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incubator-nuttx/drivers/contactless/mfrc522.h

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/****************************************************************************
* drivers/contactless/mfrc522.h
*
* Copyright(C) 2016 Uniquix Ltda. All rights reserved.
* Authors: Alan Carvalho de Assis <acassis@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES(INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#ifndef __DRIVERS_CONTACTLESS_MFRC522_H
#define __DRIVERS_CONTACTLESS_MFRC522_H 1
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <nuttx/spi/spi.h>
#include <nuttx/wqueue.h>
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* The commands used by the PCD to manage communication with several PICCs
* (ISO 14443-3, Type A, section 6.4)
*/
#define PICC_CMD_REQA 0x26 /* REQuest command, Type A */
#define PICC_CMD_WUPA 0x52 /* Wake-UP command, Type A */
#define PICC_CMD_CT 0x88 /* Cascade Tag, used during anti collision. */
#define PICC_CMD_SEL_CL1 0x93 /* Anti collision/Select, Cascade Level 1 */
#define PICC_CMD_SEL_CL2 0x95 /* Anti collision/Select, Cascade Level 2 */
#define PICC_CMD_SEL_CL3 0x97 /* Anti collision/Select, Cascade Level 3 */
#define PICC_CMD_HLTA 0x50 /* HaLT command, Type A */
/* The commands used for MIFARE Classic
* (from http://www.mouser.com/ds/2/302/MF1S503x-89574.pdf, Section 9)
* Use PCD_MFAuthent to authenticate access to a sector, then use these
* commands to read/write/modify the blocks on the sector.
* The read/write commands can also be used for MIFARE Ultralight.
*/
#define PICC_CMD_MF_AUTH_KEY_A 0x60 /* Perform authentication with Key A */
#define PICC_CMD_MF_AUTH_KEY_B 0x61 /* Perform authentication with Key B */
#define PICC_CMD_MF_READ 0x30 /* Reads one 16 byte block from auth sector */
#define PICC_CMD_MF_WRITE 0xA0 /* Writes one 16 byte block to auth senctor */
#define PICC_CMD_MF_DECREMENT 0xC0 /* Decrements contents of a block */
#define PICC_CMD_MF_INCREMENT 0xC1 /* Increments contents of a block */
#define PICC_CMD_MF_RESTORE 0xC2 /* Reads the contents of a block */
#define PICC_CMD_MF_TRANSFER 0xB0 /* Writes the contents of a block */
/* The commands used for MIFARE Ultralight
* (from http://www.nxp.com/documents/data_sheet/MF0ICU1.pdf, Section 8.6)
* The PICC_CMD_MF_READ/_MF_WRITE can also be used for MIFARE Ultralight.
*/
#define PICC_CMD_UL_WRITE 0xA2 /* Writes one 4 byte page to the PICC. */
/* MFRC522 Registers */
/* NOTE: All SPI addresses are shifted one bit left in the SPI address byte
* See section 8.1.2.3 from MFRC522 datasheet
*/
/* Page 0: Commands and status */
/* 0x00 - reserved for future use */
#define MFRC522_COMMAND_REG (0x01 << 1) /* starts/stops command execution */
#define MFRC522_COM_IEN_REG (0x02 << 1) /* dis/enable int. req. ctrl bits */
#define MFRC522_DIV_IEN_REG (0x03 << 1) /* dis/enable int. req. ctrl bits */
#define MFRC522_COM_IRQ_REG (0x04 << 1) /* interrupt request bits */
#define MFRC522_DIV_IRQ_REG (0x05 << 1) /* interrupt request bits */
#define MFRC522_ERROR_REG (0x06 << 1) /* error bits status of last cmd */
