Driver for the Microchip MCP2515 can controller. More...

Detailed Description

Driver for the Microchip MCP2515 can controller.

Definition of the MCP2515 CAN controller driver.

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

Definition in file mcp2515.h.

#include "mcp2515_defines.h"
#include "candev_mcp2515.h"

Include dependency graph for mcp2515.h:

Go to the source code of this file.

#define	MCP2515_WKUP_SRC_INTERNAL 1
	Wake up source.

enum	mcp2515_mode { MODE_NORMAL = MCP2515_CANSTAT_OPMOD_NORMAL, MODE_SLEEP = MCP2515_CANSTAT_OPMOD_SLEEP, MODE_LOOPBACK = MCP2515_CANSTAT_OPMOD_LOOPBACK, MODE_LISTEN_ONLY = MCP2515_CANSTAT_OPMOD_LISTEN_ONLY, MODE_CONFIG = MCP2515_CANSTAT_OPMOD_CONFIGURATION, MODE_UNKNOWN = -1 }
	MCP2515 mode.

enum	mcp2515_interrupt { INT_RX0 = MCP2515_CANINTF_RX0IF, INT_RX1 = MCP2515_CANINTF_RX1IF, INT_TX0 = MCP2515_CANINTF_TX0IF, INT_TX1 = MCP2515_CANINTF_TX1IF, INT_TX2 = MCP2515_CANINTF_TX2IF, INT_ERROR = MCP2515_CANINTF_ERRIF, INT_WAKEUP = MCP2515_CANINTF_WAKIF, INT_MESSAGE_ERROR = MCP2515_CANINTF_MERRF }
	MCP2515 interrupt.

enum	mcp2515_error { ERR_WARNING = MCP2515_EFLG_EWARN, ERR_RX_WARNING = MCP2515_EFLG_RXWAR, ERR_TX_WARNING = MCP2515_EFLG_TXWAR, ERR_RX_PASSIVE = MCP2515_EFLG_RXEP, ERR_TX_PASSIVE = MCP2515_EFLG_TXEP, ERR_TX_BUS_OFF = MCP2515_EFLG_TXBO, ERR_RX_0_OVERFLOW = MCP2515_EFLG_RX0OVR, ERR_RX_1_OVERFLOW = MCP2515_EFLG_RX1OVR }
	MCP2515 error.

int	mcp2515_init (candev_mcp2515_t dev, void(irq_cb)(void *))
	Initialize pins and SPI interface. More...

void	mcp2515_reset (candev_mcp2515_t *dev)
	Reset MCP2515 device with dedicated pin. More...

int	mcp2515_init_irqs (candev_mcp2515_t *dev)
	Initialize MCP2515 interrupts. More...

int	mcp2515_send (candev_mcp2515_t dev, const struct can_frame frame, int mailbox)
	Send frame through the corresponding tx `mailbox`. More...

int	mcp2515_receive (candev_mcp2515_t dev, struct can_frame frame, int mailbox)
	Receive frame from the corresponding rx `mailbox`. More...

int	mcp2515_abort (candev_mcp2515_t *dev, int mailbox)
	Abort communication. More...

enum mcp2515_mode	mcp2515_get_mode (candev_mcp2515_t *dev)
	Get MCP2515 mode of operation. More...

enum mcp2515_mode	mcp2515_set_mode (candev_mcp2515_t *dev, enum mcp2515_mode mode)
	Set MCP2515 mode of operation. More...

void	mcp2515_wake_up (candev_mcp2515_t *dev)
	Wake up MCP2515. More...

enum mcp2515_interrupt	mcp2515_get_irq (candev_mcp2515_t *dev)
	Get MCP2515 interrupt type. More...

int	mcp2515_clear_irq (candev_mcp2515_t *dev, enum mcp2515_interrupt irq)
	Clear MCP2515 interrupt. More...

int	mcp2515_tx_err_occurred (candev_mcp2515_t *dev, int mailbox)
	Get if an tx error occurred on MCP2515. More...

int	mcp2515_configure_bittiming (candev_mcp2515_t *dev)
	Configure the bit timing of the MCP2515. More...

uint8_t	mcp2515_get_errors (candev_mcp2515_t *dev)
	Get the error flags. More...

int	mcp2515_set_filter (candev_mcp2515_t *dev, int filter_id, uint32_t filter)
	Set the @ filter_id to the position in the mailbox. More...

int	mcp2515_set_mask (candev_mcp2515_t *dev, int mailbox, uint32_t mask)
	Set the @ mask to the mailbox. More...

Function Documentation

◆ mcp2515_abort()

int mcp2515_abort	(	candev_mcp2515_t *	dev,
		int	mailbox
	)

Abort communication.

Parameters

[in]	dev	device descriptor
[in]	mailbox	mailbox

Returns: 0 on success; <0 on error

◆ mcp2515_clear_irq()

int mcp2515_clear_irq	(	candev_mcp2515_t *	dev,
		enum mcp2515_interrupt	irq
	)

Clear MCP2515 interrupt.

Parameters

[in]	dev	device descriptor
[in]	irq	interrupt to clear

Returns: 0 on success; <0 on error

◆ mcp2515_configure_bittiming()

int mcp2515_configure_bittiming ( candev_mcp2515_t * dev )

Configure the bit timing of the MCP2515.

The information about the bit timing should be contained in dev descriptor.

