#ifndef _CAN_H
#define _CAN_H

// Initialize the CAN subsystem
void can_init( );

// This is an opaque data type that represents one of the hardware CAN buffers
// In actuality this is a pointer at a group of SFRs, so don't mess with it!
typedef unsigned char CAN_BUFFER;

// Get a handle to a free CAN transmission buffer
CAN_BUFFER can_get_tx_buf( );
// Set a standard address for a buffer
void can_set_address_std(CAN_BUFFER buf, unsigned long addr);
// Set an extended address into a buffer
void can_set_address_ext(CAN_BUFFER buf, unsigned long addr);
// Set the buffer's data
void can_set_buffer_data(
	CAN_BUFFER buf, unsigned char *data_in, unsigned char length
);
// Transmit Data Frame
void can_send_tx_buf(CAN_BUFFER buf);


// Return a buffer with the next message in the receive queue
CAN_BUFFER can_get_rx_msg( );

// Get the address from a CAN_BUFFER
unsigned long can_get_address(CAN_BUFFER buf);

// Get the DLC from a CAN_BUFFER
unsigned char can_get_dlc(CAN_BUFFER buf);

// Get a data byte from a CAN_BUFFER
unsigned char can_get_data_byte(CAN_BUFFER buf, unsigned char index);

// Free the buffer for a new message
void can_free_rx_buf(CAN_BUFFER buf);

// Transmit Remote Frame
void can_send_rtr(CAN_BUFFER buf);

#endif