sending data problem LWIP without RTOS

[Zek_De]

Hello,

I am trying to send data periodically as a client in MCU.I am using program called SocketTest v 3.0.0 from PC.Connection is OK but I can't see other values.These are my codes.

---------------------in main.c------------------------
 
#include "main.h"
#include "lwip.h"
#include "usart.h"
#include "gpio.h"
 
void SystemClock_Config(void);
void Soft_Timer0(uint32_t timeMs);
 
extern struct netif gnetif;
extern struct tcp_pcb *echoclient_pcb;
uint32_t softTimer0=0;
volatile uint8_t a=0;
char str[10] = "123456789";
 
int main(void)
{
 
 HAL_Init();
 SystemClock_Config();
 MX_GPIO_Init();
 MX_LWIP_Init();
 MX_USART1_UART_Init();
	User_Notification(&gnetif);
 
	
	
 while (1)
 {
		
		MX_LWIP_Process();
		DHCP_Periodic_Handle(&gnetif);
		if(a) Soft_Timer0(2000);
		
		
 }
 
}
/*******************************************************************************/
void Soft_Timer0(uint32_t timeMs)
{
 
	 static uint8_t cnt=0;
	 err_t wr_err = ERR_OK;
	
	 if(HAL_GetTick() - softTimer0 > timeMs) 
	 {
		 softTimer0 = HAL_GetTick();
		 
		 tcp_write(echoclient_pcb, &str[cnt], 1, 0x01);
		 wr_err = tcp_output(echoclient_pcb);
		 
		 if(wr_err == ERR_OK)
		 {
			 cnt++;		 
			 if(cnt == 9) cnt = 0;
		 }
		 
		 
 }
 
 
}
/*******************************************************************************/
void EXTI0_IRQHandler(void)
{
	err_t err=ERR_CONN;
 HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0);
	err = tcp_echoclient_connect();
	if(err == ERR_OK)
	{		
		tcp_write(echoclient_pcb, "\n", 1, 0x01);
		tcp_output(echoclient_pcb);
		a = 1;
		softTimer0 = HAL_GetTick();
	}
	
 
}

[Pavel A.]

Usually one doesn't want to call things like tcp_write from interrupt handlers.

[Piranha]

Not only one shouldn't want it but in this case, except for pbuf_free()/mem_free() under special configuration (not recommended), it's not allowed to call any other lwIP function from interrupts at all.

How about reading documentation?

https://www.nongnu.org/lwip/2_1_x/multithreading.html

As such, the list of functions that may be called from other threads or an ISR is very limited!

If SYS_LIGHTWEIGHT_PROT is set to 1 and LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT is set to 1, pbuf_free() may also be called from another thread or an ISR (since only then, mem_free - for PBUF_RAM - may be called from an ISR: otherwise, the HEAP is only protected by semaphores).

[Zek_De]

it doesn't change anything when I don't call it in interrupt.What is the proper method that I want?

[Zek_De]

Ok it works like that

void SystemClock_Config(void);
void Soft_Timer0(uint32_t timeMs);
void Run_One_Time(void);
 
extern struct netif gnetif;
extern struct tcp_pcb *echoclient_pcb;
uint32_t softTimer0=0;
volatile uint8_t a=0,timer0Start=0;
char str[10] = "123456789";
 
err_t err=ERR_CONN;
	
	
 
int main(void)
{
 
 HAL_Init();
 SystemClock_Config();
 MX_GPIO_Init();
 MX_LWIP_Init();
 MX_USART1_UART_Init();
	User_Notification(&gnetif);
 
 
	
 while (1)
 {
		
		MX_LWIP_Process();
		DHCP_Periodic_Handle(&gnetif);
 
		if(timer0Start)
		{
			Soft_Timer0(1);
		}
		
		Run_One_Time();
		
 }
 
}
/*******************************************************************************/
void Run_One_Time(void)
{
	static uint8_t systemOn=1,oneTime=0;
 
	if (a)
	{
		if (!oneTime)
		{
			err = tcp_echoclient_connect();
			if(err == ERR_OK)
			{
				softTimer0 = HAL_GetTick();
				timer0Start = 1;
				oneTime = 1;
			}
			else 
			{
				oneTime = 0;
				HAL_Delay(1000);
			}
			
		}
	}
	else
	{
		oneTime = 0;	
	}
	
}
/*******************************************************************************/
void Soft_Timer0(uint32_t timeMs)
{
 
	 static uint8_t cnt=0, var = 1;
	
	 if(HAL_GetTick() - softTimer0 > timeMs) 
	 {
		 softTimer0 = HAL_GetTick();
		 
		 
		 
		 if(var == 1)
		 {
			 err = tcp_write(echoclient_pcb, &str[cnt], 1, 0x01);
			 if(err == ERR_OK) var = 2;
		 }
		 if(var == 2)
		 {
			 err = tcp_output(echoclient_pcb);
			 if(err == ERR_OK) var = 3;
		 }
		 if(var == 3)
		 {
			 err = tcp_write(echoclient_pcb, "\n", 1, 0x01);
			 if(err == ERR_OK) var = 4;
		 }
		 if(var == 4)
		 {
			 err = tcp_output(echoclient_pcb);
			 if(err == ERR_OK) var = 5;
		 }
		 
		 if(var == 5)
		 {
			 cnt++;		 
			 if(cnt == 9) cnt = 0;
			 var = 1;
		 }
		 
		 
		 
		 
 }
 
 
}
/*******************************************************************************/
void EXTI0_IRQHandler(void)
{
	
 HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0);
	a = 1;
	
 
}

[Zek_De]

what about reading data from PC.How can I get them.There is no hardware interrupt as much as I understand in lwip.

[Piranha]

https://www.nongnu.org/lwip/2_1_x/group__tcp__raw.html#ga8afd0b316a87a5eeff4726dc95006ed0