#include <SPI.h>
#include <MFRC522.h>
constexpr uint8_t RST_PIN = 9;
constexpr uint8_t SS_PIN = 10;
MFRC522 mfrc522(SS_PIN, RST_PIN);
char c;
void setup() {
Serial.begin(9600);
SPI.begin();
mfrc522.PCD_Init();
}
void loop() {
Serial.println("1.- Escribir");
Serial.println("2.- Leer");
while(!Serial.available()){}
c=Serial.read();
switch(c)
{
case '1':
Escribir();
break;
case '2':
Leer();
break;
}
}
void Escribir()
{
MFRC522::MIFARE_Key key;
byte buffer[34];
byte block;
MFRC522::StatusCode status;
byte len;
Serial.println("Escribe un codigo y finaliza con #");
Serial.setTimeout(20000L) ;
len = Serial.readBytesUntil('#', (char ) buffer, 30) ;
for (byte i = len; i < 30; i++) buffer = ' ';
_ for (byte i = 0; i < 6; i++) key.keyByte = 0xFF;_
while ( ! mfrc522.PICC_IsNewCardPresent()) {*
* }*
* while ( ! mfrc522.PICC_ReadCardSerial()) {*
* }*
* for (byte i = 0; i < mfrc522.uid.size; i++) {*
* }*
* MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
_ block = 1;_
status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, block, &key, &(mfrc522.uid));
if (status != MFRC522::STATUS_OK) {
_ return;_
_ }_
status = mfrc522.MIFARE_Write(block, buffer, 16);
if (status != MFRC522::STATUS_OK) {
_ return;_
_ } _
_ Serial.println("Escrito Correctamente");_
mfrc522.PICC_HaltA();
mfrc522.PCD_StopCrypto1();
_ }_
_ void Leer()_
_ {_
MFRC522::MIFARE_Key key;
_ for (byte i = 0; i < 6; i++) key.keyByte = 0xFF;
byte block;
byte len;
MFRC522::StatusCode status;
Serial.print("Pase tarjeta");_
while ( ! mfrc522.PICC_IsNewCardPresent()) {*
* }*
* while ( ! mfrc522.PICC_ReadCardSerial()) {*
* }*
* len = 18;*
* byte buffer2[18];*
* block = 1;*
* status = mfrc522.PCD_Authenticate (MFRC522::PICC_CMD_MF_AUTH_KEY_A, 1, &key, &(mfrc522.uid));
if (status !=MFRC522::STATUS_OK) {*
* }*
* status = mfrc522.MIFARE_Read(block, buffer2, &len);
if (status != MFRC522::STATUS_OK) {
_ }
String data="";_
for (uint8_t i = 0; i < 16; i++) {
_ data+=(char)buffer2;
}*_
* Serial.println(data);*
* delay(500);*
* mfrc522.PICC_HaltA();
mfrc522.PCD_StopCrypto1();
_ }*_