Function GPIO_PinModeSet

bsp/efm32/Libraries/emlib/src/em_gpio.c:224–269

/ * @brief * Set the mode for a GPIO pin. * * @param[in] port * The GPIO port to access. * * @param[in] pin * The pin number in the port. * * @param[in] mode * The desired pin mode. * * @param[in] out * Value to set for pin in DOUT register. The DOUT setting is important for * even some input mode configurations, determining pull-up/down direction. * Notice that this p

 *   corresponding DOUT bit unchanged.
 ******************************************************************************/
void GPIO_PinModeSet(GPIO_Port_TypeDef port,
                     unsigned int pin,
                     GPIO_Mode_TypeDef mode,
                     unsigned int out)
{
  EFM_ASSERT(GPIO_PORT_VALID(port) && GPIO_PIN_VALID(pin));

  /* If disabling pin, do not modify DOUT in order to reduce chance for */
  /* glitch/spike (may not be sufficient precaution in all use cases) */
  if (mode != gpioModeDisabled)
  {
    if (out)
    {
      GPIO->P[port].DOUTSET = 1 << pin;
    }
    else
    {
      GPIO->P[port].DOUTCLR = 1 << pin;
    }
  }

  /* There are two registers controlling the pins for each port. The MODEL
   * register controls pins 0-7 and MODEH controls pins 8-15. */
  if (pin < 8)
  {
    GPIO->P[port].MODEL = (GPIO->P[port].MODEL & ~(0xF << (pin * 4))) |
                          (mode << (pin * 4));
  }
  else
  {
    GPIO->P[port].MODEH = (GPIO->P[port].MODEH & ~(0xF << ((pin - 8) * 4))) |
                          (mode << ((pin - 8) * 4));
  }

  if (mode == gpioModeDisabled)
  {
    if (out)
    {
      GPIO->P[port].DOUTSET = 1 << pin;
    }
    else
    {
      GPIO->P[port].DOUTCLR = 1 << pin;
    }
  }
}


/***************************************************************************//**