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cxc8

Which is the correct way to initialize a union/struct?

I have got the following union:

typedef union
{
    struct
    {
        uint8_t LSB;
        uint8_t MSB;
    };
    int16_t     complete;
}uint16ByteT;

Know I want to use my type and initialize the variable. After scanning SO ( I thought) I found the solution:

uint16ByteT   myVariable  = {0};

But my compiler gives me an Error message:

simple type required for "@"

Normally the xc8 compiler uses the "@" to bring a variable at a specific address.

Solution

  • To initialize an anonym struct/union you can use:

    uint16ByteT myVariable = {{0}, .complete = 0};

    or simply

    uint16ByteT myVariable = {{0}};

    Notice uint16ByteT instead of uint16Byte

    Also notice that you need to compile in C11 mode since anonym structs/unions was introduced in this version.