seader/uart.c

#include "seader_i.h"
#include <furi_hal_gpio.h>

#define TAG                      "SeaderUART"
#define RESET_PIN                &gpio_ext_pa6
#define PWM_FREQ                 3571200
#define RAW_BAUDRATE_DEFAULT     (PWM_FREQ / 372)
#define SEC1210_BAUDRATE_DEFAULT 115200

// Raw version
static bool hasSAM = false;
static bool ppsSetup = false;

static uint8_t PPS[] = {0xFF, 0x11, 0x96, 0x78};

static void seader_uart_on_irq_rx_dma_cb(
    FuriHalSerialHandle* handle,
    FuriHalSerialRxEvent ev,
    size_t size,
    void* context) {
    SeaderUartBridge* seader_uart = (SeaderUartBridge*)context;
    if(ev & (FuriHalSerialRxEventData | FuriHalSerialRxEventIdle)) {
        uint8_t data[FURI_HAL_SERIAL_DMA_BUFFER_SIZE] = {0};
        while(size) {
            size_t ret = furi_hal_serial_dma_rx(
                handle,
                data,
                (size > FURI_HAL_SERIAL_DMA_BUFFER_SIZE) ? FURI_HAL_SERIAL_DMA_BUFFER_SIZE : size);
            furi_stream_buffer_send(seader_uart->rx_stream, data, ret, 0);
            size -= ret;
        };
        furi_thread_flags_set(furi_thread_get_id(seader_uart->thread), WorkerEvtRxDone);
    }
}

void seader_uart_disable(SeaderUartBridge* seader_uart) {
    furi_assert(seader_uart);
    furi_thread_flags_set(furi_thread_get_id(seader_uart->thread), WorkerEvtStop);
    furi_thread_join(seader_uart->thread);
    furi_thread_free(seader_uart->thread);
    free(seader_uart);
}

void seader_uart_serial_init(Seader* seader, uint8_t uart_ch) {
    SeaderUartBridge* seader_uart = seader->uart;
    furi_assert(!seader_uart->serial_handle);

    seader_uart->serial_handle = furi_hal_serial_control_acquire(uart_ch);
    furi_assert(seader_uart->serial_handle);

    if(seader->worker->sam_comm_type == SeaderSamCommunicationTypeSec1210) {
        furi_hal_serial_init(seader_uart->serial_handle, SEC1210_BAUDRATE_DEFAULT);
        furi_hal_serial_dma_rx_start(
            seader_uart->serial_handle, seader_uart_on_irq_rx_dma_cb, seader_uart, false);
    } else {
        furi_hal_serial_init(seader_uart->serial_handle, RAW_BAUDRATE_DEFAULT);

        furi_hal_serial_dma_rx_start(
            seader_uart->serial_handle, seader_uart_on_irq_rx_dma_cb, seader_uart, false);

        furi_hal_pwm_start(FuriHalPwmOutputIdTim1PA7, PWM_FREQ, 50);

        furi_hal_gpio_init(RESET_PIN, GpioModeOutputPushPull, GpioPullNo, GpioSpeedLow);
        furi_hal_gpio_write(RESET_PIN, true); // Active low, so set high
    }
}

void seader_uart_sam_reset(Seader* seader) {
    if(seader->worker->sam_comm_type == SeaderSamCommunicationTypeRaw) {
        hasSAM = false;
        seader_uart_set_baudrate(seader->uart, RAW_BAUDRATE_DEFAULT);
        furi_hal_gpio_write(RESET_PIN, false);
        furi_delay_ms(1);
        furi_hal_gpio_write(RESET_PIN, true);
    }
}

void seader_uart_serial_deinit(Seader* seader) {
    SeaderUartBridge* seader_uart = seader->uart;
    furi_assert(seader_uart->serial_handle);
    furi_hal_serial_deinit(seader_uart->serial_handle);
    furi_hal_serial_control_release(seader_uart->serial_handle);
    seader_uart->serial_handle = NULL;

    if(seader->worker->sam_comm_type == SeaderSamCommunicationTypeRaw) {
        furi_hal_pwm_stop(FuriHalPwmOutputIdTim1PA7);

        furi_hal_gpio_init_simple(RESET_PIN, GpioModeAnalog);
        furi_hal_gpio_write(RESET_PIN, false);
    }
}

void seader_uart_set_baudrate(SeaderUartBridge* seader_uart, uint32_t baudrate) {
    if(baudrate != 0) {
        furi_hal_serial_set_br(seader_uart->serial_handle, baudrate);
    } else {
        FURI_LOG_I(TAG, "No baudrate specified");
    }
}

size_t seader_uart_process_buffer_sec1210(Seader* seader, uint8_t* cmd, size_t cmd_len) {
    if(cmd_len < 2) {
        return cmd_len;
    }

    size_t consumed = 0;
    do {
        consumed = seader_ccid_process(seader, cmd, cmd_len);

        if(consumed > 0) {
            memset(cmd, 0, consumed);
            cmd_len -= consumed;
            if(cmd_len > 0) {
                memmove(cmd, cmd + consumed, cmd_len);
            }

