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Add get/set methods for MIFARE Classic value blocks

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This commit is contained in:
mdxs
2014-11-24 11:46:57 +01:00
parent 18af147959
commit 16a035c89c
4 changed files with 69 additions and 48 deletions
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56
MFRC522.cpp
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@@ -958,6 +958,62 @@ byte MFRC522::MIFARE_Transfer( byte blockAddr ///< The block (0-0xff) number.
return STATUS_OK;
} // End MIFARE_Transfer()
/**
* Helper routine to read the current value from a Value Block.
*
* Only for MIFARE Classic and only for blocks in "value block" mode, that
* is: with access bits [C1 C2 C3] = [110] or [001]. The sector containing
* the block must be authenticated before calling this function.
*
* @param[in] blockAddr The block (0x00-0xff) number.
* @param[out] value Current value of the Value Block.
* @return STATUS_OK on success, STATUS_??? otherwise.
*/
byte MFRC522::MIFARE_GetValue(byte blockAddr, long *value) {
byte status;
byte buffer[18];
byte size = sizeof(buffer);
// Read the block
status = MIFARE_Read(blockAddr, buffer, &size);
if (status == STATUS_OK) {
// Extract the value
*value = (long(buffer[3])<<24) | (long(buffer[2])<<16) | (long(buffer[1])<<8) | long(buffer[0]);
}
return status;
} // End MIFARE_GetValue()
/**
* Helper routine to write a specific value into a Value Block.
*
* Only for MIFARE Classic and only for blocks in "value block" mode, that
* is: with access bits [C1 C2 C3] = [110] or [001]. The sector containing
* the block must be authenticated before calling this function.
*
* @param[in] blockAddr The block (0x00-0xff) number.
* @param[in] value New value of the Value Block.
* @return STATUS_OK on success, STATUS_??? otherwise.
*/
byte MFRC522::MIFARE_SetValue(byte blockAddr, long value) {
byte buffer[18];
// Translate the long into 4 bytes; repeated 2x in value block
buffer[0] = buffer[ 8] = (value & 0xFF);
buffer[1] = buffer[ 9] = (value & 0xFF00) >> 8;
buffer[2] = buffer[10] = (value & 0xFF0000) >> 16;
buffer[3] = buffer[11] = (value & 0xFF000000) >> 24;
// Inverse 4 bytes also found in value block
buffer[4] = ~buffer[0];
buffer[5] = ~buffer[1];
buffer[6] = ~buffer[2];
buffer[7] = ~buffer[3];
// Address 2x with inverse address 2x
buffer[12] = buffer[14] = blockAddr;
buffer[13] = buffer[15] = ~blockAddr;
// Write the whole data block
return MIFARE_Write(blockAddr, buffer, 16);
} // End MIFARE_SetValue()
/////////////////////////////////////////////////////////////////////////////////////
// Support functions

4
MFRC522.h
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@@ -314,7 +314,9 @@ public:
byte MIFARE_Restore(byte blockAddr);
byte MIFARE_Transfer(byte blockAddr);
byte MIFARE_Ultralight_Write(byte page, byte *buffer, byte bufferSize);
byte MIFARE_GetValue(byte blockAddr, long *value);
byte MIFARE_SetValue(byte blockAddr, long value);
/////////////////////////////////////////////////////////////////////////////////////
// Support functions
/////////////////////////////////////////////////////////////////////////////////////

55
examples/MifareClassicValueBlock/MifareClassicValueBlock.ino
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@@ -1,4 +1,4 @@
/*
/**
* ----------------------------------------------------------------------------
* This is a MFRC522 library example; see https://github.com/miguelbalboa/rfid
* for further details and other examples.
@@ -37,7 +37,7 @@ MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
MFRC522::MIFARE_Key key;
/*
/**
* Initialize.
*/
void setup() {
@@ -59,7 +59,7 @@ void setup() {
Serial.println("BEWARE: Data will be written to the PICC, in sector #1");
}
/*
/**
* Main loop.
*/
void loop() {
@@ -207,7 +207,7 @@ void loop() {
return;
}
// Show the new value of valueBlockA
status = mifare_GetValue(valueBlockA, &value);
status = mfrc522.MIFARE_GetValue(valueBlockA, &value);
if (status != MFRC522::STATUS_OK) {
Serial.print("mifare_GetValue() failed: ");
Serial.println(mfrc522.GetStatusCodeName(status));
@@ -231,7 +231,7 @@ void loop() {
return;
}
// Show the new value of valueBlockB
status = mifare_GetValue(valueBlockB, &value);
status = mfrc522.MIFARE_GetValue(valueBlockB, &value);
if (status != MFRC522::STATUS_OK) {
Serial.print("mifare_GetValue() failed: ");
Serial.println(mfrc522.GetStatusCodeName(status));
@@ -242,7 +242,7 @@ void loop() {
// Check some boundary...
if (value <= -100) {
Serial.println("Below -100, so resetting it to 255 = 0xFF just for fun...");
status = mifare_SetValue(valueBlockB, 255);
status = mfrc522.MIFARE_SetValue(valueBlockB, 255);
if (status != MFRC522::STATUS_OK) {
Serial.print("mifare_SetValue() failed: ");
Serial.println(mfrc522.GetStatusCodeName(status));
@@ -260,7 +260,7 @@ void loop() {
mfrc522.PCD_StopCrypto1();
}
/*
/**
* Helper routine to dump a byte array as hex values to Serial.
*/
void dump_byte_array(byte *buffer, byte bufferSize) {
@@ -270,46 +270,7 @@ void dump_byte_array(byte *buffer, byte bufferSize) {
}
}
/*
* Helper routine to read the current value from a Value Block.
*/
byte mifare_GetValue(byte blockAddr, long *value) {
byte status;
byte buffer[18];
byte size = sizeof(buffer);
status = mfrc522.MIFARE_Read(blockAddr, buffer, &size);
if (status == MFRC522::STATUS_OK) {
*value = (long(buffer[3])<<24) | (long(buffer[2])<<16) | (long(buffer[1])<<8) | long(buffer[0]);
}
return status;
}
/*
* Helper routine to write a value into a Value Block.
*/
byte mifare_SetValue(byte blockAddr, long value) {
byte buffer[18];
// Translate the long into 4 bytes; repeated 2x in value block
buffer[0] = buffer[ 8] = (value & 0xFF);
buffer[1] = buffer[ 9] = (value & 0xFF00) >> 8;
buffer[2] = buffer[10] = (value & 0xFF0000) >> 16;
buffer[3] = buffer[11] = (value & 0xFF000000) >> 24;
// Inverse 4 bytes also found in value block
buffer[4] = ~buffer[0];
buffer[5] = ~buffer[1];
buffer[6] = ~buffer[2];
buffer[7] = ~buffer[3];
// Address 2x with inverse address 2x
buffer[12] = buffer[14] = blockAddr;
buffer[13] = buffer[15] = ~blockAddr;
// Write the whole data block
return mfrc522.MIFARE_Write(blockAddr, buffer, 16);
}
/*
/**
* Ensure that a given block is formatted as a Value Block.
*/
void formatValueBlock(byte blockAddr) {

2
keywords.txt
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@@ -47,6 +47,8 @@ MIFARE_Read KEYWORD2
MIFARE_Write KEYWORD2
MIFARE_Increment KEYWORD2
MIFARE_Ultralight_Write KEYWORD2
MIFARE_GetValue KEYWORD2
MIFARE_SetValue KEYWORD2
PCD_MIFARE_Transceive KEYWORD2
PICC_GetType KEYWORD2
PICC_DumpToSerial KEYWORD2