[ARM] stm32f3, writebit, but no signal out. why?

[matise]

I need to send a series of bits, one at at time throu GPIOc port c6-c9.
I will show you the part of code that is intresting here.

I will use this ports:
PC9 - W_CLK
PC8 - FQ_UD
PC7 - DATA
PC6 - RESET

I use push pull and speed 2 MHz.
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

And this is the bits i will send throu PortC7 from right to left:
char frequency = 0x0A3D70A4; // 5MHz

Here is part of the code for sending data out PC7:

---

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for (n=0; n<32; n++)
    {
               frequency & 0x1 == 1;
        
        if ((frequency & 0x1) == 1)                                      // set data pin (2) to 1 or 0
        {
            GPIO_WriteBit(GPIOC, GPIO_Pin_7, Bit_SET);       // set data pin (2) to 1
        }
        else
        {
             GPIO_WriteBit(GPIOC, GPIO_Pin_7, Bit_RESET);    // set data pin (2) to 0
        }

---

And later:

frequency>>=1; // shift one bit...

A simple code but there is no signal out.
Nothing comes out from port C7.

So what is it i do wrong here?
What is it i dont understand?
Do i need some other Mode out?
Or maybe i cant use WriteBit this way?

Someone have a clue about this?