GPIOS: Rotate pin

Just rotate a led turned on trough the pins C0 to C7.

The second parameter of function HAL_GPIO_WritePin indicates the pins to be written with a new value, each bit representing a pin. We just generate a mask with the << operand and the value of i on each iteration

#include "bsp.h"

int main(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;               /*gpios initial structure*/
    
    HAL_Init();                                     /*Init HAL library*/
    __HAL_RCC_GPIOC_CLK_ENABLE();                   /*Enable clock on port C*/
  
    GPIO_InitStruct.Pin = 0x00FFu;                  /*pins to set as outputs*/
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;     /*outputs on mode push-pull*/
    GPIO_InitStruct.Pull = GPIO_NOPULL;             /*no pull-up niether pull-down*/
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;    /*pins speed*/
    /*use the previous parameters to set configuration on pin C0 - C7*/
    HAL_GPIO_Init( GPIOC, &GPIO_InitStruct );
  
    /*Turn off the leds on port C from pin C0 to C7 as initial state*/
    HAL_GPIO_WritePin( GPIOC, 0x00FF, RESET ); 

    while(1)
    {
        /*Loop though all 8 pins one at the time every 200ms*/
        for( uint32_t i=0 ; i < 8u ; i++ )
        {
            /*pay atention to mask (1 << i)*/
            HAL_GPIO_WritePin( GPIOC, ( 1 << i ), SET );    /*turn on led in turn*/
            HAL_Delay( 200u );                              /*delay for 200ms*/
            HAL_GPIO_WritePin( GPIOC, ( 1 << i ), RESET );  /*turn off the led in turn*/
        }
    }
}