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Update 667a6cf Feb 19, 2016
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/*
* mfrc522.c
*
* Copyright 2013 Shimon <shimon@monistit.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*
*/
#include <mfrc522.h>
#include <spi.h>
#if 1
#include <lcd.h>
#endif
void mfrc522_init()
{
uint8_t byte;
mfrc522_reset();
mfrc522_write(TModeReg, 0x8D);
mfrc522_write(TPrescalerReg, 0x3E);
mfrc522_write(TReloadReg_1, 30);
mfrc522_write(TReloadReg_2, 0);
mfrc522_write(TxASKReg, 0x40);
mfrc522_write(ModeReg, 0x3D);
byte = mfrc522_read(TxControlReg);
if(!(byte&0x03))
{
mfrc522_write(TxControlReg,byte|0x03);
}
}
void mfrc522_write(uint8_t reg, uint8_t data)
{
ENABLE_CHIP();
spi_transmit((reg<<1)&0x7E);
spi_transmit(data);
DISABLE_CHIP();
}
uint8_t mfrc522_read(uint8_t reg)
{
uint8_t data;
ENABLE_CHIP();
spi_transmit(((reg<<1)&0x7E)|0x80);
data = spi_transmit(0x00);
DISABLE_CHIP();
return data;
}
void mfrc522_reset()
{
mfrc522_write(CommandReg,SoftReset_CMD);
}
uint8_t mfrc522_request(uint8_t req_mode, uint8_t * tag_type)
{
uint8_t status;
uint32_t backBits;//The received data bits
mfrc522_write(BitFramingReg, 0x07);//TxLastBists = BitFramingReg[2..0] ???
tag_type[0] = req_mode;
status = mfrc522_to_card(Transceive_CMD, tag_type, 1, tag_type, &backBits);
if ((status != CARD_FOUND) || (backBits != 0x10))
{
status = ERROR;
}
return status;
}
uint8_t mfrc522_to_card(uint8_t cmd, uint8_t *send_data, uint8_t send_data_len, uint8_t *back_data, uint32_t *back_data_len)
{
uint8_t status = ERROR;
uint8_t irqEn = 0x00;
uint8_t waitIRq = 0x00;
uint8_t lastBits;
uint8_t n;
uint8_t tmp;
uint32_t i;
switch (cmd)
{
case MFAuthent_CMD: //Certification cards close
{
irqEn = 0x12;
waitIRq = 0x10;
break;
}
case Transceive_CMD: //Transmit FIFO data
{
irqEn = 0x77;
waitIRq = 0x30;
break;
}
default:
break;
}
//mfrc522_write(ComIEnReg, irqEn|0x80); //Interrupt request
n=mfrc522_read(ComIrqReg);
mfrc522_write(ComIrqReg,n&(~0x80));//clear all interrupt bits
n=mfrc522_read(FIFOLevelReg);
mfrc522_write(FIFOLevelReg,n|0x80);//flush FIFO data
mfrc522_write(CommandReg, Idle_CMD); //NO action; Cancel the current cmd???
//Writing data to the FIFO
for (i=0; i<send_data_len; i++)
{
mfrc522_write(FIFODataReg, send_data[i]);
}
//Execute the cmd
mfrc522_write(CommandReg, cmd);
if (cmd == Transceive_CMD)
{
n=mfrc522_read(BitFramingReg);
mfrc522_write(BitFramingReg,n|0x80);
}
//Waiting to receive data to complete
i = 2000; //i according to the clock frequency adjustment, the operator M1 card maximum waiting time 25ms???
do
{
//CommIrqReg[7..0]
//Set1 TxIRq RxIRq IdleIRq HiAlerIRq LoAlertIRq ErrIRq TimerIRq
n = mfrc522_read(ComIrqReg);
i--;
}
while ((i!=0) && !(n&0x01) && !(n&waitIRq));
tmp=mfrc522_read(BitFramingReg);
mfrc522_write(BitFramingReg,tmp&(~0x80));
if (i != 0)
{
if(!(mfrc522_read(ErrorReg) & 0x1B)) //BufferOvfl Collerr CRCErr ProtecolErr
{
status = CARD_FOUND;
if (n & irqEn & 0x01)
{
status = CARD_NOT_FOUND; //??
}
if (cmd == Transceive_CMD)
{
n = mfrc522_read(FIFOLevelReg);
lastBits = mfrc522_read(ControlReg) & 0x07;
if (lastBits)
{
*back_data_len = (n-1)*8 + lastBits;
}
else
{
*back_data_len = n*8;
}
if (n == 0)
{
n = 1;
}
if (n > MAX_LEN)
{
n = MAX_LEN;
}
//Reading the received data in FIFO
for (i=0; i<n; i++)
{
back_data[i] = mfrc522_read(FIFODataReg);
}
}
}
else
{
status = ERROR;
}
}
//SetBitMask(ControlReg,0x80); //timer stops
//mfrc522_write(cmdReg, PCD_IDLE);
return status;
}
uint8_t mfrc522_get_card_serial(uint8_t * serial_out)
{
uint8_t status;
uint8_t i;
uint8_t serNumCheck=0;
uint32_t unLen;
mfrc522_write(BitFramingReg, 0x00); //TxLastBists = BitFramingReg[2..0]
serial_out[0] = PICC_ANTICOLL;
serial_out[1] = 0x20;
status = mfrc522_to_card(Transceive_CMD, serial_out, 2, serial_out, &unLen);
if (status == CARD_FOUND)
{
//Check card serial number
for (i=0; i<4; i++)
{
serNumCheck ^= serial_out[i];
}
if (serNumCheck != serial_out[i])
{
status = ERROR;
}
}
return status;
}
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