feature(dcd): Add check for max number of endpoints

Author: peter-marcisovsky

src/device/dcd.h

@@ -190,6 +190,9 @@ TU_ATTR_WEAK bool dcd_edpt_iso_alloc(uint8_t rhport, uint8_t ep_addr, uint16_t l
 // Configure and enable an ISO endpoint according to descriptor
 TU_ATTR_WEAK bool dcd_edpt_iso_activate(uint8_t rhport,  tusb_desc_endpoint_t const * p_endpoint_desc);
 
+// Get max number of endpoints
+void dcd_get_edpt_max_count(uint8_t rhport, uint8_t *in_edpt_max_count, uint8_t *out_edpt_max_count);
+
 //--------------------------------------------------------------------+
 // Event API (implemented by stack)
 //--------------------------------------------------------------------+

src/device/usbd.c

@@ -297,6 +297,7 @@ tu_static osal_queue_t _usbd_q;
 static bool process_control_request(uint8_t rhport, tusb_control_request_t const * p_request);
 static bool process_set_config(uint8_t rhport, uint8_t cfg_num);
 static bool process_get_descriptor(uint8_t rhport, tusb_control_request_t const * p_request);
+static bool usbd_edpt_check_max_count(uint8_t rhport);
 
 // from usbd_control.c
 void usbd_control_reset(void);
@@ -396,6 +397,9 @@ bool tud_init (uint8_t rhport)
   // skip if already initialized
   if ( tud_inited() ) return true;
 
+  // check if required endpoint count is correct
+  TU_ASSERT(usbd_edpt_check_max_count(rhport));
+
   TU_LOG(USBD_DBG, "USBD init on controller %u\r\n", rhport);
   TU_LOG_INT(USBD_DBG, sizeof(usbd_device_t));
   TU_LOG_INT(USBD_DBG, sizeof(tu_fifo_t));
@@ -1420,4 +1424,25 @@ bool usbd_edpt_iso_activate(uint8_t rhport, tusb_desc_endpoint_t const * desc_ep
   return dcd_edpt_iso_activate(rhport, desc_ep);
 }
 
+static bool usbd_edpt_check_max_count(uint8_t rhport)
+{
+  uint8_t edpt_target_in_max = 0, edpt_target_out_max = 0;
+  dcd_get_edpt_max_count(rhport, &edpt_target_in_max, &edpt_target_out_max);
+  const uint8_t edpt_total_required_count = CFG_TUD_IN_EP_COUNT + CFG_TUD_OUT_EP_COUNT;
+  const uint8_t edpt_target_max = edpt_target_out_max;
+
+  if (edpt_total_required_count > edpt_target_max) {
+    TU_LOG(USBD_DBG, "Number of required endpoints: %d is more than max number of endpoints on target: %d\r\n", edpt_total_required_count, edpt_target_max);
+    return false;
+  }
+
+  // ESP32Sx has 6 endpoints, from which only 5 can be confiugred as IN
+  // check if the device has no more than 5 IN endpoints
+  if (CFG_TUD_IN_EP_COUNT > edpt_target_in_max) {
+    TU_LOG(USBD_DBG, "Number of required IN endpoints: %d is more than max number of IN endpoints on target: %d\r\n", CFG_TUD_IN_EP_COUNT, edpt_target_in_max);
+    return false;
+  }
+
+  return true;
+}
 #endif

src/device/usbd.h

@@ -858,6 +858,36 @@ TU_ATTR_WEAK bool tud_vendor_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb
   /* Endpoint Out */\
   7, TUSB_DESC_ENDPOINT, _epout, TUSB_XFER_BULK, U16_TO_U8S_LE(_epsize), 0
 
+//--------------------------------------------------------------------+
+// Calculate used endpoint count
+//--------------------------------------------------------------------+
+
+// Calculate used IN endpoints
+#define CFG_TUD_IN_EP_COUNT   2 * CFG_TUD_CDC + \
+                                  CFG_TUD_MSC + \
+                                  CFG_TUD_HID + \
+                                  CFG_TUD_MIDI + \
+                                  CFG_TUD_CUSTOM_CLASS + \
+                              2 * CFG_TUD_ECM_RNDIS + \
+                              2 * CFG_TUD_NCM + \
+                              2 * CFG_TUD_DFU + \
+                              2 * CFG_TUD_DFU_RUNTIME + \
+                              2 * CFG_TUD_BTH + \
+                                  CFG_TUD_BTH_ISO_ALT_COUNT
+
+// Calculate used OUT endpoints
+#define CFG_TUD_OUT_EP_COUNT      CFG_TUD_CDC + \
+                                  CFG_TUD_MSC + \
+                                  CFG_TUD_HID + \
+                                  CFG_TUD_MIDI + \
+                                  CFG_TUD_CUSTOM_CLASS + \
+                                  CFG_TUD_ECM_RNDIS + \
+                                  CFG_TUD_NCM + \
+                                  CFG_TUD_DFU + \
+                                  CFG_TUD_DFU_RUNTIME + \
+                                  CFG_TUD_BTH + \
+                                  CFG_TUD_BTH_ISO_ALT_COUNT
+
 #ifdef __cplusplus
 }
 #endif

src/portable/synopsys/dwc2/dcd_dwc2.c

@@ -923,6 +923,19 @@ void dcd_edpt_clear_stall (uint8_t rhport, uint8_t ep_addr)
   }
 }
 
+void dcd_get_edpt_max_count(uint8_t rhport, uint8_t *in_edpt_max_count, uint8_t *out_edpt_max_count)
+{
+  uint8_t const max_ep_count = _dwc2_controller[rhport].ep_count;
+
+  #if TU_CHECK_MCU(OPT_MCU_ESP32S2, OPT_MCU_ESP32S3)
+    *in_edpt_max_count = max_ep_count - 1;    // esp32Sx has only 5 IN endpoints
+    *out_edpt_max_count = max_ep_count;
+  #else
+    *in_edpt_max_count = max_ep_count;
+    *out_edpt_max_count = max_ep_count;
+  #endif
+}
+
 /*------------------------------------------------------------------*/
 
 // Read a single data packet from receive FIFO

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