unleashed-firmware/lib/one_wire/ibutton/ibutton_worker_modes.c

#include <furi.h>
#include <furi_hal.h>
#include "ibutton_worker_i.h"
#include "ibutton_key_command.h"

void ibutton_worker_mode_idle_start(iButtonWorker* worker);
void ibutton_worker_mode_idle_tick(iButtonWorker* worker);
void ibutton_worker_mode_idle_stop(iButtonWorker* worker);

void ibutton_worker_mode_emulate_start(iButtonWorker* worker);
void ibutton_worker_mode_emulate_tick(iButtonWorker* worker);
void ibutton_worker_mode_emulate_stop(iButtonWorker* worker);

void ibutton_worker_mode_read_start(iButtonWorker* worker);
void ibutton_worker_mode_read_tick(iButtonWorker* worker);
void ibutton_worker_mode_read_stop(iButtonWorker* worker);

void ibutton_worker_mode_write_start(iButtonWorker* worker);
void ibutton_worker_mode_write_tick(iButtonWorker* worker);
void ibutton_worker_mode_write_stop(iButtonWorker* worker);

const iButtonWorkerModeType ibutton_worker_modes[] = {
    {
        .quant = FuriWaitForever,
        .start = ibutton_worker_mode_idle_start,
        .tick = ibutton_worker_mode_idle_tick,
        .stop = ibutton_worker_mode_idle_stop,
    },
    {
        .quant = 100,
        .start = ibutton_worker_mode_read_start,
        .tick = ibutton_worker_mode_read_tick,
        .stop = ibutton_worker_mode_read_stop,
    },
    {
        .quant = 1000,
        .start = ibutton_worker_mode_write_start,
        .tick = ibutton_worker_mode_write_tick,
        .stop = ibutton_worker_mode_write_stop,
    },
    {
        .quant = 1000,
        .start = ibutton_worker_mode_emulate_start,
        .tick = ibutton_worker_mode_emulate_tick,
        .stop = ibutton_worker_mode_emulate_stop,
    },
};

/*********************** IDLE ***********************/

void ibutton_worker_mode_idle_start(iButtonWorker* worker) {
    UNUSED(worker);
}

void ibutton_worker_mode_idle_tick(iButtonWorker* worker) {
    UNUSED(worker);
}

void ibutton_worker_mode_idle_stop(iButtonWorker* worker) {
    UNUSED(worker);
}

/*********************** READ ***********************/

typedef struct {
    uint32_t last_dwt_value;
    FuriStreamBuffer* stream;
} iButtonReadContext;

void ibutton_worker_comparator_callback(bool level, void* context) {
    iButtonReadContext* read_context = context;

    uint32_t current_dwt_value = DWT->CYCCNT;

    LevelDuration data =
        level_duration_make(level, current_dwt_value - read_context->last_dwt_value);
    furi_stream_buffer_send(read_context->stream, &data, sizeof(LevelDuration), 0);

    read_context->last_dwt_value = current_dwt_value;
}

bool ibutton_worker_read_comparator(iButtonWorker* worker) {
    bool result = false;

    protocol_dict_decoders_start(worker->protocols);

    furi_hal_rfid_pins_reset();
    // pulldown pull pin, we sense the signal through the analog part of the RFID schematic
    furi_hal_rfid_pin_pull_pulldown();

    iButtonReadContext read_context = {
        .last_dwt_value = DWT->CYCCNT,
        .stream = furi_stream_buffer_alloc(sizeof(LevelDuration) * 512, 1),
    };

    furi_hal_rfid_comp_set_callback(ibutton_worker_comparator_callback, &read_context);
    furi_hal_rfid_comp_start();

    uint32_t tick_start = furi_get_tick();
    while(true) {
        LevelDuration level;
        size_t ret =
            furi_stream_buffer_receive(read_context.stream, &level, sizeof(LevelDuration), 100);

        if((furi_get_tick() - tick_start) > 100) {
            break;
        }

        if(ret > 0) {
            ProtocolId decoded_index = protocol_dict_decoders_feed(
                worker->protocols,
                level_duration_get_level(level),
                level_duration_get_duration(level));

