我使用的是带有low power blue tooth和PN532 RFID/NFC Shield的Arduino UNO。
我遇到一个问题，即我的草图中的循环没有循环，除非检测到至少一张卡，并通过修改RFID盾牌readPassiveTargetID()函数的库来修复它是非阻塞的 （将while循环更改为if语句，因此它没有被卡住）。
现在的问题是它似乎无法读取任何标签的标签ID，除非有两个标签。
我的草图
#include <SPI.h>
#include "Adafruit_BLE_UART.h"
#include <Wire.h>
#include <Adafruit_NFCShield_I2C.h>
#define IRQ (7)
#define IRQ2 (4)
#define RESET (3) // Not connected by default on the NFC Shield
Adafruit_NFCShield_I2C nfc(IRQ, RESET);
//Adafruit_NFCShield_I2C nfc2(IRQ2, RESET);
// Connect CLK/MISO/MOSI to hardware SPI
// e.g. On UNO & compatible: CLK = 13, MISO = 12, MOSI = 11
#define ADAFRUITBLE_REQ 10
#define ADAFRUITBLE_RDY 3 // This should be an interrupt pin, on Uno thats #2 or #3
#define ADAFRUITBLE_RST 9
Adafruit_BLE_UART BTLEserial = Adafruit_BLE_UART(ADAFRUITBLE_REQ, ADAFRUITBLE_RDY, ADAFRUITBLE_RST);
uint8_t numChecks = 0;
String items[]= {"","","","","","","",""};
String lastList="";
/**************************************************************************/
/*!
Configure the Arduino and start advertising with the radio
*/
/**************************************************************************/
void setup(void)
{
Serial.begin(115200);
//while(!Serial);
startNFC();
BTLEserial.begin();
//startNFC();
//while(!Serial); // Leonardo/Micro should wait for serial init
}
/**************************************************************************/
/*!
Constantly checks for new events on the nRF8001
*/
/**************************************************************************/
aci_evt_opcode_t laststatus = ACI_EVT_DISCONNECTED;
void loop()
{
//Serial.println("--------------------Loop begin-------------------");
// Tell the nRF8001 to do whatever it should be working on.
BTLEserial.pollACI();
// Ask what is our current status
aci_evt_opcode_t status = BTLEserial.getState();
// If the status changed....
if (status != laststatus) {
// print it out!
if (status == ACI_EVT_DEVICE_STARTED) {
Serial.println(F("* Advertising started"));
}
if (status == ACI_EVT_CONNECTED) {
Serial.println(F("* Connected!"));
BTLEserial.print("Goodmorning");
}
if (status == ACI_EVT_DISCONNECTED) {
Serial.println(F("* Disconnected or advertising timed out"));
}
// OK set the last status change to this one
laststatus = status;
}
if(status == ACI_EVT_CONNECTED){
if(numChecks<7){
numChecks++;
}
else{
updatePhone();
numChecks =0;
}
uint8_t success;
uint8_t uid[] = {0, 0, 0, 0, 0, 0, 0}; // Buffer to store the returned UID
uint8_t uidLength; // Length of the UID (4 or 7 bytes depending on ISO14443A card type)
Serial.println("CHECK #");Serial.print(numChecks,DEC);
// Wait for an ISO14443A type cards (Mifare, etc.). When one is found
// 'uid' will be populated with the UID, and uidLength will indicate
// if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)
success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength);
items[numChecks] ="";
Serial.println("----------SCANNING------");
if (success) {
Serial.println("Found one!");
// Display some basic information about the card
// Serial.println("Found an ISO14443A card");
// Serial.print(" UID Length: ");Serial.print(uidLength, DEC);Serial.println(" bytes");
// Serial.print(" UID Value: ");
String uidChar ="";
