Parallel output of 8bits

[buslik 0]

I have found working solution. But for me it look ugly.

    uint8_t command = 0x55;
    uint16_t u16Temp = 0;
    u16Temp = GPIO_ReadOutputData(GPIOA)&0xFF00;
    u16Temp |=  command;
    GPIO_Write(GPIOA, u16Temp);

Is there better way to output 8bit value to PORTA without affecting other pins?

[Bingo600 0]

I'm to lazy to look it up , but i'm quite sure there is some kind of "register mask" that can be set , so that any writes will only affect the low half of the port

 

/Bingo

[chicken 630]

HWREG is a macro that maps writes to specific pins to the proper memory-mapped GPIO.

 

Here someone wrapped it into a useful FAST_GPIOPinWrite macro:

http://forum.stellarisiti.com/topic/520-stellaris-gpiopinwrite-vs-hwreg/

 

Ignore, didn't realize this is the STM32 forum