Momentum-Apps/evil_portal_uart.c

#include "evil_portal_app_i.h"
#include "evil_portal_uart.h"
#include "helpers/evil_portal_storage.h"

struct Evil_PortalUart {
  Evil_PortalApp *app;
  FuriThread *rx_thread;
  FuriStreamBuffer *rx_stream;
  uint8_t rx_buf[RX_BUF_SIZE + 1];
  void (*handle_rx_data_cb)(uint8_t *buf, size_t len, void *context);
};

typedef enum {
  WorkerEvtStop = (1 << 0),
  WorkerEvtRxDone = (1 << 1),
} WorkerEvtFlags;

void evil_portal_uart_set_handle_rx_data_cb(
    Evil_PortalUart *uart,
    void (*handle_rx_data_cb)(uint8_t *buf, size_t len, void *context)) {
  furi_assert(uart);
  uart->handle_rx_data_cb = handle_rx_data_cb;
}

#define WORKER_ALL_RX_EVENTS (WorkerEvtStop | WorkerEvtRxDone)

void evil_portal_uart_on_irq_cb(UartIrqEvent ev, uint8_t data, void *context) {
  Evil_PortalUart *uart = (Evil_PortalUart *)context;

  if (ev == UartIrqEventRXNE) {
    furi_stream_buffer_send(uart->rx_stream, &data, 1, 0);
    furi_thread_flags_set(furi_thread_get_id(uart->rx_thread), WorkerEvtRxDone);
  }
}

static int32_t uart_worker(void *context) {
  Evil_PortalUart *uart = (void *)context;

  while (1) {

    uint32_t events = furi_thread_flags_wait(WORKER_ALL_RX_EVENTS,
                                             FuriFlagWaitAny, FuriWaitForever);
    furi_check((events & FuriFlagError) == 0);
    if (events & WorkerEvtStop)
      break;
    if (events & WorkerEvtRxDone) {
      size_t len = furi_stream_buffer_receive(uart->rx_stream, uart->rx_buf,
                                              RX_BUF_SIZE, 0);

      if (len > 0) {
        if (uart->handle_rx_data_cb) {
          uart->handle_rx_data_cb(uart->rx_buf, len, uart->app);

          if (uart->app->has_command_queue) {
            if (uart->app->command_index < 1) {
              if (0 ==
                  strncmp(SET_AP_CMD,
                          uart->app->command_queue[uart->app->command_index],
                          strlen(SET_AP_CMD))) {
                FuriString *out_data = furi_string_alloc();

                furi_string_cat(out_data, "setap=");
                furi_string_cat(out_data, (char *)uart->app->ap_name);

                evil_portal_uart_tx((uint8_t *)(furi_string_get_cstr(out_data)),
                                    strlen(furi_string_get_cstr(out_data)));
                evil_portal_uart_tx((uint8_t *)("\n"), 1);

                uart->app->sent_ap = true;

                free(out_data);
                free(uart->app->ap_name);
              }

              uart->app->command_index = 0;
              uart->app->has_command_queue = false;
              uart->app->command_queue[0] = "";
            }
          }

          if (uart->app->sent_reset == false) {
            furi_string_cat(uart->app->portal_logs, (char *)uart->rx_buf);
          }

          if (furi_string_utf8_length(uart->app->portal_logs) > 4000) {
            write_logs(uart->app->portal_logs);
            furi_string_reset(uart->app->portal_logs);
          }
        } else {          
          uart->rx_buf[len] = '\0';
          if (uart->app->sent_reset == false) {
            furi_string_cat(uart->app->portal_logs, (char *)uart->rx_buf);
          }

          if (furi_string_utf8_length(uart->app->portal_logs) > 4000) {
            write_logs(uart->app->portal_logs);
            furi_string_reset(uart->app->portal_logs);
          }
        }
      } 
    }
  }

  furi_stream_buffer_free(uart->rx_stream);

  return 0;
}

void evil_portal_uart_tx(uint8_t *data, size_t len) {
  furi_hal_uart_tx(UART_CH, data, len);
}

Evil_PortalUart *evil_portal_uart_init(Evil_PortalApp *app) {
  Evil_PortalUart *uart = malloc(sizeof(Evil_PortalUart));
  uart->app = app;
  // Init all rx stream and thread early to avoid crashes
  uart->rx_stream = furi_stream_buffer_alloc(RX_BUF_SIZE, 1);
  uart->rx_thread = furi_thread_alloc();
  furi_thread_set_name(uart->rx_thread, "Evil_PortalUartRxThread");
  furi_thread_set_stack_size(uart->rx_thread, 1024);
  furi_thread_set_context(uart->rx_thread, uart);
  furi_thread_set_callback(uart->rx_thread, uart_worker);

  furi_thread_start(uart->rx_thread);

  furi_hal_console_disable();
  if (app->BAUDRATE == 0) {
    app->BAUDRATE = 115200;
  }
  furi_hal_uart_set_br(UART_CH, app->BAUDRATE);
  furi_hal_uart_set_irq_cb(UART_CH, evil_portal_uart_on_irq_cb, uart);

  return uart;
}

void evil_portal_uart_free(Evil_PortalUart *uart) {
  furi_assert(uart);

  furi_thread_flags_set(furi_thread_get_id(uart->rx_thread), WorkerEvtStop);
  furi_thread_join(uart->rx_thread);
  furi_thread_free(uart->rx_thread);

  furi_hal_uart_set_irq_cb(UART_CH, NULL, NULL);
  furi_hal_console_enable();

  free(uart);
}