            char display[SEADER_UART_RX_BUF_SIZE * 2 + 1] = {0};
            memset(display, 0, SEADER_UART_RX_BUF_SIZE);
            for(uint8_t i = 0; i < cmd_len; i++) {
                snprintf(display + (i * 2), sizeof(display), "%02x", cmd[i]);
            }
            FURI_LOG_I(TAG, "cmd is now %d bytes: %s", cmd_len, display);
        }
    } while(consumed > 0 && cmd_len > 0);
    return cmd_len;
}

size_t seader_uart_process_buffer_raw(Seader* seader, uint8_t* cmd, size_t cmd_len) {
    SeaderUartBridge* seader_uart = seader->uart;
    char display[SEADER_UART_RX_BUF_SIZE * 2 + 1] = {0};
    memset(display, 0, SEADER_UART_RX_BUF_SIZE);
    for(uint8_t i = 0; i < cmd_len; i++) {
        snprintf(display + (i * 2), sizeof(display), "%02x", cmd[i]);
    }
    FURI_LOG_I(TAG, "seader_uart_process_buffer_raw %d bytes: %s", cmd_len, display);

    if(ppsSetup) {
        if(memcmp(PPS, cmd, sizeof(PPS)) == 0) {
            FURI_LOG_I(TAG, "PPS received, setting baudrate to 230400");
            // On paper (based on PPS) the baudrate should be 223125, but in practice 230400 works fine
            seader_uart_set_baudrate(seader->uart, 230400);

            //seader_t_1_set_IFSD(seader);

            // Kick off next part of detection process
            seader_worker_send_version(seader);
            SeaderWorker* seader_worker = seader->worker;
            if(seader_worker->callback) {
                seader_worker->callback(SeaderWorkerEventSamPresent, seader_worker->context);
            }

            return 0;
        }
    }

    if(hasSAM) {
        CCID_Message message;
        message.payload = cmd;
        message.dwLength = cmd_len;
        if(seader_recv_t1(seader, &message)) {
            return 0;
        } else {
            return cmd_len;
        }
    }

    if(cmd_len < sizeof(SAM_ATR)) {
        return cmd_len;
    }

    do {
        if(memcmp(SAM_ATR, cmd, sizeof(SAM_ATR)) == 0) {
            FURI_LOG_I(TAG, "SAM ATR!");
            hasSAM = true;

            // In order to get the transmission to work, we fudge the baudrate here
            seader_uart_set_baudrate(seader_uart, 9900);

            furi_hal_serial_configure_framing(
                seader_uart->serial_handle,
                FuriHalSerialDataBits8,
                FuriHalSerialParityEven,
                FuriHalSerialStopBits2);

            // 5.2.3 PPS - Protocol Parameter Selection
            // 0xFF, 0x11, 0x96, 0x78
            seader_uart_send(seader_uart, PPS, sizeof(PPS));
            ppsSetup = true;

            return 0;
        }

        cmd++;
        cmd_len--;
    } while(cmd_len > 0);

    return cmd_len;
}

size_t seader_uart_process_buffer(Seader* seader, uint8_t* cmd, size_t cmd_len) {
    if(seader->worker->sam_comm_type == SeaderSamCommunicationTypeSec1210) {
        return seader_uart_process_buffer_sec1210(seader, cmd, cmd_len);
    } else {
        return seader_uart_process_buffer_raw(seader, cmd, cmd_len);
    }
}

int32_t seader_uart_worker(void* context) {
    Seader* seader = (Seader*)context;
    SeaderUartBridge* seader_uart = seader->uart;
    furi_thread_set_current_priority(FuriThreadPriorityHighest);

    memcpy(&seader_uart->cfg, &seader_uart->cfg_new, sizeof(SeaderUartConfig));

    seader_uart->rx_stream = furi_stream_buffer_alloc(SEADER_UART_RX_BUF_SIZE, 1);

    seader_uart->tx_sem = furi_semaphore_alloc(1, 1);

    seader_uart->tx_thread =
        furi_thread_alloc_ex("SeaderUartTxWorker", 1.5 * 1024, seader_uart_tx_thread, seader);

    seader_uart_serial_init(seader, seader_uart->cfg.uart_ch);
    // NOTE: I question the value of this
    seader_uart_set_baudrate(seader_uart, seader_uart->cfg.baudrate);

    furi_thread_flags_set(furi_thread_get_id(seader_uart->tx_thread), WorkerEvtSamRx);

    furi_thread_start(seader_uart->tx_thread);

    uint8_t cmd[SEADER_UART_RX_BUF_SIZE];
    size_t cmd_len = 0;

    while(1) {
        uint32_t events =
            furi_thread_flags_wait(WORKER_ALL_RX_EVENTS, FuriFlagWaitAny, FuriWaitForever);
        furi_check(!(events & FuriFlagError));
        if(events & WorkerEvtStop) {
            memset(cmd, 0, cmd_len);
            cmd_len = 0;
            break;
        }
        if(events & (WorkerEvtRxDone | WorkerEvtSamTxComplete)) {
            size_t len = furi_stream_buffer_receive(
                seader_uart->rx_stream, seader_uart->rx_buf, SEADER_UART_RX_BUF_SIZE, 0);
            if(len > 0) {
                furi_delay_ms(5); //WTF
                if(memcmp(seader_uart->rx_buf, seader_uart->tx_buf, len) == 0) {
                    FURI_LOG_I(TAG, "Ignoring echoed data");
                    continue;
                }

