mcp_2515.h

#ifndef	MCP2515_H
#define	MCP2515_H

typedef struct 
{
    uint16_t  id;
    uint8_t   rtr;
    uint8_t   length;
    uint8_t   data[8];
    uint8_t	  used;
} CANMesg_t;


// CAN Bitrate 125 kbps
#define R_125_CNF1  (1<<BRP2)|(1<<BRP1)|(1<<BRP0)
#define R_125_CNF2  (1<<BTLMODE)|(1<<PHSEG11)
#define R_125_CNF3  (1<<PHSEG21)

// CAN Bitrate 250 kbps
#define R_250_CNF1  (1<<BRP1)|(1<<BRP0)
#define R_250_CNF2  (1<<BTLMODE)|(1<<PHSEG11)
#define R_250_CNF3  (1<<PHSEG21)

// CAN Bitrate 500 kbps
#define R_500_CNF1  (1<<BRP0)
#define R_500_CNF2  (1<<BTLMODE)|(1<<PHSEG11)   
#define R_500_CNF3  (1<<PHSEG21)

// CAN Bitrate 1 Mbps
#define R_1000_CNF1  0
#define R_1000_CNF2  (1<<BTLMODE)|(1<<PHSEG11)
#define R_1000_CNF3  (1<<PHSEG21)


#define DDR_CS      DDRB
#define PORT_CS     PORTB
#define DDR_SPI     DDRB
#define PORT_SPI    PORTB

// SPARKFUN shield PIN definitions (shield=1)
#define SPARKFUN_CS        2    // <- uses PIN 2 for MCP2515 CS
#define SPARKFUN_MISO      4
#define SPARKFUN_MOSI      3
#define SPARKFUN_SCK       5
#define SPARKFUN_SS        4
// SEEDSTUDIO shield PIN definitions (shield=2)
#define SEEDSTUDIO_CS      1    // <- uses PIN 1 for MCP2515 CS
#define SEEDSTUDIO_MISO    4
#define SEEDSTUDIO_MOSI    3
#define SEEDSTUDIO_SCK     5
#define SEEDSTUDIO_SS      2	


#define SPI_PORT    PORTB
#define SPI_PIN     PINB
#define SPI_DDR     DDRB  // direction

#define SPI_RESET		0xC0
#define	SPI_READ		0x03
#define	SPI_READ_RX		0x90
#define	SPI_WRITE		0x02
#define	SPI_WRITE_TX	0x40
#define	SPI_RTS			0x80
#define SPI_READ_STATUS	0xA0
#define	SPI_RX_STATUS	0xB0
#define	SPI_BIT_MODIFY	0x05

#define RXF0SIDH	0x00
#define RXF0SIDL	0x01
#define RXF0EID8	0x02
#define RXF0EID0	0x03
#define RXF1SIDH	0x04
#define RXF1SIDL	0x05
#define RXF1EID8	0x06
#define RXF1EID0	0x07
#define RXF2SIDH	0x08
#define RXF2SIDL	0x09
#define RXF2EID8	0x0A
#define RXF2EID0	0x0B
#define BFPCTRL		0x0C
#define TXRTSCTRL	0x0D
#define CANSTAT		0x0E
#define CANCTRL		0x0F

#define RXF3SIDH	0x10
#define RXF3SIDL	0x11
#define RXF3EID8	0x12
#define RXF3EID0	0x13
#define RXF4SIDH	0x14
#define RXF4SIDL	0x15
#define RXF4EID8	0x16
#define RXF4EID0	0x17
#define RXF5SIDH	0x18
#define RXF5SIDL	0x19
#define RXF5EID8	0x1A
#define RXF5EID0	0x1B
#define TEC			0x1C
#define REC         0x1D

#define RXM0SIDH	0x20
#define RXM0SIDL	0x21
#define RXM0EID8	0x22
#define RXM0EID0	0x23
#define RXM1SIDH	0x24
#define RXM1SIDL	0x25
#define RXM1EID8	0x26
#define RXM1EID0	0x27
#define CNF3		0x28
#define CNF2		0x29
#define CNF1		0x2A
#define CANINTE		0x2B
#define CANINTF		0x2C
#define EFLG		0x2D

#define TXB0CTRL	0x30
#define TXB0SIDH	0x31
#define TXB0SIDL	0x32
#define TXB0EID8	0x33
#define TXB0EID0	0x34
#define TXB0DLC		0x35
#define TXB0D0		0x36
#define TXB0D1		0x37
#define TXB0D2		0x38
#define TXB0D3		0x39
#define TXB0D4		0x3A
#define TXB0D5		0x3B
#define TXB0D6		0x3C
#define TXB0D7		0x3D

#define TXB1CTRL	0x40
#define TXB1SIDH	0x41
#define TXB1SIDL	0x42
#define TXB1EID8	0x43
#define TXB1EID0	0x44
#define TXB1DLC		0x45
#define TXB1D0		0x46
#define TXB1D1		0x47
#define TXB1D2		0x48
#define TXB1D3		0x49
#define TXB1D4		0x4A
#define TXB1D5		0x4B
#define TXB1D6		0x4C
#define TXB1D7		0x4D