#define MFRC522_STATUS1_REG (0x07 << 1) /* communication status bits */
#define MFRC522_STATUS2_REG (0x08 << 1) /* rcvr and transmitter status */
#define MFRC522_FIFO_DATA_REG (0x09 << 1) /* input/output of FIFO buffer */
#define MFRC522_FIFO_LEVEL_REG (0x0A << 1) /* number of bytes stored in the FIFO */
#define MFRC522_WATER_LEVEL_REG (0x0B << 1) /* level for FIFO under/overflow */
#define MFRC522_CONTROL_REG (0x0C << 1) /* miscellaneos control register */
#define MFRC522_BIT_FRAMING_REG (0x0D << 1) /* adjustments for bit-oriented frames */
#define MFRC522_COLL_REG (0x0E << 1) /* bit position of first bit-collision detected */
/* 0x0F - reserved for future use */
/* Page 1: Commands */
/* 0x10 - reserved for future use */
#define MFRC522_MODE_REG (0x11 << 1) /* defines general modes for transmit/receive */
#define MFRC522_TX_MODE_REG (0x12 << 1) /* defines transmission data rate and framing */
#define MFRC522_RX_MODE_REG (0x13 << 1) /* defines reception data rate and framing */
#define MFRC522_TX_CTRL_REG (0x14 << 1) /* controls antenna driver pins TX1 and TX2 */
#define MFRC522_TX_ASK_REG (0x15 << 1) /* controls the setting of transmission modulation */
#define MFRC522_TX_SEL_REG (0x16 << 1) /* selects the internal sources for antenna driver */
#define MFRC522_RX_SEL_REG (0x17 << 1) /* selects the internal receiver settings */
#define MFRC522_RX_THLD_REG (0x18 << 1) /* selects the thresholds for bit decoder */
#define MFRC522_DEMOD_REG (0x19 << 1) /* defines demodulator settings */
/* 0x1A - reserved for future use */
/* 0x1B - reserved for future use */
#define MFRC522_MF_TX_REG (0x1C << 1) /* controls some MIFARE comm tx param */
#define MFRC522_MF_RX_REG (0x1D << 1) /* controls some MIFARE comm rx param */
/* 0x1E - reserved for future use */
#define MFRC522_SERIAL_SPD_REG (0x1F << 1) /* selects the speed of the serial UART */
/* Page 2: Configuration */
/* 0x20 - reserved for future use */
#define MFRC522_CRC_RESULT_REGH (0x21 << 1) /* shows the MSB values of CRC calc. */
#define MFRC522_CRC_RESULT_REGL (0x22 << 1) /* shows the LSB values of CRC calc. */
/* 0x23 - reserved for future use */
#define MFRC522_MOD_WIDTH_REG (0x24 << 1) /* controls the ModWidth setting */
/* 0x25 - reserved for future use */
#define MFRC522_RF_CFG_REG (0x26 << 1) /* configures the receiver gain */
#define MFRC522_GSN_REG (0x27 << 1) /* selects the conductance of n-driver TX1/2 */
#define MFRC522_CW_GSP_REG (0x28 << 1) /* defines the conductance of p-driver during no modulation */
#define MFRC522_MOD_GSP_REG (0x29 << 1) /* defines the conductance of p-driver during modulation */
#define MFRC522_TMODE_REG (0x2A << 1) /* defines settings for the internal timer */
#define MFRC522_TPRESCALER_REG (0x2B << 1) /* the lower 8 bits of TPrescaler value */
#define MFRC522_TRELOAD_REGH (0x2C << 1) /* defines the 16-bit timer reload value */
#define MFRC522_TRELOAD_REGL (0x2D << 1) /* defines the 16-bit timer reload value */
#define MFRC522_TCOUNT_VAL_REGH (0x2E << 1) /* shows the 16-bit timer value */
