#include "FreeRTOS.h"
#include "NUC200Series.h"
#include "pn512.h"
#include "task.h"

#define NFC_RESET_GPIO PA
#define NFC_RESET_PIN  BIT15

/* PN512 has a strange SPI timing, see DS § 9.2 */
/* **Stop it, Get some help.** */

pn512_ret_t nfc_impl_reset_ops(void *handle) {
    /* Clear nRSTPD */
    NFC_RESET_GPIO->DOUT &= ~(NFC_RESET_PIN);

    /* ..Sleep for a while */
    vTaskDelay(pdMS_TO_TICKS(5));

    /* Set nRSTPD */
    NFC_RESET_GPIO->DOUT |= NFC_RESET_PIN;

    return PN512_OK;
}

pn512_ret_t nfc_impl_delay_ops(void *handle, uint32_t msec) {
    /* .. */
    vTaskDelay(pdMS_TO_TICKS(msec));

    return PN512_OK;
}

pn512_ret_t nfc_impl_read_ops(void *handle, uint8_t reg, uint8_t *data, uint16_t len) {
    /*
     * SPI Read sequence(len + 1 bytes in total):
     * CS->LOW
     * MOSI send 1st address byte, ignore MISO data.
     * MISO receive `len` bytes, while MOSI repeats 1st byte data.
     * CS->HIGH
     */

    /* .. */

    return PN512_OK;
}

pn512_ret_t nfc_impl_write_ops(void *handle, uint8_t reg, uint8_t *data, uint16_t len) {
    /*
     * SPI Write sequence(len + 1 bytes in total):
     * CS->LOW
     * MOSI send 1st address byte, data payload follows.
     * CS->HIGH
     */

    /* .. */

    return PN512_OK;
}

pn512_ret_t pn512_poll_irq_ops(void *handle, uint32_t max_timeout) {
    /*
     * Poll for GPIO interrupt
     * (Get Semaphore)
     * 
     */

    /* .. */

    return PN512_OK;
}

/* <-- SPI0_IRQHandler --> */
void SPI0_IRQHandler(void) {
    /* DMA or FIFO xfer flags. */
    /* .. */
}

/* <-- EXTI --> */
void GPAB_IRQHandler(void) {
    /* ??? Sasuga Nuvoton */
}