#define TXB2CTRL	0x50
#define TXB2SIDH	0x51
#define TXB2SIDL	0x52
#define TXB2EID8	0x53
#define TXB2EID0	0x54
#define TXB2DLC		0x55
#define TXB2D0		0x56
#define TXB2D1		0x57
#define TXB2D2		0x58
#define TXB2D3		0x59
#define TXB2D4		0x5A
#define TXB2D5		0x5B
#define TXB2D6		0x5C
#define TXB2D7		0x5D

#define RXB0CTRL	0x60
#define RXB0SIDH	0x61
#define RXB0SIDL	0x62
#define RXB0EID8	0x63
#define RXB0EID0	0x64
#define RXB0DLC		0x65
#define RXB0D0		0x66
#define RXB0D1		0x67
#define RXB0D2		0x68
#define RXB0D3		0x69
#define RXB0D4		0x6A
#define RXB0D5		0x6B
#define RXB0D6		0x6C
#define RXB0D7		0x6D

#define RXB1CTRL	0x70
#define RXB1SIDH	0x71
#define RXB1SIDL	0x72
#define RXB1EID8	0x73
#define RXB1EID0	0x74
#define RXB1DLC		0x75
#define RXB1D0		0x76
#define RXB1D1		0x77
#define RXB1D2		0x78
#define RXB1D3		0x79
#define RXB1D4		0x7A
#define RXB1D5		0x7B
#define RXB1D6		0x7C
#define RXB1D7		0x7D


/** \brief	BFPCTRL */
#define B1BFS		5
#define B0BFS		4
#define B1BFE		3
#define B0BFE		2
#define B1BFM		1
#define B0BFM		0

/** \brief	TXRTSCTRL */
#define B2RTS		5
#define B1RTS		4
#define B0RTS		3
#define B2RTSM		2
#define B1RTSM		1
#define B0RTSM		0

/** \brief	CANSTAT */
#define OPMOD2		7
#define OPMOD1		6
#define OPMOD0		5
#define ICOD2		3
#define ICOD1		2
#define ICOD0		1

/** \brief	CANCTRL */
#define REQOP2		7
#define REQOP1		6
#define REQOP0		5
#define ABAT		4
#define CLKEN		2
#define CLKPRE1		1
#define CLKPRE0		0

/** \brief	CNF3 */
#define WAKFIL		6
#define PHSEG22		2
#define PHSEG21		1
#define PHSEG20		0

/** \brief	CNF2 */
#define BTLMODE		7
#define SAM			6
#define PHSEG12		5
#define PHSEG11		4
#define PHSEG10		3
#define PHSEG2		2
#define PHSEG1		1
#define PHSEG0		0

/** \brief	CNF1 */
#define SJW1		7
#define SJW0		6
#define BRP5		5
#define BRP4		4
#define BRP3		3
#define BRP2		2
#define BRP1		1
#define BRP0		0

/** \brief	CANINTE */
#define MERRE		7
#define WAKIE		6
#define ERRIE		5
#define TX2IE		4
#define TX1IE		3
#define TX0IE		2
#define RX1IE		1
#define RX0IE		0

/** \brief	 CANINTF */
#define MERRF		7
#define WAKIF		6
#define ERRIF		5
#define TX2IF		4
#define TX1IF		3
#define TX0IF		2
#define RX1IF		1
#define RX0IF		0

/** \brief	EFLG */
#define RX1OVR		7
#define RX0OVR		6
#define TXB0		5
#define TXEP		4
#define RXEP		3
#define TXWAR		2
#define RXWAR		1
#define EWARN		0

/** \brief	TXBnCTRL (n = 0, 1, 2) */
#define ABTF		6
#define MLOA		5
#define TXERR		4
#define TXREQ		3
#define TXP1		1
#define TXP0		0

/** \brief	RXB0CTRL */
#define RXM1		6
#define RXM0		5
#define RXRTR		3
#define BUKT		2
#define BUKT1		1
#define FILHIT0		0

/** \brief	TXBnSIDL (n = 0, 1) */
#define	EXIDE		3

/**
 * \brief	RXB1CTRL
 * \see		RXM1, RXM0, RXRTR  FILHIT0 already defined
 */
#define FILHIT2		2
#define FILHIT1		1

/** \brief	RXBnSIDL (n = 0, 1) */
#define	SRR			4
#define	IDE			3

/**
 * \brief	RXBnDLC (n = 0, 1)
 * \see		TXBnDLC (same Bits)
 */
#define	RTR			6
#define	DLC3		3
#define	DLC2		2
#define	DLC1		1
#define DLC0		0

void 	mcp2515_init(uint16_t speed);
void 	mcp2515_write_register( uint8_t adress, uint8_t data);
uint8_t mcp2515_read_register(uint8_t adress);
void 	mcp2515_bit_modify(uint8_t adress, uint8_t mask, uint8_t data);
uint8_t mcp2515_read_status(uint8_t type);
uint8_t mcp2515_send_message(CANMesg_t *message);

#endif	// MCP2515_H