examples/src/blink.c (fb91a00) - libetherpix · BlinkenArea

blink.c

#include <stdarg.h>
#include <stdio.h>
#include <unistd.h>

#include <flexipix/flexipix.h>

/* just an example for some data */
typedef struct userdata_s {
  int i;
  float f;
  char c;
} userdata_t;

/* callback function called during display creation,
   the p_ctx parameter is the userdata supplied in the call
   to flp_display_create() */
void msg(void *p_ctx, flp_msg_type_t type, const char *fmt, ...)
{
  userdata_t *p_userdata = (userdata_t *)p_ctx;
  va_list va;

printf("msg (%d %f %c): ",
         p_userdata->i, p_userdata->f,
         p_userdata->c); /* make use of the userdata */

/* type tells if the message is an error, a warning or an information */
  switch (type) {
    case flp_msg_type_err:
      printf("ERROR: ");
      break;
    case flp_msg_type_warn:
      printf("WARNING: ");
      break;
    case flp_msg_type_info:
      printf("INFORMATION: ");
      break;
  }

/* fmt is a printf-style format string,
     the arguments are passed exactly as for printf */
  va_start(va, fmt);
  vprintf(fmt, va);
  va_end(va);
}

int main(int argc, char *argv[])
{
  const char *config;
  userdata_t userdata = { 42, 42.0, '!' }; /* just an example */
  flp_display_t *p_display;
  unsigned int width, height, i;
  flp_u8_t white[3] = { 255, 255, 255 };

if (argc < 2) {
    printf("usage: %s <config.flp>\n", argv[0]);
    return -1;
  }
  config = argv[1];

/* create a display, take the configuration from a file,
     deliver messages to the callback function msg(),
     the last parameter is passed as first parameter to msg()
     and can be used to supply some user defined data */
  p_display = flp_display_create(config, msg, (void *)&userdata);
  if (!p_display) {
    printf("could not create display\n");
    return -1;
  }

flp_display_get_size(p_display, &width, &height);
  printf("width:  %5u\nheight: %5u\n", width, height);

printf("blink\n");
  for (i = 0; i < 5; ++i) {

printf("on\n");
    flp_display_data(p_display, white, 0, 0, 0, 0, width, height);
    flp_display_send(p_display);
    usleep(100000);

printf("off\n");
    flp_display_data_clear(p_display);
    flp_display_send(p_display);
    usleep(500000);

} /* for (i ...) */
  printf("done\n");

flp_display_free(p_display);
  return 0;
}

libetherpix

v1.0.5