unleashed-firmware/applications/nfc/nfc_worker.c

#include "nfc_worker.h"
#include "nfc.h"
#include "nfc_i.h"

#define EXAMPLE_NFCA_DEVICES 5

// TODO replace with pubsub
static bool isr_enabled = false;

void nfc_isr() {
    if(isr_enabled) {
        st25r3916Isr();
    }
}

void nfc_worker_task(void* context) {
    Nfc* nfc = context;
    ReturnCode err;
    rfalNfcaSensRes sensRes;
    rfalNfcaSelRes selRes;
    rfalNfcaListenDevice nfcaDevList[EXAMPLE_NFCA_DEVICES];
    uint8_t devCnt;
    uint8_t devIt;

    rfalLowPowerModeStop();

    isr_enabled = true;

    while(widget_is_enabled(nfc->widget)) {
        rfalFieldOff();
        platformDelay(500);
        nfc->current = "Not detected";
        nfc->devCnt = 0;

        rfalNfcaPollerInitialize();
        rfalFieldOnAndStartGT();
        nfc->ret = err = rfalNfcaPollerTechnologyDetection(RFAL_COMPLIANCE_MODE_NFC, &sensRes);
        if(err == ERR_NONE) {
            err = rfalNfcaPollerFullCollisionResolution(
                RFAL_COMPLIANCE_MODE_NFC, EXAMPLE_NFCA_DEVICES, nfcaDevList, &devCnt);
            nfc->devCnt = devCnt;
            if((err == ERR_NONE) && (devCnt > 0)) {
                platformLog("NFC-A device(s) found %d\r\n", devCnt);
                devIt = 0;
                if(nfcaDevList[devIt].isSleep) {
                    err = rfalNfcaPollerCheckPresence(
                        RFAL_14443A_SHORTFRAME_CMD_WUPA, &sensRes); /* Wake up all cards  */
                    if(err != ERR_NONE) {
                        continue;
                    }
                    err = rfalNfcaPollerSelect(
                        nfcaDevList[devIt].nfcId1,
                        nfcaDevList[devIt].nfcId1Len,
                        &selRes); /* Select specific device  */
                    if(err != ERR_NONE) {
                        continue;
                    }
                }

                nfc->first_atqa = nfcaDevList[devIt].sensRes;
                nfc->first_sak = nfcaDevList[devIt].selRes;

                switch(nfcaDevList[devIt].type) {
                case RFAL_NFCA_T1T:
                    /* No further activation needed for a T1T (RID already performed)*/
                    platformLog(
                        "NFC-A T1T device found \r\n"); /* NFC-A T1T device found, NFCID/UID is contained in: t1tRidRes.uid */
                    nfc->current = "NFC-A T1T";
                    /* Following communications shall be performed using:
                         *   - Non blocking: rfalStartTransceive() + rfalGetTransceiveState()
                         *   -     Blocking: rfalTransceiveBlockingTx() + rfalTransceiveBlockingRx() or rfalTransceiveBlockingTxRx()    */
                    break;
                case RFAL_NFCA_T2T:
                    /* No specific activation needed for a T2T */
                    platformLog(
                        "NFC-A T2T device found \r\n"); /* NFC-A T2T device found, NFCID/UID is contained in: nfcaDev.nfcid */
                    nfc->current = "NFC-A T2T";
                    /* Following communications shall be performed using:
                         *   - Non blocking: rfalStartTransceive() + rfalGetTransceiveState()
                         *   -     Blocking: rfalTransceiveBlockingTx() + rfalTransceiveBlockingRx() or rfalTransceiveBlockingTxRx()    */
                    break;
                case RFAL_NFCA_T4T:
                    platformLog(
                        "NFC-A T4T (ISO-DEP) device found \r\n"); /* NFC-A T4T device found, NFCID/UID is contained in: nfcaDev.nfcid */
                    nfc->current = "NFC-A T4T";
                    /* Activation should continue using rfalIsoDepPollAHandleActivation(), see exampleRfalPoller.c */
                    break;
                case RFAL_NFCA_T4T_NFCDEP: /* Device supports T4T and NFC-DEP */
                case RFAL_NFCA_NFCDEP: /* Device supports NFC-DEP */
                    platformLog(
                        "NFC-A P2P (NFC-DEP) device found \r\n"); /* NFC-A P2P device found, NFCID/UID is contained in: nfcaDev.nfcid */
                    nfc->current = "NFC-A P2P";
                    /* Activation should continue using rfalNfcDepInitiatorHandleActivation(), see exampleRfalPoller.c */
                    break;
                }
                rfalNfcaPollerSleep(); /* Put device to sleep / HLTA (useless as the field will be turned off anyhow) */
            }
        }
        widget_update(nfc->widget);
    }

    isr_enabled = false;
    rfalFieldOff();
    rfalLowPowerModeStart();
    nfc->ret = ERR_NONE;
    nfc->worker = NULL;
    osThreadExit();
}