evm DM365 access to EEPROM and Keypad

[Juraj Zopp]

Hi,

I found no documentation for accessing the eeprom on the evmdm365 -
DM365. The device is /dev/mtd5. I would like to post application code
for working with EEPROM:

// ---------------------------------------------
// write params to EEPROM

#define EEPROM_FILE_NAME "/dev/mtd5" // "/opt/http/cam_params.txt"
#define EEPROM_PARAMS_START_ADDR 0x40

Write_Param_EEPROM()
{
  FILE* F=fopen(EEPROM_FILE_NAME,"w");
  if (!F)
  {
    printf("Read_Params_EEPROM - Error opening file\n");
    return -1;
  }
  if (fseek(F,EEPROM_PARAMS_START_ADDR,SEEK_SET))
  {
    printf("Read_Params_EEPROM - Error seeking file\n");
    fclose(F);
    return -1;
  }
  // save all params to the file
  // store parameter self
  fprintf(F,"This string will be stored in eeprom.");
  fclose(F);
}

// ---------------------------------------------

Also working with keypad on evmdm365 can be handled with this code:

// --------------------------------

#define KEY_CODE_STOP 12

static int buttons_fd=0;
#define KEYBOARD_FILE_NAME "/dev/input/event0"

static void HandleButtons()
{
  int rb;
  int i;
  #define MAX_EVENTS 1
  struct input_event ev[MAX_EVENTS];

  if (!buttons_fd)
  {
    printf("SetupApply HandleButtons - Error zero handle " KEYBOARD_FILE_NAME 
"\n");
    return;
  }

  rb = read(buttons_fd, ev, sizeof(ev));

  if (rb<1) return;

  if (rb < (int) sizeof(struct input_event)) {
    printf("HandleButtons: short read\n");
    return;
  }

  for (i = 0;
    i < (int) (rb / sizeof(struct input_event));
    i++)
  {
    if (EV_KEY == ev[i].type)
    {
      printf("HandleButtons i %d time %ld.%06ld ",
        i,
        ev[i].time.tv_sec,
        ev[i].time.tv_usec);
      printf("HandleButtons type %d code %d value %d\n",
        ev[i].type,
        ev[i].code, ev[i].value);
      if (ev[i].value==1)
      {
        switch (ev[i].code)
        {
        case KEY_CODE_STOP:
          printf("Button stop was pressed\n");
          break;
        }
      }
    }
  }
}

// --------------------------------

static void StartButtonsHandler()
{
  buttons_fd = open(KEYBOARD_FILE_NAME, 0); // O_NONBLOCK
  if (buttons_fd)
  {
    printf("SetupApply InitButtons - OK " KEYBOARD_FILE_NAME "\n");
  }
  else
  {
    printf("SetupApply InitButtons - Error opening handle " KEYBOARD_FILE_NAME 
"\n");
    return;
  }
  
  while (1)
  {
    HandleButtons();
    usleep(100);
  }
}

// --------------------------------


Best regards,
Juraj



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