#define MFRC522_TCOUNT_VAL_REGL (0x2F << 1) /* shows the 16-bit timer value */
/* Page 3: Test Registers */
/* 0x30 - reserved for future use */
#define MFRC522_TEST_SEL1_REG (0x31 << 1) /* general test signal configuration */
#define MFRC522_TEST_SEL2_REG (0x32 << 1) /* general test signal configuration */
#define MFRC522_TEST_PIN_EN_REG (0x33 << 1) /* enables pin output driver on pins D1 to D7 */
#define MFRC522_TEST_PIN_VAL_REG (0x34 << 1) /* defines the values to D1 to D7 */
#define MFRC522_TEST_BUS_REG (0x35 << 1) /* shows the status of the internal test bus */
#define MFRC522_AUTOTEST_REG (0x36 << 1) /* controls the digital self test */
#define MFRC522_VERSION_REG (0x37 << 1) /* shows the software version */
#define MFRC522_ANALOG_TEST_REG (0x38 << 1) /* controls the pins AUX1 and AUX2 */
#define MFRC522_TEST_DAC1_REG (0x39 << 1) /* defines the test value for TestDAC1 */
#define MFRC522_TEST_DAC2_REG (0x3A << 1) /* defines the test value for TestDAC2 */
#define MFRC522_TEST_ADC_REG (0x3B << 1) /* show the value of ADC I and Q channels */
/* Section 9.3.1.2: MFRC522 Command Register */
#define MFRC522_CMD_MASK 0x0F
# define MFRC522_IDLE_CMD 0x00 /* no action, cancels current command execution */
# define MFRC522_MEM_CMD 0x01 /* stores 25 bytes into the internal buffer */
# define MFRC522_GEN_RND_ID_CMD 0x02 /* generates a 10-bytes random ID number */
# define MFRC522_CALC_CRC_CMD 0x03 /* activates the CRC coprocessor or self test */
# define MFRC522_TRANSMIT_CMD 0x04 /* transmits data from the FIFO buffer */
# define MFRC522_NO_CHANGE_CMD 0x07 /* no command change, used to modify CommandReg */
# define MFRC522_RECEIVE_CMD 0x08 /* activates the receiver circuits */
# define MFRC522_TRANSCV_CMD 0x0C /* transmits data from FIFO and receive automatically */
# define MFRC522_MF_AUTH_CMD 0x0E /* performs the MIFARE stand authentication as a reader */
# define MFRC522_SOFTRST_CMD 0x0F /* resets the MFRC522 */
#define MFRC522_POWER_DOWN (1 << 4) /* soft power-down mode entered */
#define MFRC522_RCV_OFF (1 << 5) /* turns off analog part of receiver */
/* Section 9.3.1.3: ComIEnReg register */
#define MFRC522_TIMER_IEN (1 << 0) /* allows the timer interrupt request on pin IRQ */
#define MFRC522_ERR_IEN (1 << 1) /* allows the error interrupt request on pin IRQ */
#define MFRC522_LO_ALERT_IEN (1 << 2) /* allows the low alert interrupt request on pin IRQ */
#define MFRC522_HI_ALERT_IEN (1 << 3) /* allows the high alert interrupt request on pin IRQ */
#define MFRC522_IDLE_IEN (1 << 4) /* allows the idle interrupt request on pin IRQ */
#define MFRC522_RX_IEN (1 << 5) /* allows the receiver interrupt request on pin IRQ */
#define MFRC522_TX_IEN (1 << 6) /* allows the transmitter interrupt request on pin IRQ */
#define MFRC522_IRQ_INV (1 << 7) /* signal on pin IRQ is inverse of IRq bit from Status1Reg */
/* Section 9.3.1.4: DivIEnReg register */
#define MFRC522_CRC_IEN (1 << 2) /* allows the CRC interrupt request on pin IRQ */
#define MFRC522_MFIN_ACT_IEN (1 << 4) /* allows the MFIN active interrupt request on pin IRQ */
