fix: warnings

.vscode/settings.json

@@ -35,6 +35,9 @@
         "list": "c",
         "locale": "c",
         "regex": "c",
-        "vector": "c"
+        "vector": "c",
+        "memory_resource": "c",
+        "__config": "c",
+        "string": "c"
     }
 }

Makefile

@@ -40,8 +40,6 @@ ADDITIONAL_C_FILES := \
 	$(LWIP_C_FILES_WITH_PATH) \
 	$(LWIP_PORT_FILES)
 
-$(info Final ADDITIONAL_C_FILES is: [$(ADDITIONAL_C_FILES)])
-
 include $(CH32V003FUN)/ch32fun.mk
 
 CFLAGS += -Wall -Wextra $(INCLUDE_DIRS)

main.c

@@ -27,6 +27,7 @@
 #define STATS_PRINT_INTERVAL_MS 10000
 
 struct netif g_netif;
+static volatile int g_httpd_is_initialized = 0;
 
 int clock_init(void);
 void led_init(void);
@@ -76,9 +77,21 @@ void led_init(void) {
   GPIOA->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP) << (4 * LED2_PIN);
 }
 
+static void link_callback(struct netif* netif) {
+  if (netif_is_link_up(netif)) {
+    printf("Link is UP\n");
+    printf("Starting DHCP client...\n");
+    dhcp_start(netif);
+  } else {
+    printf("Link is DOWN\n");
+    printf("Stopping DHCP client...\n");
+    dhcp_stop(netif);
+  }
+}
+
 static void netif_status_callback(struct netif* netif) {
   if (netif_is_up(netif) && !ip_addr_isany_val(*netif_ip4_addr(netif))) {
-    printf("netif UP\n");
+    printf("netif is UP with a valid IP\n");
     printf("  MAC  : %02X:%02X:%02X:%02X:%02X:%02X\n", netif->hwaddr[0],
            netif->hwaddr[1], netif->hwaddr[2], netif->hwaddr[3],
            netif->hwaddr[4], netif->hwaddr[5]);
@@ -86,12 +99,17 @@ static void netif_status_callback(struct netif* netif) {
     printf("  Mask : %s\n", ip4addr_ntoa(netif_ip4_netmask(netif)));
     printf("  GW   : %s\n", ip4addr_ntoa(netif_ip4_gw(netif)));
 
-    httpd_init();
-    printf("HTTP server init\n");
+    if (!g_httpd_is_initialized) {
+      httpd_init();
+      printf("HTTP server initialized\n");
+      g_httpd_is_initialized = 1;
+    }
+
     GPIOA->BSHR = (1 << LED2_PIN);
 
   } else {
-    printf("netif DOWN or has no IP address\n");
+    printf("netif is DOWN or has no IP address\n");
+
     GPIOA->BSHR = (1 << (LED2_PIN + 16));
   }
 }
@@ -109,12 +127,10 @@ void lwip_stack_init(void) {
             &ethernet_input);
 
   netif_set_status_callback(&g_netif, netif_status_callback);
+  netif_set_link_callback(&g_netif, link_callback);
 
   netif_set_default(&g_netif);
   netif_set_up(&g_netif);
-
-  printf("Starting DHCP client...\n");
-  dhcp_start(&g_netif);
 }
 
 #if LWIP_STATS
@@ -155,7 +171,9 @@ int main() {
 
   uint32_t last_led_toggle_time = 0;
   uint32_t last_link_poll_time = 0;
+#if LWIP_STATS
   uint32_t last_stats_print_time = 0;
+#endif
   int led_state = 0;
 
   while (1) {

port/ethernetif.c

@@ -124,11 +124,9 @@ static void low_level_init(struct netif* netif) {
   ETH10M->ERXST = ethernetif->DMARxDescToGet->Buffer1Addr;
   ETH10M->ECON1 = RB_ETH_ECON1_RXEN;
 
-  printf("Resetting PHY...\n");
   WritePHYReg(PHY_BMCR, PHY_BMCR_RESET);
   Delay_Ms(200);
 
-  printf("Starting PHY, Mode: 10BASE_T_FD\n");
   WritePHYReg(PHY_BMCR, PHY_BMCR_FULL_DUPLEX);
 
   ETH10M->EIR = 0xFF;  // clear all interrupt flags
@@ -136,14 +134,13 @@ static void low_level_init(struct netif* netif) {
                 RB_ETH_EIE_TXERIE | RB_ETH_EIE_RXERIE | RB_ETH_EIE_R_EN50;
 