            if(decoded_index == PROTOCOL_NO) continue;

            protocol_dict_get_data(
                worker->protocols, decoded_index, worker->key_data, ibutton_key_get_max_size());

            switch(decoded_index) {
            case iButtonProtocolCyfral:
                furi_check(worker->key_p != NULL);
                ibutton_key_set_type(worker->key_p, iButtonKeyCyfral);
                ibutton_key_set_data(worker->key_p, worker->key_data, ibutton_key_get_max_size());
                result = true;
                break;
            case iButtonProtocolMetakom:
                furi_check(worker->key_p != NULL);
                ibutton_key_set_type(worker->key_p, iButtonKeyMetakom);
                ibutton_key_set_data(worker->key_p, worker->key_data, ibutton_key_get_max_size());
                result = true;
                break;
            default:
                break;
            }
        }
    }

    furi_hal_rfid_comp_stop();
    furi_hal_rfid_comp_set_callback(NULL, NULL);
    furi_hal_rfid_pins_reset();

    furi_stream_buffer_free(read_context.stream);

    return result;
}

bool ibutton_worker_read_dallas(iButtonWorker* worker) {
    bool result = false;
    onewire_host_start(worker->host);
    furi_delay_ms(100);
    FURI_CRITICAL_ENTER();
    if(onewire_host_search(worker->host, worker->key_data, NORMAL_SEARCH)) {
        onewire_host_reset_search(worker->host);

        // key found, verify
        if(onewire_host_reset(worker->host)) {
            onewire_host_write(worker->host, DS1990_CMD_READ_ROM);
            bool key_valid = true;
            for(uint8_t i = 0; i < ibutton_key_get_max_size(); i++) {
                if(onewire_host_read(worker->host) != worker->key_data[i]) {
                    key_valid = false;
                    break;
                }
            }

            if(key_valid) {
                result = true;

                furi_check(worker->key_p != NULL);
                ibutton_key_set_type(worker->key_p, iButtonKeyDS1990);
                ibutton_key_set_data(worker->key_p, worker->key_data, ibutton_key_get_max_size());
            }
        }
    } else {
        onewire_host_reset_search(worker->host);
    }
    onewire_host_stop(worker->host);
    FURI_CRITICAL_EXIT();
    return result;
}

void ibutton_worker_mode_read_start(iButtonWorker* worker) {
    UNUSED(worker);
    furi_hal_power_enable_otg();
}

void ibutton_worker_mode_read_tick(iButtonWorker* worker) {
    bool valid = false;
    if(ibutton_worker_read_dallas(worker)) {
        valid = true;
    } else if(ibutton_worker_read_comparator(worker)) {
        valid = true;
    }

    if(valid) {
        if(worker->read_cb != NULL) {
            worker->read_cb(worker->cb_ctx);
        }

        ibutton_worker_switch_mode(worker, iButtonWorkerIdle);
    }
}

void ibutton_worker_mode_read_stop(iButtonWorker* worker) {
    UNUSED(worker);
    furi_hal_power_disable_otg();
}

/*********************** EMULATE ***********************/
static void onewire_slave_callback(void* context) {
    furi_assert(context);
    iButtonWorker* worker = context;
    ibutton_worker_notify_emulate(worker);
}

void ibutton_worker_emulate_dallas_start(iButtonWorker* worker) {
    uint8_t* device_id = onewire_device_get_id_p(worker->device);
    const uint8_t* key_id = ibutton_key_get_data_p(worker->key_p);
    const uint8_t key_size = ibutton_key_get_max_size();
    memcpy(device_id, key_id, key_size);

    onewire_slave_attach(worker->slave, worker->device);
    onewire_slave_set_result_callback(worker->slave, onewire_slave_callback, worker);
    onewire_slave_start(worker->slave);
}

void ibutton_worker_emulate_dallas_stop(iButtonWorker* worker) {
    onewire_slave_stop(worker->slave);
    onewire_slave_detach(worker->slave);
}

void ibutton_worker_emulate_timer_cb(void* context) {
    furi_assert(context);
    iButtonWorker* worker = context;

