FIFO reading manually here
+    // As we copy from a ring buffer FIFO, a wrap might occur making it necessary to conduct two copies
+    // Check for first linear part
+    uint8_t * src;
+    uint16_t len = tu_fifo_get_linear_read_info(xfer->ff, 0, &src, left_to_send);  // We want to read from the FIFO
+    uint16_t len1 = len;
+    while ((regs->txs & USB_USB_TXS1_REG_USB_TCOUNT_Msk) > 0 && len1 > 0)
+    {
+      regs->txd = *src++;
+      xfer->last_packet_size++;
+      len1--;
+    }
+
+    tu_fifo_advance_read_pointer(ff, len-len1);
+    left_to_send -= (len-len1);
+
+    // Check for wrapped part
+    if ((regs->txs & USB_USB_TXS1_REG_USB_TCOUNT_Msk) && left_to_send > 0)
+    {
+      len = tu_fifo_get_linear_read_info(xfer->ff, 0, &src, left_to_send);  // We want to read from the FIFO
+      len1 = len;
+      while ((regs->txs & USB_USB_TXS1_REG_USB_TCOUNT_Msk) > 0 && len1 > 0)
+      {
+        regs->txd = *src++;
+        xfer->last_packet_size++;
+        len1--;
+      }
+      tu_fifo_advance_read_pointer(ff, len-len1);
+      left_to_send -= (len-len1);
+    }
   }
+  else
+  {
+    src = &xfer->buffer[xfer->transferred];
+    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 (epnum != 0)
   {
     if (left_to_send > 0)
@@ -363,13 +403,14 @@ static void start_rx_packet(xfer_ctl_t *xfer)
   xfer->last_packet_size = 0;
   if (xfer->max_packet_size > FIFO_SIZE && remaining > FIFO_SIZE)
   {
-    if (try_allocate_dma(epnum, TUSB_DIR_OUT))
+    if (try_allocate_dma(epnum, TUSB_DIR_OUT) && !xfer->ff)
     {
       start_rx_dma(&xfer->regs->rxd, xfer->buffer + xfer->transferred, size);
     }
     else
     {
       // Other endpoint is using DMA in that direction, fall back to interrupts.
+      // Or if an ISO EP transfer was scheduled, currently not handled by DMA!
       // 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;
@@ -409,7 +450,7 @@ static void start_tx_packet(xfer_ctl_t *xfer)
   regs->txc = USB_USB_TXC1_REG_USB_IGN_ISOMSK_Msk;
   if (xfer->data1) xfer->regs->txc |= USB_USB_TXC1_REG_USB_TOGGLE_TX_Msk;
 
-  if (xfer->max_packet_size > FIFO_SIZE && remaining > FIFO_SIZE && try_allocate_dma(epnum, TUSB_DIR_IN))
+  if (xfer->max_packet_size > FIFO_SIZE && remaining > FIFO_SIZE && try_allocate_dma(epnum, TUSB_DIR_IN) && !xfer->ff)
   {
     // Whole packet will be put in FIFO by DMA. Set LAST bit before start.
     start_tx_dma(xfer->buffer + xfer->transferred, &regs->txd, size);
@@ -430,9 +471,16 @@ static void read_rx_fifo(xfer_ctl_t *xfer, uint16_t bytes_in_fifo)
 
   if (remaining < bytes_in_fifo) receive_this_time = remaining;
 
-  uint8_t *buf = xfer->buffer + xfer->transferred + xfer->last_packet_size;
+  if (xfer->ff)
+  {
+    tu_fifo_write_n(xfer->ff, (const void *) &regs->rxd, receive_this_time);
+  }
+  else
+  {
+    uint8_t *buf = xfer->buffer + xfer->transferred + xfer->last_packet_size;
 
-  for (int i = 0; i < receive_this_time; ++i) buf[i] = regs->rxd;
+    for (int i = 0; i < receive_this_time; ++i) buf[i] = regs->rxd;
+  }
 
   xfer->last_packet_size += receive_this_time;
 }
@@ -918,6 +966,7 @@ bool dcd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t t
   (void)rhport;
 
   xfer->buffer = buffer;
+  xfer->ff     = NULL;
   xfer->total_len = total_bytes;
   xfer->last_packet_size = 0;
   xfer->transferred = 0;
@@ -934,6 +983,41 @@ bool dcd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t t
   return true;
 }
 
+bool dcd_edpt_iso_xfer (uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff, 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      = NULL;
+  xfer->ff          = ff;
+  xfer->total_len = total_bytes;
+  xfer->last_packet_size = 0;
+  xfer->transferred = 0;
+
+  if (dir == TUSB_DIR_IN)
+  {
+    tu_fifo_set_copy_mode_write(ff, TU_FIFO_COPY_CST);
+  }
+  else
+  {
+    tu_fifo_set_copy_mode_read(ff, TU_FIFO_COPY_CST);
+  }
+
+  if (dir == TUSB_DIR_OUT)
+  {
+    start_rx_packet(xfer);
+  }
+  else // IN
+  {
+    start_tx_packet(xfer);
+  }
+
+  return true;
+}
+
 void dcd_edpt_stall(uint8_t rhport, uint8_t ep_addr)
 {
   uint8_t const epnum = tu_edpt_number(ep_addr);
diff --git a/src/portable/st/synopsys/dcd_synopsys.c b/src/portable/st/synopsys/dcd_synopsys.c
index 5f8c44638..1d0bb5107 100644
--- a/src/portable/st/synopsys/dcd_synopsys.c
+++ b/src/portable/st/synopsys/dcd_synopsys.c
@@ -684,7 +684,7 @@ bool dcd_edpt_iso_xfer (uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff, uint16_
   uint8_t const dir   = tu_edpt_dir(ep_addr);
 
   xfer_ctl_t * xfer = XFER_CTL_BASE(epnum, dir);
-  xfer->buffer      = NULL;                                 // Indicates a FIFO shall be used
+  xfer->buffer      = NULL;
   xfer->ff          = ff;
   xfer->total_len   = total_bytes;