Set/Reset a pin

minhthe2305 · ‎2009-10-29

Posted on October 29, 2009 at 22:40

Set/Reset a pin

minhthe2305 · ‎2011-05-17

Posted on May 17, 2011 at 13:28

Hi,

I am new with STM32F10X.

Could anyone show me how to set/reset a pin. For example PA3 of STM32F103VBH6.

I try GPIO_WriteBits / GPIO_SetBits / GPIO_ResetBits but it does not work?

Thank you very much.

johnfitzgerald9 · ‎2011-05-17

Posted on May 17, 2011 at 13:28

You may need to set up the GPIO pins with GPIOInit(). You need to enable the peripheral clock to the GPIO port with RCC_APB2PeriphClockCmd(). See main.c in the example GPIO_IOToggle in the peripheral library examples.

Once you have that working, if you want, you can just use the set / reset and set registers,

#define CLK GPIO_Pin_6

GPIOF->BSRR = CLK; //clock high

GPIOF->BRR = CLK; //clock low

The advantage of these is that the same bit definition can be used to set or clear a pin depending on whether you write to the BSRR or BRR register.

Hope this helps.

minhthe2305 · ‎2011-05-17

Posted on May 17, 2011 at 13:28

Thanks for your replying.

You are correct.

What I did is use:

- RCC_APB2PeriphClockCmd

- GPIO_Init(GPIOA, &GPIO_InitStructure);

- GPIO_SetBits + GPIO_ResetBits or GPIO_WriteBit

To read the data port pin, I use GPIO_ReadInputDataBit.

My code works now.

Thanks again.