feature(dcd): Check avaliable endpoints:

            - get IN/OUT endpoints max count
            - check avaliable endpoints while opening them

Author: peter-marcisovsky

src/portable/synopsys/dwc2/dcd_dwc2.c

@@ -630,6 +630,27 @@ void dcd_sof_enable(uint8_t rhport, bool en)
 /* DCD Endpoint port
  *------------------------------------------------------------------*/
 
+// Check is IN/OUT endpoint is avaliable before opening it
+static bool dcd_edpt_check_if_avaliable(uint8_t rhport, uint8_t direction)
+{
+  if (direction) {  // IN direction
+    if (ep_avaliable_count[rhport].in_ep < 1) {
+      TU_LOG(1, "Trying to open IN endpoint, but max number of IN endpoints already opened on this target \r\n");
+      return false;
+    }
+  } else {        // OUT direction
+    if (ep_avaliable_count[rhport].out_ep < 1) {
+      TU_LOG(1, "Trying to open OUT endpoint, but max number of OUT endpoints already opened on this target \r\n");
+      return false;
+    }
+  }
+
+  ep_avaliable_count[rhport].in_ep--;
+  ep_avaliable_count[rhport].out_ep--;
+
+  return true;
+}
+
 bool dcd_edpt_open (uint8_t rhport, tusb_desc_endpoint_t const * desc_edpt)
 {
   (void) rhport;
@@ -640,7 +661,7 @@ 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);
 
-  TU_ASSERT(epnum < ep_count);
+  TU_ASSERT(dcd_edpt_check_if_avaliable(rhport, dir));
 
   xfer_ctl_t * xfer = XFER_CTL_BASE(epnum, dir);
   xfer->max_size = tu_edpt_packet_size(desc_edpt);

src/portable/synopsys/dwc2/dwc2_esp32.h

@@ -55,7 +55,7 @@
 #endif
 
 #if DWC2_FS_PERIPH_BASE
-  #define DWC2_FS_EP_MAX       6             // USB_OUT_EP_NUM. TODO ESP32Sx only has 5 tx fifo (5 endpoint IN)
+  #define DWC2_FS_EP_MAX       6             // USB_OUT_EP_NUM
   #define DWC2_FS_EP_FIFO_SIZE 1024
 #endif
 
@@ -82,6 +82,22 @@ static const dwc2_controller_t _dwc2_controller[] =
 #endif
 };
 
+static ep_avaliable_count_t ep_avaliable_count[] =
+{
+#ifdef DWC2_FS_PERIPH_BASE
+// ESP32Sx has 6 endpoints, from which only 5 can be confiugred as IN
+#if TU_CHECK_MCU(OPT_MCU_ESP32S2, OPT_MCU_ESP32S3)
+  { .out_ep = DWC2_FS_EP_MAX, .in_ep = DWC2_FS_EP_MAX - 1},
+#else
+  { .out_ep = DWC2_FS_EP_MAX, .in_ep = DWC2_FS_EP_MAX},
+#endif
+#endif
+
+#ifdef DWC2_HS_PERIPH_BASE
+  { .out_ep = DWC2_HS_EP_MAX, .in_ep = DWC2_HS_EP_MAX},
+#endif
+};
+
 static intr_handle_t usb_ih[DWC2_PERIPH_COUNT];
 
 static void dcd_int_handler_wrap(void* arg)

src/portable/synopsys/dwc2/dwc2_type.h

@@ -32,6 +32,12 @@ typedef struct
   uint32_t  ep_fifo_size;
 }dwc2_controller_t;
 
+typedef struct
+{
+  int8_t out_ep;
+  int8_t in_ep;
+}ep_avaliable_count_t;
+
 /* DWC OTG HW Release versions */
 #define DWC2_CORE_REV_2_71a   0x4f54271a
 #define DWC2_CORE_REV_2_72a   0x4f54272a