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[SOLVED] problems with pointer to struct

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AliBahar

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Hi every one. I have typical structure (ECU_t) which has members that considered to be pointer to struct.
i make my question in c code comments. please help me. by the way i have used freescale code warrior as compiler.
Code: 
typedef enum
{
	NORMAL,
	WARNING,
}WATER_TEMP;

typedef struct
{
	WATER_TEMP water_temp;
	uint16_t speed;
	// ... other members
}Engine_t;

typedef struct
{
	Engine_t* engine;
	ABS_t*  abs;
	// ... other members
}ECU_t;

void ECU_DoTask(ECU_t* output)
{
	output->engine->water_temp = NORMAL; 
	
}

void main ()
{
	ECU_t ecu;
	ECU_DoTask(&ecu);
	// i want to access to water_temp. how can i do it?
	// if i use (ecu.engine->water_temp) there is no value (NORMAL) in variable.
	while(1);
}
 

ECU_t ecu; - is your local structure
ABS_t* abs; - is just a pointer having zero value or junk in the beggining

ABS_t _abs; - you should declare structure and then attach it to main structure

ecu.abs = &_abs;

or like this:
ECU_t ecu = { .abs = &_abs };
 
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