libs/RFID.MFRC522
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changeable spi class and settings

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This commit is contained in:
Rotzbua
2017-05-13 03:59:21 +02:00
parent f82bcc4046
commit 9c221e59ee
2 changed files with 30 additions and 33 deletions
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46
src/MFRC522.cpp
View File

@@ -11,16 +11,6 @@
// Functions for setting up the Arduino
/////////////////////////////////////////////////////////////////////////////////////
/**
* Constructor.
* Prepares the output pins.
*/
MFRC522::MFRC522( byte chipSelectPin, ///< Arduino pin connected to MFRC522's SPI slave select input (Pin 24, NSS, active low)
byte resetPowerDownPin ///< Arduino pin connected to MFRC522's reset and power down input (Pin 6, NRSTPD, active low). If there is no connection from the CPU to NRSTPD, set this to constant UNUSED_PIN. In this case, only soft reset will be used in PCD_Init().
) {
_chipSelectPin = chipSelectPin;
_resetPowerDownPin = resetPowerDownPin;
} // End constructor
/////////////////////////////////////////////////////////////////////////////////////
// Basic interface functions for communicating with the MFRC522
@@ -33,12 +23,12 @@ MFRC522::MFRC522( byte chipSelectPin, ///< Arduino pin connected to MFRC522's S
void MFRC522::PCD_WriteRegister( PCD_Register reg, ///< The register to write to. One of the PCD_Register enums.
byte value ///< The value to write.
) {
SPI.beginTransaction(SPISettings(MFRC522_SPICLOCK, MSBFIRST, SPI_MODE0)); // Set the settings to work with SPI bus
_spiClass->beginTransaction(_spiSettings); // Set the settings to work with SPI bus
digitalWrite(_chipSelectPin, LOW); // Select slave
SPI.transfer(reg); // MSB == 0 is for writing. LSB is not used in address. Datasheet section 8.1.2.3.
SPI.transfer(value);
_spiClass->transfer(reg); // MSB == 0 is for writing. LSB is not used in address. Datasheet section 8.1.2.3.
_spiClass->transfer(value);
digitalWrite(_chipSelectPin, HIGH); // Release slave again
SPI.endTransaction(); // Stop using the SPI bus
_spiClass->endTransaction(); // Stop using the SPI bus
} // End PCD_WriteRegister()
/**
@@ -49,14 +39,14 @@ void MFRC522::PCD_WriteRegister( PCD_Register reg, ///< The register to write to
byte count, ///< The number of bytes to write to the register
byte *values ///< The values to write. Byte array.
) {
SPI.beginTransaction(SPISettings(MFRC522_SPICLOCK, MSBFIRST, SPI_MODE0)); // Set the settings to work with SPI bus
_spiClass->beginTransaction(_spiSettings); // Set the settings to work with SPI bus
digitalWrite(_chipSelectPin, LOW); // Select slave
SPI.transfer(reg); // MSB == 0 is for writing. LSB is not used in address. Datasheet section 8.1.2.3.
_spiClass->transfer(reg); // MSB == 0 is for writing. LSB is not used in address. Datasheet section 8.1.2.3.
for (byte index = 0; index < count; index++) {
SPI.transfer(values[index]);
_spiClass->transfer(values[index]);
}
digitalWrite(_chipSelectPin, HIGH); // Release slave again
SPI.endTransaction(); // Stop using the SPI bus
_spiClass->endTransaction(); // Stop using the SPI bus
} // End PCD_WriteRegister()
/**
@@ -66,12 +56,12 @@ void MFRC522::PCD_WriteRegister( PCD_Register reg, ///< The register to write to
byte MFRC522::PCD_ReadRegister( PCD_Register reg ///< The register to read from. One of the PCD_Register enums.
) {
byte value;
SPI.beginTransaction(SPISettings(MFRC522_SPICLOCK, MSBFIRST, SPI_MODE0)); // Set the settings to work with SPI bus
_spiClass->beginTransaction(_spiSettings); // Set the settings to work with SPI bus
digitalWrite(_chipSelectPin, LOW); // Select slave
SPI.transfer(0x80 | reg); // MSB == 1 is for reading. LSB is not used in address. Datasheet section 8.1.2.3.
value = SPI.transfer(0); // Read the value back. Send 0 to stop reading.
_spiClass->transfer(0x80 | reg); // MSB == 1 is for reading. LSB is not used in address. Datasheet section 8.1.2.3.
value = _spiClass->transfer(0); // Read the value back. Send 0 to stop reading.
digitalWrite(_chipSelectPin, HIGH); // Release slave again
SPI.endTransaction(); // Stop using the SPI bus
_spiClass->endTransaction(); // Stop using the SPI bus
return value;
} // End PCD_ReadRegister()
@@ -90,26 +80,26 @@ void MFRC522::PCD_ReadRegister( PCD_Register reg, ///< The register to read from
//Serial.print(F("Reading ")); Serial.print(count); Serial.println(F(" bytes from register."));
byte address = 0x80 | reg; // MSB == 1 is for reading. LSB is not used in address. Datasheet section 8.1.2.3.
byte index = 0; // Index in values array.
SPI.beginTransaction(SPISettings(MFRC522_SPICLOCK, MSBFIRST, SPI_MODE0)); // Set the settings to work with SPI bus
_spiClass->beginTransaction(_spiSettings); // Set the settings to work with SPI bus
digitalWrite(_chipSelectPin, LOW); // Select slave
count--; // One read is performed outside of the loop
SPI.transfer(address); // Tell MFRC522 which address we want to read
_spiClass->transfer(address); // Tell MFRC522 which address we want to read
if (rxAlign) { // Only update bit positions rxAlign..7 in values[0]
// Create bit mask for bit positions rxAlign..7
byte mask = (0xFF << rxAlign) & 0xFF;
// Read value and tell that we want to read the same address again.
byte value = SPI.transfer(address);
byte value = _spiClass->transfer(address);
// Apply mask to both current value of values[0] and the new data in value.
values[0] = (values[0] & ~mask) | (value & mask);
index++;
}
while (index < count) {
values[index] = SPI.transfer(address); // Read value and tell that we want to read the same address again.
values[index] = _spiClass->transfer(address); // Read value and tell that we want to read the same address again.
index++;
}
values[index] = SPI.transfer(0); // Read the final byte. Send 0 to stop reading.
values[index] = _spiClass->transfer(0); // Read the final byte. Send 0 to stop reading.
digitalWrite(_chipSelectPin, HIGH); // Release slave again
SPI.endTransaction(); // Stop using the SPI bus
_spiClass->endTransaction(); // Stop using the SPI bus
} // End PCD_ReadRegister()
/**