   NVIC_EnableIRQ(ETH_IRQn);
-  printf("low_level_init: done\n");
 }
 
 static err_t low_level_output(struct netif* netif, struct pbuf* p) {
+  (void)netif;
+
   if (DMATxDscrTab[0].Status & ETH_DMATxDesc_OWN) {
-#if LWIP_STATS
     LINK_STATS_INC(link.drop);
-#endif
     return ERR_BUF;
   }
 
@@ -160,9 +157,7 @@ static err_t low_level_output(struct netif* netif, struct pbuf* p) {
   DMATxDscrTab[0].Status |= ETH_DMATxDesc_OWN;
   ETH10M->ECON1 |= RB_ETH_ECON1_TXRTS;
 
-#if LWIP_STATS
   LINK_STATS_INC(link.xmit);
-#endif
   MIB2_STATS_NETIF_ADD(netif, ifoutoctets, len);
 
   return ERR_OK;
@@ -178,9 +173,7 @@ static struct pbuf* low_level_input(struct netif* netif) {
   uint16_t len = ETH10M->ERXLN;
 
   if (len < MIN_ETH_FRAME_SIZE || len > ETH_MAX_PACKET_SIZE) {
-#if LWIP_STATS
     LINK_STATS_INC(link.lenerr);
-#endif
     ETH10M->EIR = RB_ETH_EIR_RXIF;
     ETH10M->ECON1 |= RB_ETH_ECON1_RXEN;
     return NULL;
@@ -196,15 +189,11 @@ static struct pbuf* low_level_input(struct netif* netif) {
       memcpy(q->payload, current_rx_buffer_ptr + offset, q->len);
       offset += q->len;
     }
-#if LWIP_STATS
     LINK_STATS_INC(link.recv);
-#endif
     MIB2_STATS_NETIF_ADD(netif, ifinoctets, len);
   } else {
-#if LWIP_STATS
     LINK_STATS_INC(link.memerr);
     LINK_STATS_INC(link.drop);
-#endif
     MIB2_STATS_NETIF_INC(netif, ifindiscards);
   }
 
@@ -237,13 +226,11 @@ void ethernetif_link_poll(struct netif* netif) {
 
   if (bmsr & PHY_BMSR_LINK_STATUS) {
     if (!netif_is_link_up(netif)) {
-      printf("Link is UP\n");
       ETH10M->MACON2 |= RB_ETH_MACON2_FULDPX;
       netif_set_link_up(netif);
     }
   } else {
     if (netif_is_link_up(netif)) {
-      printf("Link is DOWN\n");
       netif_set_link_down(netif);
     }
   }
@@ -261,17 +248,13 @@ void ETH_IRQHandler(void) {
   if (flags & RB_ETH_EIR_TXERIF) {
     DMATxDscrTab[0].Status &= ~ETH_DMATxDesc_OWN;
     ETH10M->EIR = RB_ETH_EIR_TXERIF;
-#if LWIP_STATS
     LINK_STATS_INC(link.err);
-#endif
   }
 
   if (flags & RB_ETH_EIR_RXERIF) {
     ETH10M->EIR = RB_ETH_EIR_RXERIF;
     ETH10M->ECON1 |= RB_ETH_ECON1_RXEN;
-#if LWIP_STATS
     LINK_STATS_INC(link.err);
-#endif
   }
 
   if (flags & RB_ETH_EIR_LINKIF) {
@@ -282,7 +265,7 @@ void ETH_IRQHandler(void) {
 
 void WritePHYReg(uint8_t reg_add, uint16_t reg_val) {
   R32_ETH_MIWR = (reg_add & RB_ETH_MIREGADR_MASK) | RB_ETH_MIWR_MIIWR |
-                 RB_ETH_MIWR_DATA_SHIFT;
+                 (reg_val << RB_ETH_MIWR_DATA_SHIFT);
 }
 
 uint16_t ReadPHYReg(uint8_t reg_add) {

port/lwipopts.h

@@ -50,8 +50,9 @@
 #define LWIP_SOCKET 0
 
 // Statistics
-#define LWIP_STATS 1
-#define LINK_STATS 1
+#define LWIP_STATS 0
+#define LINK_STATS 0
+#define MIB2_STATS 0
 
 #define LWIP_HTTPD 1
 // Use a read-only filesystem populated by makefsdata
@@ -60,7 +61,7 @@
 #define HTTPD_USE_CUSTOM_FSDATA 1
 
 #define LWIP_NETIF_HOSTNAME 1
-// #define LWIP_NETIF_LINK_CALLBACK 1
+#define LWIP_NETIF_LINK_CALLBACK 1
 #define LWIP_NETIF_STATUS_CALLBACK 1
 
 #define LWIP_SUPPORT_CUSTOM_PBUF 1