for ( int i = 0; i < 7; i++ ) {
uidChar += "x";
uidChar += uid[i];
}
Serial.println("ID:"+uidChar);
//Serial.println(uidChar);
if(!itemAlreadyExists(uidChar)){
Serial.println("Its New");
items[numChecks] = uidChar;
}
}
else{
Serial.println("No Card found");
}
}
}
// Serial.println("************************Loop END*********************");
boolean itemAlreadyExists(String id){
boolean result = false;
for(int i=0; i<7; i++){
String s = items[i];
if(id.equals(s)){
result = true;
}
}
return result;
}
void startNFC(){
nfc.begin();
uint32_t versiondata = nfc.getFirmwareVersion();
if (! versiondata) {
Serial.print("Didn't find PN53x board");
//while (1); // halt
}
else{
Serial.print("FOUND PN53x board");
}
nfc.SAMConfig();
}
void updatePhone(){
String itemsList ="";
for(int i = 0; i<8;i++){
String s = items[i];
Serial.println("handling::"+s);
if(!s.equals("")){
Serial.println("NOT EMPTY");
if(itemsList.length()>0){
itemsList +=",";
};
itemsList += s;
}
else{
Serial.println("STRING EMPTY");
}
}
if(itemsList.length()>0){
Serial.println(itemsList);
}
else{
Serial.println("EMPTY");
}
numChecks = 0;
items[0]="";
items[1]="";
items[2]="";
items[3]="";
items[4]="";
items[5]="";
items[6]="";
items[7]="";
delay(5000);
}
我的串行输出没有卡片：
FOUND PN53x board* Advertising started
* Connected!
Writing out to BTLE: 0x47 0x6F 0x6F 0x64 0x6D 0x6F 0x72 0x6E 0x69 0x6E 0x67
CHECK #
1----------SCANNING------
No Card found
CHECK #
2----------SCANNING------
No Card found
CHECK #
3----------SCANNING------
No Card found
CHECK #
4----------SCANNING------
No Card found
CHECK #
5----------SCANNING------
No Card found
CHECK #
6----------SCANNING------
No Card found
CHECK #
7----------SCANNING------
No Card found
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
EMPTY
使用一张卡
CHECK #
0----------SCANNING------
No Card found
CHECK #
1----------SCANNING------
No Card found
CHECK #
2----------SCANNING------
No Card found
CHECK #
3----------SCANNING------
No Card found
CHECK #
4----------SCANNING------
No Card found
CHECK #
5----------SCANNING------
No Card found
CHECK #
6----------SCANNING------
No Card found
CHECK #
7----------SCANNING------
No Card found
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
EMPTY
使用两张卡
CHECK #
2----------SCANNING------
Found one!
ID:x19x153x28x212x0x0x0
Its New
CHECK #
3----------SCANNING------
Found one!
ID:x19x52x39x212x0x0x0
Its New
CHECK #
4----------SCANNING------
Found one!
ID:x19x153x28x212x0x0x0
CHECK #
5----------SCANNING------
Found one!
ID:x19x52x39x212x0x0x0
CHECK #
6----------SCANNING------
Found one!
ID:x19x153x28x212x0x0x0
CHECK #
7----------SCANNING------
Found one!
ID:x19x52x39x212x0x0x0
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::x19x153x28x212x0x0x0
NOT EMPTY
handling::x19x52x39x212x0x0x0
NOT EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
handling::
STRING EMPTY
x19x153x28x212x0x0x0,x19x52x39x212x0x0x0
如果我把两张牌留在那里，他们最终会离开？
任何想法都错了吗？
答案 0 :(得分：1)
我使用Seeed-Studio PN532 drivers和我的Adafruit NFC盾牌。
Seeed-Studio版本不会阻止，您可以选择设置超时。
我的NDEF library具有更高级别的Tag对象抽象，您可能会发现它对于阅读NFC标签非常有用。 Simple example。 Extended Example。
if (nfc.tagPresent()){
NfcTag tag = nfc.read();
Serial.println(tag.getTagType());
Serial.print("UID: ");Serial.println(tag.getUidString());
}