gpiointerrupt.c

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/***************************************************************************/
#include "em_gpio.h"
#include "em_core.h"
#include "gpiointerrupt.h"
#include "em_assert.h"
#include "em_common.h"

/*******************************************************************************
 ********************************   MACROS   ***********************************
 ******************************************************************************/

/*******************************************************************************
 *******************************   STRUCTS   ***********************************
 ******************************************************************************/

typedef struct
{
  /* Pin number in range of 0 to 15 */
  uint32_t pin;

  /* Pointer to the callback function */
  GPIOINT_IrqCallbackPtr_t callback;

} GPIOINT_CallbackDesc_t;


/*******************************************************************************
 ********************************   GLOBALS   **********************************
 ******************************************************************************/

/* Array of user callbacks. One for each pin. */
static GPIOINT_IrqCallbackPtr_t gpioCallbacks[16] = {0};

/*******************************************************************************
 ******************************   PROTOTYPES   *********************************
 ******************************************************************************/
static void GPIOINT_IRQDispatcher(uint32_t iflags);

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

/***************************************************************************/
void GPIOINT_Init(void)
{
  NVIC_ClearPendingIRQ(GPIO_ODD_IRQn);
  NVIC_EnableIRQ(GPIO_ODD_IRQn);
  NVIC_ClearPendingIRQ(GPIO_EVEN_IRQn);
  NVIC_EnableIRQ(GPIO_EVEN_IRQn);
}


/***************************************************************************/
void GPIOINT_CallbackRegister(uint8_t pin, GPIOINT_IrqCallbackPtr_t callbackPtr)
{
  CORE_ATOMIC_SECTION(
    /* Dispatcher is used */
    gpioCallbacks[pin] = callbackPtr;
  )
}

/***************************************************************************/
static void GPIOINT_IRQDispatcher(uint32_t iflags)
{
  uint32_t irqIdx;
  GPIOINT_IrqCallbackPtr_t callback;

  /* check for all flags set in IF register */
  while(iflags)
  {
    irqIdx = SL_CTZ(iflags);

    /* clear flag*/
    iflags &= ~(1 << irqIdx);

    callback = gpioCallbacks[irqIdx];
    if (callback)
    {
      /* call user callback */
      callback(irqIdx);
    }
  }
}

/***************************************************************************/
void GPIO_EVEN_IRQHandler(void)
{
  uint32_t iflags;

  /* Get all even interrupts. */
  iflags = GPIO_IntGetEnabled() & 0x00005555;

  /* Clean only even interrupts. */
  GPIO_IntClear(iflags);

  GPIOINT_IRQDispatcher(iflags);
}


/***************************************************************************/
void GPIO_ODD_IRQHandler(void)
{
  uint32_t iflags;

  /* Get all odd interrupts. */
  iflags = GPIO_IntGetEnabled() & 0x0000AAAA;

  /* Clean only odd interrupts. */
  GPIO_IntClear(iflags);

  GPIOINT_IRQDispatcher(iflags);
}

/******** THE REST OF THE FILE IS DOCUMENTATION ONLY !**********************/