Parameters

[in] dev device descriptor

Returns: 0 on success; <0 on error

◆ mcp2515_get_errors()

uint8_t mcp2515_get_errors ( candev_mcp2515_t * dev )

Get the error flags.

Parameters

[in] dev device descriptor

Returns: EFLG error flags

◆ mcp2515_get_irq()

enum mcp2515_interrupt mcp2515_get_irq ( candev_mcp2515_t * dev )

Get MCP2515 interrupt type.

Parameters

[in] dev device descriptor

Returns: mcp2515_interrupt enum

◆ mcp2515_get_mode()

enum mcp2515_mode mcp2515_get_mode ( candev_mcp2515_t * dev )

Get MCP2515 mode of operation.

Parameters

[in] dev device descriptor

Returns: mcp2515_mode enum

◆ mcp2515_init()

int mcp2515_init	(	candev_mcp2515_t *	dev,
		void()(void )	irq_cb
	)

Initialize pins and SPI interface.

The device descriptor contains all information related to pins and SPI interface. This function initialize all corresponding fields and relies the irq_cb callback function to the pin interruption. The pin interruption should be configured in the device descriptor.

Parameters

[out]	dev	device descriptor
[in]	irq_cb	callback function called when an interrupt is raised from the MCP2515. The MCP2515 makes the interruption through the interruption pin.

Returns: 0 on success; <0 on error

◆ mcp2515_init_irqs()

int mcp2515_init_irqs ( candev_mcp2515_t * dev )

Initialize MCP2515 interrupts.

Parameters

[in] dev device descriptor

Returns: 0 on success; <0 on error

◆ mcp2515_receive()

int mcp2515_receive	(	candev_mcp2515_t *	dev,
		struct can_frame *	frame,
		int	mailbox
	)

Receive frame from the corresponding rx mailbox.

Parameters

[in]	dev	device descriptor
[out]	frame	the receive frame
[in]	mailbox	rx mailbox

Returns: 0 on success; <0 on error

◆ mcp2515_reset()

void mcp2515_reset ( candev_mcp2515_t * dev )

Reset MCP2515 device with dedicated pin.

The MCP2515 device is reset by toggling the rst pin.

Parameters

[in] dev device descriptor

◆ mcp2515_send()

int mcp2515_send	(	candev_mcp2515_t *	dev,
		const struct can_frame *	frame,
		int	mailbox
	)

Send frame through the corresponding tx mailbox.

Parameters

[in]	dev	device descriptor
[in]	frame	the frame to send
[in]	mailbox	tx mailbox

Returns: 0 on success; <0 on error

◆ mcp2515_set_filter()

int mcp2515_set_filter	(	candev_mcp2515_t *	dev,
		int	filter_id,
		uint32_t	filter
	)

Set the @ filter_id to the position in the mailbox.

filter_id corresponds to the position in the MCP2515 mailbox as follow:

[0; 1]: mailbox RXB0
[2; 5]: mailbox RXB1

The MCP2515 managed 6 acceptance filters in 2 rx mailboxes:

MB0 contains 2 acceptance filters in relation with 1 acceptance mask
MB1 contains 4 acceptance filters in relation with 1 acceptance mask
```
    MB0          MB1
  +------+    +------+
```
mask 0 | RXM0 | | RXM1 | mask 1 +======+ +======+ filter 0 | RXF0 | | RXF2 | filter 2 +---—+ +---—+ filter 1 | RXF1 | | RXF3 | filter 3 +---—+ +---—+ | RXF4 | filter 4 +---—+ | RXF5 | filter 5 +---—+

Parameters

[in]	dev	device descriptor
[in]	filter_id	filter identifier in the MCP2515 mailbox
[in]	filter	acceptance filter can identifier

Returns: 0 on success; <0 on error

◆ mcp2515_set_mask()

int mcp2515_set_mask	(	candev_mcp2515_t *	dev,
		int	mailbox,
		uint32_t	mask
	)

Set the @ mask to the mailbox.

The MCP2515 managed 6 acceptance filters in 2 rx mailboxes:

MB0 contains 2 acceptance filters in relation with 1 acceptance mask
MB1 contains 4 acceptance filters in relation with 1 acceptance mask
```
    MB0          MB1
  +------+    +------+
```
mask 0 | RXM0 | | RXM1 | mask 1 +======+ +======+ filter 0 | RXF0 | | RXF2 | filter 2 +---—+ +---—+ filter 1 | RXF1 | | RXF3 | filter 3 +---—+ +---—+ | RXF4 | filter 4 +---—+ | RXF5 | filter 5 +---—+

Parameters

[in]	dev	device descriptor
[in]	mailbox	rx mailbox
[in]	mask	acceptance mask

Returns: 0 on success; <0 on error

◆ mcp2515_set_mode()

enum mcp2515_mode mcp2515_set_mode	(	candev_mcp2515_t *	dev,
		enum mcp2515_mode	mode
	)

Set MCP2515 mode of operation.

Parameters

[in]	dev	device descriptor
[in]	mode	mode of operation to set

Returns: The mode actually set

◆ mcp2515_tx_err_occurred()

int mcp2515_tx_err_occurred	(	candev_mcp2515_t *	dev,
		int	mailbox
	)

Get if an tx error occurred on MCP2515.

Parameters

[in]	dev	device descriptor
[in]	mailbox	tx mailbox

Returns: 0 on success; <0 on error

◆ mcp2515_wake_up()

void mcp2515_wake_up ( candev_mcp2515_t * dev )

Wake up MCP2515.

Parameters

[in] dev device descriptor