C pass a nested structure within a structure to a function? - c

Question

I have a address to a nested struct problem that I haven't been able to solve for a while right now.
So I have a ModuleStruct that holds a sensorStruct.
No problem to pass the address to the ModuleStruct in main. But when I do want to pass the address to the inner struct "SensorStruct" so readVoltage function can store the values, It fails.
Been googling and checking StackOverflow without finding anything that works. I hope I just done something stupid so it's easy to get it going.
Will be super happy if anyone could point me in the right direction (*puufh ;) )
typedef struct
{
int32_t Voltage;
int32_t Current;
}SensorStruct;
typedef struct
{
SensorStruct SensorData;
}ModuleStruct;
int main(void)
{
ModuleStruct Module_Data;
Sensor_Collect(&Module_Data);
}
void Sensor_Collect(ModuleStruct *Module_Data)
{
/// Here is the problem, I do not know how to pass the address of the SensorStruct
ReadVoltage(Module_Data->SensorData);
}
void ReadVoltage(SensorStruct *Sensor_Data)
{
Sensor_Data->Voltage = 5;
Sensor_Data->Current = 3;
}

Answer 1

Code that works. Take note that Sensor_Collect function is defined after ReadVoltage function, so it knows it's type when it calls it. Always compile your code with all warnings turned on.
#include <stdio.h>
#include <stdint.h>
typedef struct {
int32_t Voltage;
int32_t Current;
} SensorStruct;
typedef struct {
SensorStruct SensorData;
} ModuleStruct;
void ReadVoltage(SensorStruct *Sensor_Data) {
Sensor_Data->Voltage = 5;
Sensor_Data->Current = 3;
}
void Sensor_Collect(ModuleStruct *Module_Data) {
ReadVoltage(&(Module_Data->SensorData));
}
int main(void) {
ModuleStruct Module_Data;
Sensor_Collect(&Module_Data);
printf("voltage: %d\n", Module_Data.SensorData.Voltage);
printf("current: %d\n", Module_Data.SensorData.Current);
return 0;
}