program stucks when scanning 2 i2c (hi2c2 and hi2c3) using for loop

[SA.17]

I am using STM32L072RB MCU.

I am trying to scan the devices connected to i2c bus (i2c2 and i2c3)

following is my function

#define DEBUG 1
void i2c_scan(void)
{
	uint8_t *p_data;
		
	 uint16_t addr_scan = 3 ;
				
	printf("I2C3 Address : ");
 //scanning i2c devices from address 3 to address 127 in i2c3 of MCU
	for(addr_scan=3; addr_scan <=0x7F ; addr_scan++)
	{
		#if DEBUG
			printf("\r\naddr_scan : %d",addr_scan);
		#endif
		if(HAL_I2C_Master_Receive(&hi2c3,(uint16_t)(addr_scan << 1),p_data,1,500) != HAL_OK)
			{
				continue ;
			}
		
		printf(" 0x%x",(addr_scan << 1));
	
	}
	
 
		printf("\r\nI2C2 Address : ");
 //scanning i2c devices from address 3 to address 127 in i2c2 of MCU
	for(addr_scan=3; addr_scan <=0x7F ; addr_scan++)
	{
		#if DEBUG
			printf("\r\naddr_scan : %d",addr_scan);
		#endif
		if(HAL_I2C_Master_Receive(&hi2c2,(addr_scan << 1),p_data,1,500) != HAL_OK)
			{
				continue ;
			}
		printf(" 0x%x ",(addr_scan << 1));
	}
}

Issue :

If i use any one of the for loops (scanning only one i2c bus and commenting other for loop),the code works.

but if i run full i2c_scan() function i.e. not commenting any of for loops

code stucks

when i added print statement ,i found first loop stucks at count of 72 ,Even i tried debugging the code ,for loop doesn't increment at first increment itself.

Why is this happening ? and how to resolve it

[TDK · Accepted solution]

You're storing data at the address of an uninitialized pointer. May or may not be the issue. Where does the code actually get stuck?

[SA.17]

in first for loop at value of 72

[SA.17]

i initialized pointer ,now its working :)