修改发送逻辑

examples/device/net_lwip_webserver/src/main.c

@@ -57,6 +57,7 @@ try changing the first byte of tud_network_mac_address[] below from 0x02 to 0x00
 
 #include "bsp/board_api.h"
 #include "tusb.h"
+#include "usbd_pvt.h"
 
 #include "dhserver.h"
 #include "dnserver.h"
@@ -103,6 +104,23 @@ static const dhcp_config_t dhcp_config = {
     entries                          /* entries */
 };
 
+
+
+
+
+static int tud_output_fn(void *t){
+  struct pbuf *p = t;
+    /* if the network driver can accept another packet, we make it happen */
+  if (tud_network_can_xmit(p->tot_len)) {
+    tud_network_xmit(p, 0 /* unused for this example */);
+    return ERR_OK;
+  }
+  return ERR_USE;
+}
+
+
+
+
 static err_t linkoutput_fn(struct netif *netif, struct pbuf *p) {
   (void) netif;
 
@@ -110,13 +128,8 @@ static err_t linkoutput_fn(struct netif *netif, struct pbuf *p) {
     /* if TinyUSB isn't ready, we must signal back to lwip that there is nothing we can do */
     if (!tud_ready())
       return ERR_USE;
-
-    /* if the network driver can accept another packet, we make it happen */
-    if (tud_network_can_xmit(p->tot_len)) {
-      tud_network_xmit(p, 0 /* unused for this example */);
-      return ERR_OK;
-    }
-    return ERR_USE;
+    /*rc  this packet will be sent in usbd task */
+    return usbd_defer_func_wait(tud_output_fn, p);
     /* transfer execution to TinyUSB in the hopes that it will finish transmitting the prior packet */
     /*rc: if use rtos, this function still will be called? */
     // tud_task();
@@ -124,6 +137,7 @@ static err_t linkoutput_fn(struct netif *netif, struct pbuf *p) {
 }
 
 static err_t ip4_output_fn(struct netif *netif, struct pbuf *p, const ip4_addr_t *addr) {
+  /*rc etharp_output() will call netif->linkoutput() */
   return etharp_output(netif, p, addr);
 }