                char display[SEADER_UART_RX_BUF_SIZE * 2 + 1] = {0};
                for(uint8_t i = 0; i < len; i++) {
                    snprintf(display + (i * 2), sizeof(display), "%02x", seader_uart->rx_buf[i]);
                }
                FURI_LOG_I(TAG, "RECV %d bytes: %s", len, display);

                if(cmd_len + len > SEADER_UART_RX_BUF_SIZE) {
                    FURI_LOG_I(TAG, "OVERFLOW: %d + %d", cmd_len, len);
                    memset(cmd, 0, cmd_len);
                    cmd_len = 0;
                }

                memcpy(cmd + cmd_len, seader_uart->rx_buf, len);
                cmd_len += len;
                cmd_len = seader_uart_process_buffer(seader, cmd, cmd_len);
            }
        }
    }
    seader_uart_serial_deinit(seader);

    furi_thread_flags_set(furi_thread_get_id(seader_uart->tx_thread), WorkerEvtTxStop);
    furi_thread_join(seader_uart->tx_thread);
    furi_thread_free(seader_uart->tx_thread);

    furi_stream_buffer_free(seader_uart->rx_stream);
    furi_semaphore_free(seader_uart->tx_sem);
    return 0;
}

SeaderUartBridge* seader_uart_enable(SeaderUartConfig* cfg, Seader* seader) {
    SeaderUartBridge* seader_uart = malloc(sizeof(SeaderUartBridge));

    seader_uart->T = 1;

    memcpy(&(seader_uart->cfg_new), cfg, sizeof(SeaderUartConfig));

    seader_uart->thread =
        furi_thread_alloc_ex("SeaderUartWorker", 5 * 1024, seader_uart_worker, seader);

    furi_thread_start(seader_uart->thread);
    return seader_uart;
}

void seader_uart_send(SeaderUartBridge* seader_uart, uint8_t* data, size_t len) {
    memcpy(seader_uart->tx_buf, data, len);
    seader_uart->tx_len = len;
    furi_thread_flags_set(furi_thread_get_id(seader_uart->tx_thread), WorkerEvtSamRx);
}

int32_t seader_uart_tx_thread(void* context) {
    Seader* seader = (Seader*)context;
    SeaderUartBridge* seader_uart = seader->uart;

    furi_thread_set_current_priority(FuriThreadPriorityHighest);
    while(1) {
        uint32_t events =
            furi_thread_flags_wait(WORKER_ALL_TX_EVENTS, FuriFlagWaitAny, FuriWaitForever);
        furi_check(!(events & FuriFlagError));
        if(events & WorkerEvtTxStop) break;
        if(events & WorkerEvtSamRx) {
            if(seader_uart->tx_len > 0) {
                char display[SEADER_UART_RX_BUF_SIZE * 2 + 1] = {0};
                for(uint8_t i = 0; i < seader_uart->tx_len; i++) {
                    snprintf(display + (i * 2), sizeof(display), "%02x", seader_uart->tx_buf[i]);
                }
                // FURI_LOG_I(TAG, "SEND %d bytes: %s", seader_uart->tx_len, display);
                furi_hal_serial_tx(
                    seader_uart->serial_handle, seader_uart->tx_buf, seader_uart->tx_len);
            }
        }
    }
    return 0;
}

void seader_uart_get_config(SeaderUartBridge* seader_uart, SeaderUartConfig* cfg) {
    furi_assert(seader_uart);
    furi_assert(cfg);
    memcpy(cfg, &(seader_uart->cfg_new), sizeof(SeaderUartConfig));
}

void seader_uart_get_state(SeaderUartBridge* seader_uart, SeaderUartState* st) {
    furi_assert(seader_uart);
    furi_assert(st);
    memcpy(st, &(seader_uart->st), sizeof(SeaderUartState));
}

SeaderUartBridge* seader_uart_alloc(Seader* seader) {
    uint32_t baudrate;
    if(seader->worker->sam_comm_type == SeaderSamCommunicationTypeSec1210) {
        baudrate = SEC1210_BAUDRATE_DEFAULT;
    } else {
        baudrate = RAW_BAUDRATE_DEFAULT;
    }

    SeaderUartConfig cfg = {.uart_ch = FuriHalSerialIdLpuart, .baudrate = baudrate};
    SeaderUartState uart_state;
    SeaderUartBridge* seader_uart;

    FURI_LOG_I(TAG, "Enable UART %ld baud", baudrate);
    seader_uart = seader_uart_enable(&cfg, seader);

    seader_uart_get_config(seader_uart, &cfg);
    seader_uart_get_state(seader_uart, &uart_state);
    return seader_uart;
}

void seader_uart_free(SeaderUartBridge* seader_uart) {
    seader_uart_disable(seader_uart);
}