unleashed-firmware/applications/main/nfc/nfc_cli.c

#include <furi.h>
#include <furi_hal.h>
#include <cli/cli_main_commands.h>
#include <lib/toolbox/args.h>
#include <lib/toolbox/hex.h>
#include <toolbox/pipe.h>

#include <furi_hal_nfc.h>

#define FLAG_EVENT (1 << 10)

static void nfc_cli_print_usage(void) {
    printf("Usage:\r\n");
    printf("nfc <cmd>\r\n");
    printf("Cmd list:\r\n");
    if(furi_hal_rtc_is_flag_set(FuriHalRtcFlagDebug)) {
        printf("\tfield\t - turn field on\r\n");
    }
}

static void nfc_cli_field(PipeSide* pipe, FuriString* args) {
    UNUSED(args);
    // Check if nfc worker is not busy
    if(furi_hal_nfc_is_hal_ready() != FuriHalNfcErrorNone) {
        printf("NFC chip failed to start\r\n");
        return;
    }

    furi_hal_nfc_acquire();
    furi_hal_nfc_low_power_mode_stop();
    furi_hal_nfc_poller_field_on();

    printf("Field is on. Don't leave device in this mode for too long.\r\n");
    printf("Press Ctrl+C to abort\r\n");

    while(!cli_is_pipe_broken_or_is_etx_next_char(pipe)) {
        furi_delay_ms(50);
    }

    furi_hal_nfc_low_power_mode_start();
    furi_hal_nfc_release();
}

static void execute(PipeSide* pipe, FuriString* args, void* context) {
    UNUSED(context);
    FuriString* cmd;
    cmd = furi_string_alloc();

    do {
        if(!args_read_string_and_trim(args, cmd)) {
            nfc_cli_print_usage();
            break;
        }
        if(furi_hal_rtc_is_flag_set(FuriHalRtcFlagDebug)) {
            if(furi_string_cmp_str(cmd, "field") == 0) {
                nfc_cli_field(pipe, args);
                break;
            }
        }

        nfc_cli_print_usage();
    } while(false);

    furi_string_free(cmd);
}

CLI_COMMAND_INTERFACE(nfc, execute, CliCommandFlagDefault, 1024, CLI_APPID);