Monthly Archives: February 2026

Bandmaster V info widget

Wrote the following info widget for Bandmaster V (Linux):

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <qt6/libqt6c.h>

// Define the antenna names
#define ANTENNA1 "6m beam"
#define ANTENNA2 "WARC beam"
#define ANTENNA3 "Stack"
#define ANTENNA4 "40m beam"
#define ANTENNA5 "No antenna"
#define ANTENNA6 "No antenna"
#define ANTENNA7 "No antenna"
#define ANTENNA8 "No antenna"
#define ANTENNA9 "No antenna"
#define ANTENNA10 "No antenna"
#define ANTENNA11 "No antenna"
#define ANTENNA12 "No antenna"

#define DEVICE "/dev/serial/by-id/usb-FTDI_FT232R_USB_UART_B003ISA1-if00-port0"

int fd;
void *widget, *label;

int read_untilcr(int fd, char *buf, int maxlen) {

  int pos = 0, bytes_rd;

  while(1) {
    if((bytes_rd = read(fd, buf + pos, 1)) < 0) return -1;
    if(bytes_rd == 0) {
      sleep(1); // could be less than 1sec
      continue;
    }
    if(!pos && (*buf == '\r' || *buf == '\n')) continue;
    if(pos == maxlen) return -1;
    if(buf[pos] == '\r') break;
    pos++;
  }
  buf[pos] = '\0';
  return pos;
}

void set_tty() {

  struct termios param;

  if(tcgetattr(fd, &param) < 0) {
    fprintf(stderr, "Status get failed.\n");
    exit(1);
  }

  param.c_cflag &= ~PARENB;
  param.c_cflag &= ~CSTOPB;
  param.c_cflag |= CS8;
  param.c_cflag &= ~CRTSCTS;
  param.c_cflag |= CREAD | CLOCAL;
  param.c_lflag &= ~ICANON;
  param.c_lflag &= ~ECHO;
  param.c_lflag &= ~ECHOE;
  param.c_lflag &= ~ECHONL;
  param.c_lflag &= ~ISIG;
  param.c_iflag &= ~(IXON | IXOFF | IXANY);
  param.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL);  
  param.c_oflag &= ~OPOST;
  param.c_oflag &= ~ONLCR;
  cfsetispeed(&param, B57600);
  cfsetospeed(&param, B57600);

  if(tcsetattr(fd, TCSANOW, &param) < 0) {
    fprintf(stderr, "Status set failed.\n");
    exit(1);
  }
}

char *txt_noant = "<b><font color='red'>No antenna.</font></b>",
     *txt_40m = "<b><font color='blue'>40m beam.</font></b>",
     *txt_warc = "<b><font color='blue'>WARC beam.</font></b>",
     *txt_stack = "<b><font color='blue'>Stack.</font></b>",
     *txt_6m = "<b><font color='blue'>6m beam.</font></b>";

void update_band_info(void *asd) {

  int len, antenna, relay;
  char buf[512];
  
  if((len = read_untilcr(fd, buf, sizeof(buf))) < 0) {
     fprintf(stderr, "Read error.\n");
     exit(1);
  }
  if(sscanf(buf, "[TC4RFA29H00M0%1d01EEEEEEEEEEEE%4d]", &antenna, &relay) != 2) return; // Some other mesg

  switch(antenna) {
    case 1:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA1, relay);
      q_label_set_text(label, buf);
      break;
    case 2:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA2, relay);
      q_label_set_text(label, buf);
      break;
    case 3:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA3, relay);
      q_label_set_text(label, buf);
      break;
    case 4:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA4, relay);
      q_label_set_text(label, buf);
      break;
    case 5:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA5, relay);
      q_label_set_text(label, buf);
      break;
    case 6:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA6, relay);
      q_label_set_text(label, buf);
      break;
    case 7:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA7, relay);
      q_label_set_text(label, buf);
      break;
    case 8:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA8, relay);
      q_label_set_text(label, buf);
      break;
    case 9:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA9, relay);
      q_label_set_text(label, buf);
      break;
    case 10:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA10, relay);
      q_label_set_text(label, buf);
      break;
    case 11:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA11, relay);
      q_label_set_text(label, buf);
      break;
    case 12:
      sprintf(buf, "<b><font color='blue'>%s (%d)</font></b>", ANTENNA12, relay);
      q_label_set_text(label, buf);
      break;
    default:
      q_label_set_text(label, "<b><font color='red'>Unknown antennan.</font></b>");
  }
}

int main(int argc, char *argv[]) {

  QApplication *app;
  QTimer *timer;  

  if((fd = open(DEVICE, O_RDONLY)) < 0) {
    fprintf(stderr, "Can't open device.\n");
    exit(1);
  }
  set_tty();

  app = q_application_new(&argc, argv);
  widget = q_widget_new2();
  timer = q_timer_new2(widget);
  q_widget_set_window_title(widget, "Antenna selection");
  q_widget_resize(widget, 150, 30);
  label = q_label_new5("------------------------------", widget);
  q_label_set_alignment(label, QT_ALIGNMENTFLAG_ALIGNCENTER);
  q_label_set_text_format(label, QT_TEXTFORMAT_RICHTEXT);
  q_timer_start(timer, 100);
  q_timer_on_timeout(timer, update_band_info);
  q_widget_show(widget);
  (void) q_application_exec();
  q_widget_delete(widget);
  q_application_delete(app);

  close(fd);
}

Uses libqt6c (QT bindings for C).