unleashed-firmware/targets/f7/furi_hal/furi_hal_nfc_felica.c

#include "furi_hal_nfc_i.h"
#include "furi_hal_nfc_tech_i.h"

// Prevent FDT timer from starting
#define FURI_HAL_NFC_FELICA_LISTENER_FDT_COMP_FC (INT32_MAX)

static FuriHalNfcError furi_hal_nfc_felica_poller_init(FuriHalSpiBusHandle* handle) {
    // Enable Felica mode, AM modulation
    st25r3916_change_reg_bits(
        handle,
        ST25R3916_REG_MODE,
        ST25R3916_REG_MODE_om_mask | ST25R3916_REG_MODE_tr_am,
        ST25R3916_REG_MODE_om_felica | ST25R3916_REG_MODE_tr_am_am);

    // 10% ASK modulation
    st25r3916_change_reg_bits(
        handle,
        ST25R3916_REG_TX_DRIVER,
        ST25R3916_REG_TX_DRIVER_am_mod_mask,
        ST25R3916_REG_TX_DRIVER_am_mod_10percent);

    // Use regulator AM, resistive AM disabled
    st25r3916_clear_reg_bits(
        handle,
        ST25R3916_REG_AUX_MOD,
        ST25R3916_REG_AUX_MOD_dis_reg_am | ST25R3916_REG_AUX_MOD_res_am);

    st25r3916_change_reg_bits(
        handle,
        ST25R3916_REG_BIT_RATE,
        ST25R3916_REG_BIT_RATE_txrate_mask | ST25R3916_REG_BIT_RATE_rxrate_mask,
        ST25R3916_REG_BIT_RATE_txrate_212 | ST25R3916_REG_BIT_RATE_rxrate_212);

    // Receive configuration
    st25r3916_write_reg(
        handle,
        ST25R3916_REG_RX_CONF1,
        ST25R3916_REG_RX_CONF1_lp0 | ST25R3916_REG_RX_CONF1_hz_12_80khz);

    // Correlator setup
    st25r3916_write_reg(
        handle,
        ST25R3916_REG_CORR_CONF1,
        ST25R3916_REG_CORR_CONF1_corr_s6 | ST25R3916_REG_CORR_CONF1_corr_s4 |
            ST25R3916_REG_CORR_CONF1_corr_s3);

    return FuriHalNfcErrorNone;
}

static FuriHalNfcError furi_hal_nfc_felica_poller_deinit(FuriHalSpiBusHandle* handle) {
    UNUSED(handle);

    return FuriHalNfcErrorNone;
}

static FuriHalNfcError furi_hal_nfc_felica_listener_init(FuriHalSpiBusHandle* handle) {
    furi_assert(handle);
    st25r3916_write_reg(
        handle,
        ST25R3916_REG_OP_CONTROL,
        ST25R3916_REG_OP_CONTROL_en | ST25R3916_REG_OP_CONTROL_rx_en |
            ST25R3916_REG_OP_CONTROL_en_fd_auto_efd);

    // Enable Target Felica mode, AM modulation
    st25r3916_write_reg(
        handle,
        ST25R3916_REG_MODE,
        ST25R3916_REG_MODE_targ_targ | ST25R3916_REG_MODE_om2 | ST25R3916_REG_MODE_tr_am);

    st25r3916_change_reg_bits(
        handle,
        ST25R3916_REG_BIT_RATE,
        ST25R3916_REG_BIT_RATE_txrate_mask | ST25R3916_REG_BIT_RATE_rxrate_mask,
        ST25R3916_REG_BIT_RATE_txrate_212 | ST25R3916_REG_BIT_RATE_rxrate_212);

    // Receive configuration
    st25r3916_write_reg(
        handle,
        ST25R3916_REG_RX_CONF1,
        ST25R3916_REG_RX_CONF1_lp0 | ST25R3916_REG_RX_CONF1_hz_12_80khz);

    // AGC enabled, ratio 3:1, squelch after TX
    st25r3916_write_reg(
        handle,
        ST25R3916_REG_RX_CONF2,
        ST25R3916_REG_RX_CONF2_agc6_3 | ST25R3916_REG_RX_CONF2_agc_m |
            ST25R3916_REG_RX_CONF2_agc_en | ST25R3916_REG_RX_CONF2_sqm_dyn);
    // HF operation, full gain on AM and PM channels
    st25r3916_write_reg(handle, ST25R3916_REG_RX_CONF3, 0x00);
    // No gain reduction on AM and PM channels
    st25r3916_write_reg(handle, ST25R3916_REG_RX_CONF4, 0x00);
    // 10% ASK modulation
    st25r3916_write_reg(handle, ST25R3916_REG_TX_DRIVER, ST25R3916_REG_TX_DRIVER_am_mod_10percent);

    // Correlator setup
    st25r3916_write_reg(
        handle,
        ST25R3916_REG_CORR_CONF1,
        ST25R3916_REG_CORR_CONF1_corr_s6 | ST25R3916_REG_CORR_CONF1_corr_s4 |
            ST25R3916_REG_CORR_CONF1_corr_s2);