17
src/MFRC522.h
View File

@@ -83,8 +83,6 @@
#include <Arduino.h>
#include <SPI.h>
#define MFRC522_SPICLOCK SPI_CLOCK_DIV4 // MFRC522 accept upto 10MHz
// Firmware data for self-test
// Reference values based on firmware version
// Hint: if needed, you can remove unused self-test data to save flash memory
@@ -327,13 +325,15 @@ public:
} MIFARE_Key;
// Member variables
Uid uid; // Used by PICC_ReadCardSerial().
Uid uid; // Used by PICC_ReadCardSerial().
/////////////////////////////////////////////////////////////////////////////////////
// Functions for setting up the Arduino
/////////////////////////////////////////////////////////////////////////////////////
MFRC522() : MFRC522(UNUSED_PIN, UNUSED_PIN) {};
MFRC522(byte chipSelectPin, byte resetPowerDownPin);
MFRC522(SPIClass *spiClass = &SPI, const SPISettings spiSettings = SPISettings(SPI_CLOCK_DIV4, MSBFIRST, SPI_MODE0))
: _spiClass(spiClass), _spiSettings(spiSettings), _chipSelectPin(UNUSED_PIN), _resetPowerDownPin(UNUSED_PIN) {};
MFRC522(byte chipSelectPin, byte resetPowerDownPin)
: _chipSelectPin(chipSelectPin), _resetPowerDownPin(resetPowerDownPin) { MFRC522(); };
/////////////////////////////////////////////////////////////////////////////////////
// Basic interface functions for communicating with the MFRC522
@@ -421,8 +421,15 @@ public:
virtual bool PICC_ReadCardSerial();
protected:
// Pins
byte _chipSelectPin; // Arduino pin connected to MFRC522's SPI slave select input (Pin 24, NSS, active low)
byte _resetPowerDownPin; // Arduino pin connected to MFRC522's reset and power down input (Pin 6, NRSTPD, active low)
// SPI communication
SPIClass *_spiClass; // SPI class which abstracts hardware.
const SPISettings _spiSettings; // SPI settings.
// Functions for communicating with MIFARE PICCs
StatusCode MIFARE_TwoStepHelper(byte command, byte blockAddr, int32_t data);
};