pio_handler.c

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/*
 * Support and FAQ: visit <a href="https://www.microchip.com/support/">Microchip Support</a>
 */

#include "pio.h"
#include "pio_handler.h"

#define MAX_INTERRUPT_SOURCES       7

struct s_interrupt_source {
        uint32_t id;
        uint32_t mask;
        uint32_t attr;

        /* Interrupt handler. */
        void (*handler) (const uint32_t, const uint32_t);
};


/* List of interrupt sources. */
static struct s_interrupt_source gs_interrupt_sources[MAX_INTERRUPT_SOURCES];

/* Number of currently defined interrupt sources. */
static uint32_t gs_ul_nb_sources = 0;

#if (SAM3S || SAM4S || SAM4E)
/* PIO Capture handler */
static void (*pio_capture_handler)(Pio *) = NULL;
extern uint32_t pio_capture_enable_flag;
#endif

void pio_handler_process(Pio *p_pio, uint32_t ul_id)
{
        uint32_t status;
        uint32_t i;

        /* Read PIO controller status */
        status = pio_get_interrupt_status(p_pio);
        status &= pio_get_interrupt_mask(p_pio);

        /* Check pending events */
        if (status != 0) {
                /* Find triggering source */
                i = 0;
                while (status != 0) {
                        /* Source is configured on the same controller */
                        if (gs_interrupt_sources[i].id == ul_id) {
                                /* Source has PIOs whose statuses have changed */
                                if ((status & gs_interrupt_sources[i].mask) != 0) {
                                        gs_interrupt_sources[i].handler(gs_interrupt_sources[i].id,
                                                        gs_interrupt_sources[i].mask);
                                        status &= ~(gs_interrupt_sources[i].mask);
                                }
                        }
                        i++;
                        if (i >= MAX_INTERRUPT_SOURCES) {
                                break;
                        }
                }
        }

        /* Check capture events */
#if (SAM3S || SAM4S || SAM4E)
        if (pio_capture_enable_flag) {
                if (pio_capture_handler) {
                        pio_capture_handler(p_pio);
                }
        }
#endif
}

uint32_t pio_handler_set(Pio *p_pio, uint32_t ul_id, uint32_t ul_mask,
                uint32_t ul_attr, void (*p_handler) (uint32_t, uint32_t))
{
    uint8_t i;
        struct s_interrupt_source *pSource;

        if (gs_ul_nb_sources >= MAX_INTERRUPT_SOURCES)
                return 1;

    /* Check interrupt for this pin, if already defined, redefine it. */
        for (i = 0; i <= gs_ul_nb_sources; i++) {
                pSource = &(gs_interrupt_sources[i]);
                if (pSource->id == ul_id && pSource->mask == ul_mask) {
                        break;
                }
        }

        /* Define new source */
        pSource->id = ul_id;
        pSource->mask = ul_mask;
        pSource->attr = ul_attr;
        pSource->handler = p_handler;
        if (i == gs_ul_nb_sources + 1) {
                gs_ul_nb_sources++;
        }

        /* Configure interrupt mode */
        pio_configure_interrupt(p_pio, ul_mask, ul_attr);

        return 0;
}

#if (SAM3S || SAM4S || SAM4E)

void pio_capture_handler_set(void (*p_handler)(Pio *))
{
        pio_capture_handler = p_handler;
}
#endif

#ifdef ID_PIOA

uint32_t pio_handler_set_pin(uint32_t ul_pin, uint32_t ul_flag,
                void (*p_handler) (uint32_t, uint32_t))
{
        Pio *p_pio = pio_get_pin_group(ul_pin);
        uint32_t group_id =  pio_get_pin_group_id(ul_pin);
        uint32_t group_mask = pio_get_pin_group_mask(ul_pin);

        return pio_handler_set(p_pio, group_id, group_mask, ul_flag, p_handler);
}

void PIOA_Handler(void)
{
        pio_handler_process(PIOA, ID_PIOA);
}
#endif

#ifdef ID_PIOB

void PIOB_Handler(void)
{
    pio_handler_process(PIOB, ID_PIOB);
}
#endif

#ifdef ID_PIOC

void PIOC_Handler(void)
{
        pio_handler_process(PIOC, ID_PIOC);
}
#endif

#ifdef ID_PIOD

void PIOD_Handler(void)
{
        pio_handler_process(PIOD, ID_PIOD);
}
#endif

#ifdef ID_PIOE

void PIOE_Handler(void)
{
        pio_handler_process(PIOE, ID_PIOE);
}
#endif

#ifdef ID_PIOF

void PIOF_Handler(void)
{
        pio_handler_process(PIOF, ID_PIOF);
}
#endif

void pio_handler_set_priority(Pio *p_pio, IRQn_Type ul_irqn, uint32_t ul_priority)
{
        uint32_t bitmask = 0;

        bitmask = pio_get_interrupt_mask(p_pio);
        pio_disable_interrupt(p_pio, 0xFFFFFFFF);
        pio_get_interrupt_status(p_pio);
        NVIC_DisableIRQ(ul_irqn);
        NVIC_ClearPendingIRQ(ul_irqn);
        NVIC_SetPriority(ul_irqn, ul_priority);
        NVIC_EnableIRQ(ul_irqn);
        pio_enable_interrupt(p_pio, bitmask);
}