Can i write to the entire port to data

[thannara123]

Hai experts .

Can i wrte data to the  entire Port as follows

GPIOB->ODR |= 0x0000;
HAL_Delay(1000);
GPIOB->ODR |=0xffff;

Whenever i write like wise the SFR register shows correct value in Debug mode 

But in Hardware its not working .whats the wrong with me ?

[AScha.3]

or 0x0 -> GPIOB->ODR |= 0x0000; = nonsense.

need: GPIOB->ODR &= 0x0000;

[thannara123]

which also not working bro

[TDK]

> But in Hardware its not working .whats the wrong with me ?

Why don't you think it's working? You are probably misinterpreting something, or there is another issue.

 

[thannara123]

Just gives led to the port .not blingking

[TDK]

This code doesn't blink an LED. It does nothing (first line), waits a second then sets all outputs to high.

GPIOB->ODR |= 0x0000;
HAL_Delay(1000);
GPIOB->ODR |=0xffff;

There is no loop which would be needed to blink. It doesn't configure any pins as output which would also be needed to blink an LED. It doesn't configure any ports. It is also missing a second delay, which, if in a loop, would be needed to blink an LED.

Maybe you do these somewhere else in the program, maybe not.

[Tesla DeLorean]

The clocks for GPIOB need to be enabled, and the pin suitably configured.

You don't show any of that code. Suggest you use libraries until you've got a better mastery of this.

ORing ZERO is not how you clear bits.

You could use ODR or BSRR.  GPIOB->ODR &= ~GPIO_PIN_12; or GPIOB->BSRR = GPIO_PIN_12 << 16; // Clear

[Tesla DeLorean]

Which STM32 are you actually using? How is the LED wired up? Show a schematic. Show code.

[thannara123]

GPIOB->ODR = 0x0000;
HAL_Delay(1000);
GPIOB->ODR = 0xffff;
HAL_Delay(1000);

 

Changed as per above . 

GPIOB perpheral clock enabled ,GPIOB enabled as output .

external 8mhz clock is used . 

In debug mode the ODR 1,2,3 bit of PORT B changing as per programm 

But not refflect in hardware .

I think GPIOB->ODR canot write entire data 

[thannara123]

Here can see the data change in ODR regiter 

https://www.kapwing.com/651e24acbc4f1a6b8e3cdf61/studio/editor/sharing

[Danish1]

Which bit or pin in the port is your LED connected to?

Looking at the video I suspect the processor is stm32f103. But it would be useful if you could confirm that.

Is this a board that you designed and built? Or a commercial one (if so, please tell us which one)?

Do you have access to a voltmeter, so you can look at the voltage on the pins? That would help you to know if the problem is the software or the hardware (e.g. pin not soldered, LED the wrong way round).

[TDK]

> I think GPIOB->ODR canot write entire data 

> Here can see the data change in ODR regiter 

Aren't these statements at odds with each other? You can keep thinking that, but the issue is elsewhere. Still not seeing your full code.