GPIOS: Read single pin

Read a single pin.

There is no need for de-bounce code, it is assume the buttons in use comes with a hardware de bounce circuit, however a 50ms delay is used to established a decent polling time and avoid querying the button to often or losing a press action

#include "bsp.h"

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;               /*gpios initial structure*/
    uint32_t PinState;
    
    HAL_Init();                                     /*Init HAL library*/
    __HAL_RCC_GPIOB_CLK_ENABLE();                   /*Enable clock on port B*/
  
    GPIO_InitStruct.Pin = GPIO_PIN_5;               /*pin to set as output*/
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;         /*input mode*/
    GPIO_InitStruct.Pull = GPIO_NOPULL;             /*no pull-up niether pull-down*/
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;    /*pin speed*/
    /*use the previous parameters to set configuration on pin B5*/
    HAL_GPIO_Init( GPIOB, &GPIO_InitStruct );

    while(1)
    {
        /*Read the pin B5*/
        PinState = HAL_GPIO_ReadPin( GPIOB, GPIO_PIN_5 );
        
        if( PinState == RESET )
        {
            /*the pin is set to low, do something*/
        }
        /*this is just a delay to avoid polling the pin to often*/
        HAL_Delay( 50 );
    }
}