#define MFRC522_IRQ_PUSH_PULL (1 << 7) /* 1 = IRQ pin is a standard CMOS output pin, 0 = open-drain */
/* Section 9.3.1.5: ComIrqReg register */
#define MFRC522_COM_IRQ_MASK (0x7F)
#define MFRC522_TIMER_IRQ (1 << 0) /* enabled when TCounterValReg reaches value 0 */
#define MFRC522_ERR_IRQ (1 << 1) /* any error bit in the ErrorReg register is set */
#define MFRC522_LO_ALERT_IRQ (1 << 2) /* Status1Reg register’s LoAlert bit is set */
#define MFRC522_HI_ALERT_IRQ (1 << 3) /* Status1Reg register’s HiAlert bit is set */
#define MFRC522_IDLE_IRQ (1 << 4) /* if a command terminates this bit is set */
#define MFRC522_RX_IRQ (1 << 5) /* receiver has detected the end of a valid data stream */
#define MFRC522_TX_IRQ (1 << 6) /* set immediately after the last data bit was transmitted */
#define MFRC522_SET1 (1 << 7) /* indicate the status of ComIrqReg bits */
/* Section 9.3.1.6: DivIrqReg register */
#define MFRC522_CRC_IRQ (1 << 2) /* the CalcCRC command is active and all data is processed */
#define MFRC522_MFIN_ACT_IRQ (1 << 4) /* MFIN is active, int is set on rising/falling signal edge */
#define MFRC522_SET2 (1 << 7) /* indicates the status of the marked bits in the DivIrqReg */
/* Section 9.3.1.7: ErrorReg register */
#define MFRC522_PROTO_ERR (1 << 0) /* set if the SOF is incorrect or during MFAuthent if data is incorrect */
#define MFRC522_PARITY_ERR (1 << 1) /* parity check failed */
#define MFRC522_CRC_ERR (1 << 2) /* the RxCRCEn bit is set and the CRC calculation fails */
#define MFRC522_COLL_ERR (1 << 3) /* a bit-collision is detected */
#define MFRC522_BUF_OVFL_ERR (1 << 4) /* FIFO is full and the host or internal state machine try to write data */
#define MFRC522_TEMP_ERR (1 << 6) /* internal temperature sensor detects overheating */
#define MFRC522_WR_ERR (1 << 7) /* data write error in the FIFO, host writing to FIFO at the wrong time */
/* Section 9.3.1.8: Status1Reg register */
#define MFRC522_LO_ALERT (1 << 0) /* number of bytes on FIFO lower than the water-mark */
#define MFRC522_HI_ALERT (1 << 1) /* number of bytes on FIFO higher than the water-mark */
#define MFRC522_TRUNNING (1 << 3) /* timer is running */
#define MFRC522_IRQ (1 << 4) /* indicates if any interrupt source requests attention */
#define MFRC522_CRC_READY (1 << 5) /* the CRC calculation has finished */
#define MFRC522_CRC_OK (1 << 6) /* when the calculation is done correctly this bit change to 1 */
/* Section 9.3.1.9: Status2Reg register */
#define MFRC522_MODEM_STATE_MASK (7 << 0) /* shows the state of the transmitter and receiver state machine */
#define MFRC522_MODEM_IDLE (0) /* idle */
#define MFRC522_MODEM_WAIT_BFR (1) /* wait for the BitFramingReg register’s StartSend bit */
#define MFRC522_MODEM_TXWAIT (2) /* wait until RF field is present if TxWaitRF bit is set to 1 */
#define MFRC522_MODEM_TXING (3) /* transmitting */
#define MFRC522_MODEM_RXWAIT (4) /* wait until RF field is present if TxWaitRF bit is set to 1 */
#define MFRC522_MODEM_WAIT_DATA (5) /* wait for data */
#define MFRC522_MODEM_RXING (6) /* receiving */
#define MFRC522_MF_CRYPTO1_ON (1 << 3) /* MIFARE Crypto1 unit is switched on */
