Easyelectronics.ru

void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_Pin_TypeDef GPIO_Pin, GPIO_Mode_TypeDef GPIO_Mode)
{
/*----------------------*/
/* Check the parameters */
/*----------------------*/

assert_param(IS_GPIO_MODE_OK(GPIO_Mode));
assert_param(IS_GPIO_PIN_OK(GPIO_Pin));

/* Reset corresponding bit to GPIO_Pin in CR2 register */
GPIOx->CR2 &= (uint8_t)(~(GPIO_Pin));

/*-----------------------------*/
/* Input/Output mode selection */
/*-----------------------------*/

if ((((uint8_t)(GPIO_Mode)) & (uint8_t)0x80) != (uint8_t)0x00) /* Output mode */
{
if ((((uint8_t)(GPIO_Mode)) & (uint8_t)0x10) != (uint8_t)0x00) /* High level */
{
GPIOx->ODR |= (uint8_t)GPIO_Pin;
}
else /* Low level */
{
GPIOx->ODR &= (uint8_t)(~(GPIO_Pin));
}
/* Set Output mode */
GPIOx->DDR |= (uint8_t)GPIO_Pin;
}
else /* Input mode */
{
/* Set Input mode */
GPIOx->DDR &= (uint8_t)(~(GPIO_Pin));
}

/*------------------------------------------------------------------------*/
/* Pull-Up/Float (Input) or Push-Pull/Open-Drain (Output) modes selection */
/*------------------------------------------------------------------------*/

if ((((uint8_t)(GPIO_Mode)) & (uint8_t)0x40) != (uint8_t)0x00) /* Pull-Up or Push-Pull */
{
GPIOx->CR1 |= (uint8_t)GPIO_Pin;
}
else /* Float or Open-Drain */
{
GPIOx->CR1 &= (uint8_t)(~(GPIO_Pin));
}

/*-----------------------------------------------------*/
/* Interrupt (Input) or Slope (Output) modes selection */
/*-----------------------------------------------------*/

if ((((uint8_t)(GPIO_Mode)) & (uint8_t)0x20) != (uint8_t)0x00) /* Interrupt or Slow slope */
{
GPIOx->CR2 |= (uint8_t)GPIO_Pin;
}
else /* No external interrupt or No slope control */
{
GPIOx->CR2 &= (uint8_t)(~(GPIO_Pin));
}
}