I am turning on/off a LED using HAL_GPIO_WritePin() but still one of the LED showing dim even though its being RESET. any idea?

Forum|Forum|3 years ago
April 28, 2023
6 replies
1947 views

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GPIO-EXTI

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Peter BENSCH

ST Technical Moderator

Then a small current flows, which may well cause the LED to glow. Unfortunately, you have not included any initialisation code, but I suspect that one of the internal pull resistors is switched on or that current is flowing externally. What does your hardware look like around the LED?

Regards

/Peter

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cjaya.2Author

Associate III

 GPIO_InitStruct.Pin = GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15
 |GPIO_PIN_4|GPIO_PIN_8|GPIO_PIN_9;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

The GPIO_PIN_15 connected to the LED is showing dim light on even though is reset.

Peter BENSCH

ST Technical Moderator

And what about the hardware, i.e. the schematics around the LED?

How is it connected to the voltage?

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K

Kamil Duljas

Senior III

You have NOPULL - It means can pick up noise. Try set GPIO_PULLDOWN for GPIO_InitStruct.Pull

Dudo

Bob S

Super User

WHAT??????? That is nonsense. The pin is defined as out push-pull output. It will drive high or drive low. Enabling the internal pull up or pull down will only draw more current.

K

Kamil Duljas

Senior III

You right . I mistake with open drain. Soooorrrry :)

Dudo

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