PN532 - 在同一草图中与 Mifare 标签和 NFC phone 通信
PN532 - Communicate with Mifare tag and NFC phone in the same sketch
我正在尝试在同一草图中使用带有 mifare 标签的 PN532 和 android 应用程序。但问题似乎是 android phone 被 mifare 模块和 NFC 模块检测到。因此,在大约一半的情况下,它会尝试与 phone 进行通信,就好像它是一个 mifare 标签一样。仅此一项不会有问题,但在所有这些之后不再检测到 phone。
作为一个小型演示,如果我多次放置标签并在一段时间后将其移除,我会得到如下输出:
[5150] Mifare Placed
[7301] Mifare Removed
[10545] Mifare Placed
[11626] Mifare Removed
但是如果我放置和移除我的 phone,输出如下所示:
[1821] Mobile Placed
[2951] Mobile Removed
[3615] Mifare Placed
[3692] Mifare Removed
如您所见,我第二次尝试让它与 phone 通信时,mifare 模块识别它并显示错误消息。
这是我的代码:
#include <Adafruit_PN532.h>
#define PN532_IRQ (2)
#define PN532_RESET (3)
Adafruit_PN532 nfc(PN532_IRQ, PN532_RESET);
static uint8_t lastType = 255;
#include "mifareclassic.h"
MifareClassic* mifare;
#include "nfc.h"
NFC* mobile;
void setup() {
Serial.begin(115200);
nfc.begin();
uint32_t versiondata;
versiondata = nfc.getFirmwareVersion();
if (! versiondata) {
Serial.println("Error!");
}
nfc.setPassiveActivationRetries(3); //else, it will endlessly try to retrieve the tag
nfc.SAMConfig(); //read tags
}
void loop() {
if(lastType==255){
//MIFARE PLACED?
if(mifare->isPlaced()){
lastType = 0;
Serial.println("["+String(millis())+"] Mifare Placed");
}
//NFC PLACED?
else if(mobile->isPlaced()){
lastType = 1;
Serial.println("["+String(millis())+"] Mobile Placed");
}
} else {
//MIFARE REMOVED?
if(lastType==0){
if(!mifare->isPlaced()){
Serial.println("["+String(millis())+"] Mifare Removed");
lastType = 255;
}
}
//NFC REMOVED?
else if(lastType==1){
if(!mobile->isPlaced()){
Serial.println("["+String(millis())+"] Mobile Removed");
lastType = 255;
}
}
}
}
main.ino
#define block 4
class MifareClassic {
public:
MifareClassic(){}
bool isPlaced();
};
bool MifareClassic::isPlaced(){
uint8_t len;
uint8_t uid[8] = {0};
if(nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &len)){
return true;
} else {
return false;
}
}
mifareclassic.h
#define block 4
class NFC {
public:
NFC(){}
bool isPlaced();
};
bool NFC::isPlaced(){
if(lastType == 255){
if(nfc.inListPassiveTarget()) {
//nfc.inListPassiveTarget();
//authentificate via AID
uint8_t selectApdu[] = { 0x00, /* CLA */
0xA4, /* INS */
0x04, /* P1 */
0x00, /* P2 */
0x07, /* Length of AID */
0xF0, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, /* AID defined on Android App */
0x00 /* Le */ };
uint8_t uid[8];
uint8_t len;
if(nfc.inDataExchange(selectApdu, sizeof(selectApdu), uid, &len)) {
return true;
}
}
} else {
uint8_t apdu[] = {0};
uint8_t back[32];
uint8_t len;
if(nfc.inDataExchange(apdu, sizeof(apdu), back, &len)) {
return true;
}
}
return false;
}
nfc.h
经过大量实验后,我找到了一个解决方案:我只是使用 inListPassiveTarget()
函数来查明是否放置了任何东西。如果是这种情况,我会通过 inDataExchange()
验证 AID 来检查放置的手机 phone,如果不起作用,则只通过 readPassiveTargetID()
检查 mifareclassic。
以防将来有人遇到同样的问题,这是我的(现在可以使用的)代码:
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_PN532.h>
#define PN532_IRQ (2)
#define PN532_RESET (3)
Adafruit_PN532 nfc(PN532_IRQ, PN532_RESET);
enum { NONE, MIFARECLASSIC, MOBILE };
int lastType = NONE;
#include "mifareclassic.h"
#include "mobile.h"
void setup() {
Serial.begin(115200);
nfc.begin();
uint32_t versiondata;
versiondata = nfc.getFirmwareVersion();
if (! versiondata) {
Serial.println("Error!");
}
nfc.setPassiveActivationRetries(3); //else, it will endlessly try to retrieve the tag
nfc.SAMConfig(); //read tags
}
void loop() {
if(lastType==NONE){
if(nfc.inListPassiveTarget()){
//MOBILE PLACED?
if(Mobile::isNewTagPut()){
lastType = MOBILE;
Serial.println("["+String(millis())+"] Mobile Placed");
}
//MIFARECLASSIC PLACED?
else if(MifareClassic::isNewTagPut()){
lastType = MIFARECLASSIC;
Serial.println("["+String(millis())+"] Mifare Placed");
}
}
} else {
//MOBILE REMOVED?
if(lastType==MOBILE){
if(!Mobile::isTagStillPlaced()){
Serial.println("["+String(millis())+"] Mobile Removed");
lastType = NONE;
}
}
//MIFARECLASSIC REMOVED?
else if(lastType==MIFARECLASSIC){
if(!MifareClassic::isTagStillPlaced()){
Serial.println("["+String(millis())+"] Mifare Removed");
lastType = NONE;
}
}
}
}
main.ino
#define block 4
class MifareClassic {
public:
static bool isNewTagPut();
static bool isTagStillPlaced();
};
bool MifareClassic::isNewTagPut(){
return isTagStillPlaced();
}
bool MifareClassic::isTagStillPlaced(){
uint8_t len;
uint8_t uid[8] = {0};
return nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &len);
}
mifareclassic.h
class Mobile {
public:
static bool isNewTagPut();
static bool isTagStillPlaced();
};
bool Mobile::isNewTagPut(){
//authentificate via AID
uint8_t selectApdu[] = { 0x00, /* CLA */
0xA4, /* INS */
0x04, /* P1 */
0x00, /* P2 */
0x07, /* Length of AID */
0xF0, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, /* AID defined on Android App */
0x00 /* Le */ };
uint8_t uid[8];
uint8_t len;
return nfc.inDataExchange(selectApdu, sizeof(selectApdu), uid, &len);
}
bool Mobile::isTagStillPlaced(){
uint8_t apdu[] = {0};
uint8_t back[32];
uint8_t len;
return nfc.inDataExchange(apdu, sizeof(apdu), back, &len);
}
mobile.h