pkt.h File Reference

CAN memory allocation module. More...

Detailed Description

CAN memory allocation module.

Author

Vincent Dupont vince.nosp@m.nt@o.nosp@m.takey.nosp@m.s.co.nosp@m.m

Toon Stegen toon..nosp@m.steg.nosp@m.en@al.nosp@m.tran.nosp@m..com

Definition in file pkt.h.

#include <stdatomic.h>
#include "can/common.h"
#include "can/can.h"
#include "msg.h"

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Data Structures
struct	can_pkt_t
	A CAN packet. More...
void	can_pkt_init (void)
	Initialize the CAN packet module.
can_pkt_t *	can_pkt_alloc_tx (int ifnum, const struct can_frame *frame, kernel_pid_t tx_pid)
	Allocate a CAN packet to transmit.
can_pkt_t *	can_pkt_alloc_rx (int ifnum, const struct can_frame *frame)
	Allocate an incoming CAN packet.
can_pkt_t *	can_pkt_alloc_mbox_tx (int ifnum, const struct can_frame *frame, mbox_t *mbox)
	Allocate a CAN packet for a mbox to transmit.
void	can_pkt_free (can_pkt_t *pkt)
	Free a CAN packet.
can_rx_data_t *	can_pkt_alloc_rx_data (void *data, size_t len, void *arg)
	Allocate a can_rx_data_t and initialize it with gieven parameters.
void	can_pkt_free_rx_data (can_rx_data_t *data)
	Free rx data previously allocated by can_pkt_alloc_rx_data()
void *	can_pkt_buf_alloc (size_t size)
	Allocate size bytes and return the pointer.
void	can_pkt_buf_free (void *data, size_t size)
	Free the data allocated by can_pkt_buf_alloc()

Function Documentation

can_pkt_alloc_mbox_tx()

can_pkt_t * can_pkt_alloc_mbox_tx	(	int	ifnum,
		const struct can_frame *	frame,
		mbox_t *	mbox
	)

Allocate a CAN packet for a mbox to transmit.

This function allocates a CAN packet and associate it to the ifnum and mbox. The provided frame is copied into the CAN packet and a unique handle is set.

Parameters

[in]	ifnum	the interface number
[in]	frame	the frame to copy
[in]	mbox	the pointer to the sender's mbox

Returns

an allocated CAN packet, NULL if an error occurred

can_pkt_alloc_rx()

can_pkt_t * can_pkt_alloc_rx	(	int	ifnum,
		const struct can_frame *	frame
	)

Allocate an incoming CAN packet.

Parameters

[in]	ifnum	the interface number
[in]	frame	the received frame

Returns

an allocated CAN packet, NULL if an error occurred

can_pkt_alloc_rx_data()

can_rx_data_t * can_pkt_alloc_rx_data	(	void *	data,
		size_t	len,
		void *	arg
	)

Allocate a can_rx_data_t and initialize it with gieven parameters.

This is used to allocate a return value to the upper layer

Parameters

[in]	data	data which will be returned
[in]	len	length of data
[in]	arg	optional argument for the upper layer

Returns

a can_rx_data_t pointer, NULL if out of memory

can_pkt_alloc_tx()

can_pkt_t * can_pkt_alloc_tx	(	int	ifnum,
		const struct can_frame *	frame,
		kernel_pid_t	tx_pid
	)

Allocate a CAN packet to transmit.

This function allocates a CAN packet and associates it to the ifnum and tx_pid. The provided frame is copied into the CAN packet and a unique handle is set.

Parameters

[in]	ifnum	the interface number
[in]	frame	the frame to copy
[in]	tx_pid	the pid of the sender's device thread

Returns

an allocated CAN packet, NULL if an error occurred

can_pkt_buf_alloc()

void * can_pkt_buf_alloc

(

size_t

size

)

Allocate size bytes and return the pointer.

This function has been copied from gnrc_pktbuf_static

Parameters

[in]

size

the number of bytes to allocate

Returns

the pointer to thje allocated data, NULL if out of memory

can_pkt_buf_free()

void can_pkt_buf_free	(	void *	data,
		size_t	size
	)

Free the data allocated by can_pkt_buf_alloc()

Parameters

[in]	data	the pointer to free
[in]	size	the size of the data to free

can_pkt_free()

void can_pkt_free

(

can_pkt_t *

pkt

)

Free a CAN packet.

Parameters

[in]

pkt

the packet to free, it must be a pointer returned by can_pkt_alloc_tx or can_pkt_alloc_rx

can_pkt_free_rx_data()

void can_pkt_free_rx_data

(

can_rx_data_t *

data

)

Free rx data previously allocated by can_pkt_alloc_rx_data()

Parameters

[in]

data

the pointer to free

can_pkt_init()

void can_pkt_init

(

void

)

Initialize the CAN packet module.

This must be called by the DLL to initialize the module