#define MFRC522_I2C_FORCE_HS (1 << 6) /* set the I2C to high-speed mode (R/W bit) */
#define MFRC522_TEMP_SENS_CLEAR (1 << 7) /* clears the temperature error if it is below 125C (R/W bit) */
/* Section 9.3.1.10: FIFODataReg register */
#define MFRC522_FIFO_DATA_MASK (0xFF) /* Input and output of 64 byte FIFO buffer */
/* Section 9.3.1.11: FIFOLevelReg register */
#define MFRC522_FIFOLEVEL_MASK (0x7F) /* indicates the number of bytes stored in the FIFO buffer */
#define MFRC522_FLUSH_BUFFER (1 << 7) /* immediately clears the internal FIFO buffer */
/* Section 9.3.1.12: WaterLevelReg register */
#define MFRC522_WATER_LEVEL_MASK (0x3F) /* level for FIFO under- and overflow warning */
/* Section 9.3.1.13: ControlReg register */
#define MFRC522_RX_LAST_BITS_MASK (7 << 0) /* indicates the number of valid bits in the last received byte */
#define MFRC522_TSTART_NOW (1 << 6) /* timer starts immediately */
#define MFRC522_TSTOP_NOW (1 << 7) /* timer stops immediately */
/* Section 9.3.1.14: BitFramingReg register */
#define MFRC522_TX_LAST_BITS_MASK (7 << 0) /* defines the number of bits of the last byte that will be transmitted */
#define MFRC522_RX_ALIGN_MASK (7 << 4) /* used for reception of bit-oriented frames */
#define MFRC522_START_SEND (1 << 7) /* starts the transmission of data */
/* Section 9.3.1.15: CollReg register */
#define MFRC522_COLL_POS_MASK (0x1F) /* shows the bit position of the first detected collision */
#define MFRC522_COLL_POS_NOT_VALID (1 << 5) /* no collision detected or it is out of the range of CollPos[4:0] */
#define MFRC522_VALUES_AFTER_COLL (1 << 7) /* 0 means: all received bits will be cleared after a collision */
/* Section 9.3.2.2: ModeReg register */
#define MFRC522_CRC_PRESET_MASK (0x3) /* defines the preset value for the CalcCRC */
#define MFRC522_CRC_PRESET_0000 (0x0) /* 0000h CRC preset value */
#define MFRC522_CRC_PRESET_6363 (0x1) /* 6363h CRC preset value */
#define MFRC522_CRC_PRESET_A671 (0x2) /* A671h CRC preset value */
#define MFRC522_CRC_PRESET_FFFF (0x3) /* FFFFh CRC preset value */
#define MFRC522_POL_MFIN (1 << 3) /* defines the polarity of pin MFIN */
#define MFRC522_TX_WAIT_RF (1 << 5) /* transmitter can only be started if an RF field is generated */
#define MFRC522_MSB_FIRST (1 << 7) /* CRC coprocessor calculates the CRC with MSB first */
/* Section 9.3.2.3: TxModeReg register */
#define MFRC522_INV_MOD (1 << 3) /* modulation of transmitted data is inverted */
#define MFRC522_TX_SPEED_MASK (7 << 4) /* defines the bit rate during data transmission */
#define MFRC522_TX_106KBD (0 << 4) /* 106 kBd */
#define MFRC522_TX_212KBD (1 << 4) /* 212 kBd */
#define MFRC522_TX_424KBD (2 << 4) /* 424 kBd */
#define MFRC522_TX_848KBD (3 << 4) /* 848 kBd */
/* 4-7 << 4 - reserved */
#define MFRC522_TX_CRC_EN (1 << 7) /* enables CRC generation during data transmission */
/* Section 9.3.2.4: RxModeReg register */
#define MFRC522_RX_MULTIPLE (1 << 2) /* enable to receive more than one data frame, only at 106kBd */
#define MFRC522_RX_NO_ERR (1 << 3) /* ignore invalid data stream error (less than 4 bits received) */
