em_gpio.c

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/***************************************************************************/
#include "em_gpio.h"

#if defined(GPIO_COUNT) && (GPIO_COUNT > 0)

/***************************************************************************/
/***************************************************************************/
/*******************************************************************************
 *******************************   DEFINES   ***********************************
 ******************************************************************************/

#define GPIO_DRIVEMODE_VALID(mode)    ((mode) <= 3)
#define GPIO_STRENGHT_VALID(strenght) (!((strenght) & \
                                         ~(_GPIO_P_CTRL_DRIVESTRENGTH_MASK \
                                           | _GPIO_P_CTRL_DRIVESTRENGTHALT_MASK)))

/*******************************************************************************
 **************************   GLOBAL FUNCTIONS   *******************************
 ******************************************************************************/

/***************************************************************************/
void GPIO_DbgLocationSet(unsigned int location)
{
#if defined ( _GPIO_ROUTE_SWLOCATION_MASK )
  EFM_ASSERT(location < AFCHANLOC_MAX);

  GPIO->ROUTE = (GPIO->ROUTE & ~_GPIO_ROUTE_SWLOCATION_MASK) |
                (location << _GPIO_ROUTE_SWLOCATION_SHIFT);
#else
  (void)location;
#endif
}

#if defined (_GPIO_P_CTRL_DRIVEMODE_MASK)
/***************************************************************************/
void GPIO_DriveModeSet(GPIO_Port_TypeDef port, GPIO_DriveMode_TypeDef mode)
{
  EFM_ASSERT(GPIO_PORT_VALID(port) && GPIO_DRIVEMODE_VALID(mode));

  GPIO->P[port].CTRL = (GPIO->P[port].CTRL & ~(_GPIO_P_CTRL_DRIVEMODE_MASK))
                       | (mode << _GPIO_P_CTRL_DRIVEMODE_SHIFT);
}
#endif

#if defined (_GPIO_P_CTRL_DRIVESTRENGTH_MASK)
/***************************************************************************/
void GPIO_DriveStrengthSet(GPIO_Port_TypeDef port,
                           GPIO_DriveStrength_TypeDef strength)
{
  EFM_ASSERT(GPIO_PORT_VALID(port) && GPIO_STRENGHT_VALID(strength));
  BUS_RegMaskedWrite(&GPIO->P[port].CTRL,
                     _GPIO_P_CTRL_DRIVESTRENGTH_MASK | _GPIO_P_CTRL_DRIVESTRENGTHALT_MASK,
                     strength);
}
#endif

/***************************************************************************/
void GPIO_ExtIntConfig(GPIO_Port_TypeDef port,
                       unsigned int pin,
                       unsigned int intNo,
                       bool risingEdge,
                       bool fallingEdge,
                       bool enable)
{
  uint32_t tmp = 0;
#if !defined(_GPIO_EXTIPINSELL_MASK)
  (void)pin;
#endif

  EFM_ASSERT(GPIO_PORT_PIN_VALID(port, pin));
#if defined(_GPIO_EXTIPINSELL_MASK)
  EFM_ASSERT(GPIO_INTNO_PIN_VALID(intNo, pin));
#endif

  /* There are two registers controlling the interrupt configuration:
   * The EXTIPSELL register controls pins 0-7 and EXTIPSELH controls
   * pins 8-15. */
  if (intNo < 8)
  {
    BUS_RegMaskedWrite(&GPIO->EXTIPSELL,
                       _GPIO_EXTIPSELL_EXTIPSEL0_MASK
                       << (_GPIO_EXTIPSELL_EXTIPSEL1_SHIFT * intNo),
                       port << (_GPIO_EXTIPSELL_EXTIPSEL1_SHIFT * intNo));
  }
  else
  {
    tmp = intNo - 8;
    BUS_RegMaskedWrite(&GPIO->EXTIPSELH,
                       _GPIO_EXTIPSELH_EXTIPSEL8_MASK
                       << (_GPIO_EXTIPSELH_EXTIPSEL9_SHIFT * tmp),
                       port << (_GPIO_EXTIPSELH_EXTIPSEL9_SHIFT * tmp));
  }

