LWIP Debug Messages Not Working

[lavanya]

I Enabled LWIP DEBUG options in CUBEMX

in lwipopt.h 

 

/* USER CODE BEGIN 1 */

#define LWIP_DEBUG 1

/* USER CODE END 1 */

 

in main.c 

 

int __io_putchar(int ch)
{
 ITM_SendChar(ch);
 return ch;
}

 

 But I am not getting anything in SWVITM Data Console

[ASEHST]

Hello @lavanya, 

 

With the #define LWIP_DEBUG 1, you should also define the specific topic you want to log. For example, to debug the dhcp.c file, you can add the following define:

 

 

#define DHCP_DEBUG LWIP_DBG_ON

 

This will enable debug messages for DHCP.

 

With Regards,

[Andrew Neil]

Did you follow this: https://community.st.com/t5/stm32-mcus/using-the-itm-console-for-printf-redirects-and-lwip-debug/ta-p/723472 ?

[lavanya]

 

#define LWIP_PLATFORM_DIAG(x) do {printf x;} while(0)
//added fflush after printing Now it's working
#define LWIP_PLATFORM_DIAG(x) do {printf x;fflush(0);} while(0)