    // Sleep mode disable, 424kHz mode off
    st25r3916_write_reg(handle, ST25R3916_REG_CORR_CONF2, 0x00);

    st25r3916_write_reg(handle, ST25R3916_REG_MASK_RX_TIMER, 0x02);

    st25r3916_direct_cmd(handle, ST25R3916_CMD_STOP);
    uint32_t interrupts =
        (ST25R3916_IRQ_MASK_FWL | ST25R3916_IRQ_MASK_TXE | ST25R3916_IRQ_MASK_RXS |
         ST25R3916_IRQ_MASK_RXE | ST25R3916_IRQ_MASK_PAR | ST25R3916_IRQ_MASK_CRC |
         ST25R3916_IRQ_MASK_ERR1 | ST25R3916_IRQ_MASK_ERR2 | ST25R3916_IRQ_MASK_NRE |
         ST25R3916_IRQ_MASK_EON | ST25R3916_IRQ_MASK_EOF | ST25R3916_IRQ_MASK_WU_A_X |
         ST25R3916_IRQ_MASK_WU_A);
    // Clear interrupts
    st25r3916_get_irq(handle);

    st25r3916_write_reg(
        handle,
        ST25R3916_REG_PASSIVE_TARGET,
        ST25R3916_REG_PASSIVE_TARGET_d_106_ac_a | ST25R3916_REG_PASSIVE_TARGET_d_ac_ap2p |
            ST25R3916_REG_PASSIVE_TARGET_fdel_1);
    // Enable interrupts
    st25r3916_mask_irq(handle, ~interrupts);
    st25r3916_direct_cmd(handle, ST25R3916_CMD_GOTO_SENSE);

    return FuriHalNfcErrorNone;
}

static FuriHalNfcError furi_hal_nfc_felica_listener_deinit(FuriHalSpiBusHandle* handle) {
    UNUSED(handle);
    return FuriHalNfcErrorNone;
}

static FuriHalNfcEvent furi_hal_nfc_felica_listener_wait_event(uint32_t timeout_ms) {
    UNUSED(timeout_ms);
    FuriHalNfcEvent event = furi_hal_nfc_wait_event_common(timeout_ms);

    return event;
}

FuriHalNfcError furi_hal_nfc_felica_listener_tx(
    FuriHalSpiBusHandle* handle,
    const uint8_t* tx_data,
    size_t tx_bits) {
    UNUSED(handle);
    UNUSED(tx_data);
    UNUSED(tx_bits);
    return FuriHalNfcErrorNone;
}

FuriHalNfcError furi_hal_nfc_felica_listener_sleep(FuriHalSpiBusHandle* handle) {
    UNUSED(handle);
    return FuriHalNfcErrorNone;
}

FuriHalNfcError furi_hal_nfc_felica_listener_idle(FuriHalSpiBusHandle* handle) {
    UNUSED(handle);
    return FuriHalNfcErrorNone;
}

FuriHalNfcError furi_hal_nfc_felica_listener_set_sensf_res_data(
    const uint8_t* idm,
    const uint8_t idm_len,
    const uint8_t* pmm,
    const uint8_t pmm_len) {
    furi_check(idm);
    furi_check(pmm);

    FuriHalSpiBusHandle* handle = &furi_hal_spi_bus_handle_nfc;
    // Write PT Memory
    uint8_t pt_memory[19] = {};
    pt_memory[2] = 0x01;
    memcpy(pt_memory + 3, idm, idm_len);
    memcpy(pt_memory + 3 + idm_len, pmm, pmm_len);
    st25r3916_write_ptf_mem(handle, pt_memory, sizeof(pt_memory));
    return FuriHalNfcErrorNone;
}

const FuriHalNfcTechBase furi_hal_nfc_felica = {
    .poller =
        {
            .compensation =
                {
                    .fdt = FURI_HAL_NFC_POLLER_FDT_COMP_FC,
                    .fwt = FURI_HAL_NFC_POLLER_FWT_COMP_FC,
                },
            .init = furi_hal_nfc_felica_poller_init,
            .deinit = furi_hal_nfc_felica_poller_deinit,
            .wait_event = furi_hal_nfc_wait_event_common,
            .tx = furi_hal_nfc_poller_tx_common,
            .rx = furi_hal_nfc_common_fifo_rx,
        },

    .listener =
        {
            .compensation =
                {
                    .fdt = FURI_HAL_NFC_FELICA_LISTENER_FDT_COMP_FC,
                },
            .init = furi_hal_nfc_felica_listener_init,
            .deinit = furi_hal_nfc_felica_listener_deinit,
            .wait_event = furi_hal_nfc_felica_listener_wait_event,
            .tx = furi_hal_nfc_felica_listener_tx,
            .rx = furi_hal_nfc_common_fifo_rx,
            .sleep = furi_hal_nfc_felica_listener_sleep,
            .idle = furi_hal_nfc_felica_listener_idle,
        },
};