#if defined(_GPIO_EXTIPINSELL_MASK)
  /* There are two registers controlling the interrupt/pin number mapping:
   * The EXTIPINSELL register controls interrupt 0-7 and EXTIPINSELH controls
   * interrupt 8-15. */
  if (intNo < 8)
  {
    BUS_RegMaskedWrite(&GPIO->EXTIPINSELL,
                       _GPIO_EXTIPINSELL_EXTIPINSEL0_MASK
                       << (_GPIO_EXTIPINSELL_EXTIPINSEL1_SHIFT * intNo),
                       ((pin % 4) & _GPIO_EXTIPINSELL_EXTIPINSEL0_MASK)
                       << (_GPIO_EXTIPINSELL_EXTIPINSEL1_SHIFT * intNo));
  }
  else
  {
    BUS_RegMaskedWrite(&GPIO->EXTIPINSELH,
                       _GPIO_EXTIPINSELH_EXTIPINSEL8_MASK
                       << (_GPIO_EXTIPINSELH_EXTIPINSEL9_SHIFT * tmp),
                       ((pin % 4) & _GPIO_EXTIPINSELH_EXTIPINSEL8_MASK)
                       << (_GPIO_EXTIPSELH_EXTIPSEL9_SHIFT * tmp));
  }
#endif

  /* Enable/disable rising edge */
  BUS_RegBitWrite(&(GPIO->EXTIRISE), intNo, risingEdge);

  /* Enable/disable falling edge */
  BUS_RegBitWrite(&(GPIO->EXTIFALL), intNo, fallingEdge);

  /* Clear any pending interrupt */
  GPIO->IFC = 1 << intNo;

  /* Finally enable/disable interrupt */
  BUS_RegBitWrite(&(GPIO->IEN), intNo, enable);
}

/***************************************************************************/
void GPIO_PinModeSet(GPIO_Port_TypeDef port,
                     unsigned int pin,
                     GPIO_Mode_TypeDef mode,
                     unsigned int out)
{
  EFM_ASSERT(GPIO_PORT_PIN_VALID(port, 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_PinOutSet(port, pin);
    }
    else
    {
      GPIO_PinOutClear(port, 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 & ~(0xFu << (pin * 4)))
                          | (mode << (pin * 4));
  }
  else
  {
    GPIO->P[port].MODEH = (GPIO->P[port].MODEH & ~(0xFu << ((pin - 8) * 4)))
                          | (mode << ((pin - 8) * 4));
  }

  if (mode == gpioModeDisabled)
  {
    if (out)
    {
      GPIO_PinOutSet(port, pin);
    }
    else
    {
      GPIO_PinOutClear(port, pin);
    }
  }
}

/***************************************************************************/
GPIO_Mode_TypeDef GPIO_PinModeGet(GPIO_Port_TypeDef port,
                                  unsigned int pin)
{
  EFM_ASSERT(GPIO_PORT_PIN_VALID(port, pin));

  if (pin < 8)
  {
    return (GPIO_Mode_TypeDef) ((GPIO->P[port].MODEL >> (pin * 4)) & 0xF);
  }
  else
  {
    return (GPIO_Mode_TypeDef) ((GPIO->P[port].MODEH >> ((pin - 8) * 4)) & 0xF);
  }
}

#if defined( _GPIO_EM4WUEN_MASK )
/**************************************************************************/
void GPIO_EM4EnablePinWakeup(uint32_t pinmask, uint32_t polaritymask)
{
  EFM_ASSERT((pinmask & ~_GPIO_EM4WUEN_MASK) == 0);

#if defined( _GPIO_EM4WUPOL_MASK )
  EFM_ASSERT((polaritymask & ~_GPIO_EM4WUPOL_MASK) == 0);
  GPIO->EM4WUPOL &= ~pinmask;               /* Set wakeup polarity */
  GPIO->EM4WUPOL |= pinmask & polaritymask;
#elif defined( _GPIO_EXTILEVEL_MASK )
  EFM_ASSERT((polaritymask & ~_GPIO_EXTILEVEL_MASK) == 0);
  GPIO->EXTILEVEL &= ~pinmask;
  GPIO->EXTILEVEL |= pinmask & polaritymask;
#endif
  GPIO->EM4WUEN  |= pinmask;                /* Enable wakeup */

  GPIO_EM4SetPinRetention(true);            /* Enable pin retention */

#if defined( _GPIO_CMD_EM4WUCLR_MASK )
  GPIO->CMD = GPIO_CMD_EM4WUCLR;            /* Clear wake-up logic */
#elif defined( _GPIO_IFC_EM4WU_MASK )
  GPIO_IntClear(pinmask);
#endif
}
#endif

#endif /* defined(GPIO_COUNT) && (GPIO_COUNT > 0) */