From 09d8ead4b86049260dd6ee7e61d137b6bdccaa28 Mon Sep 17 00:00:00 2001
From: Reinhard Panhuber <panhuber_reinhard@gmx.at>
Date: Mon, 4 Jan 2021 12:02:08 +0100
Subject: Start changes - not yet finished

---
 src/device/usbd.c     | 29 +++++++++++++++++++++++++++++
 src/device/usbd_pvt.h |  3 +++
 2 files changed, 32 insertions(+)

(limited to 'src/device')

diff --git a/src/device/usbd.c b/src/device/usbd.c
index 791d533ae..55e76bb66 100644
--- a/src/device/usbd.c
+++ b/src/device/usbd.c
@@ -1188,6 +1188,35 @@ bool usbd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t
   }
 }
 
+bool usbd_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);
+
+  TU_LOG2("  Queue ISO EP %02X with %u bytes ... ", ep_addr, total_bytes);
+
+  // Attempt to transfer on a busy endpoint, sound like an race condition !
+  TU_ASSERT(_usbd_dev.ep_status[epnum][dir].busy == 0);
+
+  // Set busy first since the actual transfer can be complete before dcd_edpt_xfer() could return
+  // and usbd task can preempt and clear the busy
+  _usbd_dev.ep_status[epnum][dir].busy = true;
+
+  if ( dcd_edpt_ISO_xfer(rhport, ep_addr, ff, total_bytes) )
+  {
+    TU_LOG2("OK\r\n");
+    return true;
+  }else
+  {
+    // DCD error, mark endpoint as ready to allow next transfer
+    _usbd_dev.ep_status[epnum][dir].busy = false;
+    _usbd_dev.ep_status[epnum][dir].claimed = 0;
+    TU_LOG2("failed\r\n");
+    TU_BREAKPOINT();
+    return false;
+  }
+}
+
 bool usbd_edpt_busy(uint8_t rhport, uint8_t ep_addr)
 {
   (void) rhport;
diff --git a/src/device/usbd_pvt.h b/src/device/usbd_pvt.h
index 212c3a202..de2f37281 100644
--- a/src/device/usbd_pvt.h
+++ b/src/device/usbd_pvt.h
@@ -72,6 +72,9 @@ void usbd_edpt_close(uint8_t rhport, uint8_t ep_addr);
 // Submit a usb transfer
 bool usbd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes);
 
+// Submit a usb ISO transfer by use of a FIFO (ring buffer)
+bool usbd_edpt_ISO_xfer(uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff, uint16_t total_bytes);
+
 // Claim an endpoint before submitting a transfer.
 // If caller does not make any transfer, it must release endpoint for others.
 bool usbd_edpt_claim(uint8_t rhport, uint8_t ep_addr);
-- 
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