STM32H743ZI ETHERNET+USB USING

[SITARAM]

 I am USING BOTH ETHERNET+USB IN STM32H743ZI  WHEN I CONNECT ETHERNET THEN NORMAL BUFFER UPDATE PROBLEM OCCURING 

cnt_10=11;                                                      ///this buffer is updated     

MX_LWIP_Init(); //ETHERNET

HAL_Delay(10);

cnt_10=12;                                                      //this buffer is not updated

cnt_10=11;                                                     ///this buffer is updated                                            

buffer is updated but after calling MX LWIP Init(); then cnt_10=12 not updated why ?? inside calling mx_lwip_init();

after calling mx_lwip_init();

cnt_10=15;                                                 //this buffer is updated
netif_add(&gnetif, &ipaddr, &netmask, &gw, NULL, &ethernetif_init, &ethernet_input);
cnt_10=12;                                                 //this buffer is not updated

above netif_add(&gnetif, &ipaddr, &netmask, &gw, NULL, &ethernetif_init, &ethernet_input); i used cnt_10=15 buffer updated but after below  this  cnt_10=12 buffer not updated why??? give me proper solution.

[Pavel A.]

Buffer? Which buffer?

[SITARAM]

cnt_10=12; not update