    LevelDuration level =
        protocol_dict_encoder_yield(worker->protocols, worker->protocol_to_encode);

    furi_hal_ibutton_emulate_set_next(level_duration_get_duration(level));

    if(level_duration_get_level(level)) {
        furi_hal_ibutton_pin_high();
    } else {
        furi_hal_ibutton_pin_low();
    }
}

void ibutton_worker_emulate_timer_start(iButtonWorker* worker) {
    furi_assert(worker->key_p);
    const uint8_t* key_id = ibutton_key_get_data_p(worker->key_p);
    const uint8_t key_size = ibutton_key_get_max_size();

    switch(ibutton_key_get_type(worker->key_p)) {
    case iButtonKeyDS1990:
        return;
        break;
    case iButtonKeyCyfral:
        worker->protocol_to_encode = iButtonProtocolCyfral;
        break;
    case iButtonKeyMetakom:
        worker->protocol_to_encode = iButtonProtocolMetakom;
        break;
    }

    protocol_dict_set_data(worker->protocols, worker->protocol_to_encode, key_id, key_size);
    protocol_dict_encoder_start(worker->protocols, worker->protocol_to_encode);

    furi_hal_ibutton_start_drive();
    furi_hal_ibutton_emulate_start(0, ibutton_worker_emulate_timer_cb, worker);
}

void ibutton_worker_emulate_timer_stop(iButtonWorker* worker) {
    UNUSED(worker);
    furi_hal_ibutton_emulate_stop();
}

void ibutton_worker_mode_emulate_start(iButtonWorker* worker) {
    furi_assert(worker->key_p);

    furi_hal_rfid_pins_reset();
    furi_hal_rfid_pin_pull_pulldown();

    switch(ibutton_key_get_type(worker->key_p)) {
    case iButtonKeyDS1990:
        ibutton_worker_emulate_dallas_start(worker);
        break;
    case iButtonKeyCyfral:
    case iButtonKeyMetakom:
        ibutton_worker_emulate_timer_start(worker);
        break;
    }
}

void ibutton_worker_mode_emulate_tick(iButtonWorker* worker) {
    UNUSED(worker);
}

void ibutton_worker_mode_emulate_stop(iButtonWorker* worker) {
    furi_assert(worker->key_p);

    furi_hal_rfid_pins_reset();

    switch(ibutton_key_get_type(worker->key_p)) {
    case iButtonKeyDS1990:
        ibutton_worker_emulate_dallas_stop(worker);
        break;
    case iButtonKeyCyfral:
    case iButtonKeyMetakom:
        ibutton_worker_emulate_timer_stop(worker);
        break;
    }
}

/*********************** WRITE ***********************/

void ibutton_worker_mode_write_start(iButtonWorker* worker) {
    furi_hal_power_enable_otg();
    onewire_host_start(worker->host);
}

void ibutton_worker_mode_write_tick(iButtonWorker* worker) {
    furi_check(worker->key_p != NULL);
    iButtonWriterResult writer_result = ibutton_writer_write(worker->writer, worker->key_p);
    iButtonWorkerWriteResult result;
    switch(writer_result) {
    case iButtonWriterOK:
        result = iButtonWorkerWriteOK;
        break;
    case iButtonWriterSameKey:
        result = iButtonWorkerWriteSameKey;
        break;
    case iButtonWriterNoDetect:
        result = iButtonWorkerWriteNoDetect;
        break;
    case iButtonWriterCannotWrite:
        result = iButtonWorkerWriteCannotWrite;
        break;
    default:
        result = iButtonWorkerWriteNoDetect;
        break;
    }

    if(worker->write_cb != NULL) {
        worker->write_cb(worker->cb_ctx, result);
    }
}

void ibutton_worker_mode_write_stop(iButtonWorker* worker) {
    furi_hal_power_disable_otg();
    onewire_host_stop(worker->host);
}