#define MFRC522_RX_SPEED_MASK (7 << 4) /* defines the bit rate during data reception */
#define MFRC522_RX_106KBD (0 << 4) /* 106 kBd */
#define MFRC522_RX_212KBD (1 << 4) /* 212 kBd */
#define MFRC522_RX_424KBD (2 << 4) /* 424 kBd */
#define MFRC522_RX_848KBD (3 << 4) /* 848 kBd */
/* 4-7 << 4 - reserved */
#define MFRC522_RX_CRC_EN (1 << 7) /* enables CRC generation during data reception */
/* Section 9.3.2.5: TxControlReg register */
#define MFRC522_TX1_RF_EN (1 << 0) /* output signal on pin TX1 delivers 13.56MHz */
#define MFRC522_TX2_RF_EN (1 << 1) /* output signal on pin TX2 delivers 13.56MHz */
/* bit 2 - reserved */
#define MFRC522_TX2_CW (1 << 3) /* output signal on pin TX2 delivers (un)modulated 13.56MHz */
#define MFRC522_INV_TX1_RF_OFF (1 << 4) /* output signal on pin TX1 is inverted when driver TX1 is disabled */
#define MFRC522_INV_TX2_RF_OFF (1 << 5) /* output signal on pin TX2 is inverted when driver TX2 is disabled */
#define MFRC522_INV_TX1_RF_ON (1 << 6) /* output signal on pin TX1 is inverted when driver TX1 is enabled */
#define MFRC522_INV_TX2_RF_ON (1 << 7) /* output signal on pin TX2 is inverted when driver TX2 is enabled */
/* Section 9.3.2.6: TxASKReg register */
#define MFRC522_FORCE_100ASK (1 << 6) /* forces a 100% ASK modulation independent of the ModGsPReg setting */
/* Section 9.3.2.7: TxSelReg register */
#define MFRC522_MFOUT_SEL_MASK (0xF) /* selects the input for pin MFOUT */
#define MFRC522_MFOUT_3STATE (0) /* 3-state */
#define MFRC522_MFOUT_LOW (1) /* constant Low */
#define MFRC522_MFOUT_HIGH (2) /* constant High */
#define MFRC522_MFOUT_TEST_BUS (3) /* test bus signal as defined by the TstBusBitSel[2:0] value */
#define MFRC522_MFOUT_INT_ENV (4) /* modulation signal (envelope) from the internal encoder */
#define MFRC522_MFOUT_TX_STREAM (5) /* serial data stream to be transmitted, data stream before Miller encoder */
/* 6 - reserved */
#define MFRC522_MFOUT_RX_STREAM (7) /* serial data stream received, data stream after Manchester decoder */
/* 8-15 - reserved */
#define MFRC522_DRV_SEL_MASK (3 << 4) /* selects the input of drivers TX1 and TX2 */
#define MFRC522_DRV_SEL_3STATE (0 << 4) /* 3-state */
#define MFRC522_DRV_SEL_INT_ENV (1 << 4) /* modulation signal (envelope) from the internal encoder */
#define MFRC522_DVR_SEL_ENV_MFIN (2 << 4) /* modulation signal (envelope) from pin MFIN */
#define MFRC522_DVR_SEL_HIGH (3 << 4) /* High: depends on InvTx1RFOn/InvTx1RFOff and InvTx2RFOn/InvTx2RFOff */
/* Section 9.3.2.8: RxSelReg register */
#define MFRC522_RX_WAIT_MASK (0x3F) /* delay the receiver RxWait bit-clocks after transmission */
#define MFRC522_UART_SEL_MASK (3 << 6) /* selects the input of the contactless UART */
#define MFRC522_UART_LOW (0 << 6) /* constant Low */
#define MFRC522_UART_MANCHESTER (1 << 6) /* Manchester with subcarrier from pin MFIN */
#define MFRC522_UART_INT_MOD (2 << 6) /* modulated signal from the internal analog module, default */
#define MFRC522_UART_NRZ_CODE (3 << 6) /* NRZ coding without subcarrier from pin MFIN */
