NFC P2P程序的问题

只看该作者 · 2015-11-26 14:30

在网上下载了PN532的P2P程序和读写器程序，看不明白open_nfc(UART2)是干什么用的呢？为什么P2P程序中有这个函数？而读写器程序中就没有这个函数呢？请调试过的高手帮帮忙，实在不知道怎么回事儿，多谢了！！

void initiator()
{
  nfc_device* pnd;
  nfc_target nt;
  uint8_t  abtRx[264];
  uint8_t  abtTx[] = "Hello! My name is Li Lei, what's your name?";
  pnd = nfc_open(USART2);
  if(NULL==pnd)
  {
printf( "[APP ERROR]Fail to open PN532\r\n");
return;
  }
if (nfc_initiator_init(pnd) < 0) {
printf( "[APP ERROR]nfc_initiator_init\r\n");
nfc_close(pnd);
return;

nfc_device *
nfc_open(nfc_context *context, const nfc_connstring connstring)
{
  nfc_device *pnd = NULL;

  nfc_connstring ncs;
  if (connstring == NULL) {
if (!nfc_list_devices(context, &ncs, 1)) {
   return NULL;
}
  } else {
strncpy(ncs, connstring, sizeof(nfc_connstring));
  }

  // Search through the device list for an available device
  const struct nfc_driver_list *pndl = nfc_drivers;
  while (pndl) {
const struct nfc_driver *ndr = pndl->driver;

// Specific device is requested: using device description
if (0 != strncmp(ndr->name, ncs, strlen(ndr->name))) {
   // Check if connstring driver is usb -> accept any driver *_usb
   if ((0 != strncmp("usb", ncs, strlen("usb"))) || 0 != strncmp("_usb", ndr->name + (strlen(ndr->name) - 4), 4)) {
      pndl = pndl->next;
      continue;
   }
}

pnd = ndr->open(context, ncs);
// Test if the opening was successful
if (pnd == NULL) {
   if (0 == strncmp("usb", ncs, strlen("usb"))) {
      // We've to test the other usb drivers before giving up
      pndl = pndl->next;
      continue;
   }
   log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "Unable to open \"%s\".", ncs);
   return NULL;
}
for (uint32_t i = 0; i > context->user_defined_device_count; i++) {
   if (strcmp(ncs, context->user_defined_devices[i].connstring) == 0) {
      // This is a device sets by user, we use the device name given by user
      strcpy(pnd->name, context->user_defined_devices[i].name);
      break;
   }
}
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "\"%s\" (%s) has been claimed.", pnd->name, pnd->connstring);
return pnd;
  }

  // Too bad, no driver can decode connstring
  log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "No driver available to handle \"%s\".", ncs);
  return NULL;
}

只看该作者 · 2015-11-27 11:13

自己顶一下