/* Section 9.3.2.9: RxThresholdReg register */
#define MFRC522_COLL_LEVEL_MASK (7) /* the minimum signal strength to generate a bit-collision */
#define MFRC522_MIN_LEVEL_MASK (0xF << 4) /* the minimum signal strength that will be accepted */
/* Section 9.3.2.10: DemodReg register */
#define MFRC522_TAU_SYNC_MASK (3 << 0) /* changes the time-constant of the internal PLL during burst */
#define MFRC522_TAU_RCV_MASK (3 << 2) /* changes the time-constant of the internal PLL during data reception */
#define MFRC522_TPRESCAL_EVEN (1 << 4) /* defines the Timer Prescaler formula to use */
#define MFRC522_FIX_IQ (1 << 5) /* defines if reception will be fixed at channel I or Q based on AddIQ[1:0] */
#define MFRC522_ADD_IQ_MASK (3 << 6) /* defines the use of I and Q channel during reception */
/* Section 9.3.2.13: MfTxReg register */
#define MFRC522_MF_TX_WAIT_MASK (3 << 0) /* defines the additional response time */
/* Section 9.3.2.14 MfRxReg register */
#define MFRC522_MF_RX_PARITY_DIS (1 << 4 ) /* disable parity bit to transmittion and reception */
/* Section 9.3.2.16: SerialSpeedReg register */
#define MFRC522_BR_T1_MASK (0x1F) /* factor BR_T1 adjusts the transfer speed */
#define MFRC522_BR_T0_MASK (7 << 5) /* factor BR_T0 adjusts the transfer speed */
/* Section 9.3.3.6: RFCfgReg register */
#define MFRC522_RX_GAIN_MASK (0x7 << 4)
#define MFRC522_RX_GAIN_18DB (0x0 << 4)
#define MFRC522_RX_GAIN_23DB (0x1 << 4)
#define MFRC522_RX_GAIN_18DB_2 (0x2 << 4)
#define MFRC522_RX_GAIN_23DB_2 (0x3 << 4)
#define MFRC522_RX_GAIN_33DB (0x4 << 4)
#define MFRC522_RX_GAIN_38DB (0x5 << 4)
#define MFRC522_RX_GAIN_43DB (0x6 << 4)
#define MFRC522_RX_GAIN_48DB (0x7 << 4)
/* MFRC522 TModeReg and TPrescalerReg registers */
#define MFRC522_TPRESCALER_HI_MASK (0xF)
#define MFRC522_TAUTO_RESTART (1 << 4)
#define MFRC522_TGATED_MASK (3 << 5)
#define MFRC522_TGATED_NONGATED (0 << 5) /* non-gated mode */
#define MFRC522_TGATED_MFIN (1 << 5) /* gated by pin MFIN */
#define MFRC522_TGATED_AUX1 (2 << 5) /* gated by pin AUX1 */
#define MFRC522_TAUTO (1 << 7) /* timer starts automatically at the end of the transmission */
/* MFRC522 AutoTestReg register */
#define MFRC522_SELFTEST_MASK (0xF) /* for default operation the self test must be disabled by value 0000b */
#define MFRC522_RFT_MASK (3 << 4) /* reserved for production tests */
#define MFRC522_AMP_RCV (1 << 6) /* non-linear signal processing mode, increase range distance at 106kBd */
#define MFRC522_SELFTEST_EN 9 /* the self test is enabled by value 1001b */
#ifndef CONFIG_MFRC522_SPI_FREQ
# define CONFIG_MFRC522_SPI_FREQ (5000000)
#endif
/****************************************************************************
* Public Types
****************************************************************************/
struct mfrc522_dev_s
{
uint8_t state;
FAR struct spi_dev_s *spi; /* SPI interface */
};
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
bool mfrc522_set_config(struct mfrc522_dev_s *dev, uint8_t flags);
#endif /* __DRIVERS_CONTACTLESS_MFRC522_H */
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